1# This CMake module is responsible for interpreting the user defined LLVM_ 2# options and executing the appropriate CMake commands to realize the users' 3# selections. 4 5# This is commonly needed so make sure it's defined before we include anything 6# else. 7string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE) 8 9include(CheckCompilerVersion) 10include(CheckProblematicConfigurations) 11include(HandleLLVMStdlib) 12include(CheckCCompilerFlag) 13include(CheckCXXCompilerFlag) 14include(CheckSymbolExists) 15include(CMakeDependentOption) 16include(LLVMProcessSources) 17 18if(CMAKE_LINKER MATCHES ".*lld" OR (LLVM_USE_LINKER STREQUAL "lld" OR LLVM_ENABLE_LLD)) 19 set(LINKER_IS_LLD TRUE) 20else() 21 set(LINKER_IS_LLD FALSE) 22endif() 23 24if(CMAKE_LINKER MATCHES "lld-link" OR (MSVC AND (LLVM_USE_LINKER STREQUAL "lld" OR LLVM_ENABLE_LLD))) 25 set(LINKER_IS_LLD_LINK TRUE) 26else() 27 set(LINKER_IS_LLD_LINK FALSE) 28endif() 29 30set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO") 31string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO) 32 33# Ninja Job Pool support 34# The following only works with the Ninja generator in CMake >= 3.0. 35set(LLVM_PARALLEL_COMPILE_JOBS "" CACHE STRING 36 "Define the maximum number of concurrent compilation jobs (Ninja only).") 37if(LLVM_PARALLEL_COMPILE_JOBS) 38 if(NOT CMAKE_GENERATOR MATCHES "Ninja") 39 message(WARNING "Job pooling is only available with Ninja generators.") 40 else() 41 set_property(GLOBAL APPEND PROPERTY JOB_POOLS compile_job_pool=${LLVM_PARALLEL_COMPILE_JOBS}) 42 set(CMAKE_JOB_POOL_COMPILE compile_job_pool) 43 endif() 44endif() 45 46set(LLVM_PARALLEL_LINK_JOBS "" CACHE STRING 47 "Define the maximum number of concurrent link jobs (Ninja only).") 48if(CMAKE_GENERATOR MATCHES "Ninja") 49 if(NOT LLVM_PARALLEL_LINK_JOBS AND uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 50 message(STATUS "ThinLTO provides its own parallel linking - limiting parallel link jobs to 2.") 51 set(LLVM_PARALLEL_LINK_JOBS "2") 52 endif() 53 if(LLVM_PARALLEL_LINK_JOBS) 54 set_property(GLOBAL APPEND PROPERTY JOB_POOLS link_job_pool=${LLVM_PARALLEL_LINK_JOBS}) 55 set(CMAKE_JOB_POOL_LINK link_job_pool) 56 endif() 57elseif(LLVM_PARALLEL_LINK_JOBS) 58 message(WARNING "Job pooling is only available with Ninja generators.") 59endif() 60 61if( LLVM_ENABLE_ASSERTIONS ) 62 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 63 if( NOT MSVC ) 64 add_compile_definitions(_DEBUG) 65 endif() 66 # On non-Debug builds cmake automatically defines NDEBUG, so we 67 # explicitly undefine it: 68 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 69 add_compile_options($<$<OR:$<COMPILE_LANGUAGE:C>,$<COMPILE_LANGUAGE:CXX>>:-UNDEBUG>) 70 if (MSVC) 71 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines. 72 foreach (flags_var_to_scrub 73 CMAKE_CXX_FLAGS_RELEASE 74 CMAKE_CXX_FLAGS_RELWITHDEBINFO 75 CMAKE_CXX_FLAGS_MINSIZEREL 76 CMAKE_C_FLAGS_RELEASE 77 CMAKE_C_FLAGS_RELWITHDEBINFO 78 CMAKE_C_FLAGS_MINSIZEREL) 79 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " " 80 "${flags_var_to_scrub}" "${${flags_var_to_scrub}}") 81 endforeach() 82 endif() 83 endif() 84endif() 85 86if(LLVM_ENABLE_EXPENSIVE_CHECKS) 87 add_compile_definitions(EXPENSIVE_CHECKS) 88 89 # In some libstdc++ versions, std::min_element is not constexpr when 90 # _GLIBCXX_DEBUG is enabled. 91 CHECK_CXX_SOURCE_COMPILES(" 92 #define _GLIBCXX_DEBUG 93 #include <algorithm> 94 int main(int argc, char** argv) { 95 static constexpr int data[] = {0, 1}; 96 constexpr const int* min_elt = std::min_element(&data[0], &data[2]); 97 return 0; 98 }" CXX_SUPPORTS_GLIBCXX_DEBUG) 99 if(CXX_SUPPORTS_GLIBCXX_DEBUG) 100 add_compile_definitions(_GLIBCXX_DEBUG) 101 else() 102 add_compile_definitions(_GLIBCXX_ASSERTIONS) 103 endif() 104endif() 105 106if (LLVM_ENABLE_STRICT_FIXED_SIZE_VECTORS) 107 add_compile_definitions(STRICT_FIXED_SIZE_VECTORS) 108endif() 109 110string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS) 111 112if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" ) 113 if( LLVM_ENABLE_ASSERTIONS ) 114 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 115 endif() 116elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" ) 117 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 118elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" ) 119 # We don't need to do anything special to turn off ABI breaking checks. 120elseif( NOT DEFINED LLVM_ABI_BREAKING_CHECKS ) 121 # Treat LLVM_ABI_BREAKING_CHECKS like "FORCE_OFF" when it has not been 122 # defined. 123else() 124 message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!") 125endif() 126 127if( LLVM_REVERSE_ITERATION ) 128 set( LLVM_ENABLE_REVERSE_ITERATION 1 ) 129endif() 130 131if(WIN32) 132 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 133 if(CYGWIN) 134 set(LLVM_ON_WIN32 0) 135 set(LLVM_ON_UNIX 1) 136 else(CYGWIN) 137 set(LLVM_ON_WIN32 1) 138 set(LLVM_ON_UNIX 0) 139 endif(CYGWIN) 140else(WIN32) 141 if(FUCHSIA OR UNIX) 142 set(LLVM_ON_WIN32 0) 143 set(LLVM_ON_UNIX 1) 144 if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "AIX") 145 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 146 else() 147 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1) 148 endif() 149 else(FUCHSIA OR UNIX) 150 MESSAGE(SEND_ERROR "Unable to determine platform") 151 endif(FUCHSIA OR UNIX) 152endif(WIN32) 153 154if (CMAKE_SYSTEM_NAME MATCHES "OS390") 155 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 156endif() 157 158set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX}) 159set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 160 161# We use *.dylib rather than *.so on darwin, but we stick with *.so on AIX. 162if(${CMAKE_SYSTEM_NAME} MATCHES "AIX") 163 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_MODULE_SUFFIX}) 164else() 165 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 166endif() 167 168if(APPLE) 169 # Darwin-specific linker flags for loadable modules. 170 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress") 171endif() 172 173if(${CMAKE_SYSTEM_NAME} MATCHES "Linux") 174 # RHEL7 has ar and ranlib being non-deterministic by default. The D flag forces determinism, 175 # however only GNU version of ar and ranlib (2.27) have this option. 176 # RHEL DTS7 is also affected by this, which uses GNU binutils 2.28 177 execute_process(COMMAND ${CMAKE_AR} rD t.a 178 WORKING_DIRECTORY ${CMAKE_BINARY_DIR} 179 RESULT_VARIABLE AR_RESULT 180 OUTPUT_QUIET 181 ERROR_QUIET 182 ) 183 if(${AR_RESULT} EQUAL 0) 184 execute_process(COMMAND ${CMAKE_RANLIB} -D t.a 185 WORKING_DIRECTORY ${CMAKE_BINARY_DIR} 186 RESULT_VARIABLE RANLIB_RESULT 187 OUTPUT_QUIET 188 ERROR_QUIET 189 ) 190 if(${RANLIB_RESULT} EQUAL 0) 191 set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>" 192 CACHE STRING "archive create command") 193 set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>") 194 set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>" CACHE STRING "ranlib command") 195 196 set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>" 197 CACHE STRING "archive create command") 198 set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>") 199 set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>" CACHE STRING "ranlib command") 200 endif() 201 file(REMOVE ${CMAKE_BINARY_DIR}/t.a) 202 endif() 203endif() 204 205if(${CMAKE_SYSTEM_NAME} MATCHES "AIX") 206 # -fPIC does not enable the large code model for GCC on AIX but does for XL. 207 if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang") 208 append("-mcmodel=large" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 209 elseif(CMAKE_CXX_COMPILER_ID MATCHES "XL") 210 # XL generates a small number of relocations not of the large model, -bbigtoc is needed. 