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 "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE) 8 9include(CheckCompilerVersion) 10include(HandleLLVMStdlib) 11include(CheckCCompilerFlag) 12include(CheckCXXCompilerFlag) 13include(CheckSymbolExists) 14include(CMakeDependentOption) 15include(LLVMProcessSources) 16 17if(CMAKE_LINKER MATCHES ".*lld" OR (LLVM_USE_LINKER STREQUAL "lld" OR LLVM_ENABLE_LLD)) 18 set(LINKER_IS_LLD TRUE) 19else() 20 set(LINKER_IS_LLD FALSE) 21endif() 22 23if(CMAKE_LINKER MATCHES "lld-link" OR (MSVC AND (LLVM_USE_LINKER STREQUAL "lld" OR LLVM_ENABLE_LLD))) 24 set(LINKER_IS_LLD_LINK TRUE) 25else() 26 set(LINKER_IS_LLD_LINK FALSE) 27endif() 28 29set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO") 30string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO) 31 32# Ninja Job Pool support 33# The following only works with the Ninja generator in CMake >= 3.0. 34set(LLVM_PARALLEL_COMPILE_JOBS "" CACHE STRING 35 "Define the maximum number of concurrent compilation jobs (Ninja only).") 36if(LLVM_PARALLEL_COMPILE_JOBS) 37 if(NOT CMAKE_GENERATOR STREQUAL "Ninja") 38 message(WARNING "Job pooling is only available with Ninja generators.") 39 else() 40 set_property(GLOBAL APPEND PROPERTY JOB_POOLS compile_job_pool=${LLVM_PARALLEL_COMPILE_JOBS}) 41 set(CMAKE_JOB_POOL_COMPILE compile_job_pool) 42 endif() 43endif() 44 45set(LLVM_PARALLEL_LINK_JOBS "" CACHE STRING 46 "Define the maximum number of concurrent link jobs (Ninja only).") 47if(CMAKE_GENERATOR STREQUAL "Ninja") 48 if(NOT LLVM_PARALLEL_LINK_JOBS AND uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 49 message(STATUS "ThinLTO provides its own parallel linking - limiting parallel link jobs to 2.") 50 set(LLVM_PARALLEL_LINK_JOBS "2") 51 endif() 52 if(LLVM_PARALLEL_LINK_JOBS) 53 set_property(GLOBAL APPEND PROPERTY JOB_POOLS link_job_pool=${LLVM_PARALLEL_LINK_JOBS}) 54 set(CMAKE_JOB_POOL_LINK link_job_pool) 55 endif() 56elseif(LLVM_PARALLEL_LINK_JOBS) 57 message(WARNING "Job pooling is only available with Ninja generators.") 58endif() 59 60if( LLVM_ENABLE_ASSERTIONS ) 61 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 62 if( NOT MSVC ) 63 add_definitions( -D_DEBUG ) 64 endif() 65 # On non-Debug builds cmake automatically defines NDEBUG, so we 66 # explicitly undefine it: 67 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 68 # NOTE: use `add_compile_options` rather than `add_definitions` since 69 # `add_definitions` does not support generator expressions. 70 add_compile_options($<$<OR:$<COMPILE_LANGUAGE:C>,$<COMPILE_LANGUAGE:CXX>>:-UNDEBUG>) 71 if (MSVC) 72 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines. 73 foreach (flags_var_to_scrub 74 CMAKE_CXX_FLAGS_RELEASE 75 CMAKE_CXX_FLAGS_RELWITHDEBINFO 76 CMAKE_CXX_FLAGS_MINSIZEREL 77 CMAKE_C_FLAGS_RELEASE 78 CMAKE_C_FLAGS_RELWITHDEBINFO 79 CMAKE_C_FLAGS_MINSIZEREL) 80 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " " 81 "${flags_var_to_scrub}" "${${flags_var_to_scrub}}") 82 endforeach() 83 endif() 84 endif() 85endif() 86 87if(LLVM_ENABLE_EXPENSIVE_CHECKS) 88 add_definitions(-DEXPENSIVE_CHECKS) 89 90 # In some libstdc++ versions, std::min_element is not constexpr when 91 # _GLIBCXX_DEBUG is enabled. 92 CHECK_CXX_SOURCE_COMPILES(" 93 #define _GLIBCXX_DEBUG 94 #include <algorithm> 95 int main(int argc, char** argv) { 96 static constexpr int data[] = {0, 1}; 97 constexpr const int* min_elt = std::min_element(&data[0], &data[2]); 98 return 0; 99 }" CXX_SUPPORTS_GLIBCXX_DEBUG) 100 if(CXX_SUPPORTS_GLIBCXX_DEBUG) 101 add_definitions(-D_GLIBCXX_DEBUG) 102 else() 103 add_definitions(-D_GLIBCXX_ASSERTIONS) 104 endif() 105endif() 106 107if (LLVM_ENABLE_STRICT_FIXED_SIZE_VECTORS) 108 add_definitions(-DSTRICT_FIXED_SIZE_VECTORS) 109endif() 110 111string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS) 112 113if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" ) 114 if( LLVM_ENABLE_ASSERTIONS ) 115 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 116 endif() 117elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" ) 118 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 119elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" ) 120 # We don't need to do anything special to turn off ABI breaking checks. 121elseif( NOT DEFINED LLVM_ABI_BREAKING_CHECKS ) 122 # Treat LLVM_ABI_BREAKING_CHECKS like "FORCE_OFF" when it has not been 123 # defined. 