1.. 2 ------------------------------------------------------------------- 3 NOTE: This file is automatically generated by running clang-tblgen 4 -gen-opt-docs. Do not edit this file by hand!! 5 ------------------------------------------------------------------- 6 7===================================== 8Clang command line argument reference 9===================================== 10.. contents:: 11 :local: 12 13Introduction 14============ 15 16This page lists the command line arguments currently supported by the 17GCC-compatible ``clang`` and ``clang++`` drivers. 18 19 20.. program:: clang 21.. option:: -B<dir>, --prefix <arg>, --prefix=<arg> 22 23Add <dir> to search path for binaries and object files used implicitly 24 25.. option:: -F<arg> 26 27Add directory to framework include search path 28 29.. option:: -ObjC 30 31Treat source input files as Objective-C inputs 32 33.. program:: clang1 34.. option:: -ObjC++ 35.. program:: clang 36 37Treat source input files as Objective-C++ inputs 38 39.. option:: -Qn, -fno-ident 40 41Do not emit metadata containing compiler name and version 42 43.. option:: -Qunused-arguments 44 45Don't emit warning for unused driver arguments 46 47.. option:: -Qy, -fident 48 49Emit metadata containing compiler name and version 50 51.. option:: -Wa,<arg>,<arg2>... 52 53Pass the comma separated arguments in <arg> to the assembler 54 55.. option:: -Wlarge-by-value-copy=<arg> 56 57.. option:: -Xarch\_<arg1> <arg2> 58 59.. program:: clang1 60.. option:: -Xarch\_device <arg> 61.. program:: clang 62 63Pass <arg> to the CUDA/HIP device compilation 64 65.. program:: clang2 66.. option:: -Xarch\_host <arg> 67.. program:: clang 68 69Pass <arg> to the CUDA/HIP host compilation 70 71.. option:: -Xcuda-fatbinary <arg> 72 73Pass <arg> to fatbinary invocation 74 75.. option:: -Xcuda-ptxas <arg> 76 77Pass <arg> to the ptxas assembler 78 79.. option:: -Xopenmp-target <arg> 80 81Pass <arg> to the target offloading toolchain. 82 83.. program:: clang1 84.. option:: -Xopenmp-target=<triple> <arg> 85.. program:: clang 86 87Pass <arg> to the target offloading toolchain identified by <triple>. 88 89.. option:: -Z<arg> 90 91.. option:: -a<arg>, --profile-blocks 92 93.. option:: -all\_load 94 95.. option:: -allowable\_client <arg> 96 97.. option:: --analyze 98 99Run the static analyzer 100 101.. option:: --analyzer-no-default-checks 102 103.. option:: --analyzer-output<arg> 104 105Static analyzer report output format (html\|plist\|plist-multi-file\|plist-html\|sarif\|text). 106 107.. option:: -ansi, --ansi 108 109.. option:: -arch <arg> 110 111.. program:: clang1 112.. option:: -arch\_errors\_fatal 113.. program:: clang 114 115.. program:: clang2 116.. option:: -arch\_only <arg> 117.. program:: clang 118 119.. option:: -arcmt-migrate-emit-errors 120 121Emit ARC errors even if the migrator can fix them 122 123.. option:: -arcmt-migrate-report-output <arg> 124 125Output path for the plist report 126 127.. option:: --autocomplete=<arg> 128 129.. option:: -bind\_at\_load 130 131.. option:: -bundle 132 133.. program:: clang1 134.. option:: -bundle\_loader <arg> 135.. program:: clang 136 137.. option:: -client\_name<arg> 138 139.. option:: -compatibility\_version<arg> 140 141.. option:: --config <arg> 142 143Specifies configuration file 144 145.. option:: --constant-cfstrings 146 147.. option:: --cuda-compile-host-device 148 149Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. 150 151.. option:: --cuda-device-only 152 153Compile CUDA code for device only 154 155.. option:: --cuda-host-only 156 157Compile CUDA code for host only. Has no effect on non-CUDA compilations. 158 159.. option:: --cuda-include-ptx=<arg>, --no-cuda-include-ptx=<arg> 160 161Include PTX for the following GPU architecture (e.g. sm\_35) or 'all'. May be specified more than once. 162 163.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug 164 165Enable device-side debug info generation. Disables ptxas optimizations. 166 167.. option:: -current\_version<arg> 168 169.. option:: -dead\_strip 170 171.. option:: -dependency-dot <arg> 172 173Filename to write DOT-formatted header dependencies to 174 175.. option:: -dependency-file <arg> 176 177Filename (or -) to write dependency output to 178 179.. option:: -dsym-dir<dir> 180 181Directory to output dSYM's (if any) to 182 183.. option:: -dumpmachine 184 185.. option:: -dumpversion 186 187.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 188 189.. option:: -dylib\_file <arg> 190 191.. option:: -dylinker 192 193.. program:: clang1 194.. option:: -dylinker\_install\_name<arg> 195.. program:: clang 196 197.. option:: -dynamic 198 199.. option:: -dynamiclib 200 201.. option:: -emit-ast 202 203Emit Clang AST files for source inputs 204 205.. option:: --emit-static-lib 206 207Enable linker job to emit a static library. 208 209.. option:: -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 210 211Trivial automatic variable initialization to zero is only here for benchmarks, it'll eventually be removed, and I'm OK with that because I'm only using it to benchmark 212 213.. option:: -exported\_symbols\_list <arg> 214 215.. option:: -faligned-new=<arg> 216 217.. option:: -fcuda-flush-denormals-to-zero, -fno-cuda-flush-denormals-to-zero 218 219Flush denormal floating point values to zero in CUDA device mode. 220 221.. option:: -ffixed-r19 222 223Reserve register r19 (Hexagon only) 224 225.. option:: -fheinous-gnu-extensions 226 227.. option:: -flat\_namespace 228 229.. option:: -fopenmp-targets=<arg1>,<arg2>... 230 231Specify comma-separated list of triples OpenMP offloading targets to be supported 232 233.. option:: -force\_cpusubtype\_ALL 234 235.. program:: clang1 236.. option:: -force\_flat\_namespace 237.. program:: clang 238 239.. program:: clang2 240.. option:: -force\_load <arg> 241.. program:: clang 242 243.. option:: -framework <arg> 244 245.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 246 247Add -rpath with architecture-specific resource directory to the linker flags 248 249.. option:: -fsanitize-system-blacklist=<arg> 250 251Path to system blacklist file for sanitizers 252 253.. option:: -fsystem-module 254 255Build this module as a system module. Only used with -emit-module 256 257.. option:: --gcc-toolchain=<arg>, -gcc-toolchain <arg> 258 259Use the gcc toolchain at the given directory 260 261.. option:: -gcodeview 262 263Generate CodeView debug information 264 265.. option:: -gcodeview-ghash, -gno-codeview-ghash 266 267Emit type record hashes in a .debug$H section 268 269.. option:: -ginline-line-tables, -gno-inline-line-tables 270 271.. option:: --gpu-instrument-lib=<arg> 272 273Instrument device library for HIP, which is a LLVM bitcode containing \_\_cyg\_profile\_func\_enter and \_\_cyg\_profile\_func\_exit 274 275.. option:: --gpu-max-threads-per-block=<arg> 276 277Default max threads per block for kernel launch bounds for HIP 278 279.. option:: -headerpad\_max\_install\_names<arg> 280 281.. option:: -help, --help 282 283Display available options 284 285.. option:: --help-hidden 286 287Display help for hidden options 288 289.. option:: --hip-link 290 291Link clang-offload-bundler bundles for HIP 292 293.. option:: --hip-version=<arg> 294 295HIP version in the format of major.minor.patch 296 297.. option:: -ibuiltininc 298 299Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it 300 301.. option:: -image\_base <arg> 302 303.. option:: -index-header-map 304 305Make the next included directory (-I or -F) an indexer header map 306 307.. option:: -init <arg> 308 309.. option:: -install\_name <arg> 310 311.. option:: -interface-stub-version=<arg> 312 313.. option:: -keep\_private\_externs 314 315.. option:: -lazy\_framework <arg> 316 317.. program:: clang1 318.. option:: -lazy\_library <arg> 319.. program:: clang 320 321.. option:: -mbig-endian, -EB 322 323.. option:: -mbranch-protection=<arg> 324 325Enforce targets of indirect branches and function returns 326 327.. option:: -mharden-sls=<arg> 328 329Select straight-line speculation hardening scope 330 331.. option:: --migrate 332 333Run the migrator 334 335.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 336 337.. option:: -mlinker-version=<arg> 338 339.. option:: -mlittle-endian, -EL 340 341.. option:: -mllvm <arg> 342 343Additional arguments to forward to LLVM's option processing 344 345.. option:: -module-dependency-dir <arg> 346 347Directory to dump module dependencies to 348 349.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 350 351.. option:: -multi\_module 352 353.. option:: -multiply\_defined <arg> 354 355.. program:: clang1 356.. option:: -multiply\_defined\_unused <arg> 357.. program:: clang 358 359.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 360 361.. option:: --no-cuda-version-check 362 363Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 364 365.. option:: -no-integrated-cpp, --no-integrated-cpp 366 367.. option:: -no\_dead\_strip\_inits\_and\_terms 368 369.. option:: -nobuiltininc 370 371Disable builtin #include directories 372 373.. option:: -nodefaultlibs 374 375.. option:: -nofixprebinding 376 377.. option:: -nogpuinc, -nocudainc 378 379.. option:: -nogpulib, -nocudalib 380 381Do not link device library for CUDA/HIP device compilation 382 383.. option:: -nolibc 384 385.. option:: -nomultidefs 386 387.. option:: -nopie, -no-pie 388 389.. option:: -noprebind 390 391.. option:: -noprofilelib 392 393.. option:: -noseglinkedit 394 395.. option:: -nostdinc, --no-standard-includes 396 397.. program:: clang1 398.. option:: -nostdinc++ 399.. program:: clang 400 401Disable standard #include directories for the C++ standard library 402 403.. option:: -nostdlib++ 404 405.. option:: -nostdlibinc 406 407.. option:: -o<file>, --output <arg>, --output=<arg> 408 409Write output to <file> 410 411.. option:: -objcmt-atomic-property 412 413Make migration to 'atomic' properties 414 415.. option:: -objcmt-migrate-all 416 417Enable migration to modern ObjC 418 419.. option:: -objcmt-migrate-annotation 420 421Enable migration to property and method annotations 422 423.. option:: -objcmt-migrate-designated-init 424 425Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 426 427.. option:: -objcmt-migrate-instancetype 428 429Enable migration to infer instancetype for method result type 430 431.. option:: -objcmt-migrate-literals 432 433Enable migration to modern ObjC literals 434 435.. option:: -objcmt-migrate-ns-macros 436 437Enable migration to NS\_ENUM/NS\_OPTIONS macros 438 439.. option:: -objcmt-migrate-property 440 441Enable migration to modern ObjC property 442 443.. option:: -objcmt-migrate-property-dot-syntax 444 445Enable migration of setter/getter messages to property-dot syntax 446 447.. option:: -objcmt-migrate-protocol-conformance 448 449Enable migration to add protocol conformance on classes 450 451.. option:: -objcmt-migrate-readonly-property 452 453Enable migration to modern ObjC readonly property 454 455.. option:: -objcmt-migrate-readwrite-property 456 457Enable migration to modern ObjC readwrite property 458 459.. option:: -objcmt-migrate-subscripting 460 461Enable migration to modern ObjC subscripting 462 463.. option:: -objcmt-ns-nonatomic-iosonly 464 465Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 466 467.. option:: -objcmt-returns-innerpointer-property 468 469Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 470 471.. option:: -objcmt-whitelist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg> 472 473Only modify files with a filename contained in the provided directory path 474 475.. option:: -object 476 477.. option:: --offload-arch=<arg>, --cuda-gpu-arch=<arg>, --no-offload-arch=<arg> 478 479CUDA offloading device architecture (e.g. sm\_35), or HIP offloading target ID in the form of a device architecture followed by target ID features delimited by a colon. Each target ID feature is a pre-defined string followed by a plus or minus sign (e.g. gfx908:xnack+:sram-ecc-). May be specified more than once. 480 481.. option:: -p, --profile 482 483.. option:: -pagezero\_size<arg> 484 485.. option:: -pg 486 487Enable mcount instrumentation 488 489.. option:: -pipe, --pipe 490 491Use pipes between commands, when possible 492 493.. option:: -prebind 494 495.. program:: clang1 496.. option:: -prebind\_all\_twolevel\_modules 497.. program:: clang 498 499.. option:: -preload 500 501.. option:: --print-diagnostic-categories 502 503.. option:: -print-effective-triple, --print-effective-triple 504 505Print the effective target triple 506 507.