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.. option:: -Xcuda-fatbinary <arg> 60 61Pass <arg> to fatbinary invocation 62 63.. option:: -Xcuda-ptxas <arg> 64 65Pass <arg> to the ptxas assembler 66 67.. option:: -Xopenmp-target <arg> 68 69Pass <arg> to the target offloading toolchain. 70 71.. program:: clang1 72.. option:: -Xopenmp-target=<triple> <arg> 73.. program:: clang 74 75Pass <arg> to the target offloading toolchain identified by <triple>. 76 77.. option:: -Z<arg> 78 79.. option:: -a<arg>, --profile-blocks 80 81.. option:: -all\_load 82 83.. option:: -allowable\_client <arg> 84 85.. option:: --analyze 86 87Run the static analyzer 88 89.. option:: --analyze-auto 90 91.. option:: --analyzer-no-default-checks 92 93.. option:: --analyzer-output<arg> 94 95Static analyzer report output format (html\|plist\|plist-multi-file\|plist-html\|text). 96 97.. option:: -ansi, --ansi 98 99.. option:: -arch <arg> 100 101.. program:: clang1 102.. option:: -arch\_errors\_fatal 103.. program:: clang 104 105.. program:: clang2 106.. option:: -arch\_only <arg> 107.. program:: clang 108 109.. option:: -arcmt-migrate-emit-errors 110 111Emit ARC errors even if the migrator can fix them 112 113.. option:: -arcmt-migrate-report-output <arg> 114 115Output path for the plist report 116 117.. option:: --autocomplete=<arg> 118 119.. option:: -bind\_at\_load 120 121.. option:: -bundle 122 123.. program:: clang1 124.. option:: -bundle\_loader <arg> 125.. program:: clang 126 127.. option:: -cfguard 128 129Emit tables required for Windows Control Flow Guard. 130 131.. option:: -client\_name<arg> 132 133.. option:: -compatibility\_version<arg> 134 135.. option:: --config <arg> 136 137Specifies configuration file 138 139.. option:: --constant-cfstrings 140 141.. option:: -coverage, --coverage 142 143.. option:: --cuda-compile-host-device 144 145Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. 146 147.. option:: --cuda-device-only 148 149Compile CUDA code for device only 150 151.. option:: --cuda-gpu-arch=<arg>, --no-cuda-gpu-arch=<arg> 152 153CUDA GPU architecture (e.g. sm\_35). May be specified more than once. 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:: -dumpmachine 180 181.. option:: -dumpversion 182 183.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 184 185.. option:: -dylib\_file <arg> 186 187.. option:: -dylinker 188 189.. program:: clang1 190.. option:: -dylinker\_install\_name<arg> 191.. program:: clang 192 193.. option:: -dynamic 194 195.. option:: -dynamiclib 196 197.. option:: -emit-ast 198 199Emit Clang AST files for source inputs 200 201.. option:: -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang<arg> 202 203Trivial 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 204 205.. option:: -exported\_symbols\_list <arg> 206 207.. option:: -faligned-new=<arg> 208 209.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 210 211Use approximate transcendental functions 212 213.. option:: -fcuda-flush-denormals-to-zero, -fno-cuda-flush-denormals-to-zero 214 215Flush denormal floating point values to zero in CUDA device mode. 216 217.. option:: -fcuda-short-ptr, -fno-cuda-short-ptr 218 219Use 32-bit pointers for accessing const/local/shared address spaces. 220 221.. option:: -ffixed-r19 222 223Reserve register r19 (Hexagon only) 224 225.. option:: -fgpu-rdc, -fcuda-rdc, -fno-gpu-rdc 226 227Generate relocatable device code, also known as separate compilation mode. 228 229.. option:: -fheinous-gnu-extensions 230 231.. option:: -flat\_namespace 232 233.. option:: -fopenmp-targets=<arg1>,<arg2>... 234 235Specify comma-separated list of triples OpenMP offloading targets to be supported 236 237.. option:: -force\_cpusubtype\_ALL 238 239.. program:: clang1 240.. option:: -force\_flat\_namespace 241.. program:: clang 242 243.. program:: clang2 244.. option:: -force\_load <arg> 245.. program:: clang 246 247.. option:: -framework <arg> 248 249.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 250 251Add -rpath with architecture-specific resource directory to the linker flags 252 253.. option:: --gcc-toolchain=<arg>, -gcc-toolchain <arg> 254 255Use the gcc toolchain at the given directory 256 257.. option:: -gcodeview 258 259Generate CodeView debug information 260 261.. option:: -gcodeview-ghash, -gno-codeview-ghash 262 263Emit type record hashes in a .debug$H section 264 265.. option:: -headerpad\_max\_install\_names<arg> 266 267.. option:: -help, --help 268 269Display available options 270 271.. option:: --help-hidden 272 273Display help for hidden options 274 275.. option:: --hip-link 276 277Link clang-offload-bundler bundles for HIP 278 279.. option:: -image\_base <arg> 280 281.. option:: -index-header-map 282 283Make the next included directory (-I or -F) an indexer header map 284 285.. option:: -init <arg> 286 287.. option:: -install\_name <arg> 288 289.. option:: -interface-stub-version=<arg> 290 291.. option:: -keep\_private\_externs 292 293.. option:: -lazy\_framework <arg> 294 295.. program:: clang1 296.. option:: -lazy\_library <arg> 297.. program:: clang 298 299.. option:: -mbig-endian, -EB 300 301.. option:: -mbranch-protection=<arg> 302 303Enforce targets of indirect branches and function returns 304 305.. option:: --migrate 306 307Run the migrator 308 309.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 310 311.. option:: -mlinker-version=<arg> 312 313.. option:: -mlittle-endian, -EL 314 315.. option:: -mllvm <arg> 316 317Additional arguments to forward to LLVM's option processing 318 319.. option:: -module-dependency-dir <arg> 320 321Directory to dump module dependencies to 322 323.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 324 325.. option:: -multi\_module 326 327.. option:: -multiply\_defined <arg> 328 329.. program:: clang1 330.. option:: -multiply\_defined\_unused <arg> 331.. program:: clang 332 333.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 334 335.. option:: --no-cuda-version-check 336 337Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 338 339.. option:: -no-integrated-cpp, --no-integrated-cpp 340 341.. option:: -no\_dead\_strip\_inits\_and\_terms 342 343.. option:: -nobuiltininc 344 345Disable builtin #include directories 346 347.. option:: -nocudainc 348 349.. option:: -nocudalib 350 351.. option:: -nodefaultlibs 352 353.. option:: -nofixprebinding 354 355.. option:: -nolibc 356 357.. option:: -nomultidefs 358 359.. option:: -nopie, -no-pie 360 361.. option:: -noprebind 362 363.. option:: -noprofilelib 364 365.. option:: -noseglinkedit 366 367.. option:: -nostartfiles 368 369.. option:: -nostdinc, --no-standard-includes 370 371.. program:: clang1 372.. option:: -nostdinc++ 373.. program:: clang 374 375Disable standard #include directories for the C++ standard library 376 377.. option:: -nostdlib, --no-standard-libraries 378 379.. program:: clang1 380.. option:: -nostdlib++ 381.. program:: clang 382 383.. option:: -nostdlibinc 384 385.. option:: -o<file>, --output <arg>, --output=<arg> 386 387Write output to <file> 388 389.. option:: -objcmt-atomic-property 390 391Make migration to 'atomic' properties 392 393.. option:: -objcmt-migrate-all 394 395Enable migration to modern ObjC 396 397.. option:: -objcmt-migrate-annotation 398 399Enable migration to property and method annotations 400 401.. option:: -objcmt-migrate-designated-init 402 403Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 404 405.. option:: -objcmt-migrate-instancetype 406 407Enable migration to infer instancetype for method result type 408 409.. option:: -objcmt-migrate-literals 410 411Enable migration to modern ObjC literals 412 413.. option:: -objcmt-migrate-ns-macros 414 415Enable migration to NS\_ENUM/NS\_OPTIONS macros 416 417.. option:: -objcmt-migrate-property 418 419Enable migration to modern ObjC property 420 421.. option:: -objcmt-migrate-property-dot-syntax 422 423Enable migration of setter/getter messages to property-dot syntax 424 425.. option:: -objcmt-migrate-protocol-conformance 426 427Enable migration to add protocol conformance on classes 428 429.. option:: -objcmt-migrate-readonly-property 430 431Enable migration to modern ObjC readonly property 432 433.. option:: -objcmt-migrate-readwrite-property 434 435Enable migration to modern ObjC readwrite property 436 437.. option:: -objcmt-migrate-subscripting 438 439Enable migration to modern ObjC subscripting 440 441.. option:: -objcmt-ns-nonatomic-iosonly 442 443Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 444 445.. option:: -objcmt-returns-innerpointer-property 446 447Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 448 449.. option:: -objcmt-whitelist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg> 450 451Only modify files with a filename contained in the provided directory path 452 453.. option:: -object 454 455.. option:: -p, --profile 456 457.. option:: -pagezero\_size<arg> 458 459.. option:: -pg 460 461Enable mcount instrumentation 462 463.. option:: -pie 464 465.. option:: -pipe, --pipe 466 467Use pipes between commands, when possible 468 469.. option:: -prebind 470 471.. program:: clang1 472.. option:: -prebind\_all\_twolevel\_modules 473.. program:: clang 474 475.. option:: -preload 476 477.. option:: --print-diagnostic-categories 478 479.. option:: -print-effective-triple, --print-effective-triple 480 481Print the effective target triple 482 483.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 484 485Print the full library path of <file> 486 487.. option:: -print-ivar-layout 488 489Enable Objective-C Ivar layout bitmap print trace 490 491.. option:: -print-libgcc-file-name, --print-libgcc-file-name 492 493Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 494 495.. option:: -print-multi-directory, --print-multi-directory 496 497.. option:: -print-multi-lib, --print-multi-lib 498 499.