124else() 125 message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!") 126endif() 127 128if( LLVM_REVERSE_ITERATION ) 129 set( LLVM_ENABLE_REVERSE_ITERATION 1 ) 130endif() 131 132if(WIN32) 133 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 134 if(CYGWIN) 135 set(LLVM_ON_WIN32 0) 136 set(LLVM_ON_UNIX 1) 137 else(CYGWIN) 138 set(LLVM_ON_WIN32 1) 139 set(LLVM_ON_UNIX 0) 140 endif(CYGWIN) 141else(WIN32) 142 if(FUCHSIA OR UNIX) 143 set(LLVM_ON_WIN32 0) 144 set(LLVM_ON_UNIX 1) 145 if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "AIX") 146 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 147 else() 148 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1) 149 endif() 150 else(FUCHSIA OR UNIX) 151 MESSAGE(SEND_ERROR "Unable to determine platform") 152 endif(FUCHSIA OR UNIX) 153endif(WIN32) 154 155if (CMAKE_SYSTEM_NAME MATCHES "OS390") 156 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 157endif() 158 159set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX}) 160set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 161 162# We use *.dylib rather than *.so on darwin, but we stick with *.so on AIX. 163if(${CMAKE_SYSTEM_NAME} MATCHES "AIX") 164 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_MODULE_SUFFIX}) 165else() 166 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 167endif() 168 169if(APPLE) 170 if(LLVM_ENABLE_LLD AND LLVM_ENABLE_LTO) 171 message(FATAL_ERROR "lld does not support LTO on Darwin") 172 endif() 173 # Darwin-specific linker flags for loadable modules. 174 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress") 175endif() 176 177if(${CMAKE_SYSTEM_NAME} MATCHES "Linux") 178 # RHEL7 has ar and ranlib being non-deterministic by default. The D flag forces determinism, 179 # however only GNU version of ar and ranlib (2.27) have this option. 180 # RHEL DTS7 is also affected by this, which uses GNU binutils 2.28 181 execute_process(COMMAND ${CMAKE_AR} rD t.a 182 WORKING_DIRECTORY ${CMAKE_BINARY_DIR} 183 RESULT_VARIABLE AR_RESULT 184 OUTPUT_QUIET 185 ERROR_QUIET 186 ) 187 if(${AR_RESULT} EQUAL 0) 188 execute_process(COMMAND ${CMAKE_RANLIB} -D t.a 189 WORKING_DIRECTORY ${CMAKE_BINARY_DIR} 190 RESULT_VARIABLE RANLIB_RESULT 191 OUTPUT_QUIET 192 ERROR_QUIET 193 ) 194 if(${RANLIB_RESULT} EQUAL 0) 195 set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>") 196 set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>") 197 set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>") 198 199 set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>") 200 set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>") 201 set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>") 202 endif() 203 file(REMOVE ${CMAKE_BINARY_DIR}/t.a) 204 endif() 205endif() 206 207if(${CMAKE_SYSTEM_NAME} MATCHES "AIX") 208 # -fPIC does not enable the large code model for GCC on AIX but does for XL. 209 if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang") 210 append("-mcmodel=large" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 211 elseif(CMAKE_CXX_COMPILER_ID MATCHES "XL") 212 # XL generates a small number of relocations not of the large model, -bbigtoc is needed. 213 append("-Wl,-bbigtoc" 214 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 215 # The default behaviour on AIX processes dynamic initialization of non-local variables with 216 # static storage duration even for archive members that are otherwise unreferenced. 217 # Since `--whole-archive` is not used by the LLVM build to keep such initializations for Linux, 218 # we can limit the processing for archive members to only those that are otherwise referenced. 219 append("-bcdtors:mbr" 220 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 221 endif() 222 if(BUILD_SHARED_LIBS) 223 # See rpath handling in AddLLVM.cmake 224 # FIXME: Remove this warning if this rpath is no longer hardcoded. 225 message(WARNING "Build and install environment path info may be exposed; binaries will also be unrelocatable.") 226 endif() 227endif() 228 229# Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO 230# build might work on ELF but fail on MachO/COFF. 231if(NOT (CMAKE_SYSTEM_NAME MATCHES "Darwin|FreeBSD|OpenBSD|DragonFly|AIX|SunOS|OS390" OR 232 WIN32 OR CYGWIN) AND 233 NOT LLVM_USE_SANITIZER) 234 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs") 235endif() 236 237# Pass -Wl,-z,nodelete. This makes sure our shared libraries are not unloaded 238# by dlclose(). We need that since the CLI API relies on cross-references 239# between global objects which became horribly broken when one of the libraries 240# is unloaded. 