211 append("-Wl,-bbigtoc" 212 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 213 # The default behaviour on AIX processes dynamic initialization of non-local variables with 214 # static storage duration even for archive members that are otherwise unreferenced. 215 # Since `--whole-archive` is not used by the LLVM build to keep such initializations for Linux, 216 # we can limit the processing for archive members to only those that are otherwise referenced. 217 append("-bcdtors:mbr" 218 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 219 endif() 220 if(BUILD_SHARED_LIBS) 221 # See rpath handling in AddLLVM.cmake 222 # FIXME: Remove this warning if this rpath is no longer hardcoded. 223 message(WARNING "Build and install environment path info may be exposed; binaries will also be unrelocatable.") 224 endif() 225endif() 226 227# Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO 228# build might work on ELF but fail on MachO/COFF. 229if(NOT (CMAKE_SYSTEM_NAME MATCHES "Darwin|FreeBSD|OpenBSD|DragonFly|AIX|OS390" OR 230 WIN32 OR CYGWIN) AND 231 NOT LLVM_USE_SANITIZER) 232 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs") 233endif() 234 235# Pass -Wl,-z,nodelete. This makes sure our shared libraries are not unloaded 236# by dlclose(). We need that since the CLI API relies on cross-references 237# between global objects which became horribly broken when one of the libraries 238# is unloaded. 239if(${CMAKE_SYSTEM_NAME} MATCHES "Linux") 240 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,nodelete") 241 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-z,nodelete") 242endif() 243 244 245function(append value) 246 foreach(variable ${ARGN}) 247 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 248 endforeach(variable) 249endfunction() 250 251function(append_if condition value) 252 if (${condition}) 253 foreach(variable ${ARGN}) 254 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 255 endforeach(variable) 256 endif() 257endfunction() 258 259macro(add_flag_if_supported flag name) 260 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 261 append_if("C_SUPPORTS_${name}" "${flag}" CMAKE_C_FLAGS) 262 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 263 append_if("CXX_SUPPORTS_${name}" "${flag}" CMAKE_CXX_FLAGS) 264endmacro() 265 266function(add_flag_or_print_warning flag name) 267 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 268 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 269 if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${name}) 270 message(STATUS "Building with ${flag}") 271 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE) 272 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE) 273 set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${flag}" PARENT_SCOPE) 274 else() 275 message(WARNING "${flag} is not supported.") 276 endif() 277endfunction() 278 279function(has_msvc_incremental_no_flag flags incr_no_flag_on) 280 set(${incr_no_flag_on} OFF PARENT_SCOPE) 281 string(FIND "${flags}" "/INCREMENTAL" idx REVERSE) 282 if (${idx} GREATER -1) 283 string(SUBSTRING "${flags}" ${idx} 15 no_flag) 284 if (${no_flag} MATCHES "/INCREMENTAL:NO") 285 set(${incr_no_flag_on} ON PARENT_SCOPE) 286 endif() 287 endif() 288endfunction() 289 290if( LLVM_ENABLE_LLD ) 291 if ( LLVM_USE_LINKER ) 292 message(FATAL_ERROR "LLVM_ENABLE_LLD and LLVM_USE_LINKER can't be set at the same time") 293 endif() 294 295 # In case of MSVC cmake always invokes the linker directly, so the linker 296 # should be specified by CMAKE_LINKER cmake variable instead of by -fuse-ld 297 # compiler option. 298 if ( MSVC ) 299 if(NOT CMAKE_LINKER MATCHES "lld-link") 300 get_filename_component(CXX_COMPILER_DIR ${CMAKE_CXX_COMPILER} DIRECTORY) 301 get_filename_component(C_COMPILER_DIR ${CMAKE_C_COMPILER} DIRECTORY) 302 find_program(LLD_LINK NAMES "lld-link" "lld-link.exe" HINTS ${CXX_COMPILER_DIR} ${C_COMPILER_DIR} DOC "lld linker") 303 if(NOT LLD_LINK) 304 message(FATAL_ERROR 305 "LLVM_ENABLE_LLD set, but cannot find lld-link. " 306 "Consider setting CMAKE_LINKER to lld-link path.") 307 endif() 308 set(CMAKE_LINKER ${LLD_LINK}) 309 endif() 310 else() 311 set(LLVM_USE_LINKER "lld") 312 endif() 313endif() 314 315if( LLVM_USE_LINKER ) 316 append("-fuse-ld=${LLVM_USE_LINKER}" 317 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 318 check_cxx_source_compiles("int main() { return 0; }" CXX_SUPPORTS_CUSTOM_LINKER) 319 if ( NOT CXX_SUPPORTS_CUSTOM_LINKER ) 320 message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'") 321 endif() 322endif() 323 324if( LLVM_ENABLE_PIC ) 325 if( XCODE ) 326 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't 327 # know how to disable this, so just force ENABLE_PIC off for now. 328 message(WARNING "-fPIC not supported with Xcode.") 329 elseif( WIN32 OR CYGWIN) 330 # On Windows all code is PIC. MinGW warns if -fPIC is used. 331 else() 332 add_flag_or_print_warning("-fPIC" FPIC) 333 # Enable interprocedural optimizations for non-inline functions which would 334 # otherwise be disabled due to GCC -fPIC's default. 335 # Note: GCC<10.3 has a bug on SystemZ. 336 # 337 # Note: Clang allows IPO for -fPIC so this optimization is less effective. 338 # Clang 13 has a bug related to -fsanitize-coverage 339 # -fno-semantic-interposition (https://reviews.llvm.org/D117183). 340 if ((CMAKE_COMPILER_IS_GNUCXX AND 341 NOT (LLVM_NATIVE_ARCH STREQUAL "SystemZ" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.3)) 342 OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 14)) 343 add_flag_if_supported("-fno-semantic-interposition" FNO_SEMANTIC_INTERPOSITION) 344 endif() 345 endif() 346 # GCC for MIPS can miscompile LLVM due to PR37701. 347 if(CMAKE_COMPILER_IS_GNUCXX AND LLVM_NATIVE_ARCH STREQUAL "Mips" AND 348 NOT Uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 349 add_flag_or_print_warning("-fno-shrink-wrap" FNO_SHRINK_WRAP) 350 endif() 351 # gcc with -O3 -fPIC generates TLS sequences that violate the spec on 352 # Solaris/sparcv9, causing executables created with the system linker 353 # to SEGV (GCC PR target/96607). 354 # clang with -O3 -fPIC generates code that SEGVs. 355 # Both can be worked around by compiling with -O instead. 356 if(${CMAKE_SYSTEM_NAME} STREQUAL "SunOS" AND LLVM_NATIVE_ARCH STREQUAL "Sparc") 357 llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELEASE "-O[23]" "-O") 358 llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O[23]" "-O") 359 endif() 360endif() 361 362if((NOT (${CMAKE_SYSTEM_NAME} MATCHES "AIX")) AND 363 (NOT (WIN32 OR CYGWIN) OR (MINGW AND CMAKE_CXX_COMPILER_ID MATCHES "Clang"))) 364 # GCC for MinGW does nothing about -fvisibility-inlines-hidden, but warns 365 # about use of the attributes. As long as we don't use the attributes (to 366 # override the default) we shouldn't set the command line options either. 