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 500 501Print the full program path of <name> 502 503.. option:: -print-resource-dir, --print-resource-dir 504 505Print the resource directory pathname 506 507.. option:: -print-search-dirs, --print-search-dirs 508 509Print the paths used for finding libraries and programs 510 511.. option:: -print-target-triple, --print-target-triple 512 513Print the normalized target triple 514 515.. option:: -private\_bundle 516 517.. option:: -pthread, -no-pthread 518 519Support POSIX threads in generated code 520 521.. option:: -pthreads 522 523.. option:: -rdynamic 524 525.. option:: -read\_only\_relocs <arg> 526 527.. option:: -relocatable-pch, --relocatable-pch 528 529Whether to build a relocatable precompiled header 530 531.. option:: -remap 532 533.. option:: -rewrite-legacy-objc 534 535Rewrite Legacy Objective-C source to C++ 536 537.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 538 539Compiler runtime library to use 540 541.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 542 543Save llvm statistics. 544 545.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 546 547Save intermediate compilation results. 548 549.. option:: -sectalign <arg1> <arg2> <arg3> 550 551.. option:: -sectcreate <arg1> <arg2> <arg3> 552 553.. option:: -sectobjectsymbols <arg1> <arg2> 554 555.. option:: -sectorder <arg1> <arg2> <arg3> 556 557.. option:: -seg1addr<arg> 558 559.. option:: -seg\_addr\_table <arg> 560 561.. program:: clang1 562.. option:: -seg\_addr\_table\_filename <arg> 563.. program:: clang 564 565.. option:: -segaddr <arg1> <arg2> 566 567.. option:: -segcreate <arg1> <arg2> <arg3> 568 569.. option:: -seglinkedit 570 571.. option:: -segprot <arg1> <arg2> <arg3> 572 573.. option:: -segs\_read\_<arg> 574 575.. program:: clang1 576.. option:: -segs\_read\_only\_addr <arg> 577.. program:: clang 578 579.. program:: clang2 580.. option:: -segs\_read\_write\_addr <arg> 581.. program:: clang 582 583.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 584 585Serialize compiler diagnostics to a file 586 587.. option:: -shared, --shared 588 589.. option:: -shared-libgcc 590 591.. option:: -shared-libsan, -shared-libasan 592 593Dynamically link the sanitizer runtime 594 595.. option:: -single\_module 596 597.. option:: -specs=<arg>, --specs=<arg> 598 599.. option:: -static, --static 600 601.. option:: -static-libgcc 602 603.. option:: -static-libsan 604 605Statically link the sanitizer runtime 606 607.. option:: -static-libstdc++ 608 609.. option:: -static-pie 610 611.. option:: -std-default=<arg> 612 613.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 614 615C++ standard library to use 616 617.. option:: -sub\_library<arg> 618 619.. program:: clang1 620.. option:: -sub\_umbrella<arg> 621.. program:: clang 622 623.. option:: --sysroot=<arg>, --sysroot <arg> 624 625.. option:: --target-help 626 627.. option:: --target=<arg>, -target <arg> 628 629Generate code for the given target 630 631.. option:: -time 632 633Time individual commands 634 635.. option:: -traditional, --traditional 636 637.. option:: -traditional-cpp, --traditional-cpp 638 639Enable some traditional CPP emulation 640 641.. option:: -twolevel\_namespace 642 643.. program:: clang1 644.. option:: -twolevel\_namespace\_hints 645.. program:: clang 646 647.. option:: -umbrella <arg> 648 649.. option:: -unexported\_symbols\_list <arg> 650 651.. option:: -unwindlib=<arg>, --unwindlib=<arg> 652 653Unwind library to use 654 655.. option:: -v, --verbose 656 657Show commands to run and use verbose output 658 659.. option:: --verify-debug-info 660 661Verify the binary representation of debug output 662 663.. option:: --version 664 665Print version information 666 667.. option:: -w, --no-warnings 668 669Suppress all warnings 670 671.. option:: -weak-l<arg> 672 673.. option:: -weak\_framework <arg> 674 675.. program:: clang1 676.. option:: -weak\_library <arg> 677.. program:: clang 678 679.. program:: clang2 680.. option:: -weak\_reference\_mismatches <arg> 681.. program:: clang 682 683.. option:: -whatsloaded 684 685.. option:: -whyload 686 687.. option:: -working-directory<arg>, -working-directory=<arg> 688 689Resolve file paths relative to the specified directory 690 691.. option:: -x<language>, --language <arg>, --language=<arg> 692 693Treat subsequent input files as having type <language> 694 695.. option:: -y<arg> 696 697Actions 698======= 699The action to perform on the input. 700 701.. option:: -E, --preprocess 702 703Only run the preprocessor 704 705.. option:: -S, --assemble 706 707Only run preprocess and compilation steps 708 709.. option:: -c, --compile 710 711Only run preprocess, compile, and assemble steps 712 713.. option:: -emit-interface-stubs 714 715Generate Inteface Stub Files. 716 717.. option:: -emit-llvm 718 719Use the LLVM representation for assembler and object files 720 721.. option:: -fsyntax-only 722 723.. option:: -module-file-info 724 725Provide information about a particular module file 726 727.. option:: --precompile 728 729Only precompile the input 730 731.. option:: -rewrite-objc 732 733Rewrite Objective-C source to C++ 734 735.. option:: -verify-pch 736 737Load and verify that a pre-compiled header file is not stale 738 739Compilation flags 740================= 741 742Flags controlling the behavior of Clang during compilation. These flags have 743no effect during actions that do not perform compilation. 744 745.. option:: -Xassembler <arg> 746 747Pass <arg> to the assembler 748 749.. option:: -Xclang <arg> 750 751Pass <arg> to the clang compiler 752 753.. option:: -fclang-abi-compat=<version> 754 755Attempt to match the ABI of Clang <version> 756 757.. option:: -fcomment-block-commands=<arg>,<arg2>... 758 759Treat each comma separated argument in <arg> as a documentation comment block command 760 761.. option:: -fcomplete-member-pointers, -fno-complete-member-pointers 762 763Require member pointer base types to be complete if they would be significant under the Microsoft ABI 764 765.. option:: -fcrash-diagnostics-dir=<arg> 766 767.. option:: -fdeclspec, -fno-declspec 768 769Allow \_\_declspec as a keyword 770 771.. option:: -fdepfile-entry=<arg> 772 773.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 774 775.. option:: -fdiagnostics-format=<arg> 776 777.. option:: -fdiagnostics-parseable-fixits 778 779Print fix-its in machine parseable form 780 781.. option:: -fdiagnostics-print-source-range-info 782 783Print source range spans in numeric form 784 785.. option:: -fdiagnostics-show-category=<arg> 786 787.. option:: -fdiscard-value-names, -fno-discard-value-names 788 789Discard value names in LLVM IR 790 791.. option:: -fexperimental-isel, -fno-experimental-isel 792 793Enables the experimental global instruction selector 794 795.. option:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager 796 797Enables an experimental new pass manager in LLVM. 798 799.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 800 801Use separate accesses for consecutive bitfield runs with legal widths and alignments. 802 803.. option:: -finline-functions, -fno-inline-functions 804 805Inline suitable functions 806 807.. option:: -finline-hint-functions 808 809Inline functions which are (explicitly or implicitly) marked inline 810 811.. option:: -fno-crash-diagnostics 812 813Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 814 815.. option:: -fno-sanitize-blacklist 816 817Don't use blacklist file for sanitizers 818 819.. option:: -fparse-all-comments 820 821.. option:: -frecord-command-line, -fno-record-command-line, -frecord-gcc-switches 822 823.. option:: -fsanitize-address-field-padding=<arg> 824 825Level of field padding for AddressSanitizer 826 827.. option:: -fsanitize-address-globals-dead-stripping 828 829Enable linker dead stripping of globals in AddressSanitizer 830 831.. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 832 833Enable poisoning array cookies when using custom operator new\[\] in AddressSanitizer 834 835.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 836 837Enable use-after-scope detection in AddressSanitizer 838 839.. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator 840 841Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size 842 843.. option:: -fsanitize-blacklist=<arg> 844 845Path to blacklist file for sanitizers 846 847.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 848 849Enable control flow integrity (CFI) checks for cross-DSO calls. 850 851.. option:: -fsanitize-cfi-icall-generalize-pointers 852 853Generalize pointers in CFI indirect call type signature checks 854 855.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 856 857Specify the type of coverage instrumentation for Sanitizers 858 859.. option:: -fsanitize-hwaddress-abi=<arg> 860 861Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor) 862 863.. option:: -fsanitize-link-c++-runtime 864 865.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 866 867Enable origins tracking in MemorySanitizer 868 869.. program:: clang1 870.. option:: -fsanitize-memory-track-origins=<arg> 871.. program:: clang 872 873Enable origins tracking in MemorySanitizer 874 875.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 876 877Enable use-after-destroy detection in MemorySanitizer 878 879.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 880 881.. option:: -fsanitize-recover, -fno-sanitize-recover 882 883.. program:: clang1 884.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>... 885.. program:: clang 886 887Enable recovery for specified sanitizers 888 889.. option:: -fsanitize-stats, -fno-sanitize-stats 890 891Enable sanitizer statistics gathering. 892 893.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 894 895Enable atomic operations instrumentation in ThreadSanitizer (default) 896 897.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 898 899Enable function entry/exit instrumentation in ThreadSanitizer (default) 900 901.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 902 903Enable memory access instrumentation in ThreadSanitizer (default) 904 905.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>... 906 907Enable trapping for specified sanitizers 908 909.. option:: -fsanitize-undefined-strip-path-components=<number> 910 911Strip (or keep only, if negative) a given number of path components when emitting check metadata. 912 913.. option:: -fsanitize-undefined-trap-on-error, -fno-sanitize-undefined-trap-on-error 914 915.