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 508 509Print the full library path of <file> 510 511.. option:: -print-ivar-layout 512 513Enable Objective-C Ivar layout bitmap print trace 514 515.. option:: -print-libgcc-file-name, --print-libgcc-file-name 516 517Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 518 519.. option:: -print-multi-directory, --print-multi-directory 520 521.. option:: -print-multi-lib, --print-multi-lib 522 523.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 524 525Print the full program path of <name> 526 527.. option:: -print-resource-dir, --print-resource-dir 528 529Print the resource directory pathname 530 531.. option:: -print-search-dirs, --print-search-dirs 532 533Print the paths used for finding libraries and programs 534 535.. option:: -print-target-triple, --print-target-triple 536 537Print the normalized target triple 538 539.. option:: -print-targets, --print-targets 540 541Print the registered targets 542 543.. option:: -private\_bundle 544 545.. option:: -pthread, -no-pthread 546 547Support POSIX threads in generated code 548 549.. option:: -pthreads 550 551.. option:: -read\_only\_relocs <arg> 552 553.. option:: -relocatable-pch, --relocatable-pch 554 555Whether to build a relocatable precompiled header 556 557.. option:: -remap 558 559.. option:: -rewrite-legacy-objc 560 561Rewrite Legacy Objective-C source to C++ 562 563.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 564 565Compiler runtime library to use 566 567.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 568 569Save llvm statistics. 570 571.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 572 573Save intermediate compilation results. 574 575.. option:: -sectalign <arg1> <arg2> <arg3> 576 577.. option:: -sectcreate <arg1> <arg2> <arg3> 578 579.. option:: -sectobjectsymbols <arg1> <arg2> 580 581.. option:: -sectorder <arg1> <arg2> <arg3> 582 583.. option:: -seg1addr<arg> 584 585.. option:: -seg\_addr\_table <arg> 586 587.. program:: clang1 588.. option:: -seg\_addr\_table\_filename <arg> 589.. program:: clang 590 591.. option:: -segaddr <arg1> <arg2> 592 593.. option:: -segcreate <arg1> <arg2> <arg3> 594 595.. option:: -seglinkedit 596 597.. option:: -segprot <arg1> <arg2> <arg3> 598 599.. option:: -segs\_read\_<arg> 600 601.. program:: clang1 602.. option:: -segs\_read\_only\_addr <arg> 603.. program:: clang 604 605.. program:: clang2 606.. option:: -segs\_read\_write\_addr <arg> 607.. program:: clang 608 609.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 610 611Serialize compiler diagnostics to a file 612 613.. option:: -shared-libgcc 614 615.. option:: -shared-libsan, -shared-libasan 616 617Dynamically link the sanitizer runtime 618 619.. option:: -single\_module 620 621.. option:: -static-libgcc 622 623.. option:: -static-libsan 624 625Statically link the sanitizer runtime 626 627.. option:: -static-libstdc++ 628 629.. option:: -static-openmp 630 631Use the static host OpenMP runtime while linking. 632 633.. option:: -std-default=<arg> 634 635.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 636 637C++ standard library to use 638 639.. option:: -sub\_library<arg> 640 641.. program:: clang1 642.. option:: -sub\_umbrella<arg> 643.. program:: clang 644 645.. option:: --sysroot=<arg>, --sysroot <arg> 646 647.. option:: --target-help 648 649.. option:: --target=<arg>, -target <arg> 650 651Generate code for the given target 652 653.. option:: -time 654 655Time individual commands 656 657.. option:: -traditional, --traditional 658 659.. option:: -traditional-cpp, --traditional-cpp 660 661Enable some traditional CPP emulation 662 663.. option:: -twolevel\_namespace 664 665.. program:: clang1 666.. option:: -twolevel\_namespace\_hints 667.. program:: clang 668 669.. option:: -umbrella <arg> 670 671.. option:: -unexported\_symbols\_list <arg> 672 673.. option:: -unwindlib=<arg>, --unwindlib=<arg> 674 675Unwind library to use 676 677.. option:: -v, --verbose 678 679Show commands to run and use verbose output 680 681.. option:: --verify-debug-info 682 683Verify the binary representation of debug output 684 685.. option:: --version 686 687Print version information 688 689.. option:: -w, --no-warnings 690 691Suppress all warnings 692 693.. option:: -weak-l<arg> 694 695.. option:: -weak\_framework <arg> 696 697.. program:: clang1 698.. option:: -weak\_library <arg> 699.. program:: clang 700 701.. program:: clang2 702.. option:: -weak\_reference\_mismatches <arg> 703.. program:: clang 704 705.. option:: -whatsloaded 706 707.. option:: -whyload 708 709.. option:: -working-directory<arg>, -working-directory=<arg> 710 711Resolve file paths relative to the specified directory 712 713.. option:: -x<language>, --language <arg>, --language=<arg> 714 715Treat subsequent input files as having type <language> 716 717.. option:: -y<arg> 718 719Actions 720======= 721The action to perform on the input. 722 723.. option:: -E, --preprocess 724 725Only run the preprocessor 726 727.. option:: -S, --assemble 728 729Only run preprocess and compilation steps 730 731.. option:: -c, --compile 732 733Only run preprocess, compile, and assemble steps 734 735.. option:: -emit-interface-stubs 736 737Generate Interface Stub Files. 738 739.. option:: -emit-llvm 740 741Use the LLVM representation for assembler and object files 742 743.. option:: -emit-merged-ifs 744 745Generate Interface Stub Files, emit merged text not binary. 746 747.. option:: -fsyntax-only 748 749.. option:: -module-file-info 750 751Provide information about a particular module file 752 753.. option:: --precompile 754 755Only precompile the input 756 757.. option:: -rewrite-objc 758 759Rewrite Objective-C source to C++ 760 761.. option:: -verify-pch 762 763Load and verify that a pre-compiled header file is not stale 764 765Compilation flags 766================= 767 768Flags controlling the behavior of Clang during compilation. These flags have 769no effect during actions that do not perform compilation. 770 771.. option:: -Xassembler <arg> 772 773Pass <arg> to the assembler 774 775.. option:: -Xclang <arg> 776 777Pass <arg> to the clang compiler 778 779.. option:: -fclang-abi-compat=<version> 780 781Attempt to match the ABI of Clang <version> 782 783.. option:: -fcomment-block-commands=<arg>,<arg2>... 784 785Treat each comma separated argument in <arg> as a documentation comment block command 786 787.. option:: -fcomplete-member-pointers, -fno-complete-member-pointers 788 789Require member pointer base types to be complete if they would be significant under the Microsoft ABI 790 791.. option:: -fcrash-diagnostics-dir=<arg> 792 793.. option:: -fdeclspec, -fno-declspec 794 795Allow \_\_declspec as a keyword 796 797.. option:: -fdepfile-entry=<arg> 798 799.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 800 801.. option:: -fdiagnostics-format=<arg> 802 803.. option:: -fdiagnostics-parseable-fixits 804 805Print fix-its in machine parseable form 806 807.. option:: -fdiagnostics-print-source-range-info 808 809Print source range spans in numeric form 810 811.. option:: -fdiagnostics-show-category=<arg> 812 813.. option:: -fdiscard-value-names, -fno-discard-value-names 814 815Discard value names in LLVM IR 816 817.. option:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager 818 819Enables an experimental new pass manager in LLVM. 820 821.. option:: -fexperimental-strict-floating-point 822 823Enables experimental strict floating point in LLVM. 824 825.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 826 827Use separate accesses for consecutive bitfield runs with legal widths and alignments. 828 829.. option:: -fglobal-isel, -fexperimental-isel, -fno-global-isel 830 831Enables the global instruction selector 832 833.. option:: -finline-functions, -fno-inline-functions 834 835Inline suitable functions 836 837.. option:: -finline-hint-functions 838 839Inline functions which are (explicitly or implicitly) marked inline 840 841.. option:: -fno-crash-diagnostics 842 843Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 844 845.. option:: -fno-sanitize-blacklist 846 847Don't use blacklist file for sanitizers 848 849.. option:: -fparse-all-comments 850 851.. option:: -frecord-command-line, -fno-record-command-line, -frecord-gcc-switches 852 853.. option:: -fsanitize-address-field-padding=<arg> 854 855Level of field padding for AddressSanitizer 856 857.. option:: -fsanitize-address-globals-dead-stripping 858 859Enable linker dead stripping of globals in AddressSanitizer 860 861.. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 862 863Enable poisoning array cookies when using custom operator new\[\] in AddressSanitizer 864 865.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 866 867Enable use-after-scope detection in AddressSanitizer 868 869.. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator 870 871Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size 872 873.. option:: -fsanitize-blacklist=<arg> 874 875Path to blacklist file for sanitizers 876 877.. option:: -fsanitize-cfi-canonical-jump-tables, -fno-sanitize-cfi-canonical-jump-tables 878 879Make the jump table addresses canonical in the symbol table 880 881.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 882 883Enable control flow integrity (CFI) checks for cross-DSO calls. 884 885.. option:: -fsanitize-cfi-icall-generalize-pointers 886 887Generalize pointers in CFI indirect call type signature checks 888 889.. option:: -fsanitize-coverage-allowlist=<arg>, -fsanitize-coverage-whitelist=<arg> 890 891Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones 892 893.. option:: -fsanitize-coverage-blocklist=<arg>, -fsanitize-coverage-blacklist=<arg> 894 895Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones 896 897.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 898 899Specify the type of coverage instrumentation for Sanitizers 900 901.. option:: -fsanitize-hwaddress-abi=<arg> 902 903Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused. 904 905.. option:: -fsanitize-link-c++-runtime, -fno-sanitize-link-c++-runtime 906 907.. option:: -fsanitize-link-runtime, -fno-sanitize-link-runtime 908 909.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 910 911Enable origins tracking in MemorySanitizer 912 913.. program:: clang1 914.. option:: -fsanitize-memory-track-origins=<arg> 915.. program:: clang 916 917Enable origins tracking in MemorySanitizer 918 919.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 920 921Enable use-after-destroy detection in MemorySanitizer 922 923.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 924 925.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>..., -fsanitize-recover (equivalent to -fsanitize-recover=all) 926 927Enable recovery for specified sanitizers 928 929.. option:: -fsanitize-stats, -fno-sanitize-stats 930 931Enable sanitizer statistics gathering. 932 933.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 934 935Enable atomic operations instrumentation in ThreadSanitizer (default) 936 937.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 938 939Enable function entry/exit instrumentation in ThreadSanitizer (default) 940 941.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 942 943Enable memory access instrumentation in ThreadSanitizer (default) 944 945.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>..., -fsanitize-trap (equivalent to -fsanitize-trap=all), -fsanitize-undefined-trap-on-error (equivalent to -fsanitize-trap=undefined) 946 947Enable trapping for specified sanitizers 948 949.. option:: -fsanitize-undefined-strip-path-components=<number> 950 951Strip (or keep only, if negative) a given number of path components when emitting check metadata. 952 953.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 954 955Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 956 957.. option:: -moutline, -mno-outline 958 959Enable function outlining (AArch64 only) 960 961.. option:: --param <arg>, --param=<arg> 962 963.. option:: -print-supported-cpus, --print-supported-cpus, -mcpu=?, -mtune=? 964 965Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target) 966 967.. option:: -std=<arg>, --std=<arg>, --std <arg> 968 969Language standard to compile for 970 971Preprocessor flags 972~~~~~~~~~~~~~~~~~~ 973 974Flags controlling the behavior of the Clang preprocessor. 975 976.. option:: -C, --comments 977 978Include comments in preprocessed output 979 980.. option:: -CC, --comments-in-macros 981 982Include comments from within macros in preprocessed output 983 984.