241if(${CMAKE_SYSTEM_NAME} MATCHES "Linux") 242 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,nodelete") 243 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-z,nodelete") 244endif() 245 246 247function(append value) 248 foreach(variable ${ARGN}) 249 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 250 endforeach(variable) 251endfunction() 252 253function(append_if condition value) 254 if (${condition}) 255 foreach(variable ${ARGN}) 256 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 257 endforeach(variable) 258 endif() 259endfunction() 260 261macro(add_flag_if_supported flag name) 262 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 263 append_if("C_SUPPORTS_${name}" "${flag}" CMAKE_C_FLAGS) 264 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 265 append_if("CXX_SUPPORTS_${name}" "${flag}" CMAKE_CXX_FLAGS) 266endmacro() 267 268function(add_flag_or_print_warning flag name) 269 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 270 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 271 if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${name}) 272 message(STATUS "Building with ${flag}") 273 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE) 274 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE) 275 set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${flag}" PARENT_SCOPE) 276 else() 277 message(WARNING "${flag} is not supported.") 278 endif() 279endfunction() 280 281if( LLVM_ENABLE_LLD ) 282 if ( LLVM_USE_LINKER ) 283 message(FATAL_ERROR "LLVM_ENABLE_LLD and LLVM_USE_LINKER can't be set at the same time") 284 endif() 285 # In case of MSVC cmake always invokes the linker directly, so the linker 286 # should be specified by CMAKE_LINKER cmake variable instead of by -fuse-ld 287 # compiler option. 288 if ( NOT MSVC ) 289 set(LLVM_USE_LINKER "lld") 290 endif() 291endif() 292 293if( LLVM_USE_LINKER ) 294 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 295 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fuse-ld=${LLVM_USE_LINKER}") 296 check_cxx_source_compiles("int main() { return 0; }" CXX_SUPPORTS_CUSTOM_LINKER) 297 if ( NOT CXX_SUPPORTS_CUSTOM_LINKER ) 298 message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'") 299 endif() 300 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 301 append("-fuse-ld=${LLVM_USE_LINKER}" 302 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 303endif() 304 305if( LLVM_ENABLE_PIC ) 306 if( XCODE ) 307 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't 308 # know how to disable this, so just force ENABLE_PIC off for now. 309 message(WARNING "-fPIC not supported with Xcode.") 310 elseif( WIN32 OR CYGWIN) 311 # On Windows all code is PIC. MinGW warns if -fPIC is used. 312 else() 313 add_flag_or_print_warning("-fPIC" FPIC) 314 # Enable interprocedural optimizations for non-inline functions which would 315 # otherwise be disabled due to GCC -fPIC's default. 316 # Note: GCC<10.3 has a bug on SystemZ. 317 # 318 # Note: Clang allows IPO for -fPIC so this optimization is less effective. 319 # Older Clang may support -fno-semantic-interposition but it used local 320 # aliases to optimize global variables, which is incompatible with copy 321 # relocations due to -fno-pic. 322 if ((CMAKE_COMPILER_IS_GNUCXX AND 323 NOT (LLVM_NATIVE_ARCH STREQUAL "SystemZ" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.3)) 324 OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 13)) 325 add_flag_if_supported("-fno-semantic-interposition" FNO_SEMANTIC_INTERPOSITION) 326 endif() 327 endif() 328 # GCC for MIPS can miscompile LLVM due to PR37701. 329 if(CMAKE_COMPILER_IS_GNUCXX AND LLVM_NATIVE_ARCH STREQUAL "Mips" AND 330 NOT Uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 331 add_flag_or_print_warning("-fno-shrink-wrap" FNO_SHRINK_WRAP) 332 endif() 333 # gcc with -O3 -fPIC generates TLS sequences that violate the spec on 334 # Solaris/sparcv9, causing executables created with the system linker 335 # to SEGV (GCC PR target/96607). 336 # clang with -O3 -fPIC generates code that SEGVs. 337 # Both can be worked around by compiling with -O instead. 