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 916 917Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 918 919.. option:: -moutline, -mno-outline 920 921Enable function outlining (AArch64 only) 922 923.. option:: --param <arg>, --param=<arg> 924 925.. option:: -print-supported-cpus, --print-supported-cpus, -mcpu=?, -mtune=? 926 927Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target) 928 929.. option:: -std=<arg>, --std=<arg>, --std <arg> 930 931Language standard to compile for 932 933Preprocessor flags 934~~~~~~~~~~~~~~~~~~ 935 936Flags controlling the behavior of the Clang preprocessor. 937 938.. option:: -C, --comments 939 940Include comments in preprocessed output 941 942.. option:: -CC, --comments-in-macros 943 944Include comments from within macros in preprocessed output 945 946.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 947 948Define <macro> to <value> (or 1 if <value> omitted) 949 950.. option:: -H, --trace-includes 951 952Show header includes and nesting depth 953 954.. option:: -P, --no-line-commands 955 956Disable linemarker output in -E mode 957 958.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 959 960Undefine macro <macro> 961 962.. option:: -Wp,<arg>,<arg2>... 963 964Pass the comma separated arguments in <arg> to the preprocessor 965 966.. option:: -Xpreprocessor <arg> 967 968Pass <arg> to the preprocessor 969 970Include path management 971----------------------- 972 973Flags controlling how ``#include``\s are resolved to files. 974 975.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 976 977Add directory to include search path 978 979.. option:: -I-, --include-barrier 980 981Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 982 983.. option:: --cuda-path-ignore-env 984 985Ignore environment variables to detect CUDA installation 986 987.. option:: --cuda-path=<arg> 988 989CUDA installation path 990 991.. option:: -cxx-isystem<directory> 992 993Add directory to the C++ SYSTEM include search path 994 995.. option:: -fbuild-session-file=<file> 996 997Use the last modification time of <file> as the build session timestamp 998 999.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 1000 1001Time when the current build session started 1002 1003.. option:: -fmodule-file=\[<name>=\]<file> 1004 1005Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 1006 1007.. option:: -fmodules-cache-path=<directory> 1008 1009Specify the module cache path 1010 1011.. option:: -fmodules-disable-diagnostic-validation 1012 1013Disable validation of the diagnostic options when loading the module 1014 1015.. option:: -fmodules-prune-after=<seconds> 1016 1017Specify the interval (in seconds) after which a module file will be considered unused 1018 1019.. option:: -fmodules-prune-interval=<seconds> 1020 1021Specify the interval (in seconds) between attempts to prune the module cache 1022 1023.. option:: -fmodules-user-build-path <directory> 1024 1025Specify the module user build path 1026 1027.. option:: -fmodules-validate-once-per-build-session 1028 1029Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 1030 1031.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 1032 1033Validate the system headers that a module depends on when loading the module 1034 1035.. option:: -fprebuilt-module-path=<directory> 1036 1037Specify the prebuilt module path 1038 1039.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1040 1041Add directory to AFTER include search path 1042 1043.. option:: -iframework<arg> 1044 1045Add directory to SYSTEM framework search path 1046 1047.. option:: -iframeworkwithsysroot<directory> 1048 1049Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1050 1051.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1052 1053Include macros from file before parsing 1054 1055.. option:: -include<file>, --include<file>, --include=<arg> 1056 1057Include file before parsing 1058 1059.. option:: -include-pch <file> 1060 1061Include precompiled header file 1062 1063.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1064 1065Set the -iwithprefix/-iwithprefixbefore prefix 1066 1067.. option:: -iquote<directory> 1068 1069Add directory to QUOTE include search path 1070 1071.. option:: -isysroot<dir> 1072 1073Set the system root directory (usually /) 1074 1075.. option:: -isystem<directory> 1076 1077Add directory to SYSTEM include search path 1078 1079.. option:: -isystem-after<directory> 1080 1081Add directory to end of the SYSTEM include search path 1082 1083.. option:: -ivfsoverlay<arg> 1084 1085Overlay the virtual filesystem described by file over the real file system 1086 1087.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1088 1089Set directory to SYSTEM include search path with prefix 1090 1091.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1092 1093Set directory to include search path with prefix 1094 1095.. option:: -iwithsysroot<directory> 1096 1097Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1098 1099.. option:: --libomptarget-nvptx-path=<arg> 1100 1101Path to libomptarget-nvptx libraries 1102 1103.. option:: --ptxas-path=<arg> 1104 1105Path to ptxas (used for compiling CUDA code) 1106 1107.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1108 1109Treat all #include paths starting with <prefix> as including a system header. 1110 1111Dependency file generation 1112-------------------------- 1113 1114Flags controlling generation of a dependency file for ``make``-like build 1115systems. 1116 1117.. option:: -M, --dependencies 1118 1119Like -MD, but also implies -E and writes to stdout by default 1120 1121.. option:: -MD, --write-dependencies 1122 1123Write a depfile containing user and system headers 1124 1125.. option:: -MF<file> 1126 1127Write depfile output from -MMD, -MD, -MM, or -M to <file> 1128 1129.. option:: -MG, --print-missing-file-dependencies 1130 1131Add missing headers to depfile 1132 1133.. option:: -MJ<arg> 1134 1135Write a compilation database entry per input 1136 1137.. option:: -MM, --user-dependencies 1138 1139Like -MMD, but also implies -E and writes to stdout by default 1140 1141.. option:: -MMD, --write-user-dependencies 1142 1143Write a depfile containing user headers 1144 1145.. option:: -MP 1146 1147Create phony target for each dependency (other than main file) 1148 1149.. option:: -MQ<arg> 1150 1151Specify name of main file output to quote in depfile 1152 1153.. option:: -MT<arg> 1154 1155Specify name of main file output in depfile 1156 1157.. option:: -MV 1158 1159Use NMake/Jom format for the depfile 1160 1161Dumping preprocessor state 1162-------------------------- 1163 1164Flags allowing the state of the preprocessor to be dumped in various ways. 1165 1166.. option:: -d 1167 1168.. program:: clang1 1169.. option:: -d<arg> 1170.. program:: clang 1171 1172.. option:: -dA 1173 1174.. option:: -dD 1175 1176Print macro definitions in -E mode in addition to normal output 1177 1178.. option:: -dI 1179 1180Print include directives in -E mode in addition to normal output 1181 1182.. option:: -dM 1183 1184Print macro definitions in -E mode instead of normal output 1185 1186Diagnostic flags 1187~~~~~~~~~~~~~~~~ 1188 1189Flags controlling which warnings, errors, and remarks Clang will generate. 1190See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1191 1192.. option:: -R<remark> 1193 1194Enable the specified remark 1195 1196.. option:: -Rpass-analysis=<arg> 1197 1198Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1199 1200.. option:: -Rpass-missed=<arg> 1201 1202Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1203 1204.. option:: -Rpass=<arg> 1205 1206Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1207 1208.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1209 1210Enable the specified warning 1211 1212.. option:: -Wdeprecated, -Wno-deprecated 1213 1214Enable warnings for deprecated constructs and define \_\_DEPRECATED 1215 1216.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1217 1218Target-independent compilation options 1219~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1220.. option:: -Wframe-larger-than=<arg> 1221 1222.. option:: -fPIC, -fno-PIC 1223 1224.. option:: -fPIE, -fno-PIE 1225 1226.. option:: -faccess-control, -fno-access-control 1227 1228.. option:: -faddrsig, -fno-addrsig 1229 1230Emit an address-significance table 1231 1232.. option:: -falign-functions, -fno-align-functions 1233 1234.. program:: clang1 1235.. option:: -falign-functions=<arg> 1236.. program:: clang 1237 1238.. program:: clang1 1239.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1240.. program:: clang 1241 1242Enable C++17 aligned allocation functions 1243 1244.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1245 1246Treat editor placeholders as valid source code 1247 1248.. option:: -fallow-unsupported 1249 1250.. option:: -faltivec, -fno-altivec 1251 1252.. option:: -fansi-escape-codes 1253 1254Use ANSI escape codes for diagnostics 1255 1256.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1257 1258Use Apple's kernel extensions ABI 1259 1260.. option:: -fapple-link-rtlib 1261 1262Force linking the clang builtins runtime library 1263 1264.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1265 1266Enable Apple gcc-compatible #pragma pack handling 1267 1268.. option:: -fapplication-extension, -fno-application-extension 1269 1270Restrict code to those available for App Extensions 1271 1272.. option:: -fasm, -fno-asm 1273 1274.. option:: -fasm-blocks, -fno-asm-blocks 1275 1276.. option:: -fassociative-math, -fno-associative-math 1277 1278.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1279 1280.. option:: -fast 1281 1282.. option:: -fastcp 1283 1284.. option:: -fastf 1285 1286.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1287 1288.. option:: -fautolink, -fno-autolink 1289 1290.. option:: -fblocks, -fno-blocks 1291 1292Enable the 'blocks' language feature 1293 1294.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1295 1296.. option:: -fborland-extensions, -fno-borland-extensions 1297 1298Accept non-standard constructs supported by the Borland compiler 1299 1300.. option:: -fbracket-depth=<arg> 1301 1302.. option:: -fbuiltin, -fno-builtin 1303 1304.. option:: -fbuiltin-module-map 1305 1306Load the clang builtins module map file. 1307 1308.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1309 1310Enable C++ static destructor registration (the default) 1311 1312.