367 # GCC on AIX warns if -fvisibility-inlines-hidden is used and Clang on AIX doesn't currently support visibility. 368 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 369 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) 370endif() 371 372if(CMAKE_SIZEOF_VOID_P EQUAL 8 AND MINGW) 373 add_compile_definitions(_FILE_OFFSET_BITS=64) 374endif() 375 376if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 377 # TODO: support other platforms and toolchains. 378 if( LLVM_BUILD_32_BITS ) 379 message(STATUS "Building 32 bits executables and libraries.") 380 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32") 381 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32") 382 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32") 383 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32") 384 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32") 385 386 # FIXME: CMAKE_SIZEOF_VOID_P is still 8 387 add_compile_definitions(_LARGEFILE_SOURCE) 388 add_compile_definitions(_FILE_OFFSET_BITS=64) 389 endif( LLVM_BUILD_32_BITS ) 390endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 391 392# If building on a GNU specific 32-bit system, make sure off_t is 64 bits 393# so that off_t can stored offset > 2GB. 394# Android until version N (API 24) doesn't support it. 395if (ANDROID AND (ANDROID_NATIVE_API_LEVEL LESS 24)) 396 set(LLVM_FORCE_SMALLFILE_FOR_ANDROID TRUE) 397endif() 398if( CMAKE_SIZEOF_VOID_P EQUAL 4 AND NOT LLVM_FORCE_SMALLFILE_FOR_ANDROID) 399 # FIXME: It isn't handled in LLVM_BUILD_32_BITS. 400 add_compile_definitions(_LARGEFILE_SOURCE) 401 add_compile_definitions(_FILE_OFFSET_BITS=64) 402endif() 403 404if( XCODE ) 405 # For Xcode enable several build settings that correspond to 406 # many warnings that are on by default in Clang but are 407 # not enabled for historical reasons. For versions of Xcode 408 # that do not support these options they will simply 409 # be ignored. 410 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES") 411 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES") 412 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES") 413 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES") 414 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES") 415 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES") 416 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES") 417 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES") 418 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES") 419 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES") 420 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES") 421 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES") 422 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES") 423 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES") 424 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES") 425endif() 426 427# On Win32 using MS tools, provide an option to set the number of parallel jobs 428# to use. 429if( MSVC_IDE ) 430 set(LLVM_COMPILER_JOBS "0" CACHE STRING 431 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 432 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 433 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 434 add_compile_options(/MP) 435 else() 436 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 437 add_compile_options(/MP${LLVM_COMPILER_JOBS}) 438 endif() 439 else() 440 message(STATUS "Parallel compilation disabled") 441 endif() 442endif() 443 444# set stack reserved size to ~10MB 445if(MSVC) 446 # CMake previously automatically set this value for MSVC builds, but the 447 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default 448 # value (1 MB) which is not enough for us in tasks such as parsing recursive 449 # C++ templates in Clang. 450 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000") 451elseif(MINGW) # FIXME: Also cygwin? 452 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216") 453 454 # Pass -mbig-obj to mingw gas to avoid COFF 2**16 section limit. 455 if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang") 456 append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 457 endif() 458endif() 459 460option(LLVM_ENABLE_WARNINGS "Enable compiler warnings." ON) 461 462if( MSVC ) 463 include(ChooseMSVCCRT) 464 465 # Add definitions that make MSVC much less annoying. 466 add_compile_definitions( 467 # For some reason MS wants to deprecate a bunch of standard functions... 468 _CRT_SECURE_NO_DEPRECATE 469 _CRT_SECURE_NO_WARNINGS 470 _CRT_NONSTDC_NO_DEPRECATE 471 _CRT_NONSTDC_NO_WARNINGS 472 _SCL_SECURE_NO_DEPRECATE 473 _SCL_SECURE_NO_WARNINGS 474 ) 475 476 # Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI. 477 add_compile_definitions( 478 UNICODE 479 _UNICODE 480 ) 481 482 if (LLVM_WINSYSROOT) 483 if (NOT CLANG_CL) 484 message(ERROR "LLVM_WINSYSROOT requires clang-cl") 485 endif() 486 append("/winsysroot${LLVM_WINSYSROOT}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 487 endif() 488 489 if (LLVM_ENABLE_WERROR) 490 append("/WX" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 491 endif (LLVM_ENABLE_WERROR) 492 493 append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 494 495 # Some projects use the __cplusplus preprocessor macro to check support for 496 # a particular version of the C++ standard. When this option is not specified 497 # explicitly, macro's value is "199711L" that implies C++98 Standard. 498 # https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/ 499 append("/Zc:__cplusplus" CMAKE_CXX_FLAGS) 500 501 # Allow users to request PDBs in release mode. CMake offeres the 502 # RelWithDebInfo configuration, but it uses different optimization settings 503 # (/Ob1 vs /Ob2 or -O2 vs -O3). LLVM provides this flag so that users can get 504 # PDBs without changing codegen. 505 option(LLVM_ENABLE_PDB OFF) 506 if (LLVM_ENABLE_PDB AND uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE") 507 append("/Zi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 508 # /DEBUG disables linker GC and ICF, but we want those in Release mode. 509 append("/DEBUG /OPT:REF /OPT:ICF" 510 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS 511 CMAKE_SHARED_LINKER_FLAGS) 512 endif() 513 514 # Get all linker flags in upper case form so we can search them. 515 string(CONCAT all_linker_flags_uppercase 516 ${CMAKE_EXE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " " 517 ${CMAKE_EXE_LINKER_FLAGS} " " 518 ${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " " 519 ${CMAKE_MODULE_LINKER_FLAGS} " " 520 ${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " " 521 ${CMAKE_SHARED_LINKER_FLAGS}) 522 string(TOUPPER "${all_linker_flags_uppercase}" all_linker_flags_uppercase) 523 524 if (CLANG_CL AND LINKER_IS_LLD) 525 # If we are using clang-cl with lld-link and /debug is present in any of the 526 # linker flag variables, pass -gcodeview-ghash to the compiler to speed up 527 # linking. This flag is orthogonal from /Zi, /Z7, and other flags that 528 # enable debug info emission, and only has an effect if those are also in 529 # use. 530 string(FIND "${all_linker_flags_uppercase}" "/DEBUG" linker_flag_idx) 531 if (${linker_flag_idx} GREATER -1) 532 add_flag_if_supported("-gcodeview-ghash" GCODEVIEW_GHASH) 533 endif() 534 endif() 535 536 # "Generate Intrinsic Functions". 