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 985 986Define <macro> to <value> (or 1 if <value> omitted) 987 988.. option:: -H, --trace-includes 989 990Show header includes and nesting depth 991 992.. option:: -P, --no-line-commands 993 994Disable linemarker output in -E mode 995 996.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 997 998Undefine macro <macro> 999 1000.. option:: -Wp,<arg>,<arg2>... 1001 1002Pass the comma separated arguments in <arg> to the preprocessor 1003 1004.. option:: -Xpreprocessor <arg> 1005 1006Pass <arg> to the preprocessor 1007 1008.. option:: -fmacro-prefix-map=<arg> 1009 1010remap file source paths in predefined preprocessor macros 1011 1012Include path management 1013----------------------- 1014 1015Flags controlling how ``#include``\s are resolved to files. 1016 1017.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 1018 1019Add directory to include search path. If there are multiple -I options, these directories are searched in the order they are given before the standard system directories are searched. If the same directory is in the SYSTEM include search paths, for example if also specified with -isystem, the -I option will be ignored 1020 1021.. option:: -I-, --include-barrier 1022 1023Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 1024 1025.. option:: --cuda-path-ignore-env 1026 1027Ignore environment variables to detect CUDA installation 1028 1029.. option:: --cuda-path=<arg> 1030 1031CUDA installation path 1032 1033.. option:: -cxx-isystem<directory> 1034 1035Add directory to the C++ SYSTEM include search path 1036 1037.. option:: -fbuild-session-file=<file> 1038 1039Use the last modification time of <file> as the build session timestamp 1040 1041.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 1042 1043Time when the current build session started 1044 1045.. option:: -fmodule-file=\[<name>=\]<file> 1046 1047Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 1048 1049.. option:: -fmodules-cache-path=<directory> 1050 1051Specify the module cache path 1052 1053.. option:: -fmodules-disable-diagnostic-validation 1054 1055Disable validation of the diagnostic options when loading the module 1056 1057.. option:: -fmodules-prune-after=<seconds> 1058 1059Specify the interval (in seconds) after which a module file will be considered unused 1060 1061.. option:: -fmodules-prune-interval=<seconds> 1062 1063Specify the interval (in seconds) between attempts to prune the module cache 1064 1065.. option:: -fmodules-user-build-path <directory> 1066 1067Specify the module user build path 1068 1069.. option:: -fmodules-validate-once-per-build-session 1070 1071Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 1072 1073.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 1074 1075Validate the system headers that a module depends on when loading the module 1076 1077.. option:: -fprebuilt-module-path=<directory> 1078 1079Specify the prebuilt module path 1080 1081.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1082 1083Add directory to AFTER include search path 1084 1085.. option:: -iframework<arg> 1086 1087Add directory to SYSTEM framework search path 1088 1089.. option:: -iframeworkwithsysroot<directory> 1090 1091Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1092 1093.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1094 1095Include macros from file before parsing 1096 1097.. option:: -include<file>, --include<file>, --include=<arg> 1098 1099Include file before parsing 1100 1101.. option:: -include-pch <file> 1102 1103Include precompiled header file 1104 1105.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1106 1107Set the -iwithprefix/-iwithprefixbefore prefix 1108 1109.. option:: -iquote<directory> 1110 1111Add directory to QUOTE include search path 1112 1113.. option:: -isysroot<dir> 1114 1115Set the system root directory (usually /) 1116 1117.. option:: -isystem<directory> 1118 1119Add directory to SYSTEM include search path 1120 1121.. option:: -isystem-after<directory> 1122 1123Add directory to end of the SYSTEM include search path 1124 1125.. option:: -ivfsoverlay<arg> 1126 1127Overlay the virtual filesystem described by file over the real file system 1128 1129.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1130 1131Set directory to SYSTEM include search path with prefix 1132 1133.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1134 1135Set directory to include search path with prefix 1136 1137.. option:: -iwithsysroot<directory> 1138 1139Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1140 1141.. option:: --libomptarget-nvptx-path=<arg> 1142 1143Path to libomptarget-nvptx libraries 1144 1145.. option:: --ptxas-path=<arg> 1146 1147Path to ptxas (used for compiling CUDA code) 1148 1149.. option:: --rocm-path=<arg> 1150 1151ROCm installation path, used for finding and automatically linking required bitcode libraries. 1152 1153.. program:: clang1 1154.. option:: -stdlib++-isystem<directory> 1155.. program:: clang 1156 1157Use directory as the C++ standard library include path 1158 1159.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1160 1161Treat all #include paths starting with <prefix> as including a system header. 1162 1163Dependency file generation 1164-------------------------- 1165 1166Flags controlling generation of a dependency file for ``make``-like build 1167systems. 1168 1169.. option:: -M, --dependencies 1170 1171Like -MD, but also implies -E and writes to stdout by default 1172 1173.. option:: -MD, --write-dependencies 1174 1175Write a depfile containing user and system headers 1176 1177.. option:: -MF<file> 1178 1179Write depfile output from -MMD, -MD, -MM, or -M to <file> 1180 1181.. option:: -MG, --print-missing-file-dependencies 1182 1183Add missing headers to depfile 1184 1185.. option:: -MJ<arg> 1186 1187Write a compilation database entry per input 1188 1189.. option:: -MM, --user-dependencies 1190 1191Like -MMD, but also implies -E and writes to stdout by default 1192 1193.. option:: -MMD, --write-user-dependencies 1194 1195Write a depfile containing user headers 1196 1197.. option:: -MP 1198 1199Create phony target for each dependency (other than main file) 1200 1201.. option:: -MQ<arg> 1202 1203Specify name of main file output to quote in depfile 1204 1205.. option:: -MT<arg> 1206 1207Specify name of main file output in depfile 1208 1209.. option:: -MV 1210 1211Use NMake/Jom format for the depfile 1212 1213Dumping preprocessor state 1214-------------------------- 1215 1216Flags allowing the state of the preprocessor to be dumped in various ways. 1217 1218.. option:: -d 1219 1220.. program:: clang1 1221.. option:: -d<arg> 1222.. program:: clang 1223 1224.. option:: -dD 1225 1226Print macro definitions in -E mode in addition to normal output 1227 1228.. option:: -dI 1229 1230Print include directives in -E mode in addition to normal output 1231 1232.. option:: -dM 1233 1234Print macro definitions in -E mode instead of normal output 1235 1236Diagnostic flags 1237~~~~~~~~~~~~~~~~ 1238 1239Flags controlling which warnings, errors, and remarks Clang will generate. 1240See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1241 1242.. option:: -R<remark> 1243 1244Enable the specified remark 1245 1246.. option:: -Rpass-analysis=<arg> 1247 1248Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1249 1250.. option:: -Rpass-missed=<arg> 1251 1252Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1253 1254.. option:: -Rpass=<arg> 1255 1256Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1257 1258.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1259 1260Enable the specified warning 1261 1262.. option:: -Wdeprecated, -Wno-deprecated 1263 1264Enable warnings for deprecated constructs and define \_\_DEPRECATED 1265 1266.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1267 1268Target-independent compilation options 1269~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1270.. option:: -Wframe-larger-than=<arg> 1271 1272.. option:: -fPIC, -fno-PIC 1273 1274.. option:: -fPIE, -fno-PIE 1275 1276.. option:: -faddrsig, -fno-addrsig 1277 1278Emit an address-significance table 1279 1280.. option:: -falign-functions, -fno-align-functions 1281 1282.. program:: clang1 1283.. option:: -falign-functions=<arg> 1284.. program:: clang 1285 1286.. program:: clang1 1287.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1288.. program:: clang 1289 1290Enable C++17 aligned allocation functions 1291 1292.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1293 1294Treat editor placeholders as valid source code 1295 1296.. option:: -fallow-unsupported 1297 1298.. option:: -faltivec, -fno-altivec 1299 1300.. option:: -fansi-escape-codes 1301 1302Use ANSI escape codes for diagnostics 1303 1304.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1305 1306Use Apple's kernel extensions ABI 1307 1308.. option:: -fapple-link-rtlib 1309 1310Force linking the clang builtins runtime library 1311 1312.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1313 1314Enable Apple gcc-compatible #pragma pack handling 1315 1316.. option:: -fapplication-extension, -fno-application-extension 1317 1318Restrict code to those available for App Extensions 1319 1320.. option:: -fasm, -fno-asm 1321 1322.. option:: -fasm-blocks, -fno-asm-blocks 1323 1324.. option:: -fassociative-math, -fno-associative-math 1325 1326.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1327 1328.. option:: -fast 1329 1330.. option:: -fastcp 1331 1332.. option:: -fastf 1333 1334.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1335 1336.. option:: -fautolink, -fno-autolink 1337 1338.. option:: -fbasic-block-sections=<arg> 1339 1340Generate labels for each basic block or place each basic block or a subset of basic blocks in its own section. 1341 1342.. option:: -fblocks, -fno-blocks 1343 1344Enable the 'blocks' language feature 1345 1346.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1347 1348.. option:: -fborland-extensions, -fno-borland-extensions 1349 1350Accept non-standard constructs supported by the Borland compiler 1351 1352.. option:: -fbracket-depth=<arg> 1353 1354.. option:: -fbuiltin, -fno-builtin 1355 1356.. option:: -fbuiltin-module-map 1357 1358Load the clang builtins module map file. 1359 1360.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1361 1362.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1363 1364.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1365 1366Instrument control-flow architecture protection. Options: return, branch, full, none. 1367 1368.. option:: -fcf-runtime-abi=<arg> 1369 1370.. option:: -fchar8\_t, -fno-char8\_t 1371 1372Enable C++ builtin type char8\_t 1373 1374.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1375 1376.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1377 1378Enable colors in diagnostics 1379 1380.. option:: -fcommon, -fno-common 1381 1382Place uninitialized global variables in a common block 1383 1384.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1385 1386.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1387 1388.. option:: -fconstant-string-class=<arg> 1389 1390.. option:: -fconstexpr-backtrace-limit=<arg> 1391 1392.. option:: -fconstexpr-depth=<arg> 1393 1394.. option:: -fconstexpr-steps=<arg> 1395 1396.. option:: -fconvergent-functions 1397 1398Assume functions may be convergent 1399 1400.. option:: -fcoroutines-ts, -fno-coroutines-ts 1401 1402Enable support for the C++ Coroutines TS 1403 1404.. option:: -fcoverage-mapping, -fno-coverage-mapping 1405 1406Generate coverage mapping to enable code coverage analysis 1407 1408.. option:: -fcreate-profile 1409 1410.. option:: -fcs-profile-generate 1411 1412Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1413 1414.. program:: clang1 1415.. option:: -fcs-profile-generate=<directory> 1416.. program:: clang 1417 1418Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1419 1420.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 1421 1422Use approximate transcendental functions 1423 1424.. option:: -fcuda-short-ptr, -fno-cuda-short-ptr 1425 1426Use 32-bit pointers for accessing const/local/shared address spaces 1427 1428.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1429 1430Enable C++ exceptions 1431 1432.. option:: -fcxx-modules, -fno-cxx-modules 1433 1434.. option:: -fdata-sections, -fno-data-sections 1435 1436Place each data in its own section 1437 1438.. option:: -fdebug-compilation-dir <arg>, -fdebug-compilation-dir=<arg> 1439 1440The compilation directory to embed in the debug info. 1441 1442.. option:: -fdebug-default-version=<arg> 1443 1444Default DWARF version to use, if a -g option caused DWARF debug info to be produced 1445 1446.