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1313 1314.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1315 1316Instrument control-flow architecture protection. Options: return, branch, full, none. 1317 1318.. option:: -fcf-runtime-abi=<arg> 1319 1320.. option:: -fchar8\_t, -fno-char8\_t 1321 1322Enable C++ builtin type char8\_t 1323 1324.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1325 1326.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1327 1328Use colors in diagnostics 1329 1330.. option:: -fcommon, -fno-common 1331 1332.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1333 1334.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1335 1336.. option:: -fconstant-string-class=<arg> 1337 1338.. option:: -fconstexpr-backtrace-limit=<arg> 1339 1340.. option:: -fconstexpr-depth=<arg> 1341 1342.. option:: -fconstexpr-steps=<arg> 1343 1344.. option:: -fcoroutines-ts, -fno-coroutines-ts 1345 1346Enable support for the C++ Coroutines TS 1347 1348.. option:: -fcoverage-mapping, -fno-coverage-mapping 1349 1350Generate coverage mapping to enable code coverage analysis 1351 1352.. option:: -fcreate-profile 1353 1354.. option:: -fcs-profile-generate 1355 1356Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1357 1358.. program:: clang1 1359.. option:: -fcs-profile-generate=<directory> 1360.. program:: clang 1361 1362Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1363 1364.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1365 1366Enable C++ exceptions 1367 1368.. option:: -fcxx-modules, -fno-cxx-modules 1369 1370.. option:: -fdata-sections, -fno-data-sections 1371 1372Place each data in its own section (ELF Only) 1373 1374.. option:: -fdebug-compilation-dir <arg> 1375 1376The compilation directory to embed in the debug info. 1377 1378.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1379 1380Emit extra debug info to make sample profile more accurate. 1381 1382.. option:: -fdebug-macro, -fno-debug-macro 1383 1384Emit macro debug information 1385 1386.. option:: -fdebug-pass-arguments 1387 1388.. option:: -fdebug-pass-structure 1389 1390.. option:: -fdebug-prefix-map=<arg> 1391 1392remap file source paths in debug info 1393 1394.. option:: -fdebug-ranges-base-address, -fno-debug-ranges-base-address 1395 1396Use DWARF base address selection entries in debug\_ranges 1397 1398.. option:: -fdebug-types-section, -fno-debug-types-section 1399 1400Place debug types in their own section (ELF Only) 1401 1402.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1403 1404Parse templated function definitions at the end of the translation unit 1405 1406.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1407 1408Treat usage of null pointers as undefined behavior. 1409 1410.. option:: -fdenormal-fp-math=<arg> 1411 1412.. option:: -fdiagnostics-absolute-paths 1413 1414Print absolute paths in diagnostics 1415 1416.. option:: -fdiagnostics-color, -fno-diagnostics-color 1417 1418.. program:: clang1 1419.. option:: -fdiagnostics-color=<arg> 1420.. program:: clang 1421 1422.. option:: -fdiagnostics-hotness-threshold=<number> 1423 1424Prevent optimization remarks from being output if they do not have at least this profile count 1425 1426.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1427 1428Enable profile hotness information in diagnostic line 1429 1430.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1431 1432Display include stacks for diagnostic notes 1433 1434.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1435 1436Print option name with mappable diagnostics 1437 1438.. option:: -fdiagnostics-show-template-tree 1439 1440Print a template comparison tree for differing templates 1441 1442.. option:: -fdigraphs, -fno-digraphs 1443 1444Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1445 1446.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1447 1448Allow '$' in identifiers 1449 1450.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1451 1452Enable '\[\[\]\]' attributes in all C and C++ language modes 1453 1454.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1455 1456.. option:: -fdwarf-exceptions 1457 1458Use DWARF style exceptions 1459 1460.. option:: -felide-constructors, -fno-elide-constructors 1461 1462.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1463 1464.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1465 1466Embed LLVM bitcode (option: off, all, bitcode, marker) 1467 1468.. option:: -femit-all-decls 1469 1470Emit all declarations, even if unused 1471 1472.. option:: -femulated-tls, -fno-emulated-tls 1473 1474Use emutls functions to access thread\_local variables 1475 1476.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1477 1478.. option:: -ferror-limit=<arg> 1479 1480.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1481 1482.. option:: -fexceptions, -fno-exceptions 1483 1484Enable support for exception handling 1485 1486.. option:: -fexec-charset=<arg> 1487 1488.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1489 1490.. option:: -ffast-math, -fno-fast-math 1491 1492Allow aggressive, lossy floating-point optimizations 1493 1494.. option:: -ffinite-math-only, -fno-finite-math-only 1495 1496.. option:: -ffixed-point, -fno-fixed-point 1497 1498Enable fixed point types 1499 1500.. option:: -ffor-scope, -fno-for-scope 1501 1502.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1503 1504Emits more virtual tables to improve devirtualization 1505 1506.. option:: -fforce-enable-int128, -fno-force-enable-int128 1507 1508Enable support for int128\_t type 1509 1510.. option:: -ffp-contract=<arg> 1511 1512Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma, default) \| off (never fuse) 1513 1514.. option:: -ffreestanding 1515 1516Assert that the compilation takes place in a freestanding environment 1517 1518.. option:: -ffunction-sections, -fno-function-sections 1519 1520Place each function in its own section (ELF Only) 1521 1522.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1523 1524.. option:: -fgnu-keywords, -fno-gnu-keywords 1525 1526Allow GNU-extension keywords regardless of language standard 1527 1528.. option:: -fgnu-runtime 1529 1530Generate output compatible with the standard GNU Objective-C runtime 1531 1532.. option:: -fgnu89-inline, -fno-gnu89-inline 1533 1534Use the gnu89 inline semantics 1535 1536.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1537 1538.. option:: -fhonor-nans, -fno-honor-nans 1539 1540.. option:: -fhosted 1541 1542.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1543 1544Implicitly search the file system for module map files. 1545 1546.. option:: -fimplicit-modules, -fno-implicit-modules 1547 1548.. option:: -finput-charset=<arg> 1549 1550.. option:: -finstrument-function-entry-bare 1551 1552Instrument function entry only, after inlining, without arguments to the instrumentation call 1553 1554.. option:: -finstrument-functions 1555 1556Generate calls to instrument function entry and exit 1557 1558.. option:: -finstrument-functions-after-inlining 1559 1560Like -finstrument-functions, but insert the calls after inlining 1561 1562.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1563 1564Enable the integrated assembler 1565 1566.. option:: -fjump-tables, -fno-jump-tables 1567 1568.. option:: -fkeep-static-consts 1569 1570Keep static const variables even if unused 1571 1572.. option:: -flax-vector-conversions, -fno-lax-vector-conversions 1573 1574.. option:: -flimited-precision=<arg> 1575 1576.. option:: -flto, -fno-lto 1577 1578Enable LTO in 'full' mode 1579 1580.. option:: -flto-jobs=<arg> 1581 1582Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1583 1584.. program:: clang1 1585.. option:: -flto=<arg> 1586.. program:: clang 1587 1588Set LTO mode to either 'full' or 'thin' 1589 1590.. option:: -fmacro-backtrace-limit=<arg> 1591 1592.. option:: -fmath-errno, -fno-math-errno 1593 1594Require math functions to indicate errors by setting errno 1595 1596.. option:: -fmax-type-align=<arg> 1597 1598Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1599 1600.. option:: -fmerge-all-constants, -fno-merge-all-constants 1601 1602Allow merging of constants 1603 1604.. option:: -fmessage-length=<arg> 1605 1606.. option:: -fmodule-file-deps, -fno-module-file-deps 1607 1608.. option:: -fmodule-map-file=<file> 1609 1610Load this module map file 1611 1612.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1613 1614Specify the name of the module to build 1615 1616.. option:: -fmodules, -fno-modules 1617 1618Enable the 'modules' language feature 1619 1620.. option:: -fmodules-decluse, -fno-modules-decluse 1621 1622Require declaration of modules used within a module 1623 1624.. option:: -fmodules-ignore-macro=<arg> 1625 1626Ignore the definition of the given macro when building and loading modules 1627 1628.. option:: -fmodules-search-all, -fno-modules-search-all 1629 1630Search even non-imported modules to resolve references 1631 1632.. option:: -fmodules-strict-decluse 1633 1634Like -fmodules-decluse but requires all headers to be in modules 1635 1636.. option:: -fmodules-ts 1637 1638Enable support for the C++ Modules TS 1639 1640.. option:: -fms-compatibility, -fno-ms-compatibility 1641 1642Enable full Microsoft Visual C++ compatibility 1643 1644.. option:: -fms-compatibility-version=<arg> 1645 1646Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1647 1648.. option:: -fms-extensions, -fno-ms-extensions 1649 1650Accept some non-standard constructs supported by the Microsoft compiler 1651 1652.. option:: -fms-memptr-rep=<arg> 1653 1654.. option:: -fms-volatile<arg> 1655 1656.. option:: -fmsc-version=<arg> 1657 1658Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1659 1660.. option:: -fmudflap 1661 1662.. option:: -fmudflapth 1663 1664.. option:: -fnested-functions 1665 1666.