338 if(${CMAKE_SYSTEM_NAME} STREQUAL "SunOS" AND LLVM_NATIVE_ARCH STREQUAL "Sparc") 339 llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELEASE "-O[23]" "-O") 340 llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O[23]" "-O") 341 endif() 342endif() 343 344if(NOT WIN32 AND NOT CYGWIN AND NOT (${CMAKE_SYSTEM_NAME} MATCHES "AIX" AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")) 345 # MinGW warns if -fvisibility-inlines-hidden is used. 346 # GCC on AIX warns if -fvisibility-inlines-hidden is used. 347 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 348 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) 349endif() 350 351if(CMAKE_SIZEOF_VOID_P EQUAL 8 AND MINGW) 352 add_definitions( -D_FILE_OFFSET_BITS=64 ) 353endif() 354 355if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 356 # TODO: support other platforms and toolchains. 357 if( LLVM_BUILD_32_BITS ) 358 message(STATUS "Building 32 bits executables and libraries.") 359 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32") 360 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32") 361 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32") 362 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32") 363 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32") 364 365 # FIXME: CMAKE_SIZEOF_VOID_P is still 8 366 add_definitions(-D_LARGEFILE_SOURCE) 367 add_definitions(-D_FILE_OFFSET_BITS=64) 368 endif( LLVM_BUILD_32_BITS ) 369endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 370 371# If building on a GNU specific 32-bit system, make sure off_t is 64 bits 372# so that off_t can stored offset > 2GB. 373# Android until version N (API 24) doesn't support it. 374if (ANDROID AND (ANDROID_NATIVE_API_LEVEL LESS 24)) 375 set(LLVM_FORCE_SMALLFILE_FOR_ANDROID TRUE) 376endif() 377if( CMAKE_SIZEOF_VOID_P EQUAL 4 AND NOT LLVM_FORCE_SMALLFILE_FOR_ANDROID) 378 # FIXME: It isn't handled in LLVM_BUILD_32_BITS. 379 add_definitions( -D_LARGEFILE_SOURCE ) 380 add_definitions( -D_FILE_OFFSET_BITS=64 ) 381endif() 382 383if( XCODE ) 384 # For Xcode enable several build settings that correspond to 385 # many warnings that are on by default in Clang but are 386 # not enabled for historical reasons. For versions of Xcode 387 # that do not support these options they will simply 388 # be ignored. 389 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES") 390 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES") 391 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES") 392 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES") 393 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES") 394 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES") 395 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES") 396 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES") 397 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES") 398 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES") 399 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES") 400 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES") 401 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES") 402 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES") 403 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES") 404endif() 405 406# On Win32 using MS tools, provide an option to set the number of parallel jobs 407# to use. 408if( MSVC_IDE ) 409 set(LLVM_COMPILER_JOBS "0" CACHE STRING 410 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 411 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 412 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 413 add_definitions( /MP ) 414 else() 415 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 416 add_definitions( /MP${LLVM_COMPILER_JOBS} ) 417 endif() 418 else() 419 message(STATUS "Parallel compilation disabled") 420 endif() 421endif() 422 423# set stack reserved size to ~10MB 424if(MSVC) 425 # CMake previously automatically set this value for MSVC builds, but the 426 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default 427 # value (1 MB) which is not enough for us in tasks such as parsing recursive 428 # C++ templates in Clang. 429 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000") 430elseif(MINGW) # FIXME: Also cygwin? 431 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216") 432 433 # Pass -mbig-obj to mingw gas to avoid COFF 2**16 section limit. 