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1447 1448Emit extra debug info to make sample profile more accurate 1449 1450.. option:: -fdebug-macro, -fno-debug-macro 1451 1452Emit macro debug information 1453 1454.. option:: -fdebug-pass-arguments 1455 1456.. option:: -fdebug-pass-structure 1457 1458.. option:: -fdebug-prefix-map=<arg> 1459 1460remap file source paths in debug info 1461 1462.. option:: -fdebug-ranges-base-address, -fno-debug-ranges-base-address 1463 1464Use DWARF base address selection entries in .debug\_ranges 1465 1466.. option:: -fdebug-types-section, -fno-debug-types-section 1467 1468Place debug types in their own section (ELF Only) 1469 1470.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1471 1472Parse templated function definitions at the end of the translation unit 1473 1474.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1475 1476Treat usage of null pointers as undefined behavior (default) 1477 1478.. option:: -fdenormal-fp-math=<arg> 1479 1480.. option:: -fdiagnostics-absolute-paths 1481 1482Print absolute paths in diagnostics 1483 1484.. option:: -fdiagnostics-color, -fno-diagnostics-color 1485 1486.. program:: clang1 1487.. option:: -fdiagnostics-color=<arg> 1488.. program:: clang 1489 1490.. option:: -fdiagnostics-hotness-threshold=<number> 1491 1492Prevent optimization remarks from being output if they do not have at least this profile count 1493 1494.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1495 1496Enable profile hotness information in diagnostic line 1497 1498.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1499 1500Display include stacks for diagnostic notes 1501 1502.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1503 1504Print option name with mappable diagnostics 1505 1506.. option:: -fdiagnostics-show-template-tree 1507 1508Print a template comparison tree for differing templates 1509 1510.. option:: -fdigraphs, -fno-digraphs 1511 1512Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1513 1514.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1515 1516Allow '$' in identifiers 1517 1518.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1519 1520Enable '\[\[\]\]' attributes in all C and C++ language modes 1521 1522.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1523 1524.. option:: -fdwarf-exceptions 1525 1526Use DWARF style exceptions 1527 1528.. option:: -felide-constructors, -fno-elide-constructors 1529 1530.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1531 1532.. option:: -feliminate-unused-debug-types, -fno-eliminate-unused-debug-types 1533 1534Do not emit debug info for defined but unused types 1535 1536.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1537 1538Embed LLVM bitcode (option: off, all, bitcode, marker) 1539 1540.. option:: -femit-all-decls 1541 1542Emit all declarations, even if unused 1543 1544.. option:: -femulated-tls, -fno-emulated-tls 1545 1546Use emutls functions to access thread\_local variables 1547 1548.. option:: -fenable-matrix 1549 1550Enable matrix data type and related builtin functions 1551 1552.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1553 1554.. option:: -ferror-limit=<arg> 1555 1556.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1557 1558.. option:: -fexceptions, -fno-exceptions 1559 1560Enable support for exception handling 1561 1562.. option:: -fexec-charset=<arg> 1563 1564.. option:: -fexperimental-new-constant-interpreter 1565 1566Enable the experimental new constant interpreter 1567 1568.. option:: -fexperimental-relative-c++-abi-vtables, -fno-experimental-relative-c++-abi-vtables 1569 1570Use the experimental C++ class ABI for classes with virtual tables 1571 1572.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1573 1574.. option:: -ffast-math, -fno-fast-math 1575 1576Allow aggressive, lossy floating-point optimizations 1577 1578.. option:: -ffile-prefix-map=<arg> 1579 1580remap file source paths in debug info and predefined preprocessor macros 1581 1582.. option:: -ffinite-math-only, -fno-finite-math-only 1583 1584.. option:: -ffixed-point, -fno-fixed-point 1585 1586Enable fixed point types 1587 1588.. option:: -ffor-scope, -fno-for-scope 1589 1590.. option:: -fforce-dwarf-frame, -fno-force-dwarf-frame 1591 1592Always emit a debug frame section 1593 1594.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1595 1596Emits more virtual tables to improve devirtualization 1597 1598.. option:: -fforce-enable-int128, -fno-force-enable-int128 1599 1600Enable support for int128\_t type 1601 1602.. option:: -ffp-contract=<arg> 1603 1604Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma) \| off (never fuse). Default is 'fast' for CUDA/HIP and 'on' otherwise. 1605 1606.. option:: -ffp-exception-behavior=<arg> 1607 1608Specifies the exception behavior of floating-point operations. 1609 1610.. option:: -ffp-model=<arg> 1611 1612Controls the semantics of floating-point calculations. 1613 1614.. option:: -ffreestanding 1615 1616Assert that the compilation takes place in a freestanding environment 1617 1618.. option:: -ffunction-sections, -fno-function-sections 1619 1620Place each function in its own section 1621 1622.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1623 1624.. option:: -fgnu-keywords, -fno-gnu-keywords 1625 1626Allow GNU-extension keywords regardless of language standard 1627 1628.. option:: -fgnu-runtime 1629 1630Generate output compatible with the standard GNU Objective-C runtime 1631 1632.. option:: -fgnu89-inline, -fno-gnu89-inline 1633 1634Use the gnu89 inline semantics 1635 1636.. option:: -fgnuc-version=<arg> 1637 1638Sets various macros to claim compatibility with the given GCC version (default is 4.2.1) 1639 1640.. option:: -fgpu-allow-device-init, -fno-gpu-allow-device-init 1641 1642Allow device side init function in HIP 1643 1644.. option:: -fgpu-defer-diag, -fno-gpu-defer-diag 1645 1646Defer host/device related diagnostic messages for CUDA/HIP 1647 1648.. option:: -fgpu-rdc, -fcuda-rdc, -fno-gpu-rdc 1649 1650Generate relocatable device code, also known as separate compilation mode 1651 1652.. option:: -fhip-new-launch-api, -fno-hip-new-launch-api 1653 1654Use new kernel launching API for HIP 1655 1656.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1657 1658.. option:: -fhonor-nans, -fno-honor-nans 1659 1660.. option:: -fhosted 1661 1662.. option:: -fignore-exceptions 1663 1664Enable support for ignoring exception handling constructs 1665 1666.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1667 1668Implicitly search the file system for module map files. 1669 1670.. option:: -fimplicit-modules, -fno-implicit-modules 1671 1672.. option:: -finput-charset=<arg> 1673 1674.. option:: -finstrument-function-entry-bare 1675 1676Instrument function entry only, after inlining, without arguments to the instrumentation call 1677 1678.. option:: -finstrument-functions 1679 1680Generate calls to instrument function entry and exit 1681 1682.. option:: -finstrument-functions-after-inlining 1683 1684Like -finstrument-functions, but insert the calls after inlining 1685 1686.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1687 1688Enable the integrated assembler 1689 1690.. option:: -fintegrated-cc1, -fno-integrated-cc1 1691 1692Run cc1 in-process 1693 1694.. option:: -fjump-tables, -fno-jump-tables 1695 1696Use jump tables for lowering switches 1697 1698.. option:: -fkeep-static-consts, -fno-keep-static-consts 1699 1700Keep static const variables if unused 1701 1702.. option:: -flax-vector-conversions=<arg>, -flax-vector-conversions (equivalent to -flax-vector-conversions=integer), -fno-lax-vector-conversions (equivalent to -flax-vector-conversions=none) 1703 1704Enable implicit vector bit-casts 1705 1706.. option:: -flimited-precision=<arg> 1707 1708.. option:: -flto, -fno-lto 1709 1710Enable LTO in 'full' mode 1711 1712.. option:: -flto-jobs=<arg> 1713 1714Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1715 1716.. program:: clang1 1717.. option:: -flto=<arg> 1718.. program:: clang 1719 1720Set LTO mode to either 'full' or 'thin' 1721 1722.. option:: -fmacro-backtrace-limit=<arg> 1723 1724.. option:: -fmath-errno, -fno-math-errno 1725 1726Require math functions to indicate errors by setting errno 1727 1728.. option:: -fmax-tokens=<arg> 1729 1730Max total number of preprocessed tokens for -Wmax-tokens. 1731 1732.. option:: -fmax-type-align=<arg> 1733 1734Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1735 1736.. option:: -fmemory-profile, -fno-memory-profile 1737 1738Enable heap memory profiling 1739 1740.. option:: -fmerge-all-constants, -fno-merge-all-constants 1741 1742Allow merging of constants 1743 1744.. option:: -fmessage-length=<arg> 1745 1746Format message diagnostics so that they fit within N columns 1747 1748.. option:: -fmodule-file-deps, -fno-module-file-deps 1749 1750.. option:: -fmodule-map-file=<file> 1751 1752Load this module map file 1753 1754.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1755 1756Specify the name of the module to build 1757 1758.. option:: -fmodules, -fno-modules 1759 1760Enable the 'modules' language feature 1761 1762.. option:: -fmodules-decluse, -fno-modules-decluse 1763 1764Require declaration of modules used within a module 1765 1766.. option:: -fmodules-ignore-macro=<arg> 1767 1768Ignore the definition of the given macro when building and loading modules 1769 1770.. option:: -fmodules-search-all, -fno-modules-search-all 1771 1772Search even non-imported modules to resolve references 1773 1774.. option:: -fmodules-strict-decluse 1775 1776Like -fmodules-decluse but requires all headers to be in modules 1777 1778.. option:: -fmodules-ts 1779 1780Enable support for the C++ Modules TS 1781 1782.. option:: -fmodules-validate-input-files-content 1783 1784Validate PCM input files based on content if mtime differs 1785 1786.. option:: -fms-compatibility, -fno-ms-compatibility 1787 1788Enable full Microsoft Visual C++ compatibility 1789 1790.. option:: -fms-compatibility-version=<arg> 1791 1792Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1793 1794.. option:: -fms-extensions, -fno-ms-extensions 1795 1796Accept some non-standard constructs supported by the Microsoft compiler 1797 1798.. option:: -fms-memptr-rep=<arg> 1799 1800.. option:: -fms-volatile 1801 1802.. option:: -fmsc-version=<arg> 1803 1804Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1805 1806.. option:: -fmudflap 1807 1808.. option:: -fmudflapth 1809 1810.. option:: -fnested-functions 1811 1812.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1813 1814Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1815 1816.. option:: -fnext-runtime 1817 1818.. option:: -fno-access-control, -fno-no-access-control 1819 1820.. option:: -fno-builtin-<arg> 1821 1822Disable implicit builtin knowledge of a specific function 1823 1824.. option:: -fno-elide-type 1825 1826Do not elide types when printing diagnostics 1827 1828.. option:: -fno-max-type-align 1829 1830.. option:: -fno-operator-names 1831 1832Do not treat C++ operator name keywords as synonyms for operators 1833 1834.. option:: -fno-strict-modules-decluse 1835 1836.. option:: -fno-temp-file 1837 1838Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes 1839 1840.. option:: -fno-working-directory 1841 1842.. option:: -fno\_modules-validate-input-files-content 1843 1844.. program:: clang1 1845.. option:: -fno\_pch-validate-input-files-content 1846.. program:: clang 1847 1848.. option:: -fnoxray-link-deps 1849 1850.. option:: -fobjc-abi-version=<arg> 1851 1852.. option:: -fobjc-arc, -fno-objc-arc 1853 1854Synthesize retain and release calls for Objective-C pointers 1855 1856.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1857 1858Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1859 1860.. option:: -fobjc-convert-messages-to-runtime-calls, -fno-objc-convert-messages-to-runtime-calls 1861 1862.. option:: -fobjc-exceptions, -fno-objc-exceptions 1863 1864Enable Objective-C exceptions 1865 1866.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1867 1868.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1869 1870.. option:: -fobjc-link-runtime 1871 1872.