537 append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 538 539 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO) 540 # clang-cl and cl by default produce non-deterministic binaries because 541 # link.exe /incremental requires a timestamp in the .obj file. clang-cl 542 # has the flag /Brepro to force deterministic binaries. We want to pass that 543 # whenever you're building with clang unless you're passing /incremental 544 # or using LTO (/Brepro with LTO would result in a warning about the flag 545 # being unused, because we're not generating object files). 546 # This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag() 547 # because cl.exe does not emit an error on flags it doesn't understand, 548 # letting check_cxx_compiler_flag() claim it understands all flags. 549 check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO) 550 if (SUPPORTS_BREPRO) 551 # Check if /INCREMENTAL is passed to the linker and complain that it 552 # won't work with /Brepro. 553 has_msvc_incremental_no_flag("${CMAKE_EXE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_EXE_LINKER_FLAGS}" NO_INCR_EXE) 554 has_msvc_incremental_no_flag("${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_MODULE_LINKER_FLAGS}" NO_INCR_MODULE) 555 has_msvc_incremental_no_flag("${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_SHARED_LINKER_FLAGS}" NO_INCR_SHARED) 556 if (NO_INCR_EXE AND NO_INCR_MODULE AND NO_INCR_SHARED) 557 append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 558 else() 559 message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic") 560 endif() 561 endif() 562 endif() 563 # By default MSVC has a 2^16 limit on the number of sections in an object file, 564 # but in many objects files need more than that. This flag is to increase the 565 # number of sections. 566 append("/bigobj" CMAKE_CXX_FLAGS) 567 568 # Enable standards conformance mode. 569 # This ensures handling of various C/C++ constructs is more similar to other compilers. 570 append("/permissive-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 571endif( MSVC ) 572 573# Warnings-as-errors handling for GCC-compatible compilers: 574if ( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 575 append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 576 append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS) 577endif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 578 579# Specific default warnings-as-errors for compilers accepting GCC-compatible warning flags: 580if ( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" ) 581 add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME) 582 add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW) 583endif( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" ) 584 585# Modules enablement for GCC-compatible compilers: 586if ( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES ) 587 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 588 set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache") 589 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin") 590 # On Darwin -fmodules does not imply -fcxx-modules. 591 set(module_flags "${module_flags} -fcxx-modules") 592 endif() 593 if (LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY) 594 set(module_flags "${module_flags} -Xclang -fmodules-local-submodule-visibility") 595 endif() 596 if (LLVM_ENABLE_MODULE_DEBUGGING AND 597 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR 598 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO"))) 599 set(module_flags "${module_flags} -gmodules") 600 endif() 601 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${module_flags}") 602 603 # Check that we can build code with modules enabled, and that repeatedly 604 # including <cassert> still manages to respect NDEBUG properly. 605 CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG 606 #include <cassert> 607 #define NDEBUG 608 #include <cassert> 609 int main() { assert(this code is not compiled); }" 610 CXX_SUPPORTS_MODULES) 611 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 612 if (CXX_SUPPORTS_MODULES) 613 append("${module_flags}" CMAKE_CXX_FLAGS) 614 else() 615 message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler") 616 endif() 617endif( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES ) 618 619if (MSVC) 620 if (NOT CLANG_CL) 621 set(msvc_warning_flags 622 # Disabled warnings. 623 -wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline) 624 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 625 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 626 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 627 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' 628 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 629 -wd4456 # Suppress 'declaration of 'var' hides local variable' 630 -wd4457 # Suppress 'declaration of 'var' hides function parameter' 631 -wd4458 # Suppress 'declaration of 'var' hides class member' 632 -wd4459 # Suppress 'declaration of 'var' hides global declaration' 633 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 634 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 635 -wd4722 # Suppress 'function' : destructor never returns, potential memory leak 636 -wd4100 # Suppress 'unreferenced formal parameter' 637 -wd4127 # Suppress 'conditional expression is constant' 638 -wd4512 # Suppress 'assignment operator could not be generated' 639 -wd4505 # Suppress 'unreferenced local function has been removed' 640 -wd4610 # Suppress '<class> can never be instantiated' 641 -wd4510 # Suppress 'default constructor could not be generated' 642 -wd4702 # Suppress 'unreachable code' 643 -wd4245 # Suppress ''conversion' : conversion from 'type1' to 'type2', signed/unsigned mismatch' 644 -wd4706 # Suppress 'assignment within conditional expression' 645 -wd4310 # Suppress 'cast truncates constant value' 646 -wd4701 # Suppress 'potentially uninitialized local variable' 647 -wd4703 # Suppress 'potentially uninitialized local pointer variable' 648 -wd4389 # Suppress 'signed/unsigned mismatch' 649 -wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable' 650 -wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation' 651 -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer' 652 -wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed' 653 -wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared' 654 # C4592 is disabled because of false positives in Visual Studio 2015 655 # Update 1. Re-evaluate the usefulness of this diagnostic with Update 2. 656 -wd4592 # Suppress ''var': symbol will be dynamically initialized (implementation limitation) 657 -wd4319 # Suppress ''operator' : zero extending 'type' to 'type' of greater size' 658 # C4709 is disabled because of a bug with Visual Studio 2017 as of 659 # v15.8.8. Re-evaluate the usefulness of this diagnostic when the bug 660 # is fixed. 661 -wd4709 # Suppress comma operator within array index expression 662 663 # Ideally, we'd like this warning to be enabled, but even MSVC 2019 doesn't 664 # support the 'aligned' attribute in the way that clang sources requires (for 665 # any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to 666 # avoid unwanted alignment warnings. 667 -wd4324 # Suppress 'structure was padded due to __declspec(align())' 668 669 # Promoted warnings. 