434 if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang") 435 append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 436 endif() 437endif() 438 439option(LLVM_ENABLE_WARNINGS "Enable compiler warnings." ON) 440 441if( MSVC ) 442 include(ChooseMSVCCRT) 443 444 # Add definitions that make MSVC much less annoying. 445 add_definitions( 446 # For some reason MS wants to deprecate a bunch of standard functions... 447 -D_CRT_SECURE_NO_DEPRECATE 448 -D_CRT_SECURE_NO_WARNINGS 449 -D_CRT_NONSTDC_NO_DEPRECATE 450 -D_CRT_NONSTDC_NO_WARNINGS 451 -D_SCL_SECURE_NO_DEPRECATE 452 -D_SCL_SECURE_NO_WARNINGS 453 ) 454 455 # Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI. 456 add_definitions( 457 -DUNICODE 458 -D_UNICODE 459 ) 460 461 # Allow setting clang-cl's /winsysroot flag. 462 set(LLVM_WINSYSROOT "" CACHE STRING 463 "If set, argument to clang-cl's /winsysroot") 464 if (LLVM_WINSYSROOT) 465 if (NOT CLANG_CL) 466 message(ERROR "LLVM_WINSYSROOT requires clang-cl") 467 endif() 468 append("/winsysroot${LLVM_WINSYSROOT}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 469 endif() 470 471 if (LLVM_ENABLE_WERROR) 472 append("/WX" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 473 endif (LLVM_ENABLE_WERROR) 474 475 append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 476 477 # Some projects use the __cplusplus preprocessor macro to check support for 478 # a particular version of the C++ standard. When this option is not specified 479 # explicitly, macro's value is "199711L" that implies C++98 Standard. 480 # https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/ 481 append("/Zc:__cplusplus" CMAKE_CXX_FLAGS) 482 483 # Allow users to request PDBs in release mode. CMake offeres the 484 # RelWithDebInfo configuration, but it uses different optimization settings 485 # (/Ob1 vs /Ob2 or -O2 vs -O3). LLVM provides this flag so that users can get 486 # PDBs without changing codegen. 487 option(LLVM_ENABLE_PDB OFF) 488 if (LLVM_ENABLE_PDB AND uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE") 489 append("/Zi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 490 # /DEBUG disables linker GC and ICF, but we want those in Release mode. 491 append("/DEBUG /OPT:REF /OPT:ICF" 492 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS 493 CMAKE_SHARED_LINKER_FLAGS) 494 endif() 495 496 # Get all linker flags in upper case form so we can search them. 497 set(all_linker_flags_uppercase 498 "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_MODULE_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}") 499 string(TOUPPER "${all_linker_flags_uppercase}" all_linker_flags_uppercase) 500 501 if (CLANG_CL AND LINKER_IS_LLD) 502 # If we are using clang-cl with lld-link and /debug is present in any of the 503 # linker flag variables, pass -gcodeview-ghash to the compiler to speed up 504 # linking. This flag is orthogonal from /Zi, /Z7, and other flags that 505 # enable debug info emission, and only has an effect if those are also in 506 # use. 507 string(FIND "${all_linker_flags_uppercase}" "/DEBUG" linker_flag_idx) 508 if (${linker_flag_idx} GREATER -1) 509 add_flag_if_supported("-gcodeview-ghash" GCODEVIEW_GHASH) 510 endif() 511 endif() 512 513 # Disable string literal const->non-const type conversion. 514 # "When specified, the compiler requires strict const-qualification 515 # conformance for pointers initialized by using string literals." 516 append("/Zc:strictStrings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 517 518 # "Generate Intrinsic Functions". 519 append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 520 521 # "Enforce type conversion rules". 522 append("/Zc:rvalueCast" CMAKE_CXX_FLAGS) 523 524 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO) 525 # clang-cl and cl by default produce non-deterministic binaries because 526 # link.exe /incremental requires a timestamp in the .obj file. clang-cl 527 # has the flag /Brepro to force deterministic binaries. We want to pass that 528 # whenever you're building with clang unless you're passing /incremental 529 # or using LTO (/Brepro with LTO would result in a warning about the flag 530 # being unused, because we're not generating object files). 531 # This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag() 532 # because cl.exe does not emit an error on flags it doesn't understand, 533 # letting check_cxx_compiler_flag() claim it understands all flags. 