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1873 1874.. option:: -fobjc-nonfragile-abi-version=<arg> 1875 1876.. option:: -fobjc-runtime=<arg> 1877 1878Specify the target Objective-C runtime kind and version 1879 1880.. option:: -fobjc-sender-dependent-dispatch 1881 1882.. option:: -fobjc-weak, -fno-objc-weak 1883 1884Enable ARC-style weak references in Objective-C 1885 1886.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1887 1888.. option:: -fopenmp, -fno-openmp 1889 1890Parse OpenMP pragmas and generate parallel code. 1891 1892.. option:: -fopenmp-simd, -fno-openmp-simd 1893 1894Emit OpenMP code only for SIMD-based constructs. 1895 1896.. option:: -fopenmp-version=<arg> 1897 1898.. program:: clang1 1899.. option:: -fopenmp=<arg> 1900.. program:: clang 1901 1902.. option:: -foperator-arrow-depth=<arg> 1903 1904.. option:: -foptimization-record-file=<file> 1905 1906Specify the output name of the file containing the optimization remarks. Implies -fsave-optimization-record. On Darwin platforms, this cannot be used with multiple -arch <arch> options. 1907 1908.. option:: -foptimization-record-passes=<regex> 1909 1910Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes) 1911 1912.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1913 1914.. option:: -forder-file-instrumentation 1915 1916Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1917 1918.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1919 1920.. option:: -fpack-struct, -fno-pack-struct 1921 1922.. program:: clang1 1923.. option:: -fpack-struct=<arg> 1924.. program:: clang 1925 1926Specify the default maximum struct packing alignment 1927 1928.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1929 1930Recognize and construct Pascal-style string literals 1931 1932.. option:: -fpass-plugin=<dsopath> 1933 1934Load pass plugin from a dynamic shared object file (only with new pass manager). 1935 1936.. option:: -fpatchable-function-entry=<N,M> 1937 1938Generate M NOPs before function entry and N-M NOPs after function entry 1939 1940.. option:: -fpcc-struct-return 1941 1942Override the default ABI to return all structs on the stack 1943 1944.. option:: -fpch-codegen, -fno-pch-codegen 1945 1946Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH 1947 1948.. option:: -fpch-debuginfo, -fno-pch-debuginfo 1949 1950Generate debug info for types in an object file built from this PCH and do not generate them elsewhere 1951 1952.. option:: -fpch-instantiate-templates, -fno-pch-instantiate-templates 1953 1954Instantiate templates already while building a PCH 1955 1956.. option:: -fpch-preprocess 1957 1958.. option:: -fpch-validate-input-files-content 1959 1960Validate PCH input files based on content if mtime differs 1961 1962.. option:: -fpic, -fno-pic 1963 1964.. option:: -fpie, -fno-pie 1965 1966.. option:: -fplt, -fno-plt 1967 1968.. option:: -fplugin=<dsopath> 1969 1970Load the named plugin (dynamic shared object) 1971 1972.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1973 1974.. option:: -fprofile-arcs, -fno-profile-arcs 1975 1976.. option:: -fprofile-dir=<arg> 1977 1978.. option:: -fprofile-exclude-files=<arg> 1979 1980Instrument only functions from files where names don't match all the regexes separated by a semi-colon 1981 1982.. option:: -fprofile-filter-files=<arg> 1983 1984Instrument only functions from files where names match any regex separated by a semi-colon 1985 1986.. option:: -fprofile-generate, -fno-profile-generate 1987 1988Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1989 1990.. program:: clang1 1991.. option:: -fprofile-generate=<directory> 1992.. program:: clang 1993 1994Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1995 1996.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1997 1998Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1999 2000.. program:: clang1 2001.. option:: -fprofile-instr-generate=<file> 2002.. program:: clang 2003 2004Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 2005 2006.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 2007 2008.. program:: clang1 2009.. option:: -fprofile-instr-use=<arg> 2010.. program:: clang 2011 2012Use instrumentation data for profile-guided optimization 2013 2014.. option:: -fprofile-remapping-file=<file>, -fprofile-remapping-file <arg> 2015 2016Use the remappings described in <file> to match the profile data against names in the program 2017 2018.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 2019 2020Specifies that the sample profile is accurate. If the sample 2021 profile is accurate, callsites without profile samples are marked 2022 as cold. Otherwise, treat callsites without profile samples as if 2023 we have no profile 2024 2025.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 2026 2027.. program:: clang1 2028.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 2029.. program:: clang 2030 2031Enable sample-based profile guided optimizations 2032 2033.. option:: -fprofile-update=<method> 2034 2035Set update method of profile counters (atomic,prefer-atomic,single) 2036 2037.. program:: clang1 2038.. option:: -fprofile-use=<pathname> 2039.. program:: clang 2040 2041Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 2042 2043.. option:: -freciprocal-math, -fno-reciprocal-math 2044 2045Allow division operations to be reassociated 2046 2047.. option:: -freg-struct-return 2048 2049Override the default ABI to return small structs in registers 2050 2051.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 2052 2053Use atexit or \_\_cxa\_atexit to register global destructors 2054 2055.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 2056 2057Enable C++17 relaxed template template argument matching 2058 2059.. option:: -freroll-loops, -fno-reroll-loops 2060 2061Turn on loop reroller 2062 2063.. option:: -fretain-comments-from-system-headers 2064 2065.. option:: -frewrite-imports, -fno-rewrite-imports 2066 2067.. option:: -frewrite-includes, -fno-rewrite-includes 2068 2069.. option:: -frewrite-map-file <arg> 2070 2071.. program:: clang1 2072.. option:: -frewrite-map-file=<arg> 2073.. program:: clang 2074 2075.. option:: -fropi, -fno-ropi 2076 2077Generate read-only position independent code (ARM only) 2078 2079.. option:: -frounding-math, -fno-rounding-math 2080 2081.. option:: -frtti, -fno-rtti 2082 2083.. option:: -frtti-data, -fno-rtti-data 2084 2085.. option:: -frwpi, -fno-rwpi 2086 2087Generate read-write position independent code (ARM only) 2088 2089.. option:: -fsave-optimization-record, -fno-save-optimization-record 2090 2091Generate a YAML optimization record file 2092 2093.. program:: clang1 2094.. option:: -fsave-optimization-record=<format> 2095.. program:: clang 2096 2097Generate an optimization record file in a specific format 2098 2099.. option:: -fseh-exceptions 2100 2101Use SEH style exceptions 2102 2103.. option:: -fsemantic-interposition, -fno-semantic-interposition 2104 2105.. option:: -fshort-enums, -fno-short-enums 2106 2107Allocate to an enum type only as many bytes as it needs for the declared range of possible values 2108 2109.. option:: -fshort-wchar, -fno-short-wchar 2110 2111Force wchar\_t to be a short unsigned int 2112 2113.. option:: -fshow-column, -fno-show-column 2114 2115.. option:: -fshow-overloads=<arg> 2116 2117Which overload candidates to show when overload resolution fails: best\|all; defaults to all 2118 2119.. option:: -fshow-source-location, -fno-show-source-location 2120 2121.. option:: -fsignaling-math, -fno-signaling-math 2122 2123.. option:: -fsigned-bitfields 2124 2125.. option:: -fsigned-char, -fno-signed-char, --signed-char 2126 2127char is signed 2128 2129.. option:: -fsigned-zeros, -fno-signed-zeros 2130 2131.. option:: -fsized-deallocation, -fno-sized-deallocation 2132 2133Enable C++14 sized global deallocation functions 2134 2135.. option:: -fsjlj-exceptions 2136 2137Use SjLj style exceptions 2138 2139.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 2140 2141Enable the superword-level parallelism vectorization passes 2142 2143.. option:: -fspell-checking, -fno-spell-checking 2144 2145.. option:: -fspell-checking-limit=<arg> 2146 2147.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 2148 2149Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 2150 2151.. option:: -fsplit-lto-unit, -fno-split-lto-unit 2152 2153Enables splitting of the LTO unit 2154 2155.. option:: -fsplit-machine-functions, -fno-split-machine-functions 2156 2157Enable late function splitting using profile information (x86 ELF) 2158 2159.. option:: -fsplit-stack 2160 2161.. option:: -fstack-clash-protection, -fno-stack-clash-protection 2162 2163Enable stack clash protection 2164 2165.. option:: -fstack-protector, -fno-stack-protector 2166 2167Enable stack protectors for some functions vulnerable to stack smashing. This uses a loose heuristic which considers functions vulnerable if they contain a char (or 8bit integer) array or constant sized calls to alloca , which are of greater size than ssp-buffer-size (default: 8 bytes). All variable sized calls to alloca are considered vulnerable. A function with a stack protector has a guard value added to the stack frame that is checked on function exit. The guard value must be positioned in the stack frame such that a buffer overflow from a vulnerable variable will overwrite the guard value before overwriting the function's return address. The reference stack guard value is stored in a global variable. 2168 2169.. option:: -fstack-protector-all 2170 2171Enable stack protectors for all functions 2172 2173.. option:: -fstack-protector-strong 2174 2175Enable stack protectors for some functions vulnerable to stack smashing. Compared to -fstack-protector, this uses a stronger heuristic that includes functions containing arrays of any size (and any type), as well as any calls to alloca or the taking of an address from a local variable 2176 2177.. option:: -fstack-size-section, -fno-stack-size-section 2178 2179Emit section containing metadata on function stack sizes 2180 2181.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 2182 2183Emit full debug info for all types used by the program 2184 2185.. option:: -fstrict-aliasing, -fno-strict-aliasing 2186 2187.. option:: -fstrict-enums, -fno-strict-enums 2188 2189Enable optimizations based on the strict definition of an enum's value range 2190 2191.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 2192 2193Assume that overflowing float-to-int casts are undefined (default) 2194 2195.. option:: -fstrict-overflow, -fno-strict-overflow 2196 2197.. option:: -fstrict-return, -fno-strict-return 2198 2199.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 2200 2201Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 2202 2203.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 2204 2205.. option:: -fsymbol-partition=<arg> 2206 2207.. option:: -ftabstop=<arg> 2208 2209.. option:: -ftemplate-backtrace-limit=<arg> 2210 2211.. option:: -ftemplate-depth-<arg> 2212 2213.. option:: -ftemplate-depth=<arg> 2214 2215.. option:: -ftest-coverage, -fno-test-coverage 2216 2217.. option:: -fthin-link-bitcode=<arg> 2218 2219Write minimized bitcode to <file> for the ThinLTO thin link only 2220 2221.. option:: -fthinlto-index=<arg> 2222 2223Perform ThinLTO importing using provided function summary index 2224 2225.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 2226 2227.. option:: -ftime-report 2228 2229.. option:: -ftime-trace 2230 2231 2232Turn on time profiler. Generates JSON file based on output filename. Results 2233can be analyzed with chrome://tracing or `Speedscope App 2234<https://www.speedscope.app>`_ for flamegraph visualization. 2235 2236.. option:: -ftime-trace-granularity=<arg> 2237 2238Minimum time granularity (in microseconds) traced by time profiler 2239 2240.. option:: -ftls-model=<arg> 2241 2242.. option:: -ftrap-function=<arg> 2243 2244Issue call to specified function rather than a trap instruction 2245 2246.. option:: -ftrapping-math, -fno-trapping-math 2247 2248.. option:: -ftrapv 2249 2250Trap on integer overflow 2251 2252.. option:: -ftrapv-handler <arg> 2253 2254.. program:: clang1 2255.. option:: -ftrapv-handler=<function name> 2256.. program:: clang 2257 2258Specify the function to be called on overflow 2259 2260.