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1667 1668Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1669 1670.. option:: -fnext-runtime 1671 1672.. option:: -fno-builtin-<arg> 1673 1674Disable implicit builtin knowledge of a specific function 1675 1676.. option:: -fno-elide-type 1677 1678Do not elide types when printing diagnostics 1679 1680.. option:: -fno-max-type-align 1681 1682.. option:: -fno-operator-names 1683 1684Do not treat C++ operator name keywords as synonyms for operators 1685 1686.. option:: -fno-rtti-data 1687 1688Control emission of RTTI data 1689 1690.. option:: -fno-strict-modules-decluse 1691 1692.. option:: -fno-working-directory 1693 1694.. option:: -fnoxray-link-deps 1695 1696.. option:: -fobjc-abi-version=<arg> 1697 1698.. option:: -fobjc-arc, -fno-objc-arc 1699 1700Synthesize retain and release calls for Objective-C pointers 1701 1702.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1703 1704Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1705 1706.. option:: -fobjc-convert-messages-to-runtime-calls, -fno-objc-convert-messages-to-runtime-calls 1707 1708.. option:: -fobjc-exceptions, -fno-objc-exceptions 1709 1710Enable Objective-C exceptions 1711 1712.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1713 1714.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1715 1716.. option:: -fobjc-link-runtime 1717 1718.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1719 1720.. option:: -fobjc-nonfragile-abi-version=<arg> 1721 1722.. option:: -fobjc-runtime=<arg> 1723 1724Specify the target Objective-C runtime kind and version 1725 1726.. option:: -fobjc-sender-dependent-dispatch 1727 1728.. option:: -fobjc-weak, -fno-objc-weak 1729 1730Enable ARC-style weak references in Objective-C 1731 1732.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1733 1734.. option:: -fopenmp, -fno-openmp 1735 1736Parse OpenMP pragmas and generate parallel code. 1737 1738.. option:: -fopenmp-simd, -fno-openmp-simd 1739 1740Emit OpenMP code only for SIMD-based constructs. 1741 1742.. option:: -fopenmp-version=<arg> 1743 1744.. program:: clang1 1745.. option:: -fopenmp=<arg> 1746.. program:: clang 1747 1748.. option:: -foperator-arrow-depth=<arg> 1749 1750.. option:: -foptimization-record-file=<arg> 1751 1752Specify the file name of any generated YAML optimization record 1753 1754.. option:: -foptimization-record-passes=<arg> 1755 1756Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes) 1757 1758.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1759 1760.. option:: -forder-file-instrumentation 1761 1762Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1763 1764.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1765 1766.. option:: -fpack-struct, -fno-pack-struct 1767 1768.. program:: clang1 1769.. option:: -fpack-struct=<arg> 1770.. program:: clang 1771 1772Specify the default maximum struct packing alignment 1773 1774.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1775 1776Recognize and construct Pascal-style string literals 1777 1778.. option:: -fpass-plugin=<dsopath> 1779 1780Load pass plugin from a dynamic shared object file (only with new pass manager). 1781 1782.. option:: -fpcc-struct-return 1783 1784Override the default ABI to return all structs on the stack 1785 1786.. option:: -fpch-preprocess 1787 1788.. option:: -fpic, -fno-pic 1789 1790.. option:: -fpie, -fno-pie 1791 1792.. option:: -fplt, -fno-plt 1793 1794Use the PLT to make function calls 1795 1796.. option:: -fplugin=<dsopath> 1797 1798Load the named plugin (dynamic shared object) 1799 1800.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1801 1802.. option:: -fprofile-arcs, -fno-profile-arcs 1803 1804.. option:: -fprofile-dir=<arg> 1805 1806.. option:: -fprofile-exclude-files=<arg> 1807 1808Instrument only functions from files where names don't match all the regexes separated by a semi-colon 1809 1810.. option:: -fprofile-filter-files=<arg> 1811 1812Instrument only functions from files where names match any regex separated by a semi-colon 1813 1814.. option:: -fprofile-generate, -fno-profile-generate 1815 1816Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1817 1818.. program:: clang1 1819.. option:: -fprofile-generate=<directory> 1820.. program:: clang 1821 1822Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1823 1824.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1825 1826Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1827 1828.. program:: clang1 1829.. option:: -fprofile-instr-generate=<file> 1830.. program:: clang 1831 1832Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 1833 1834.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 1835 1836.. program:: clang1 1837.. option:: -fprofile-instr-use=<arg> 1838.. program:: clang 1839 1840Use instrumentation data for profile-guided optimization 1841 1842.. option:: -fprofile-remapping-file=<file>, -fprofile-remapping-file <arg> 1843 1844Use the remappings described in <file> to match the profile data against names in the program 1845 1846.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 1847 1848Specifies that the sample profile is accurate. If the sample 1849 profile is accurate, callsites without profile samples are marked 1850 as cold. Otherwise, treat callsites without profile samples as if 1851 we have no profile 1852 1853.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 1854 1855.. program:: clang1 1856.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 1857.. program:: clang 1858 1859Enable sample-based profile guided optimizations 1860 1861.. program:: clang1 1862.. option:: -fprofile-use=<pathname> 1863.. program:: clang 1864 1865Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 1866 1867.. option:: -freciprocal-math, -fno-reciprocal-math 1868 1869Allow division operations to be reassociated 1870 1871.. option:: -freg-struct-return 1872 1873Override the default ABI to return small structs in registers 1874 1875.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 1876 1877Use atexit or \_\_cxa\_atexit to register global destructors 1878 1879.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 1880 1881Enable C++17 relaxed template template argument matching 1882 1883.. option:: -freroll-loops, -fno-reroll-loops 1884 1885Turn on loop reroller 1886 1887.. option:: -fretain-comments-from-system-headers 1888 1889.. option:: -frewrite-imports, -fno-rewrite-imports 1890 1891.. option:: -frewrite-includes, -fno-rewrite-includes 1892 1893.. option:: -frewrite-map-file <arg> 1894 1895.. program:: clang1 1896.. option:: -frewrite-map-file=<arg> 1897.. program:: clang 1898 1899.. option:: -fropi, -fno-ropi 1900 1901.. option:: -frtti, -fno-rtti 1902 1903.. option:: -frwpi, -fno-rwpi 1904 1905.. option:: -fsave-optimization-record, -fno-save-optimization-record 1906 1907Generate a YAML optimization record file 1908 1909.. program:: clang1 1910.. option:: -fsave-optimization-record=<arg> 1911.. program:: clang 1912 1913Generate an optimization record file in a specific format (default: YAML) 1914 1915.. option:: -fseh-exceptions 1916 1917Use SEH style exceptions 1918 1919.. option:: -fshort-enums, -fno-short-enums 1920 1921Allocate to an enum type only as many bytes as it needs for the declared range of possible values 1922 1923.. option:: -fshort-wchar, -fno-short-wchar 1924 1925Force wchar\_t to be a short unsigned int 1926 1927.. option:: -fshow-column, -fno-show-column 1928 1929.. option:: -fshow-overloads=<arg> 1930 1931Which overload candidates to show when overload resolution fails: best\|all; defaults to all 1932 1933.. option:: -fshow-source-location, -fno-show-source-location 1934 1935.. option:: -fsignaling-math, -fno-signaling-math 1936 1937.. option:: -fsigned-bitfields 1938 1939.. option:: -fsigned-char, -fno-signed-char, --signed-char 1940 1941.. option:: -fsigned-zeros, -fno-signed-zeros 1942 1943.. option:: -fsized-deallocation, -fno-sized-deallocation 1944 1945Enable C++14 sized global deallocation functions 1946 1947.. option:: -fsjlj-exceptions 1948 1949Use SjLj style exceptions 1950 1951.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 1952 1953Enable the superword-level parallelism vectorization passes 1954 1955.. option:: -fspell-checking, -fno-spell-checking 1956 1957.. option:: -fspell-checking-limit=<arg> 1958 1959.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 1960 1961Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 1962 1963.. option:: -fsplit-lto-unit, -fno-split-lto-unit 1964 1965Enables splitting of the LTO unit. 1966 1967.. option:: -fsplit-stack 1968 1969.. option:: -fstack-protector, -fno-stack-protector 1970 1971Enable 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 1972 1973.. option:: -fstack-protector-all 1974 1975Enable stack protectors for all functions 1976 1977.. option:: -fstack-protector-strong 1978 1979Enable 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 1980 1981.. option:: -fstack-size-section, -fno-stack-size-section 1982 1983Emit section containing metadata on function stack sizes 1984 1985.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 1986 1987Emit full debug info for all types used by the program 1988 1989.. option:: -fstrict-aliasing, -fno-strict-aliasing 1990 1991.. option:: -fstrict-enums, -fno-strict-enums 1992 1993Enable optimizations based on the strict definition of an enum's value range 1994 1995.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 1996 1997Assume that overflowing float-to-int casts are undefined (default) 1998 1999.. option:: -fstrict-overflow, -fno-strict-overflow 2000 2001.. option:: -fstrict-return, -fno-strict-return 2002 2003Always treat control flow paths that fall off the end of a non-void function as unreachable 2004 2005.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 2006 2007Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 2008 2009.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 2010 2011.. option:: -fsymbol-partition=<arg> 2012 2013.. option:: -ftabstop=<arg> 2014 2015.. option:: -ftemplate-backtrace-limit=<arg> 2016 2017.. option:: -ftemplate-depth-<arg> 2018 2019.. option:: -ftemplate-depth=<arg> 2020 2021.. option:: -ftest-coverage 2022 2023.. option:: -fthinlto-index=<arg> 2024 2025Perform ThinLTO importing using provided function summary index 2026 2027.