534 check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO) 535 if (SUPPORTS_BREPRO) 536 # Check if /INCREMENTAL is passed to the linker and complain that it 537 # won't work with /Brepro. 538 string(FIND "${all_linker_flags_uppercase}" "/INCREMENTAL" linker_flag_idx) 539 if (${linker_flag_idx} GREATER -1) 540 message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic") 541 else() 542 append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 543 endif() 544 endif() 545 endif() 546 # By default MSVC has a 2^16 limit on the number of sections in an object file, 547 # but in many objects files need more than that. This flag is to increase the 548 # number of sections. 549 append("/bigobj" CMAKE_CXX_FLAGS) 550endif( MSVC ) 551 552# Warnings-as-errors handling for GCC-compatible compilers: 553if ( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 554 append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 555 append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS) 556endif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 557 558# Specific default warnings-as-errors for compilers accepting GCC-compatible warning flags: 559if ( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" ) 560 add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME) 561 add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW) 562endif( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" ) 563 564# Modules enablement for GCC-compatible compilers: 565if ( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES ) 566 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 567 set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache") 568 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin") 569 # On Darwin -fmodules does not imply -fcxx-modules. 570 set(module_flags "${module_flags} -fcxx-modules") 571 endif() 572 if (LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY) 573 set(module_flags "${module_flags} -Xclang -fmodules-local-submodule-visibility") 574 endif() 575 if (LLVM_ENABLE_MODULE_DEBUGGING AND 576 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR 577 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO"))) 578 set(module_flags "${module_flags} -gmodules") 579 endif() 580 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${module_flags}") 581 582 # Check that we can build code with modules enabled, and that repeatedly 583 # including <cassert> still manages to respect NDEBUG properly. 584 CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG 585 #include <cassert> 586 #define NDEBUG 587 #include <cassert> 588 int main() { assert(this code is not compiled); }" 589 CXX_SUPPORTS_MODULES) 590 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 591 if (CXX_SUPPORTS_MODULES) 592 append("${module_flags}" CMAKE_CXX_FLAGS) 593 else() 594 message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler") 595 endif() 596endif( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES ) 597 598if (MSVC) 599 if (NOT CLANG_CL) 600 set(msvc_warning_flags 601 # Disabled warnings. 602 -wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline) 603 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 604 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 605 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 606 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' 607 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 608 -wd4456 # Suppress 'declaration of 'var' hides local variable' 609 -wd4457 # Suppress 'declaration of 'var' hides function parameter' 610 -wd4458 # Suppress 'declaration of 'var' hides class member' 611 -wd4459 # Suppress 'declaration of 'var' hides global declaration' 612 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 613 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 614 -wd4722 # Suppress 'function' : destructor never returns, potential memory leak 615 -wd4100 # Suppress 'unreferenced formal parameter' 616 -wd4127 # Suppress 'conditional expression is constant' 617 -wd4512 # Suppress 'assignment operator could not be generated' 618 -wd4505 # Suppress 'unreferenced local function has been removed' 619 -wd4610 # Suppress '<class> can never be instantiated' 620 -wd4510 # Suppress 'default constructor could not be generated' 621 -wd4702 # Suppress 'unreachable code' 622 -wd4245 # Suppress ''conversion' : conversion from 'type1' to 'type2', signed/unsigned mismatch' 623 -wd4706 # Suppress 'assignment within conditional expression' 624 -wd4310 # Suppress 