670 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 671 672 # Promoted warnings to errors. 673 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 674 ) 675 endif(NOT CLANG_CL) 676 677 # Enable warnings 678 if (LLVM_ENABLE_WARNINGS) 679 # Put /W4 in front of all the -we flags. cl.exe doesn't care, but for 680 # clang-cl having /W4 after the -we flags will re-enable the warnings 681 # disabled by -we. 682 set(msvc_warning_flags "/W4 ${msvc_warning_flags}") 683 # CMake appends /W3 by default, and having /W3 followed by /W4 will result in 684 # cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is 685 # a command line warning and not a compiler warning, it cannot be suppressed except 686 # by fixing the command line. 687 string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") 688 string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 689 690 if (LLVM_ENABLE_PEDANTIC) 691 # No MSVC equivalent available 692 endif (LLVM_ENABLE_PEDANTIC) 693 endif (LLVM_ENABLE_WARNINGS) 694 695 foreach(flag ${msvc_warning_flags}) 696 append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 697 endforeach(flag) 698endif (MSVC) 699 700if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 701 702 # Don't add -Wall for clang-cl, because it maps -Wall to -Weverything for 703 # MSVC compatibility. /W4 is added above instead. 704 if (NOT CLANG_CL) 705 append("-Wall" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 706 endif() 707 708 append("-Wextra -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 709 append("-Wcast-qual" CMAKE_CXX_FLAGS) 710 711 # Turn off missing field initializer warnings for gcc to avoid noise from 712 # false positives with empty {}. Turn them on otherwise (they're off by 713 # default for clang). 714 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 715 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 716 if (CMAKE_COMPILER_IS_GNUCXX) 717 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 718 else() 719 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 720 endif() 721 endif() 722 723 if (LLVM_ENABLE_PEDANTIC AND LLVM_COMPILER_IS_GCC_COMPATIBLE) 724 append("-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 725 append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 726 727 # GCC warns about redundant toplevel semicolons (enabled by -pedantic 728 # above), while Clang doesn't. Enable the corresponding Clang option to 729 # pick up on these even in builds with Clang. 730 add_flag_if_supported("-Wc++98-compat-extra-semi" CXX98_COMPAT_EXTRA_SEMI_FLAG) 731 endif() 732 733 add_flag_if_supported("-Wimplicit-fallthrough" IMPLICIT_FALLTHROUGH_FLAG) 734 add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG) 735 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS) 736 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS) 737 738 # Disable -Wclass-memaccess, a C++-only warning from GCC 8 that fires on 739 # LLVM's ADT classes. 740 check_cxx_compiler_flag("-Wclass-memaccess" CXX_SUPPORTS_CLASS_MEMACCESS_FLAG) 741 append_if(CXX_SUPPORTS_CLASS_MEMACCESS_FLAG "-Wno-class-memaccess" CMAKE_CXX_FLAGS) 742 743 # Disable -Wredundant-move and -Wpessimizing-move on GCC>=9. GCC wants to 744 # remove std::move in code like "A foo(ConvertibleToA a) { 745 # return std::move(a); }", but this code does not compile (or uses the copy 746 # constructor instead) on clang<=3.8. Clang also has a -Wredundant-move and 747 # -Wpessimizing-move, but they only fire when the types match exactly, so we 748 # can keep them here. 749 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU") 750 check_cxx_compiler_flag("-Wredundant-move" CXX_SUPPORTS_REDUNDANT_MOVE_FLAG) 751 append_if(CXX_SUPPORTS_REDUNDANT_MOVE_FLAG "-Wno-redundant-move" CMAKE_CXX_FLAGS) 752 check_cxx_compiler_flag("-Wpessimizing-move" CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG) 753 append_if(CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG "-Wno-pessimizing-move" CMAKE_CXX_FLAGS) 754 endif() 755 756 # The LLVM libraries have no stable C++ API, so -Wnoexcept-type is not useful. 757 check_cxx_compiler_flag("-Wnoexcept-type" CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG) 758 append_if(CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG "-Wno-noexcept-type" CMAKE_CXX_FLAGS) 759 760 # Check if -Wnon-virtual-dtor warns for a class marked final, when it has a 761 # friend declaration. If it does, don't add -Wnon-virtual-dtor. The case is 762 # considered unhelpful (https://gcc.gnu.org/PR102168). 763 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 764 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=non-virtual-dtor") 765 CHECK_CXX_SOURCE_COMPILES("class f {}; 766 class base {friend f; public: virtual void anchor();protected: ~base();}; 767 int main() { return 0; }" 768 CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR) 769 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 770 append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS) 771 772 append("-Wdelete-non-virtual-dtor" CMAKE_CXX_FLAGS) 773 774 # Enable -Wsuggest-override if it's available, and only if it doesn't 775 # suggest adding 'override' to functions that are already marked 'final' 776 # (which means it is disabled for GCC < 9.2). 777 check_cxx_compiler_flag("-Wsuggest-override" CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG) 778 if (CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG) 779 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 780 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=suggest-override") 781 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();}; 782 class derived : base {public: void anchor() final;}; 783 int main() { return 0; }" 784 CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL) 785 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 786 append_if(CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL "-Wsuggest-override" CMAKE_CXX_FLAGS) 787 endif() 788 789 # Check if -Wcomment is OK with an // comment ending with '\' if the next 790 # line is also a // comment. 791 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 792 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment") 793 CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main(void) {return 0;}" 794 C_WCOMMENT_ALLOWS_LINE_WRAP) 795 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 796 if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP) 797 append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 798 endif() 799 800 # Enable -Wstring-conversion to catch misuse of string literals. 801 add_flag_if_supported("-Wstring-conversion" STRING_CONVERSION_FLAG) 802 803 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU") 804 # Disable the misleading indentation warning with GCC; GCC can 805 # produce noisy notes about this getting disabled in large files. 806 # See e.g. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89549 807 check_cxx_compiler_flag("-Wmisleading-indentation" CXX_SUPPORTS_MISLEADING_INDENTATION_FLAG) 808 append_if(CXX_SUPPORTS_MISLEADING_INDENTATION_FLAG "-Wno-misleading-indentation" CMAKE_CXX_FLAGS) 809 else() 810 # Prevent bugs that can happen with llvm's brace style. 