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 2028 2029.. option:: -ftime-report 2030 2031.. option:: -ftime-trace 2032 2033.. option:: -ftls-model=<arg> 2034 2035.. option:: -ftrap-function=<arg> 2036 2037Issue call to specified function rather than a trap instruction 2038 2039.. option:: -ftrapping-math, -fno-trapping-math 2040 2041.. option:: -ftrapv 2042 2043Trap on integer overflow 2044 2045.. option:: -ftrapv-handler <arg> 2046 2047.. program:: clang1 2048.. option:: -ftrapv-handler=<function name> 2049.. program:: clang 2050 2051Specify the function to be called on overflow 2052 2053.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 2054 2055Process trigraph sequences 2056 2057.. option:: -ftrivial-auto-var-init=<arg> 2058 2059Initialize trivial automatic stack variables: uninitialized (default) \| pattern 2060 2061.. option:: -funique-section-names, -fno-unique-section-names 2062 2063Use unique names for text and data sections (ELF Only) 2064 2065.. option:: -funit-at-a-time, -fno-unit-at-a-time 2066 2067.. option:: -funroll-loops, -fno-unroll-loops 2068 2069Turn on loop unroller 2070 2071.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 2072 2073.. option:: -funsigned-bitfields 2074 2075.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 2076 2077.. option:: -funwind-tables, -fno-unwind-tables 2078 2079.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 2080 2081.. option:: -fuse-init-array, -fno-use-init-array 2082 2083Use .init\_array instead of .ctors 2084 2085.. option:: -fuse-ld=<arg> 2086 2087.. option:: -fuse-line-directives, -fno-use-line-directives 2088 2089.. option:: -fveclib=<arg> 2090 2091Use the given vector functions library 2092 2093.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2094 2095Enable the loop vectorization passes 2096 2097.. option:: -fverbose-asm, -fno-verbose-asm 2098 2099.. option:: -fvisibility-global-new-delete-hidden 2100 2101Give global C++ operator new and delete declarations hidden visibility 2102 2103.. option:: -fvisibility-inlines-hidden 2104 2105Give inline C++ member functions hidden visibility by default 2106 2107.. option:: -fvisibility-ms-compat 2108 2109Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2110 2111.. option:: -fvisibility=<arg> 2112 2113Set the default symbol visibility for all global declarations 2114 2115.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2116 2117Enables whole-program vtable optimization. Requires -flto 2118 2119.. option:: -fwrapv, -fno-wrapv 2120 2121Treat signed integer overflow as two's complement 2122 2123.. option:: -fwritable-strings 2124 2125Store string literals as writable data 2126 2127.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2128 2129Determine whether to always emit \_\_xray\_customevent(...) calls even if the function it appears in is not always instrumented. 2130 2131.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2132 2133Determine whether to always emit \_\_xray\_typedevent(...) calls even if the function it appears in is not always instrumented. 2134 2135.. option:: -fxray-always-instrument=<arg> 2136 2137DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2138 2139.. option:: -fxray-attr-list=<arg> 2140 2141Filename defining the list of functions/types for imbuing XRay attributes. 2142 2143.. option:: -fxray-instruction-threshold<arg> 2144 2145.. program:: clang1 2146.. option:: -fxray-instruction-threshold=<arg> 2147.. program:: clang 2148 2149Sets the minimum function size to instrument with XRay 2150 2151.. option:: -fxray-instrument, -fno-xray-instrument 2152 2153Generate XRay instrumentation sleds on function entry and exit 2154 2155.. option:: -fxray-instrumentation-bundle=<arg> 2156 2157Select which XRay instrumentation points to emit. Options: all, none, function, custom. Default is 'all'. 2158 2159.. option:: -fxray-link-deps 2160 2161Tells clang to add the link dependencies for XRay. 2162 2163.. option:: -fxray-modes=<arg> 2164 2165List of modes to link in by default into XRay instrumented binaries. 2166 2167.. option:: -fxray-never-instrument=<arg> 2168 2169DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2170 2171.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2172 2173.. option:: -fzvector, -fno-zvector, -mzvector 2174 2175Enable System z vector language extension 2176 2177.. option:: -mlong-double-128 2178 2179Force long double to be 128 bits 2180 2181.. option:: -mlong-double-64 2182 2183Force long double to be 64 bits 2184 2185.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2186 2187.. option:: -pedantic-errors, --pedantic-errors 2188 2189OpenCL flags 2190------------ 2191.. option:: -cl-denorms-are-zero 2192 2193OpenCL only. Allow denormals to be flushed to zero. 2194 2195.. option:: -cl-fast-relaxed-math 2196 2197OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2198 2199.. option:: -cl-finite-math-only 2200 2201OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2202 2203.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2204 2205OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2206 2207.. option:: -cl-kernel-arg-info 2208 2209OpenCL only. Generate kernel argument metadata. 2210 2211.. option:: -cl-mad-enable 2212 2213OpenCL only. Allow use of less precise MAD computations in the generated binary. 2214 2215.. option:: -cl-no-signed-zeros 2216 2217OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2218 2219.. option:: -cl-opt-disable 2220 2221OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2222 2223.. option:: -cl-single-precision-constant 2224 2225OpenCL only. Treat double precision floating-point constant as single precision constant. 2226 2227.. option:: -cl-std=<arg> 2228 2229OpenCL language standard to compile for. 2230 2231.. option:: -cl-strict-aliasing 2232 2233OpenCL only. This option is added for compatibility with OpenCL 1.0. 2234 2235.. option:: -cl-uniform-work-group-size 2236 2237OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2238 2239.. option:: -cl-unsafe-math-optimizations 2240 2241OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2242 2243Target-dependent compilation options 2244~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2245.. option:: -G<size>, -G=<arg>, -msmall-data-threshold=<arg> 2246 2247Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2248 2249.. option:: -m16 2250 2251.. option:: -m32 2252 2253.. option:: -m64 2254 2255.. option:: -mabi=<arg> 2256 2257.. option:: -malign-double 2258 2259Align doubles to two words in structs (x86 only) 2260 2261.. option:: -march=<arg> 2262 2263.. option:: -masm=<arg> 2264 2265.. option:: -mbackchain, -mno-backchain 2266 2267Link stack frames through backchain on System Z 2268 2269.. option:: -mcmodel=<arg> 2270 2271.. option:: -mconsole<arg> 2272 2273.. program:: clang1 2274.. 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) 2275.. program:: clang 2276 2277.. option:: -mcrc, -mno-crc 2278 2279Allow use of CRC instructions (ARM/Mips only) 2280 2281.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2282 2283.. option:: -mdll<arg> 2284 2285.. option:: -mdynamic-no-pic<arg> 2286 2287.. option:: -meabi <arg> 2288 2289Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2290 2291.. option:: -mfentry 2292 2293Insert calls to fentry at function entry (x86 only) 2294 2295.. option:: -mfloat-abi=<arg> 2296 2297.. option:: -mfpmath=<arg> 2298 2299.. option:: -mfpu=<arg> 2300 2301.. option:: -mglobal-merge, -mno-global-merge 2302 2303Enable merging of globals 2304 2305.. option:: -mhard-float 2306 2307.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2308 2309.. option:: -mhwmult=<arg> 2310 2311.. option:: -miamcu, -mno-iamcu 2312 2313Use Intel MCU ABI 2314 2315.. option:: -mimplicit-float, -mno-implicit-float 2316 2317.. option:: -mimplicit-it=<arg> 2318 2319.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2320 2321(integrated-as) Emit an object file which can be used with an incremental linker 2322 2323.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2324 2325.. option:: -mkernel 2326 2327.. option:: -mlong-calls, -mno-long-calls 2328 2329Generate branches with extended addressability, usually via indirect jumps. 2330 2331.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2332 2333Set Mac OS X deployment target 2334 2335.. option:: -mmcu=<arg> 2336 2337.. option:: -mms-bitfields, -mno-ms-bitfields 2338 2339Set the default structure layout to be compatible with the Microsoft compiler standard 2340 2341.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2342 2343Omit frame pointer setup for leaf functions 2344 2345.. option:: -moslib=<arg> 2346 2347.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2348 2349Use copy relocations support for PIE builds 2350 2351.. option:: -mprefer-vector-width=<arg> 2352 2353Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2354 2355.. option:: -mqdsp6-compat 2356 2357Enable hexagon-qdsp6 backward compatibility 2358 2359.. option:: -mrecip 2360 2361.. program:: clang1 2362.. option:: -mrecip=<arg1>,<arg2>... 2363.. program:: clang 2364 2365.. option:: -mred-zone, -mno-red-zone 2366 2367.. option:: -mregparm=<arg> 2368 2369.. option:: -mrelax-all, -mno-relax-all 2370 2371(integrated-as) Relax all machine instructions 2372 2373.. option:: -mretpoline, -mno-retpoline 2374 2375.. option:: -mrtd, -mno-rtd 2376 2377Make StdCall calling convention the default 2378 2379.. option:: -msign-return-address=<arg> 2380 2381Select return address signing scope 2382 2383.. option:: -msoft-float, -mno-soft-float 2384 2385Use software floating point 2386 2387.. option:: -mspeculative-load-hardening, -mno-speculative-load-hardening 2388 2389.. option:: -mstack-alignment=<arg> 2390 2391Set the stack alignment 2392 2393.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2394 2395Enable stack probes 2396 2397.. option:: -mstack-probe-size=<arg> 2398 2399Set the stack probe size 2400 2401.. option:: -mstackrealign, -mno-stackrealign 2402 2403Force realign the stack at entry to every function 2404 2405.. option:: -mthread-model <arg> 2406 2407The thread model to use, e.g. posix, single (posix by default) 2408 2409.. option:: -mthreads<arg> 2410 2411.. option:: -mthumb, -mno-thumb 2412 2413.. option:: -mtls-direct-seg-refs, -mno-tls-direct-seg-refs 2414 2415Enable direct TLS access through segment registers (default) 2416 2417.. program:: clang1 2418.. option:: -mtune=<arg> 2419.. program:: clang 2420 2421.