'cast truncates constant value' 625 -wd4701 # Suppress 'potentially uninitialized local variable' 626 -wd4703 # Suppress 'potentially uninitialized local pointer variable' 627 -wd4389 # Suppress 'signed/unsigned mismatch' 628 -wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable' 629 -wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation' 630 -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer' 631 -wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed' 632 -wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared' 633 # C4592 is disabled because of false positives in Visual Studio 2015 634 # Update 1. Re-evaluate the usefulness of this diagnostic with Update 2. 635 -wd4592 # Suppress ''var': symbol will be dynamically initialized (implementation limitation) 636 -wd4319 # Suppress ''operator' : zero extending 'type' to 'type' of greater size' 637 # C4709 is disabled because of a bug with Visual Studio 2017 as of 638 # v15.8.8. Re-evaluate the usefulness of this diagnostic when the bug 639 # is fixed. 640 -wd4709 # Suppress comma operator within array index expression 641 642 # Ideally, we'd like this warning to be enabled, but even MSVC 2019 doesn't 643 # support the 'aligned' attribute in the way that clang sources requires (for 644 # any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to 645 # avoid unwanted alignment warnings. 646 -wd4324 # Suppress 'structure was padded due to __declspec(align())' 647 648 # Promoted warnings. 649 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 650 651 # Promoted warnings to errors. 652 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 653 ) 654 endif(NOT CLANG_CL) 655 656 # Enable warnings 657 if (LLVM_ENABLE_WARNINGS) 658 # Put /W4 in front of all the -we flags. cl.exe doesn't care, but for 659 # clang-cl having /W4 after the -we flags will re-enable the warnings 660 # disabled by -we. 661 set(msvc_warning_flags "/W4 ${msvc_warning_flags}") 662 # CMake appends /W3 by default, and having /W3 followed by /W4 will result in 663 # cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is 664 # a command line warning and not a compiler warning, it cannot be suppressed except 665 # by fixing the command line. 666 string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") 667 string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 668 669 if (LLVM_ENABLE_PEDANTIC) 670 # No MSVC equivalent available 671 endif (LLVM_ENABLE_PEDANTIC) 672 endif (LLVM_ENABLE_WARNINGS) 673 674 foreach(flag ${msvc_warning_flags}) 675 append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 676 endforeach(flag) 677endif (MSVC) 678 679if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 680 681 # Don't add -Wall for clang-cl, because it maps -Wall to -Weverything for 682 # MSVC compatibility. /W4 is added above instead. 683 if (NOT CLANG_CL) 684 append("-Wall" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 685 endif() 686 687 append("-Wextra -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 688 append("-Wcast-qual" CMAKE_CXX_FLAGS) 689 690 # Turn off missing field initializer warnings for gcc to avoid noise from 691 # false positives with empty {}. Turn them on otherwise (they're off by 692 # default for clang). 693 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 694 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 695 if (CMAKE_COMPILER_IS_GNUCXX) 696 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 697 else() 698 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 699 endif() 700 endif() 701 702 if (LLVM_ENABLE_PEDANTIC AND LLVM_COMPILER_IS_GCC_COMPATIBLE) 703 append("-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 704 append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 705 706 # GCC warns about redundant toplevel semicolons (enabled by -pedantic 707 # above), while Clang doesn't. Enable the corresponding Clang option to 708 # pick up on these even in builds with Clang. 709 add_flag_if_supported("-Wc++98-compat-extra-semi" CXX98_COMPAT_EXTRA_SEMI_FLAG) 710 endif() 711 712 add_flag_if_supported("-Wimplicit-fallthrough" IMPLICIT_FALLTHROUGH_FLAG) 713 add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG) 714 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS) 715 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS) 716 717 # Disable -Wclass-memaccess, a C++-only warning from GCC 8 that fires on 718 # LLVM's ADT classes. 