811 add_flag_if_supported("-Wmisleading-indentation" MISLEADING_INDENTATION_FLAG) 812 endif() 813 814 # Enable -Wctad-maybe-unsupported to catch unintended use of CTAD. 815 add_flag_if_supported("-Wctad-maybe-unsupported" CTAD_MAYBE_UNSPPORTED_FLAG) 816endif (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 817 818if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT LLVM_ENABLE_WARNINGS) 819 append("-w" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 820endif() 821 822macro(append_common_sanitizer_flags) 823 if (NOT MSVC) 824 # Append -fno-omit-frame-pointer and turn on debug info to get better 825 # stack traces. 826 add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER) 827 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 828 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 829 add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY) 830 endif() 831 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large. 832 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND LLVM_OPTIMIZE_SANITIZED_BUILDS) 833 add_flag_if_supported("-O1" O1) 834 endif() 835 else() 836 # Always ask the linker to produce symbols with asan. 837 append("/Z7" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 838 append("/debug" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 839 # Not compatible with /INCREMENTAL link. 840 foreach (flags_opt_to_scrub 841 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 842 string (REGEX REPLACE "(^| )/INCREMENTAL($| )" " /INCREMENTAL:NO " 843 "${flags_opt_to_scrub}" "${${flags_opt_to_scrub}}") 844 endforeach() 845 if (LLVM_HOST_TRIPLE MATCHES "i[2-6]86-.*") 846 # Keep frame pointers around. 847 append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 848 endif() 849 endif() 850endmacro() 851 852# Turn on sanitizers if necessary. 853if(LLVM_USE_SANITIZER) 854 if (LLVM_ON_UNIX) 855 if (LLVM_USE_SANITIZER STREQUAL "Address") 856 append_common_sanitizer_flags() 857 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 858 elseif (LLVM_USE_SANITIZER STREQUAL "HWAddress") 859 append_common_sanitizer_flags() 860 append("-fsanitize=hwaddress" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 861 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 862 append_common_sanitizer_flags() 863 append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 864 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 865 append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 866 endif() 867 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 868 append_common_sanitizer_flags() 869 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 870 elseif (LLVM_USE_SANITIZER STREQUAL "Thread") 871 append_common_sanitizer_flags() 872 append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 873 elseif (LLVM_USE_SANITIZER STREQUAL "DataFlow") 874 append("-fsanitize=dataflow" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 875 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 876 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 877 append_common_sanitizer_flags() 878 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 879 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 880 elseif (LLVM_USE_SANITIZER STREQUAL "Leaks") 881 append_common_sanitizer_flags() 882 append("-fsanitize=leak" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 883 else() 884 message(FATAL_ERROR "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 885 endif() 886 elseif(MINGW) 887 if (LLVM_USE_SANITIZER STREQUAL "Address") 888 append_common_sanitizer_flags() 889 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 890 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 891 append_common_sanitizer_flags() 892 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 893 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 894 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 895 append_common_sanitizer_flags() 896 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 897 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 898 else() 899 message(FATAL_ERROR "This sanitizer not yet supported in a MinGW environment: ${LLVM_USE_SANITIZER}") 900 endif() 901 elseif(MSVC) 902 if (LLVM_USE_SANITIZER STREQUAL "Address") 903 append_common_sanitizer_flags() 904 append("/fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 905 if (NOT CLANG_CL) 906 # Not compatible with /RTC flags. 907 foreach (flags_opt_to_scrub 908 CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_TYPE} CMAKE_C_FLAGS_${uppercase_CMAKE_BUILD_TYPE}) 909 string (REGEX REPLACE "(^| )/RTC[1csu]*($| )" " " 910 "${flags_opt_to_scrub}" "${${flags_opt_to_scrub}}") 911 endforeach() 912 endif() 913 if (LINKER_IS_LLD_LINK) 914 if (LLVM_HOST_TRIPLE MATCHES "i[2-6]86-.*") 915 set(arch "i386") 916 else() 917 set(arch "x86_64") 918 endif() 919 if (${LLVM_USE_CRT_${uppercase_CMAKE_BUILD_TYPE}} MATCHES "^(MT|MTd)$") 920 append("/wholearchive:clang_rt.asan-${arch}.lib /wholearchive:clang_rt.asan_cxx-${arch}.lib" 921 CMAKE_EXE_LINKER_FLAGS) 922 append("/wholearchive:clang_rt.asan_dll_thunk-${arch}.lib" 923 CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 924 else() 925 append("clang_rt.asan_dynamic-${arch}.lib /wholearchive:clang_rt.asan_dynamic_runtime_thunk-${arch}.lib" 926 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 927 endif() 928 endif() 929 else() 930 message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}") 931 endif() 932 else() 933 message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.") 934 endif() 935 if (LLVM_USE_SANITIZE_COVERAGE) 936 append("-fsanitize=fuzzer-no-link" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 937 endif() 938 if (LLVM_USE_SANITIZER MATCHES ".*Undefined.*") 939 set(IGNORELIST_FILE "${PROJECT_SOURCE_DIR}/utils/sanitizers/ubsan_ignorelist.txt") 940 if (EXISTS "${IGNORELIST_FILE}") 941 # Use this option name version since -fsanitize-ignorelist is only 942 # accepted with clang 13.0 or newer. 943 append("-fsanitize-blacklist=${IGNORELIST_FILE}" 944 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 945 endif() 946 endif() 947endif() 948 949# Turn on -gsplit-dwarf if requested in debug builds. 950if (LLVM_USE_SPLIT_DWARF AND 951 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR 952 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO"))) 953 # Limit to clang and gcc so far. Add compilers supporting this option. 954 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR 955 CMAKE_CXX_COMPILER_ID STREQUAL "GNU") 956 add_compile_options(-gsplit-dwarf) 957 include(LLVMCheckLinkerFlag) 958 llvm_check_linker_flag(CXX "-Wl,--gdb-index" LINKER_SUPPORTS_GDB_INDEX) 959 append_if(LINKER_SUPPORTS_GDB_INDEX "-Wl,--gdb-index" 960 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 961 endif() 962endif() 963 964add_compile_definitions(__STDC_CONSTANT_MACROS) 965add_compile_definitions(__STDC_FORMAT_MACROS) 966add_compile_definitions(__STDC_LIMIT_MACROS) 967 968# clang and gcc don't default-print colored diagnostics when invoked from Ninja. 969if (UNIX AND 970 CMAKE_GENERATOR MATCHES "Ninja" AND 971 (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR 972 (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND 973 NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)))) 974 append("-fdiagnostics-color" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 975endif() 976 977# lld doesn't print colored diagnostics when invoked from Ninja 978if (UNIX AND CMAKE_GENERATOR MATCHES "Ninja") 979 include(LLVMCheckLinkerFlag) 980 llvm_check_linker_flag(CXX "-Wl,--color-diagnostics" LINKER_SUPPORTS_COLOR_DIAGNOSTICS) 981 append_if(LINKER_SUPPORTS_COLOR_DIAGNOSTICS "-Wl,--color-diagnostics" 982 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 983endif() 984 985# Add flags for add_dead_strip(). 986# FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF? 987# But MinSizeRel seems to add that automatically, so maybe disable these 988# flags instead if LLVM_NO_DEAD_STRIP is set. 989if(NOT CYGWIN AND NOT MSVC) 990 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND 991 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 992 check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS) 993 if (C_SUPPORTS_FNO_FUNCTION_SECTIONS) 994 # Don't add -ffunction-sections if it can't be disabled with -fno-function-sections. 995 # Doing so will break sanitizers. 996 add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS) 997 elseif (CMAKE_CXX_COMPILER_ID MATCHES "XL") 998 append("-qfuncsect" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 999 endif() 1000 add_flag_if_supported("-fdata-sections" FDATA_SECTIONS) 1001 endif() 1002elseif(MSVC) 1003 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 1004 append("/Gw" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1005 endif() 1006endif() 1007 1008if(MSVC) 1009 # Remove flags here, for exceptions and RTTI. 1010 # Each target property or source property should be responsible to control 1011 # them. 1012 # CL.EXE complains to override flags like "/GR /GR-". 1013 string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 1014 string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 1015endif() 1016 1017# Provide public options to globally control RTTI and EH 1018option(LLVM_ENABLE_EH "Enable Exception handling" OFF) 1019option(LLVM_ENABLE_RTTI "Enable run time type information" OFF) 1020if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI) 1021 message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON") 1022endif() 1023 1024option(LLVM_ENABLE_IR_PGO "Build LLVM and tools with IR PGO instrumentation (deprecated)" Off) 1025mark_as_advanced(LLVM_ENABLE_IR_PGO) 1026 1027set(LLVM_BUILD_INSTRUMENTED OFF CACHE STRING "Build LLVM and tools with PGO instrumentation. May be specified as IR or Frontend") 1028set(LLVM_VP_COUNTERS_PER_SITE "1.5" CACHE STRING "Value profile counters to use per site for IR PGO with Clang") 1029mark_as_advanced(LLVM_BUILD_INSTRUMENTED LLVM_VP_COUNTERS_PER_SITE) 1030string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED) 1031 1032if (LLVM_BUILD_INSTRUMENTED) 1033 if (LLVM_ENABLE_IR_PGO OR uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "IR") 1034 append("-fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\"" 1035 CMAKE_CXX_FLAGS 1036 CMAKE_C_FLAGS) 1037 if(NOT LINKER_IS_LLD_LINK) 1038 append("-fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\"" 1039 CMAKE_EXE_LINKER_FLAGS 1040 CMAKE_SHARED_LINKER_FLAGS) 1041 endif() 1042 # Set this to avoid running out of the value profile node section 1043 # under clang in dynamic linking mode. 1044 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND 1045 CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 11 AND 1046 LLVM_LINK_LLVM_DYLIB) 1047 append("-Xclang -mllvm -Xclang -vp-counters-per-site=${LLVM_VP_COUNTERS_PER_SITE}" 1048 CMAKE_CXX_FLAGS 1049 CMAKE_C_FLAGS) 1050 endif() 1051 elseif(uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "CSIR") 1052 append("-fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\"" 1053 CMAKE_CXX_FLAGS 1054 CMAKE_C_FLAGS) 1055 if(NOT LINKER_IS_LLD_LINK) 1056 append("-fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\"" 1057 CMAKE_EXE_LINKER_FLAGS 1058 CMAKE_SHARED_LINKER_FLAGS) 1059 endif() 1060 else() 1061 append("-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\"" 1062 CMAKE_CXX_FLAGS 1063 CMAKE_C_FLAGS) 1064 if(NOT LINKER_IS_LLD_LINK) 1065 append("-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\"" 1066 CMAKE_EXE_LINKER_FLAGS 1067 CMAKE_SHARED_LINKER_FLAGS) 1068 endif() 1069 endif() 1070endif() 1071 1072# When using clang-cl with an instrumentation-based tool, add clang's library 1073# resource directory to the library search path. Because cmake invokes the 1074# linker directly, it isn't sufficient to pass -fsanitize=* to the linker. 1075if (CLANG_CL AND (LLVM_BUILD_INSTRUMENTED OR LLVM_USE_SANITIZER)) 1076 execute_process( 1077 COMMAND ${CMAKE_CXX_COMPILER} /clang:-print-libgcc-file-name /clang:--rtlib=compiler-rt 1078 OUTPUT_VARIABLE clang_compiler_rt_file 1079 ERROR_VARIABLE clang_cl_stderr 1080 OUTPUT_STRIP_TRAILING_WHITESPACE 1081 ERROR_STRIP_TRAILING_WHITESPACE 1082 RESULT_VARIABLE clang_cl_exit_code) 1083 if (NOT "${clang_cl_exit_code}" STREQUAL "0") 1084 message(FATAL_ERROR 1085 "Unable to invoke clang-cl to find resource dir: ${clang_cl_stderr}") 1086 endif() 1087 file(TO_CMAKE_PATH "${clang_compiler_rt_file}" clang_compiler_rt_file) 1088 get_filename_component(clang_runtime_dir "${clang_compiler_rt_file}" DIRECTORY) 1089 append("/libpath:${clang_runtime_dir}" 1090 CMAKE_EXE_LINKER_FLAGS 1091 CMAKE_MODULE_LINKER_FLAGS 1092 CMAKE_SHARED_LINKER_FLAGS) 1093endif() 1094 1095if(LLVM_PROFDATA_FILE AND EXISTS ${LLVM_PROFDATA_FILE}) 1096 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" ) 1097 append("-fprofile-instr-use=\"${LLVM_PROFDATA_FILE}\"" 1098 CMAKE_CXX_FLAGS 1099 CMAKE_C_FLAGS) 1100 if(NOT LINKER_IS_LLD_LINK) 1101 append("-fprofile-instr-use=\"${LLVM_PROFDATA_FILE}\"" 1102 CMAKE_EXE_LINKER_FLAGS 1103 CMAKE_SHARED_LINKER_FLAGS) 1104 endif() 1105 else() 1106 message(FATAL_ERROR "LLVM_PROFDATA_FILE can only be specified when compiling with clang") 1107 endif() 1108endif() 1109 1110option(LLVM_BUILD_INSTRUMENTED_COVERAGE "Build LLVM and tools with Code Coverage instrumentation" Off) 1111mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE) 1112append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\" -fcoverage-mapping" 1113 CMAKE_CXX_FLAGS 1114 CMAKE_C_FLAGS 1115 CMAKE_EXE_LINKER_FLAGS 1116 CMAKE_SHARED_LINKER_FLAGS) 1117 1118if (LLVM_BUILD_INSTRUMENTED AND LLVM_BUILD_INSTRUMENTED_COVERAGE) 1119 message(FATAL_ERROR "LLVM_BUILD_INSTRUMENTED and LLVM_BUILD_INSTRUMENTED_COVERAGE cannot both be specified") 1120endif() 1121 1122set(LLVM_THINLTO_CACHE_PATH "${PROJECT_BINARY_DIR}/lto.cache" CACHE STRING "Set ThinLTO cache path. This can be used when building LLVM from several different directiories.") 1123 1124if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK AND NOT MINGW) 1125 message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)") 1126endif() 1127if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 1128 append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 1129 if(NOT LINKER_IS_LLD_LINK) 1130 append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1131 endif() 1132 # If the linker supports it, enable the lto cache. This improves initial build 1133 # time a little since we re-link a lot of the same objects, and significantly 1134 # improves incremental build time. 1135 # FIXME: We should move all this logic into the clang driver. 