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 2261 2262Process trigraph sequences 2263 2264.. option:: -ftrivial-auto-var-init-stop-after=<arg> 2265 2266Stop initializing trivial automatic stack variables after the specified number of instances 2267 2268.. option:: -ftrivial-auto-var-init=<arg> 2269 2270Initialize trivial automatic stack variables: uninitialized (default) \| pattern 2271 2272.. option:: -funique-basic-block-section-names, -fno-unique-basic-block-section-names 2273 2274Use unique names for basic block sections (ELF Only) 2275 2276.. option:: -funique-internal-linkage-names, -fno-unique-internal-linkage-names 2277 2278Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path 2279 2280.. option:: -funique-section-names, -fno-unique-section-names 2281 2282.. option:: -funit-at-a-time, -fno-unit-at-a-time 2283 2284.. option:: -funroll-loops, -fno-unroll-loops 2285 2286Turn on loop unroller 2287 2288.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 2289 2290.. option:: -funsigned-bitfields 2291 2292.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 2293 2294.. option:: -funwind-tables, -fno-unwind-tables 2295 2296.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 2297 2298.. option:: -fuse-init-array, -fno-use-init-array 2299 2300.. option:: -fuse-ld=<arg> 2301 2302.. option:: -fuse-line-directives, -fno-use-line-directives 2303 2304Use #line in preprocessed output 2305 2306.. option:: -fvalidate-ast-input-files-content 2307 2308Compute and store the hash of input files used to build an AST. Files with mismatching mtime's are considered valid if both contents is identical 2309 2310.. option:: -fveclib=<arg> 2311 2312Use the given vector functions library 2313 2314.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2315 2316Enable the loop vectorization passes 2317 2318.. option:: -fverbose-asm, -dA, -fno-verbose-asm 2319 2320Generate verbose assembly output 2321 2322.. option:: -fvirtual-function-elimination, -fno-virtual-function-elimination 2323 2324Enables dead virtual function elimination optimization. Requires -flto=full 2325 2326.. option:: -fvisibility-global-new-delete-hidden 2327 2328Give global C++ operator new and delete declarations hidden visibility 2329 2330.. option:: -fvisibility-inlines-hidden 2331 2332Give inline C++ member functions hidden visibility by default 2333 2334.. option:: -fvisibility-inlines-hidden-static-local-var, -fno-visibility-inlines-hidden-static-local-var 2335 2336When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default 2337 2338.. option:: -fvisibility-ms-compat 2339 2340Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2341 2342.. option:: -fvisibility=<arg> 2343 2344Set the default symbol visibility for all global declarations 2345 2346.. option:: -fwasm-exceptions 2347 2348Use WebAssembly style exceptions 2349 2350.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2351 2352Enables whole-program vtable optimization. Requires -flto 2353 2354.. option:: -fwrapv, -fno-wrapv 2355 2356Treat signed integer overflow as two's complement 2357 2358.. option:: -fwritable-strings 2359 2360Store string literals as writable data 2361 2362.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2363 2364Always emit \_\_xray\_customevent(...) calls even if the containing function is not always instrumented 2365 2366.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2367 2368Always emit \_\_xray\_typedevent(...) calls even if the containing function is not always instrumented 2369 2370.. option:: -fxray-always-instrument=<arg> 2371 2372DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2373 2374.. option:: -fxray-attr-list=<arg> 2375 2376Filename defining the list of functions/types for imbuing XRay attributes. 2377 2378.. option:: -fxray-function-groups=<arg> 2379 2380Only instrument 1 of N groups 2381 2382.. option:: -fxray-function-index, -fno-xray-function-index 2383 2384.. option:: -fxray-ignore-loops, -fno-xray-ignore-loops 2385 2386Don't instrument functions with loops unless they also meet the minimum function size 2387 2388.. option:: -fxray-instruction-threshold<arg> 2389 2390.. program:: clang1 2391.. option:: -fxray-instruction-threshold=<arg> 2392.. program:: clang 2393 2394Sets the minimum function size to instrument with XRay 2395 2396.. option:: -fxray-instrument, -fno-xray-instrument 2397 2398Generate XRay instrumentation sleds on function entry and exit 2399 2400.. option:: -fxray-instrumentation-bundle=<arg> 2401 2402Select which XRay instrumentation points to emit. Options: all, none, function-entry, function-exit, function, custom. Default is 'all'. 'function' includes both 'function-entry' and 'function-exit'. 2403 2404.. option:: -fxray-link-deps 2405 2406Tells clang to add the link dependencies for XRay. 2407 2408.. option:: -fxray-modes=<arg> 2409 2410List of modes to link in by default into XRay instrumented binaries. 2411 2412.. option:: -fxray-never-instrument=<arg> 2413 2414DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2415 2416.. option:: -fxray-selected-function-group=<arg> 2417 2418When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1 2419 2420.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2421 2422.. option:: -fzvector, -fno-zvector, -mzvector 2423 2424Enable System z vector language extension 2425 2426.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2427 2428.. option:: -pedantic-errors, --pedantic-errors 2429 2430OpenCL flags 2431------------ 2432.. option:: -cl-denorms-are-zero 2433 2434OpenCL only. Allow denormals to be flushed to zero. 2435 2436.. option:: -cl-fast-relaxed-math 2437 2438OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2439 2440.. option:: -cl-finite-math-only 2441 2442OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2443 2444.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2445 2446OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2447 2448.. option:: -cl-kernel-arg-info 2449 2450OpenCL only. Generate kernel argument metadata. 2451 2452.. option:: -cl-mad-enable 2453 2454OpenCL only. Allow use of less precise MAD computations in the generated binary. 2455 2456.. option:: -cl-no-signed-zeros 2457 2458OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2459 2460.. option:: -cl-opt-disable 2461 2462OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2463 2464.. option:: -cl-single-precision-constant 2465 2466OpenCL only. Treat double precision floating-point constant as single precision constant. 2467 2468.. option:: -cl-std=<arg> 2469 2470OpenCL language standard to compile for. 2471 2472.. option:: -cl-strict-aliasing 2473 2474OpenCL only. This option is added for compatibility with OpenCL 1.0. 2475 2476.. option:: -cl-uniform-work-group-size 2477 2478OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2479 2480.. option:: -cl-unsafe-math-optimizations 2481 2482OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2483 2484SYCL flags 2485---------- 2486.. option:: -fsycl, -fno-sycl 2487 2488Enable SYCL kernels compilation for device 2489 2490.. option:: -sycl-std=<arg> 2491 2492SYCL language standard to compile for. 2493 2494Target-dependent compilation options 2495~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2496.. option:: -G<size>, -G=<arg>, -msmall-data-limit=<arg>, -msmall-data-threshold=<arg> 2497 2498Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2499 2500.. option:: -ffixed-x1 2501 2502Reserve the x1 register (AArch64/RISC-V only) 2503 2504.. option:: -ffixed-x10 2505 2506Reserve the x10 register (AArch64/RISC-V only) 2507 2508.. option:: -ffixed-x11 2509 2510Reserve the x11 register (AArch64/RISC-V only) 2511 2512.. option:: -ffixed-x12 2513 2514Reserve the x12 register (AArch64/RISC-V only) 2515 2516.. option:: -ffixed-x13 2517 2518Reserve the x13 register (AArch64/RISC-V only) 2519 2520.. option:: -ffixed-x14 2521 2522Reserve the x14 register (AArch64/RISC-V only) 2523 2524.. option:: -ffixed-x15 2525 2526Reserve the x15 register (AArch64/RISC-V only) 2527 2528.. option:: -ffixed-x16 2529 2530Reserve the x16 register (AArch64/RISC-V only) 2531 2532.. option:: -ffixed-x17 2533 2534Reserve the x17 register (AArch64/RISC-V only) 2535 2536.. option:: -ffixed-x18 2537 2538Reserve the x18 register (AArch64/RISC-V only) 2539 2540.. option:: -ffixed-x19 2541 2542Reserve the x19 register (AArch64/RISC-V only) 2543 2544.. option:: -ffixed-x2 2545 2546Reserve the x2 register (AArch64/RISC-V only) 2547 2548.. option:: -ffixed-x20 2549 2550Reserve the x20 register (AArch64/RISC-V only) 2551 2552.. option:: -ffixed-x21 2553 2554Reserve the x21 register (AArch64/RISC-V only) 2555 2556.. option:: -ffixed-x22 2557 2558Reserve the x22 register (AArch64/RISC-V only) 2559 2560.. option:: -ffixed-x23 2561 2562Reserve the x23 register (AArch64/RISC-V only) 2563 2564.. option:: -ffixed-x24 2565 2566Reserve the x24 register (AArch64/RISC-V only) 2567 2568.. option:: -ffixed-x25 2569 2570Reserve the x25 register (AArch64/RISC-V only) 2571 2572.. option:: -ffixed-x26 2573 2574Reserve the x26 register (AArch64/RISC-V only) 2575 2576.. option:: -ffixed-x27 2577 2578Reserve the x27 register (AArch64/RISC-V only) 2579 2580.. option:: -ffixed-x28 2581 2582Reserve the x28 register (AArch64/RISC-V only) 2583 2584.. option:: -ffixed-x29 2585 2586Reserve the x29 register (AArch64/RISC-V only) 2587 2588.. option:: -ffixed-x3 2589 2590Reserve the x3 register (AArch64/RISC-V only) 2591 2592.. option:: -ffixed-x30 2593 2594Reserve the x30 register (AArch64/RISC-V only) 2595 2596.. option:: -ffixed-x31 2597 2598Reserve the x31 register (AArch64/RISC-V only) 2599 2600.. option:: -ffixed-x4 2601 2602Reserve the x4 register (AArch64/RISC-V only) 2603 2604.. option:: -ffixed-x5 2605 2606Reserve the x5 register (AArch64/RISC-V only) 2607 2608.. option:: -ffixed-x6 2609 2610Reserve the x6 register (AArch64/RISC-V only) 2611 2612.. option:: -ffixed-x7 2613 2614Reserve the x7 register (AArch64/RISC-V only) 2615 2616.. option:: -ffixed-x8 2617 2618Reserve the x8 register (AArch64/RISC-V only) 2619 2620.. option:: -ffixed-x9 2621 2622Reserve the x9 register (AArch64/RISC-V only) 2623 2624.. option:: -m16 2625 2626.. option:: -m32 2627 2628.. option:: -m64 2629 2630.. option:: -mabi=<arg> 2631 2632.. option:: -maix-struct-return 2633 2634Return all structs in memory (PPC32 only) 2635 2636.. option:: -malign-branch-boundary=<arg> 2637 2638Specify the boundary's size to align branches 2639 2640.. option:: -malign-branch=<arg1>,<arg2>... 2641 2642Specify types of branches to align 2643 2644.. option:: -malign-double 2645 2646Align doubles to two words in structs (x86 only) 2647 2648.. option:: -march=<arg> 2649 2650.. option:: -masm=<arg> 2651 2652.. option:: -mbackchain, -mno-backchain 2653 2654Link stack frames through backchain on System Z 2655 2656.. option:: -mbranches-within-32B-boundaries 2657 2658Align selected branches (fused, jcc, jmp) within 32-byte boundary 2659 2660.. option:: -mcmodel=<arg>, -mcmodel=medany (equivalent to -mcmodel=medium), -mcmodel=medlow (equivalent to -mcmodel=small) 2661 2662.. option:: -mcode-object-v3, -mno-code-object-v3 2663 2664Legacy option to specify code object ABI V2 (-mnocode-object-v3) or V3 (-mcode-object-v3) (AMDGPU only) 2665 2666.. option:: -mconsole<arg> 2667 2668.. program:: clang1 2669.. option:: -mcpu=<arg>, -mv5 (equivalent to -mcpu=hexagonv5), -mv55 (equivalent to -mcpu=hexagonv55), -mv60 (equivalent to -mcpu=hexagonv60), -mv62 (equivalent to -mcpu=hexagonv62), -mv65 (equivalent to -mcpu=hexagonv65), -mv66 (equivalent to -mcpu=hexagonv66), -mv67 (equivalent to -mcpu=hexagonv67), -mv67t (equivalent to -mcpu=hexagonv67t) 2670.. program:: clang 2671 2672.. option:: -mcrc, -mno-crc 2673 2674Allow use of CRC instructions (ARM/Mips only) 2675 2676.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2677 2678.. option:: -mdll<arg> 2679 2680.. option:: -mdouble=<arg> 2681 2682Force double to be 32 bits or 64 bits 2683 2684.. option:: -mdynamic-no-pic<arg> 2685 2686.. option:: -meabi <arg> 2687 2688Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2689 2690.. option:: -menable-experimental-extensions 2691 2692Enable use of experimental RISC-V extensions. 2693 2694.. option:: -mfentry 2695 2696Insert calls to fentry at function entry (x86/SystemZ only) 2697 2698.. option:: -mfloat-abi=<arg> 2699 2700.. option:: -mfpmath=<arg> 2701 2702.. option:: -mfpu=<arg> 2703 2704.. option:: -mglobal-merge, -mno-global-merge 2705 2706Enable merging of globals 2707 2708.. option:: -mhard-float 2709 2710.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2711 2712.. option:: -mhwmult=<arg> 2713 2714.. option:: -miamcu, -mno-iamcu 2715 2716Use Intel MCU ABI 2717 2718.. option:: -mignore-xcoff-visibility 2719 2720Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file 2721 2722.. option:: -mimplicit-float, -mno-implicit-float 2723 2724.. option:: -mimplicit-it=<arg> 2725 2726.