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2422 2423.. option:: -municode<arg> 2424 2425.. option:: -mvx, -mno-vx 2426 2427.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2428 2429.. option:: -mwatchos-version-min=<arg> 2430 2431.. option:: -mwavefrontsize64, -mno-wavefrontsize64 2432 2433Wavefront size 64 is used 2434 2435.. option:: -mwindows<arg> 2436 2437.. option:: -mx32 2438 2439AARCH64 2440------- 2441.. option:: -fcall-saved-x10 2442 2443Make the x10 register call-saved (AArch64 only) 2444 2445.. option:: -fcall-saved-x11 2446 2447Make the x11 register call-saved (AArch64 only) 2448 2449.. option:: -fcall-saved-x12 2450 2451Make the x12 register call-saved (AArch64 only) 2452 2453.. option:: -fcall-saved-x13 2454 2455Make the x13 register call-saved (AArch64 only) 2456 2457.. option:: -fcall-saved-x14 2458 2459Make the x14 register call-saved (AArch64 only) 2460 2461.. option:: -fcall-saved-x15 2462 2463Make the x15 register call-saved (AArch64 only) 2464 2465.. option:: -fcall-saved-x18 2466 2467Make the x18 register call-saved (AArch64 only) 2468 2469.. option:: -fcall-saved-x8 2470 2471Make the x8 register call-saved (AArch64 only) 2472 2473.. option:: -fcall-saved-x9 2474 2475Make the x9 register call-saved (AArch64 only) 2476 2477.. option:: -ffixed-x1 2478 2479Reserve the 1 register (AArch64 only) 2480 2481.. option:: -ffixed-x10 2482 2483Reserve the 10 register (AArch64 only) 2484 2485.. option:: -ffixed-x11 2486 2487Reserve the 11 register (AArch64 only) 2488 2489.. option:: -ffixed-x12 2490 2491Reserve the 12 register (AArch64 only) 2492 2493.. option:: -ffixed-x13 2494 2495Reserve the 13 register (AArch64 only) 2496 2497.. option:: -ffixed-x14 2498 2499Reserve the 14 register (AArch64 only) 2500 2501.. option:: -ffixed-x15 2502 2503Reserve the 15 register (AArch64 only) 2504 2505.. option:: -ffixed-x18 2506 2507Reserve the 18 register (AArch64 only) 2508 2509.. option:: -ffixed-x2 2510 2511Reserve the 2 register (AArch64 only) 2512 2513.. option:: -ffixed-x20 2514 2515Reserve the 20 register (AArch64 only) 2516 2517.. option:: -ffixed-x21 2518 2519Reserve the 21 register (AArch64 only) 2520 2521.. option:: -ffixed-x22 2522 2523Reserve the 22 register (AArch64 only) 2524 2525.. option:: -ffixed-x23 2526 2527Reserve the 23 register (AArch64 only) 2528 2529.. option:: -ffixed-x24 2530 2531Reserve the 24 register (AArch64 only) 2532 2533.. option:: -ffixed-x25 2534 2535Reserve the 25 register (AArch64 only) 2536 2537.. option:: -ffixed-x26 2538 2539Reserve the 26 register (AArch64 only) 2540 2541.. option:: -ffixed-x27 2542 2543Reserve the 27 register (AArch64 only) 2544 2545.. option:: -ffixed-x28 2546 2547Reserve the 28 register (AArch64 only) 2548 2549.. option:: -ffixed-x3 2550 2551Reserve the 3 register (AArch64 only) 2552 2553.. option:: -ffixed-x4 2554 2555Reserve the 4 register (AArch64 only) 2556 2557.. option:: -ffixed-x5 2558 2559Reserve the 5 register (AArch64 only) 2560 2561.. option:: -ffixed-x6 2562 2563Reserve the 6 register (AArch64 only) 2564 2565.. option:: -ffixed-x7 2566 2567Reserve the 7 register (AArch64 only) 2568 2569.. option:: -ffixed-x9 2570 2571Reserve the 9 register (AArch64 only) 2572 2573.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2574 2575Workaround Cortex-A53 erratum 835769 (AArch64 only) 2576 2577.. option:: -mgeneral-regs-only 2578 2579Generate code which only uses the general purpose registers (AArch64 only) 2580 2581AMDGPU 2582------ 2583.. option:: -mcode-object-v3, -mno-code-object-v3 2584 2585Enable code object v3 (AMDGPU only) 2586 2587.. option:: -mcumode, -mno-cumode 2588 2589CU wavefront execution mode is used (AMDGPU only) 2590 2591.. option:: -msram-ecc, -mno-sram-ecc 2592 2593Enable SRAM ECC (AMDGPU only) 2594 2595.. option:: -mxnack, -mno-xnack 2596 2597Enable XNACK (AMDGPU only) 2598 2599ARM 2600--- 2601.. option:: -ffixed-r9 2602 2603Reserve the r9 register (ARM only) 2604 2605.. option:: -mcmse 2606 2607Allow use of CMSE (Armv8-M Security Extensions) 2608 2609.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2610 2611Disallow generation of data access to code sections (ARM only) 2612 2613.. option:: -mno-movt 2614 2615Disallow use of movt/movw pairs (ARM only) 2616 2617.. option:: -mno-neg-immediates 2618 2619Disallow converting instructions with negative immediates to their negation or inversion. 2620 2621.. option:: -mnocrc 2622 2623Disallow use of CRC instructions (ARM only) 2624 2625.. option:: -mrestrict-it, -mno-restrict-it 2626 2627Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 2628 2629.. option:: -mtp=<arg> 2630 2631Thread pointer access method (AArch32/AArch64 only) 2632 2633.. option:: -munaligned-access, -mno-unaligned-access 2634 2635Allow memory accesses to be unaligned (AArch32/AArch64 only) 2636 2637Hexagon 2638------- 2639.. option:: -mieee-rnd-near 2640 2641.. option:: -mmemops, -mno-memops 2642 2643Enable generation of memop instructions 2644 2645.. option:: -mnvj, -mno-nvj 2646 2647Enable generation of new-value jumps 2648 2649.. option:: -mnvs, -mno-nvs 2650 2651Enable generation of new-value stores 2652 2653.. option:: -mpackets, -mno-packets 2654 2655Enable generation of instruction packets 2656 2657Hexagon 2658------- 2659.. option:: -mhvx, -mno-hvx 2660 2661Enable Hexagon Vector eXtensions 2662 2663.. option:: -mhvx-length=<arg> 2664 2665Set Hexagon Vector Length 2666 2667.. program:: clang1 2668.. option:: -mhvx=<arg> 2669.. program:: clang 2670 2671Enable Hexagon Vector eXtensions 2672 2673MIPS 2674---- 2675.. option:: -mabicalls, -mno-abicalls 2676 2677Enable SVR4-style position-independent code (Mips only) 2678 2679.. option:: -mabs=<arg> 2680 2681.. option:: -mcheck-zero-division, -mno-check-zero-division 2682 2683.. option:: -mcompact-branches=<arg> 2684 2685.. option:: -mdouble-float 2686 2687.. option:: -mdsp, -mno-dsp 2688 2689.. option:: -mdspr2, -mno-dspr2 2690 2691.. option:: -membedded-data, -mno-embedded-data 2692 2693Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 2694 2695.. option:: -mextern-sdata, -mno-extern-sdata 2696 2697Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 2698 2699.. option:: -mfp32 2700 2701Use 32-bit floating point registers (MIPS only) 2702 2703.. option:: -mfp64 2704 2705Use 64-bit floating point registers (MIPS only) 2706 2707.. option:: -mginv, -mno-ginv 2708 2709.. option:: -mgpopt, -mno-gpopt 2710 2711Use GP relative accesses for symbols known to be in a small data section (MIPS) 2712 2713.. option:: -mindirect-jump=<arg> 2714 2715Change indirect jump instructions to inhibit speculation 2716 2717.. option:: -mips16 2718 2719.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 2720 2721.. option:: -mlocal-sdata, -mno-local-sdata 2722 2723Extend the -G behaviour to object local data (MIPS) 2724 2725.. option:: -mmadd4, -mno-madd4 2726 2727Enable the generation of 4-operand madd.s, madd.d and related instructions. 2728 2729.. option:: -mmicromips, -mno-micromips 2730 2731.. option:: -mmsa, -mno-msa 2732 2733Enable MSA ASE (MIPS only) 2734 2735.. option:: -mmt, -mno-mt 2736 2737Enable MT ASE (MIPS only) 2738 2739.. option:: -mnan=<arg> 2740 2741.. option:: -mno-mips16 2742 2743.. option:: -msingle-float 2744 2745.. option:: -mvirt, -mno-virt 2746 2747.. option:: -mxgot, -mno-xgot 2748 2749PowerPC 2750------- 2751.. option:: -maltivec, -mno-altivec 2752 2753.. option:: -mcmpb, -mno-cmpb 2754 2755.. option:: -mcrbits, -mno-crbits 2756 2757.. option:: -mcrypto, -mno-crypto 2758 2759.. option:: -mdirect-move, -mno-direct-move 2760 2761.. option:: -mfloat128, -mno-float128 2762 2763.. option:: -mfprnd, -mno-fprnd 2764 2765.. option:: -mhtm, -mno-htm 2766 2767.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 2768 2769.. option:: -misel, -mno-isel 2770 2771.. option:: -mlongcall, -mno-longcall 2772 2773.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 2774 2775.. option:: -mpopcntd, -mno-popcntd 2776 2777.. option:: -mpower8-vector, -mno-power8-vector 2778 2779.. option:: -mpower9-vector, -mno-power9-vector 2780 2781.. option:: -mqpx, -mno-qpx 2782 2783.. option:: -msecure-plt 2784 2785.. option:: -mvsx, -mno-vsx 2786 2787WebAssembly 2788----------- 2789.. option:: -matomics, -mno-atomics 2790 2791.. option:: -mbulk-memory, -mno-bulk-memory 2792 2793.. option:: -mexception-handling, -mno-exception-handling 2794 2795.. option:: -mmultivalue, -mno-multivalue 2796 2797.. option:: -mmutable-globals, -mno-mutable-globals 2798 2799.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 2800 2801.. option:: -msign-ext, -mno-sign-ext 2802 2803.. option:: -msimd128, -mno-simd128 2804 2805.. option:: -mtail-call, -mno-tail-call 2806 2807.. option:: -munimplemented-simd128, -mno-unimplemented-simd128 2808 2809X86 2810--- 2811.. option:: -m3dnow, -mno-3dnow 2812 2813.. option:: -m3dnowa, -mno-3dnowa 2814 2815.. option:: -madx, -mno-adx 2816 2817.. option:: -maes, -mno-aes 2818 2819.. option:: -mavx, -mno-avx 2820 2821.. option:: -mavx2, -mno-avx2 2822 2823.. option:: -mavx512bf16, -mno-avx512bf16 2824 2825.. option:: -mavx512bitalg, -mno-avx512bitalg 2826 2827.. option:: -mavx512bw, -mno-avx512bw 2828 2829.. option:: -mavx512cd, -mno-avx512cd 2830 2831.. option:: -mavx512dq, -mno-avx512dq 2832 2833.. option:: -mavx512er, -mno-avx512er 2834 2835.. option:: -mavx512f, -mno-avx512f 2836 2837.. option:: -mavx512ifma, -mno-avx512ifma 2838 2839.. option:: -mavx512pf, -mno-avx512pf 2840 2841.. option:: -mavx512vbmi, -mno-avx512vbmi 2842 2843.. option:: -mavx512vbmi2, -mno-avx512vbmi2 2844 2845.. option:: -mavx512vl, -mno-avx512vl 2846 2847.. option:: -mavx512vnni, -mno-avx512vnni 2848 2849.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 2850 2851.