1136 if(APPLE) 1137 append("-Wl,-cache_path_lto,${LLVM_THINLTO_CACHE_PATH}" 1138 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1139 elseif((UNIX OR MINGW) AND LLVM_USE_LINKER STREQUAL "lld") 1140 append("-Wl,--thinlto-cache-dir=${LLVM_THINLTO_CACHE_PATH}" 1141 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1142 elseif(LLVM_USE_LINKER STREQUAL "gold") 1143 append("-Wl,--plugin-opt,cache-dir=${LLVM_THINLTO_CACHE_PATH}" 1144 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1145 elseif(LINKER_IS_LLD_LINK) 1146 append("/lldltocache:${LLVM_THINLTO_CACHE_PATH}" 1147 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1148 endif() 1149elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL") 1150 append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 1151 if(NOT LINKER_IS_LLD_LINK) 1152 append("-flto=full" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1153 endif() 1154elseif(LLVM_ENABLE_LTO) 1155 append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 1156 if(NOT LINKER_IS_LLD_LINK) 1157 append("-flto" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1158 endif() 1159endif() 1160 1161# Set an AIX default for LLVM_EXPORT_SYMBOLS_FOR_PLUGINS based on whether we are 1162# doing dynamic linking (see below). 1163set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default OFF) 1164if (NOT (BUILD_SHARED_LIBS OR LLVM_LINK_LLVM_DYLIB)) 1165 set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default ON) 1166endif() 1167 1168# This option makes utils/extract_symbols.py be used to determine the list of 1169# symbols to export from LLVM tools. This is necessary when on AIX or when using 1170# MSVC if you want to allow plugins. On AIX we don't show this option, and we 1171# enable it by default except when the LLVM libraries are set up for dynamic 1172# linking (due to incompatibility). With MSVC, note that the plugin has to 1173# explicitly link against (exactly one) tool so we can't unilaterally turn on 1174# LLVM_ENABLE_PLUGINS when it's enabled. 1175CMAKE_DEPENDENT_OPTION(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS 1176 "Export symbols from LLVM tools so that plugins can import them" OFF 1177 "NOT ${CMAKE_SYSTEM_NAME} MATCHES AIX" ${LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default}) 1178if(BUILD_SHARED_LIBS AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 1179 message(FATAL_ERROR "BUILD_SHARED_LIBS not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 1180endif() 1181if(LLVM_LINK_LLVM_DYLIB AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 1182 message(FATAL_ERROR "LLVM_LINK_LLVM_DYLIB not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 1183endif() 1184 1185# By default we should enable LLVM_ENABLE_IDE only for multi-configuration 1186# generators. This option disables optional build system features that make IDEs 1187# less usable. 1188set(LLVM_ENABLE_IDE_default OFF) 1189if (CMAKE_CONFIGURATION_TYPES) 1190 set(LLVM_ENABLE_IDE_default ON) 1191endif() 1192option(LLVM_ENABLE_IDE 1193 "Disable optional build system features that cause problems for IDE generators" 1194 ${LLVM_ENABLE_IDE_default}) 1195if (CMAKE_CONFIGURATION_TYPES AND NOT LLVM_ENABLE_IDE) 1196 message(WARNING "Disabling LLVM_ENABLE_IDE on multi-configuration generators is not recommended.") 1197endif() 1198 1199function(get_compile_definitions) 1200 get_directory_property(top_dir_definitions DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS) 1201 foreach(definition ${top_dir_definitions}) 1202 if(DEFINED result) 1203 string(APPEND result " -D${definition}") 1204 else() 1205 set(result "-D${definition}") 1206 endif() 1207 endforeach() 1208 set(LLVM_DEFINITIONS "${result}" PARENT_SCOPE) 1209endfunction() 1210get_compile_definitions() 1211 1212option(LLVM_FORCE_ENABLE_STATS "Enable statistics collection for builds that wouldn't normally enable it" OFF) 1213 1214check_symbol_exists(os_signpost_interval_begin "os/signpost.h" macos_signposts_available) 1215if(macos_signposts_available) 1216 check_cxx_source_compiles( 1217 "#include <os/signpost.h> 1218 int main() { os_signpost_interval_begin(nullptr, 0, \"\", \"\"); return 0; }" 1219 macos_signposts_usable) 1220 if(macos_signposts_usable) 1221 set(LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS "WITH_ASSERTS" CACHE STRING 1222 "Enable support for Xcode signposts. Can be WITH_ASSERTS, FORCE_ON, FORCE_OFF") 1223 string(TOUPPER "${LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS}" 1224 uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS) 1225 if( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "WITH_ASSERTS" ) 1226 if( LLVM_ENABLE_ASSERTIONS ) 1227 set( LLVM_SUPPORT_XCODE_SIGNPOSTS 1 ) 1228 endif() 1229 elseif( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "FORCE_ON" ) 1230 set( LLVM_SUPPORT_XCODE_SIGNPOSTS 1 ) 1231 elseif( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "FORCE_OFF" ) 1232 # We don't need to do anything special to turn off signposts. 1233 elseif( NOT DEFINED LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS ) 1234 # Treat LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS like "FORCE_OFF" when it has not been 1235 # defined. 1236 else() 1237 message(FATAL_ERROR "Unknown value for LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS:" 1238 " \"${LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS}\"!") 1239 endif() 1240 endif() 1241endif() 1242 1243set(LLVM_SOURCE_PREFIX "" CACHE STRING "Use prefix for sources") 1244 1245option(LLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO "Use relative paths in debug info" OFF) 1246 1247if(LLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO) 1248 check_c_compiler_flag("-fdebug-prefix-map=foo=bar" SUPPORTS_FDEBUG_PREFIX_MAP) 1249 if(LLVM_ENABLE_PROJECTS_USED) 1250 get_filename_component(source_root "${LLVM_MAIN_SRC_DIR}/.." ABSOLUTE) 1251 else() 1252 set(source_root "${LLVM_MAIN_SRC_DIR}") 1253 endif() 1254 file(RELATIVE_PATH relative_root "${source_root}" "${CMAKE_BINARY_DIR}") 1255 append_if(SUPPORTS_FDEBUG_PREFIX_MAP "-fdebug-prefix-map=${CMAKE_BINARY_DIR}=${relative_root}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1256 append_if(SUPPORTS_FDEBUG_PREFIX_MAP "-fdebug-prefix-map=${source_root}/=${LLVM_SOURCE_PREFIX}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1257 add_flag_if_supported("-no-canonical-prefixes" NO_CANONICAL_PREFIXES) 1258endif() 1259 1260option(LLVM_USE_RELATIVE_PATHS_IN_FILES "Use relative paths in sources and debug info" OFF) 1261 1262if(LLVM_USE_RELATIVE_PATHS_IN_FILES) 1263 check_c_compiler_flag("-ffile-prefix-map=foo=bar" SUPPORTS_FFILE_PREFIX_MAP) 1264 if(LLVM_ENABLE_PROJECTS_USED) 1265 get_filename_component(source_root "${LLVM_MAIN_SRC_DIR}/.." ABSOLUTE) 1266 else() 1267 set(source_root "${LLVM_MAIN_SRC_DIR}") 1268 endif() 1269 file(RELATIVE_PATH relative_root "${source_root}" "${CMAKE_BINARY_DIR}") 1270 append_if(SUPPORTS_FFILE_PREFIX_MAP "-ffile-prefix-map=${CMAKE_BINARY_DIR}=${relative_root}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1271 append_if(SUPPORTS_FFILE_PREFIX_MAP "-ffile-prefix-map=${source_root}/=${LLVM_SOURCE_PREFIX}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1272 add_flag_if_supported("-no-canonical-prefixes" NO_CANONICAL_PREFIXES) 1273endif() 1274 1275set(LLVM_THIRD_PARTY_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../third-party CACHE STRING 1276 "Directory containing third party software used by LLVM (e.g. googletest)") 1277