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2727 2728(integrated-as) Emit an object file which can be used with an incremental linker 2729 2730.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2731 2732.. option:: -mkernel 2733 2734.. option:: -mlong-calls, -mno-long-calls 2735 2736Generate branches with extended addressability, usually via indirect jumps. 2737 2738.. option:: -mlvi-cfi, -mno-lvi-cfi 2739 2740Enable only control-flow mitigations for Load Value Injection (LVI) 2741 2742.. option:: -mlvi-hardening, -mno-lvi-hardening 2743 2744Enable all mitigations for Load Value Injection (LVI) 2745 2746.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2747 2748Set Mac OS X deployment target 2749 2750.. option:: -mmcu=<arg> 2751 2752.. option:: -mms-bitfields, -mno-ms-bitfields 2753 2754Set the default structure layout to be compatible with the Microsoft compiler standard 2755 2756.. option:: -mnop-mcount 2757 2758Generate mcount/\_\_fentry\_\_ calls as nops. To activate they need to be patched in. 2759 2760.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2761 2762Omit frame pointer setup for leaf functions 2763 2764.. option:: -moslib=<arg> 2765 2766.. option:: -mpacked-stack, -mno-packed-stack 2767 2768Use packed stack layout (SystemZ only). 2769 2770.. option:: -mpad-max-prefix-size=<arg> 2771 2772Specify maximum number of prefixes to use for padding 2773 2774.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2775 2776Use copy relocations support for PIE builds 2777 2778.. option:: -mprefer-vector-width=<arg> 2779 2780Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2781 2782.. option:: -mqdsp6-compat 2783 2784Enable hexagon-qdsp6 backward compatibility 2785 2786.. option:: -mrecip 2787 2788.. program:: clang1 2789.. option:: -mrecip=<arg1>,<arg2>... 2790.. program:: clang 2791 2792.. option:: -mrecord-mcount 2793 2794Generate a \_\_mcount\_loc section entry for each \_\_fentry\_\_ call. 2795 2796.. option:: -mred-zone, -mno-red-zone 2797 2798.. option:: -mregparm=<arg> 2799 2800.. option:: -mrelax, -mno-relax 2801 2802Enable linker relaxation 2803 2804.. option:: -mrelax-all, -mno-relax-all 2805 2806(integrated-as) Relax all machine instructions 2807 2808.. option:: -mretpoline, -mno-retpoline 2809 2810.. option:: -mrtd, -mno-rtd 2811 2812Make StdCall calling convention the default 2813 2814.. option:: -mseses, -mno-seses 2815 2816Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations 2817 2818.. option:: -msign-return-address=<arg> 2819 2820Select return address signing scope 2821 2822.. option:: -msim 2823 2824.. option:: -msoft-float, -mno-soft-float 2825 2826Use software floating point 2827 2828.. option:: -mspeculative-load-hardening, -mno-speculative-load-hardening 2829 2830.. option:: -mstack-alignment=<arg> 2831 2832Set the stack alignment 2833 2834.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2835 2836Enable stack probes 2837 2838.. option:: -mstack-probe-size=<arg> 2839 2840Set the stack probe size 2841 2842.. option:: -mstack-protector-guard-offset=<arg> 2843 2844Use the given offset for addressing the stack-protector guard 2845 2846.. option:: -mstack-protector-guard-reg=<arg> 2847 2848Use the given reg for addressing the stack-protector guard 2849 2850.. option:: -mstack-protector-guard=<arg> 2851 2852Use the given guard (global, tls) for addressing the stack-protector guard 2853 2854.. option:: -mstackrealign, -mno-stackrealign 2855 2856Force realign the stack at entry to every function 2857 2858.. option:: -msvr4-struct-return 2859 2860Return small structs in registers (PPC32 only) 2861 2862.. option:: -mthread-model <arg> 2863 2864The thread model to use, e.g. posix, single (posix by default) 2865 2866.. option:: -mthreads<arg> 2867 2868.. option:: -mthumb, -mno-thumb 2869 2870.. option:: -mtls-direct-seg-refs, -mno-tls-direct-seg-refs 2871 2872Enable direct TLS access through segment registers (default) 2873 2874.. option:: -mtls-size=<arg> 2875 2876Specify bit size of immediate TLS offsets (AArch64 ELF only): 12 (for 4KB) \| 24 (for 16MB, default) \| 32 (for 4GB) \| 48 (for 256TB, needs -mcmodel=large) 2877 2878.. program:: clang1 2879.. option:: -mtune=<arg> 2880.. program:: clang 2881 2882Only supported on X86 and RISC-V. Otherwise accepted for compatibility with GCC. 2883 2884.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2885 2886.. option:: -municode<arg> 2887 2888.. option:: -mvx, -mno-vx 2889 2890.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2891 2892.. option:: -mwatchos-version-min=<arg> 2893 2894.. option:: -mwavefrontsize64, -mno-wavefrontsize64 2895 2896Specify wavefront size 64 mode (AMDGPU only) 2897 2898.. option:: -mwindows<arg> 2899 2900.. option:: -mx32 2901 2902AARCH64 2903------- 2904.. option:: -fcall-saved-x10 2905 2906Make the x10 register call-saved (AArch64 only) 2907 2908.. option:: -fcall-saved-x11 2909 2910Make the x11 register call-saved (AArch64 only) 2911 2912.. option:: -fcall-saved-x12 2913 2914Make the x12 register call-saved (AArch64 only) 2915 2916.. option:: -fcall-saved-x13 2917 2918Make the x13 register call-saved (AArch64 only) 2919 2920.. option:: -fcall-saved-x14 2921 2922Make the x14 register call-saved (AArch64 only) 2923 2924.. option:: -fcall-saved-x15 2925 2926Make the x15 register call-saved (AArch64 only) 2927 2928.. option:: -fcall-saved-x18 2929 2930Make the x18 register call-saved (AArch64 only) 2931 2932.. option:: -fcall-saved-x8 2933 2934Make the x8 register call-saved (AArch64 only) 2935 2936.. option:: -fcall-saved-x9 2937 2938Make the x9 register call-saved (AArch64 only) 2939 2940.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2941 2942Workaround Cortex-A53 erratum 835769 (AArch64 only) 2943 2944.. option:: -mgeneral-regs-only 2945 2946Generate code which only uses the general purpose registers (AArch64 only) 2947 2948.. option:: -mmark-bti-property 2949 2950Add .note.gnu.property with BTI to assembly files (AArch64 only) 2951 2952.. option:: -msve-vector-bits=<arg> 2953 2954Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only) 2955 2956AMDGPU 2957------ 2958.. option:: -mcumode, -mno-cumode 2959 2960Specify CU (-mcumode) or WGP (-mno-cumode) wavefront execution mode (AMDGPU only) 2961 2962.. option:: -msram-ecc, -mno-sram-ecc 2963 2964Specify SRAM ECC mode (AMDGPU only) 2965 2966.. option:: -mxnack, -mno-xnack 2967 2968Specify XNACK mode (AMDGPU only) 2969 2970ARM 2971--- 2972.. option:: -faapcs-bitfield-load 2973 2974Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only). 2975 2976.. option:: -faapcs-bitfield-width, -fno-aapcs-bitfield-width 2977 2978Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only). 2979 2980.. option:: -ffixed-r9 2981 2982Reserve the r9 register (ARM only) 2983 2984.. option:: -mcmse 2985 2986Allow use of CMSE (Armv8-M Security Extensions) 2987 2988.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2989 2990Disallow generation of data access to code sections (ARM only) 2991 2992.. option:: -mno-movt 2993 2994Disallow use of movt/movw pairs (ARM only) 2995 2996.. option:: -mno-neg-immediates 2997 2998Disallow converting instructions with negative immediates to their negation or inversion. 2999 3000.. option:: -mnocrc 3001 3002Disallow use of CRC instructions (ARM only) 3003 3004.. option:: -mrestrict-it, -mno-restrict-it 3005 3006Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 3007 3008.. option:: -mtp=<arg> 3009 3010Thread pointer access method (AArch32/AArch64 only) 3011 3012.. option:: -munaligned-access, -mno-unaligned-access 3013 3014Allow memory accesses to be unaligned (AArch32/AArch64 only) 3015 3016Hexagon 3017------- 3018.. option:: -mieee-rnd-near 3019 3020.. option:: -mmemops, -mno-memops 3021 3022Enable generation of memop instructions 3023 3024.. option:: -mnvj, -mno-nvj 3025 3026Enable generation of new-value jumps 3027 3028.. option:: -mnvs, -mno-nvs 3029 3030Enable generation of new-value stores 3031 3032.. option:: -mpackets, -mno-packets 3033 3034Enable generation of instruction packets 3035 3036Hexagon 3037------- 3038.. option:: -mhvx, -mno-hvx 3039 3040Enable Hexagon Vector eXtensions 3041 3042.. option:: -mhvx-length=<arg> 3043 3044Set Hexagon Vector Length 3045 3046.. program:: clang1 3047.. option:: -mhvx=<arg> 3048.. program:: clang 3049 3050Enable Hexagon Vector eXtensions 3051 3052MIPS 3053---- 3054.. option:: -mabicalls, -mno-abicalls 3055 3056Enable SVR4-style position-independent code (Mips only) 3057 3058.. option:: -mabs=<arg> 3059 3060.. option:: -mcheck-zero-division, -mno-check-zero-division 3061 3062.. option:: -mcompact-branches=<arg> 3063 3064.. option:: -mdouble-float 3065 3066.. option:: -mdsp, -mno-dsp 3067 3068.. option:: -mdspr2, -mno-dspr2 3069 3070.. option:: -membedded-data, -mno-embedded-data 3071 3072Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 3073 3074.. option:: -mextern-sdata, -mno-extern-sdata 3075 3076Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 3077 3078.. option:: -mfp32 3079 3080Use 32-bit floating point registers (MIPS only) 3081 3082.. option:: -mfp64 3083 3084Use 64-bit floating point registers (MIPS only) 3085 3086.. option:: -mginv, -mno-ginv 3087 3088.. option:: -mgpopt, -mno-gpopt 3089 3090Use GP relative accesses for symbols known to be in a small data section (MIPS) 3091 3092.. option:: -mindirect-jump=<arg> 3093 3094Change indirect jump instructions to inhibit speculation 3095 3096.. option:: -mips16 3097 3098.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 3099 3100.. option:: -mlocal-sdata, -mno-local-sdata 3101 3102Extend the -G behaviour to object local data (MIPS) 3103 3104.. option:: -mmadd4, -mno-madd4 3105 3106Enable the generation of 4-operand madd.s, madd.d and related instructions. 3107 3108.. option:: -mmicromips, -mno-micromips 3109 3110.. option:: -mmsa, -mno-msa 3111 3112Enable MSA ASE (MIPS only) 3113 3114.. option:: -mmt, -mno-mt 3115 3116Enable MT ASE (MIPS only) 3117 3118.. option:: -mnan=<arg> 3119 3120.. option:: -mno-mips16 3121 3122.. option:: -msingle-float 3123 3124.. option:: -mvirt, -mno-virt 3125 3126.. option:: -mxgot, -mno-xgot 3127 3128PowerPC 3129------- 3130.. option:: -maltivec, -mno-altivec 3131 3132.. option:: -mcmpb, -mno-cmpb 3133 3134.. option:: -mcrbits, -mno-crbits 3135 3136.. option:: -mcrypto, -mno-crypto 3137 3138.. option:: -mdirect-move, -mno-direct-move 3139 3140.. option:: -mfloat128, -mno-float128 3141 3142.. option:: -mfprnd, -mno-fprnd 3143 3144.. option:: -mhtm, -mno-htm 3145 3146.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 3147 3148.. option:: -misel, -mno-isel 3149 3150.. option:: -mlongcall, -mno-longcall 3151 3152.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 3153 3154.. option:: -mmma, -mno-mma 3155 3156.. option:: -mpaired-vector-memops, -mno-paired-vector-memops 3157 3158.. option:: -mpcrel, -mno-pcrel 3159 3160.. option:: -mpopcntd, -mno-popcntd 3161 3162.. option:: -mpower10-vector, -mno-power10-vector 3163 3164.. option:: -mpower8-vector, -mno-power8-vector 3165 3166.. option:: -mpower9-vector, -mno-power9-vector 3167 3168.. option:: -mqpx, -mno-qpx 3169 3170.. option:: -msecure-plt 3171 3172.. option:: -mspe, -mno-spe 3173 3174.. option:: -mvsx, -mno-vsx 3175 3176WebAssembly 3177----------- 3178.. option:: -matomics, -mno-atomics 3179 3180.. option:: -mbulk-memory, -mno-bulk-memory 3181 3182.. option:: -mexception-handling, -mno-exception-handling 3183 3184.. option:: -mmultivalue, -mno-multivalue 3185 3186.. option:: -mmutable-globals, -mno-mutable-globals 3187 3188.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 3189 3190.. option:: -mreference-types, -mno-reference-types 3191 3192.. option:: -msign-ext, -mno-sign-ext 3193 3194.. option:: -msimd128, -mno-simd128 3195 3196.. option:: -mtail-call, -mno-tail-call 3197 3198.. option:: -munimplemented-simd128, -mno-unimplemented-simd128 3199 3200WebAssembly Driver 3201------------------ 3202.. option:: -mexec-model=<arg> 3203 3204Execution model (WebAssembly only) 3205 3206X86 3207--- 3208.. option:: -m3dnow, -mno-3dnow 3209 3210.. option:: -m3dnowa, -mno-3dnowa 3211 3212.. option:: -madx, -mno-adx 3213 3214.. option:: -maes, -mno-aes 3215 3216.. option:: -mamx-bf16, -mno-amx-bf16 3217 3218.. option:: -mamx-int8, -mno-amx-int8 3219 3220.. option:: -mamx-tile, -mno-amx-tile 3221 3222.. option:: -mavx, -mno-avx 3223 3224.. option:: -mavx2, -mno-avx2 3225 3226.. option:: -mavx512bf16, -mno-avx512bf16 3227 3228.. option:: -mavx512bitalg, -mno-avx512bitalg 3229 3230.. option:: -mavx512bw, -mno-avx512bw 3231 3232.. option:: -mavx512cd, -mno-avx512cd 3233 3234.. option:: -mavx512dq, -mno-avx512dq 3235 3236.. option:: -mavx512er, -mno-avx512er 3237 3238.. option:: -mavx512f, -mno-avx512f 3239 3240.. option:: -mavx512ifma, -mno-avx512ifma 3241 3242.. option:: -mavx512pf, -mno-avx512pf 3243 3244.. option:: -mavx512vbmi, -mno-avx512vbmi 3245 3246.. option:: -mavx512vbmi2, -mno-avx512vbmi2 3247 3248.. option:: -mavx512vl, -mno-avx512vl 3249 3250.. option:: -mavx512vnni, -mno-avx512vnni 3251 3252.