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 2852 2853.. option:: -mbmi, -mno-bmi 2854 2855.. option:: -mbmi2, -mno-bmi2 2856 2857.. option:: -mcldemote, -mno-cldemote 2858 2859.. option:: -mclflushopt, -mno-clflushopt 2860 2861.. option:: -mclwb, -mno-clwb 2862 2863.. option:: -mclzero, -mno-clzero 2864 2865.. option:: -mcx16, -mno-cx16 2866 2867.. option:: -menqcmd, -mno-enqcmd 2868 2869.. option:: -mf16c, -mno-f16c 2870 2871.. option:: -mfma, -mno-fma 2872 2873.. option:: -mfma4, -mno-fma4 2874 2875.. option:: -mfsgsbase, -mno-fsgsbase 2876 2877.. option:: -mfxsr, -mno-fxsr 2878 2879.. option:: -mgfni, -mno-gfni 2880 2881.. option:: -minvpcid, -mno-invpcid 2882 2883.. option:: -mlwp, -mno-lwp 2884 2885.. option:: -mlzcnt, -mno-lzcnt 2886 2887.. option:: -mmmx, -mno-mmx 2888 2889.. option:: -mmovbe, -mno-movbe 2890 2891.. option:: -mmovdir64b, -mno-movdir64b 2892 2893.. option:: -mmovdiri, -mno-movdiri 2894 2895.. option:: -mmpx, -mno-mpx 2896 2897.. option:: -mmwaitx, -mno-mwaitx 2898 2899.. option:: -mpclmul, -mno-pclmul 2900 2901.. option:: -mpconfig, -mno-pconfig 2902 2903.. option:: -mpku, -mno-pku 2904 2905.. option:: -mpopcnt, -mno-popcnt 2906 2907.. option:: -mprefetchwt1, -mno-prefetchwt1 2908 2909.. option:: -mprfchw, -mno-prfchw 2910 2911.. option:: -mptwrite, -mno-ptwrite 2912 2913.. option:: -mrdpid, -mno-rdpid 2914 2915.. option:: -mrdrnd, -mno-rdrnd 2916 2917.. option:: -mrdseed, -mno-rdseed 2918 2919.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 2920 2921.. option:: -mrtm, -mno-rtm 2922 2923.. option:: -msahf, -mno-sahf 2924 2925.. option:: -msgx, -mno-sgx 2926 2927.. option:: -msha, -mno-sha 2928 2929.. option:: -mshstk, -mno-shstk 2930 2931.. option:: -msse, -mno-sse 2932 2933.. option:: -msse2, -mno-sse2 2934 2935.. option:: -msse3, -mno-sse3 2936 2937.. option:: -msse4.1, -mno-sse4.1 2938 2939.. program:: clang1 2940.. option:: -msse4.2, -mno-sse4.2, -msse4 2941.. program:: clang 2942 2943.. option:: -msse4a, -mno-sse4a 2944 2945.. option:: -mssse3, -mno-ssse3 2946 2947.. option:: -mtbm, -mno-tbm 2948 2949.. option:: -mvaes, -mno-vaes 2950 2951.. option:: -mvpclmulqdq, -mno-vpclmulqdq 2952 2953.. option:: -mwaitpkg, -mno-waitpkg 2954 2955.. option:: -mwbnoinvd, -mno-wbnoinvd 2956 2957.. option:: -mx87, -m80387, -mno-x87 2958 2959.. option:: -mxop, -mno-xop 2960 2961.. option:: -mxsave, -mno-xsave 2962 2963.. option:: -mxsavec, -mno-xsavec 2964 2965.. option:: -mxsaveopt, -mno-xsaveopt 2966 2967.. option:: -mxsaves, -mno-xsaves 2968 2969RISCV 2970----- 2971.. option:: -mrelax, -mno-relax 2972 2973Enable linker relaxation 2974 2975.. option:: -msave-restore, -mno-save-restore 2976 2977Enable using library calls for save and restore 2978 2979Optimization level 2980~~~~~~~~~~~~~~~~~~ 2981 2982Flags controlling how much optimization should be performed. 2983 2984.. option:: -O<arg>, -O (equivalent to -O2), --optimize, --optimize=<arg> 2985 2986.. option:: -Ofast<arg> 2987 2988Debug information generation 2989~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2990 2991Flags controlling how much and what kind of debug information should be 2992generated. 2993 2994Kind and level of debug information 2995----------------------------------- 2996.. option:: -g, --debug, --debug=<arg> 2997 2998Generate source-level debug information 2999 3000.. option:: -gdwarf-2 3001 3002Generate source-level debug information with dwarf version 2 3003 3004.. option:: -gdwarf-3 3005 3006Generate source-level debug information with dwarf version 3 3007 3008.. option:: -gdwarf-4, -gdwarf 3009 3010Generate source-level debug information with dwarf version 4 3011 3012.. option:: -gdwarf-5 3013 3014Generate source-level debug information with dwarf version 5 3015 3016.. option:: -gfull 3017 3018.. option:: -gused 3019 3020Debug level 3021___________ 3022.. option:: -g0 3023 3024.. option:: -g2 3025 3026.. option:: -g3 3027 3028.. option:: -ggdb0 3029 3030.. option:: -ggdb1 3031 3032.. option:: -ggdb2 3033 3034.. option:: -ggdb3 3035 3036.. option:: -gline-directives-only 3037 3038Emit debug line info directives only 3039 3040.. option:: -gline-tables-only, -g1, -gmlt 3041 3042Emit debug line number tables only 3043 3044.. option:: -gmodules 3045 3046Generate debug info with external references to clang modules or precompiled headers 3047 3048Debugger to tune debug information for 3049______________________________________ 3050.. option:: -ggdb 3051 3052.. option:: -glldb 3053 3054.. option:: -gsce 3055 3056Debug information flags 3057----------------------- 3058.. option:: -gcolumn-info, -gno-column-info 3059 3060.. option:: -gdwarf-aranges 3061 3062.. option:: -gembed-source, -gno-embed-source 3063 3064Embed source text in DWARF debug sections 3065 3066.. option:: -ggnu-pubnames, -gno-gnu-pubnames 3067 3068.. option:: -gpubnames, -gno-pubnames 3069 3070.. option:: -grecord-command-line, -gno-record-command-line, -grecord-gcc-switches 3071 3072.. option:: -gsplit-dwarf 3073 3074.. program:: clang1 3075.. option:: -gsplit-dwarf=<arg> 3076.. program:: clang 3077 3078Set DWARF fission mode to either 'split' or 'single' 3079 3080.. option:: -gstrict-dwarf, -gno-strict-dwarf 3081 3082.. option:: -gz 3083 3084DWARF debug sections compression type 3085 3086.. program:: clang1 3087.. option:: -gz=<arg> 3088.. program:: clang 3089 3090DWARF debug sections compression type 3091 3092Static analyzer flags 3093===================== 3094 3095Flags controlling the behavior of the Clang Static Analyzer. 3096 3097.. option:: -Xanalyzer <arg> 3098 3099Pass <arg> to the static analyzer 3100 3101Fortran compilation flags 3102========================= 3103 3104Flags that will be passed onto the ``gfortran`` compiler when Clang is given 3105a Fortran input. 3106 3107.. option:: -A<arg>, --assert <arg>, --assert=<arg> 3108 3109.. option:: -A-<arg> 3110 3111.. option:: -J<arg> 3112 3113.. option:: -cpp 3114 3115.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 3116 3117.. option:: -falign-commons, -fno-align-commons 3118 3119.. option:: -fall-intrinsics, -fno-all-intrinsics 3120 3121.. option:: -fautomatic, -fno-automatic 3122 3123.. option:: -fbackslash, -fno-backslash 3124 3125.. option:: -fbacktrace, -fno-backtrace 3126 3127.. option:: -fblas-matmul-limit=<arg> 3128 3129.. option:: -fbounds-check, -fno-bounds-check 3130 3131.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 3132 3133.. option:: -fcheck=<arg> 3134 3135.. option:: -fcoarray=<arg> 3136 3137.. option:: -fconvert=<arg> 3138 3139.. option:: -fcray-pointer, -fno-cray-pointer 3140 3141.. option:: -fd-lines-as-code, -fno-d-lines-as-code 3142 3143.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 3144 3145.. option:: -fdefault-double-8, -fno-default-double-8 3146 3147.. option:: -fdefault-integer-8, -fno-default-integer-8 3148 3149.. option:: -fdefault-real-8, -fno-default-real-8 3150 3151.. option:: -fdollar-ok, -fno-dollar-ok 3152 3153.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 3154 3155.. option:: -fdump-fortran-original, -fno-dump-fortran-original 3156 3157.. option:: -fdump-parse-tree, -fno-dump-parse-tree 3158 3159.. option:: -fexternal-blas, -fno-external-blas 3160 3161.. option:: -ff2c, -fno-f2c 3162 3163.. option:: -ffixed-form, -fno-fixed-form 3164 3165.. option:: -ffixed-line-length-<arg> 3166 3167.. option:: -ffpe-trap=<arg> 3168 3169.. option:: -ffree-form, -fno-free-form 3170 3171.. option:: -ffree-line-length-<arg> 3172 3173.. option:: -ffrontend-optimize, -fno-frontend-optimize 3174 3175.. option:: -fimplicit-none, -fno-implicit-none 3176 3177.. option:: -finit-character=<arg> 3178 3179.. option:: -finit-integer=<arg> 3180 3181.. option:: -finit-local-zero, -fno-init-local-zero 3182 3183.. option:: -finit-logical=<arg> 3184 3185.. option:: -finit-real=<arg> 3186 3187.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 3188 3189.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 3190 3191.. option:: -fmax-array-constructor=<arg> 3192 3193.. option:: -fmax-errors=<arg> 3194 3195.. option:: -fmax-identifier-length, -fno-max-identifier-length 3196 3197.. option:: -fmax-stack-var-size=<arg> 3198 3199.. option:: -fmax-subrecord-length=<arg> 3200 3201.. option:: -fmodule-private, -fno-module-private 3202 3203.. option:: -fpack-derived, -fno-pack-derived 3204 3205.. option:: -fprotect-parens, -fno-protect-parens 3206 3207.. option:: -frange-check, -fno-range-check 3208 3209.. option:: -freal-4-real-10, -fno-real-4-real-10 3210 3211.. option:: -freal-4-real-16, -fno-real-4-real-16 3212 3213.. option:: -freal-4-real-8, -fno-real-4-real-8 3214 3215.. option:: -freal-8-real-10, -fno-real-8-real-10 3216 3217.. option:: -freal-8-real-16, -fno-real-8-real-16 3218 3219.. option:: -freal-8-real-4, -fno-real-8-real-4 3220 3221.. option:: -frealloc-lhs, -fno-realloc-lhs 3222 3223.. option:: -frecord-marker=<arg> 3224 3225.. option:: -frecursive, -fno-recursive 3226 3227.. option:: -frepack-arrays, -fno-repack-arrays 3228 3229.. option:: -fsecond-underscore, -fno-second-underscore 3230 3231.. option:: -fsign-zero, -fno-sign-zero 3232 3233.. option:: -fstack-arrays, -fno-stack-arrays 3234 3235.. option:: -funderscoring, -fno-underscoring 3236 3237.. option:: -fwhole-file, -fno-whole-file 3238 3239.. option:: -imultilib <arg> 3240 3241.. option:: -nocpp 3242 3243.. option:: -static-libgfortran 3244 3245Linker flags 3246============ 3247Flags that are passed on to the linker 3248 3249.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 3250 3251Add directory to library search path 3252 3253.. option:: -Mach 3254 3255.. option:: -T<script> 3256 3257Specify <script> as linker script 3258 3259.. option:: -Tbss<addr> 3260 3261Set starting address of BSS to <addr> 3262 3263.. option:: -Tdata<addr> 3264 3265Set starting address of DATA to <addr> 3266 3267.. option:: -Ttext<addr> 3268 3269Set starting address of TEXT to <addr> 3270 3271.. option:: -Wl,<arg>,<arg2>... 3272 3273Pass the comma separated arguments in <arg> to the linker 3274 3275.. option:: -X 3276 3277.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 3278 3279Pass <arg> to the linker 3280 3281.. program:: clang1 3282.. option:: -Z 3283.. program:: clang 3284 3285.. option:: -e<arg>, --entry 3286 3287.. option:: -filelist <arg> 3288 3289.. option:: --hip-device-lib-path=<arg> 3290 3291HIP device library path 3292 3293.. option:: --hip-device-lib=<arg> 3294 3295HIP device library 3296 3297.. option:: -l<arg> 3298 3299.. option:: -r 3300 3301.. option:: -rpath <arg> 3302 3303.. option:: -s 3304 3305.. option:: -t 3306 3307.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3308 3309.. option:: -undef 3310 3311undef all system defines 3312 3313.. option:: -undefined<arg>, --no-undefined 3314 3315.. option:: -z <arg> 3316 3317Pass -z <arg> to the linker 3318 3319