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 3253 3254.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 3255 3256.. option:: -mavxvnni, -mno-avxvnni 3257 3258.. option:: -mbmi, -mno-bmi 3259 3260.. option:: -mbmi2, -mno-bmi2 3261 3262.. option:: -mcldemote, -mno-cldemote 3263 3264.. option:: -mclflushopt, -mno-clflushopt 3265 3266.. option:: -mclwb, -mno-clwb 3267 3268.. option:: -mclzero, -mno-clzero 3269 3270.. option:: -mcx16, -mno-cx16 3271 3272.. option:: -menqcmd, -mno-enqcmd 3273 3274.. option:: -mf16c, -mno-f16c 3275 3276.. option:: -mfma, -mno-fma 3277 3278.. option:: -mfma4, -mno-fma4 3279 3280.. option:: -mfsgsbase, -mno-fsgsbase 3281 3282.. option:: -mfxsr, -mno-fxsr 3283 3284.. option:: -mgfni, -mno-gfni 3285 3286.. option:: -mhreset, -mno-hreset 3287 3288.. option:: -minvpcid, -mno-invpcid 3289 3290.. option:: -mkl, -mno-kl 3291 3292.. option:: -mlwp, -mno-lwp 3293 3294.. option:: -mlzcnt, -mno-lzcnt 3295 3296.. option:: -mmmx, -mno-mmx 3297 3298.. option:: -mmovbe, -mno-movbe 3299 3300.. option:: -mmovdir64b, -mno-movdir64b 3301 3302.. option:: -mmovdiri, -mno-movdiri 3303 3304.. option:: -mmwaitx, -mno-mwaitx 3305 3306.. option:: -mpclmul, -mno-pclmul 3307 3308.. option:: -mpconfig, -mno-pconfig 3309 3310.. option:: -mpku, -mno-pku 3311 3312.. option:: -mpopcnt, -mno-popcnt 3313 3314.. option:: -mprefetchwt1, -mno-prefetchwt1 3315 3316.. option:: -mprfchw, -mno-prfchw 3317 3318.. option:: -mptwrite, -mno-ptwrite 3319 3320.. option:: -mrdpid, -mno-rdpid 3321 3322.. option:: -mrdrnd, -mno-rdrnd 3323 3324.. option:: -mrdseed, -mno-rdseed 3325 3326.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 3327 3328.. option:: -mrtm, -mno-rtm 3329 3330.. option:: -msahf, -mno-sahf 3331 3332.. option:: -mserialize, -mno-serialize 3333 3334.. option:: -msgx, -mno-sgx 3335 3336.. option:: -msha, -mno-sha 3337 3338.. option:: -mshstk, -mno-shstk 3339 3340.. option:: -msse, -mno-sse 3341 3342.. option:: -msse2, -mno-sse2 3343 3344.. option:: -msse3, -mno-sse3 3345 3346.. option:: -msse4.1, -mno-sse4.1 3347 3348.. program:: clang1 3349.. option:: -msse4.2, -mno-sse4.2, -msse4 3350.. program:: clang 3351 3352.. option:: -msse4a, -mno-sse4a 3353 3354.. option:: -mssse3, -mno-ssse3 3355 3356.. option:: -mtbm, -mno-tbm 3357 3358.. option:: -mtsxldtrk, -mno-tsxldtrk 3359 3360.. option:: -muintr, -mno-uintr 3361 3362.. option:: -mvaes, -mno-vaes 3363 3364.. option:: -mvpclmulqdq, -mno-vpclmulqdq 3365 3366.. option:: -mvzeroupper, -mno-vzeroupper 3367 3368.. option:: -mwaitpkg, -mno-waitpkg 3369 3370.. option:: -mwbnoinvd, -mno-wbnoinvd 3371 3372.. option:: -mwidekl, -mno-widekl 3373 3374.. option:: -mx87, -m80387, -mno-x87 3375 3376.. option:: -mxop, -mno-xop 3377 3378.. option:: -mxsave, -mno-xsave 3379 3380.. option:: -mxsavec, -mno-xsavec 3381 3382.. option:: -mxsaveopt, -mno-xsaveopt 3383 3384.. option:: -mxsaves, -mno-xsaves 3385 3386RISCV 3387----- 3388.. option:: -msave-restore, -mno-save-restore 3389 3390Enable using library calls for save and restore 3391 3392Long double flags 3393----------------- 3394Selects the long double implementation 3395 3396.. option:: -mlong-double-128 3397 3398Force long double to be 128 bits 3399 3400.. option:: -mlong-double-64 3401 3402Force long double to be 64 bits 3403 3404.. option:: -mlong-double-80 3405 3406Force long double to be 80 bits, padded to 128 bits for storage 3407 3408Optimization level 3409~~~~~~~~~~~~~~~~~~ 3410 3411Flags controlling how much optimization should be performed. 3412 3413.. option:: -O<arg>, -O (equivalent to -O1), --optimize, --optimize=<arg> 3414 3415.. option:: -Ofast<arg> 3416 3417Debug information generation 3418~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3419 3420Flags controlling how much and what kind of debug information should be 3421generated. 3422 3423Kind and level of debug information 3424----------------------------------- 3425.. option:: -g, --debug, --debug=<arg> 3426 3427Generate source-level debug information 3428 3429.. option:: -gdwarf 3430 3431Generate source-level debug information with the default dwarf version 3432 3433.. option:: -gdwarf-2 3434 3435Generate source-level debug information with dwarf version 2 3436 3437.. option:: -gdwarf-3 3438 3439Generate source-level debug information with dwarf version 3 3440 3441.. option:: -gdwarf-4 3442 3443Generate source-level debug information with dwarf version 4 3444 3445.. option:: -gdwarf-5 3446 3447Generate source-level debug information with dwarf version 5 3448 3449.. option:: -gfull 3450 3451.. option:: -gused 3452 3453Debug level 3454___________ 3455.. option:: -g0 3456 3457.. option:: -g2 3458 3459.. option:: -g3 3460 3461.. option:: -ggdb0 3462 3463.. option:: -ggdb1 3464 3465.. option:: -ggdb2 3466 3467.. option:: -ggdb3 3468 3469.. option:: -gline-directives-only 3470 3471Emit debug line info directives only 3472 3473.. option:: -gline-tables-only, -g1, -gmlt 3474 3475Emit debug line number tables only 3476 3477.. option:: -gmodules 3478 3479Generate debug info with external references to clang modules or precompiled headers 3480 3481Debugger to tune debug information for 3482______________________________________ 3483.. option:: -ggdb 3484 3485.. option:: -glldb 3486 3487.. option:: -gsce 3488 3489Debug information flags 3490----------------------- 3491.. option:: -gcolumn-info, -gno-column-info 3492 3493.. option:: -gdwarf-aranges 3494 3495.. option:: -gembed-source, -gno-embed-source 3496 3497Embed source text in DWARF debug sections 3498 3499.. option:: -ggnu-pubnames, -gno-gnu-pubnames 3500 3501.. option:: -gpubnames, -gno-pubnames 3502 3503.. option:: -grecord-command-line, -gno-record-command-line, -grecord-gcc-switches 3504 3505.. option:: -gsplit-dwarf 3506 3507.. program:: clang1 3508.. option:: -gsplit-dwarf=<arg> 3509.. program:: clang 3510 3511Set DWARF fission mode to either 'split' or 'single' 3512 3513.. option:: -gstrict-dwarf, -gno-strict-dwarf 3514 3515.. option:: -gz=<arg>, -gz (equivalent to -gz=zlib) 3516 3517DWARF debug sections compression type 3518 3519Static analyzer flags 3520===================== 3521 3522Flags controlling the behavior of the Clang Static Analyzer. 3523 3524.. option:: -Xanalyzer <arg> 3525 3526Pass <arg> to the static analyzer 3527 3528Fortran compilation flags 3529========================= 3530 3531Flags that will be passed onto the ``gfortran`` compiler when Clang is given 3532a Fortran input. 3533 3534.. option:: -A<arg>, --assert <arg>, --assert=<arg> 3535 3536.. option:: -A-<arg> 3537 3538.. option:: -J<arg> 3539 3540.. option:: -cpp 3541 3542.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 3543 3544.. option:: -falign-commons, -fno-align-commons 3545 3546.. option:: -fall-intrinsics, -fno-all-intrinsics 3547 3548.. option:: -fautomatic, -fno-automatic 3549 3550.. option:: -fbackslash, -fno-backslash 3551 3552.. option:: -fbacktrace, -fno-backtrace 3553 3554.. option:: -fblas-matmul-limit=<arg> 3555 3556.. option:: -fbounds-check, -fno-bounds-check 3557 3558.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 3559 3560.. option:: -fcheck=<arg> 3561 3562.. option:: -fcoarray=<arg> 3563 3564.. option:: -fconvert=<arg> 3565 3566.. option:: -fcray-pointer, -fno-cray-pointer 3567 3568.. option:: -fd-lines-as-code, -fno-d-lines-as-code 3569 3570.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 3571 3572.. option:: -fdefault-double-8, -fno-default-double-8 3573 3574.. option:: -fdefault-integer-8, -fno-default-integer-8 3575 3576.. option:: -fdefault-real-8, -fno-default-real-8 3577 3578.. option:: -fdollar-ok, -fno-dollar-ok 3579 3580.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 3581 3582.. option:: -fdump-fortran-original, -fno-dump-fortran-original 3583 3584.. option:: -fdump-parse-tree, -fno-dump-parse-tree 3585 3586.. option:: -fexternal-blas, -fno-external-blas 3587 3588.. option:: -ff2c, -fno-f2c 3589 3590.. option:: -ffixed-form, -fno-fixed-form 3591 3592.. option:: -ffixed-line-length-<arg> 3593 3594.. option:: -ffpe-trap=<arg> 3595 3596.. option:: -ffree-form, -fno-free-form 3597 3598.. option:: -ffree-line-length-<arg> 3599 3600.. option:: -ffrontend-optimize, -fno-frontend-optimize 3601 3602.. option:: -fimplicit-none, -fno-implicit-none 3603 3604.. option:: -finit-character=<arg> 3605 3606.. option:: -finit-integer=<arg> 3607 3608.. option:: -finit-local-zero, -fno-init-local-zero 3609 3610.. option:: -finit-logical=<arg> 3611 3612.. option:: -finit-real=<arg> 3613 3614.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 3615 3616.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 3617 3618.. option:: -fmax-array-constructor=<arg> 3619 3620.. option:: -fmax-errors=<arg> 3621 3622.. option:: -fmax-identifier-length, -fno-max-identifier-length 3623 3624.. option:: -fmax-stack-var-size=<arg> 3625 3626.. option:: -fmax-subrecord-length=<arg> 3627 3628.. option:: -fmodule-private, -fno-module-private 3629 3630.. option:: -fpack-derived, -fno-pack-derived 3631 3632.. option:: -fprotect-parens, -fno-protect-parens 3633 3634.. option:: -frange-check, -fno-range-check 3635 3636.. option:: -freal-4-real-10, -fno-real-4-real-10 3637 3638.. option:: -freal-4-real-16, -fno-real-4-real-16 3639 3640.. option:: -freal-4-real-8, -fno-real-4-real-8 3641 3642.. option:: -freal-8-real-10, -fno-real-8-real-10 3643 3644.. option:: -freal-8-real-16, -fno-real-8-real-16 3645 3646.. option:: -freal-8-real-4, -fno-real-8-real-4 3647 3648.. option:: -frealloc-lhs, -fno-realloc-lhs 3649 3650.. option:: -frecord-marker=<arg> 3651 3652.. option:: -frecursive, -fno-recursive 3653 3654.. option:: -frepack-arrays, -fno-repack-arrays 3655 3656.. option:: -fsecond-underscore, -fno-second-underscore 3657 3658.. option:: -fsign-zero, -fno-sign-zero 3659 3660.. option:: -fstack-arrays, -fno-stack-arrays 3661 3662.. option:: -funderscoring, -fno-underscoring 3663 3664.. option:: -fwhole-file, -fno-whole-file 3665 3666.. option:: -imultilib <arg> 3667 3668.. option:: -nocpp 3669 3670.. option:: -static-libgfortran 3671 3672Linker flags 3673============ 3674Flags that are passed on to the linker 3675 3676.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 3677 3678Add directory to library search path 3679 3680.. option:: -Mach 3681 3682.. option:: -T<script> 3683 3684Specify <script> as linker script 3685 3686.. option:: -Tbss<addr> 3687 3688Set starting address of BSS to <addr> 3689 3690.. option:: -Tdata<addr> 3691 3692Set starting address of DATA to <addr> 3693 3694.. option:: -Ttext<addr> 3695 3696Set starting address of TEXT to <addr> 3697 3698.. option:: -Wl,<arg>,<arg2>... 3699 3700Pass the comma separated arguments in <arg> to the linker 3701 3702.. option:: -X 3703 3704.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 3705 3706Pass <arg> to the linker 3707 3708.. program:: clang1 3709.. option:: -Z 3710.. program:: clang 3711 3712.. option:: -coverage, --coverage 3713 3714.. option:: -e<arg>, --entry 3715 3716.. option:: -filelist <arg> 3717 3718.. option:: --hip-device-lib=<arg> 3719 3720HIP device library 3721 3722.. option:: -l<arg> 3723 3724.. option:: --ld-path=<arg> 3725 3726.. option:: -nostartfiles 3727 3728.. program:: clang1 3729.. option:: -nostdlib, --no-standard-libraries 3730.. program:: clang 3731 3732.. option:: -pie 3733 3734.. option:: -r 3735 3736.. option:: -rdynamic 3737 3738.. option:: --rocm-device-lib-path=<arg>, --hip-device-lib-path=<arg> 3739 3740ROCm device library path. Alternative to rocm-path. 3741 3742.. option:: -rpath <arg> 3743 3744.. option:: -s 3745 3746.. option:: -shared, --shared 3747 3748.. option:: -specs=<arg>, --specs=<arg> 3749 3750.. option:: -static, --static 3751 3752.. option:: -static-pie 3753 3754.. option:: -t 3755 3756.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3757 3758.. option:: -undef 3759 3760undef all system defines 3761 3762.. option:: -undefined<arg>, --no-undefined 3763 3764.. option:: -z <arg> 3765 3766Pass -z <arg> to the linker 3767 3768