719 check_cxx_compiler_flag("-Wclass-memaccess" CXX_SUPPORTS_CLASS_MEMACCESS_FLAG) 720 append_if(CXX_SUPPORTS_CLASS_MEMACCESS_FLAG "-Wno-class-memaccess" CMAKE_CXX_FLAGS) 721 722 # Disable -Wredundant-move and -Wpessimizing-move on GCC>=9. GCC wants to 723 # remove std::move in code like "A foo(ConvertibleToA a) { 724 # return std::move(a); }", but this code does not compile (or uses the copy 725 # constructor instead) on clang<=3.8. Clang also has a -Wredundant-move and 726 # -Wpessimizing-move, but they only fire when the types match exactly, so we 727 # can keep them here. 728 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU") 729 check_cxx_compiler_flag("-Wredundant-move" CXX_SUPPORTS_REDUNDANT_MOVE_FLAG) 730 append_if(CXX_SUPPORTS_REDUNDANT_MOVE_FLAG "-Wno-redundant-move" CMAKE_CXX_FLAGS) 731 check_cxx_compiler_flag("-Wpessimizing-move" CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG) 732 append_if(CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG "-Wno-pessimizing-move" CMAKE_CXX_FLAGS) 733 endif() 734 735 # The LLVM libraries have no stable C++ API, so -Wnoexcept-type is not useful. 736 check_cxx_compiler_flag("-Wnoexcept-type" CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG) 737 append_if(CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG "-Wno-noexcept-type" CMAKE_CXX_FLAGS) 738 739 # Check if -Wnon-virtual-dtor warns even though the class is marked final. 740 # If it does, don't add it. So it won't be added on clang 3.4 and older. 741 # This also catches cases when -Wnon-virtual-dtor isn't supported by 742 # the compiler at all. This flag is not activated for gcc since it will 743 # incorrectly identify a protected non-virtual base when there is a friend 744 # declaration. Don't activate this in general on Windows as this warning has 745 # too many false positives on COM-style classes, which are destroyed with 746 # Release() (PR32286). 747 if (NOT CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32) 748 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 749 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11 -Werror=non-virtual-dtor") 750 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();protected: ~base();}; 751 class derived final : public base { public: ~derived();}; 752 int main() { return 0; }" 753 CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR) 754 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 755 append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR 756 "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS) 757 endif() 758 759 # Enable -Wdelete-non-virtual-dtor if available. 760 add_flag_if_supported("-Wdelete-non-virtual-dtor" DELETE_NON_VIRTUAL_DTOR_FLAG) 761 762 # Enable -Wsuggest-override if it's available, and only if it doesn't 763 # suggest adding 'override' to functions that are already marked 'final' 764 # (which means it is disabled for GCC < 9.2). 765 check_cxx_compiler_flag("-Wsuggest-override" CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG) 766 if (CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG) 767 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 768 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=suggest-override") 769 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();}; 770 class derived : base {public: void anchor() final;}; 771 int main() { return 0; }" 772 CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL) 773 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 774 append_if(CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL "-Wsuggest-override" CMAKE_CXX_FLAGS) 775 endif() 776 777 # Check if -Wcomment is OK with an // comment ending with '\' if the next 778 # line is also a // comment. 779 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 780 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment") 781 CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main() {return 0;}" 782 C_WCOMMENT_ALLOWS_LINE_WRAP) 783 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 784 if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP) 785 append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 786 endif() 787 788 # Enable -Wstring-conversion to catch misuse of string literals. 789 add_flag_if_supported("-Wstring-conversion" STRING_CONVERSION_FLAG) 790 791 # Prevent bugs that can happen with llvm's brace style. 792 add_flag_if_supported("-Wmisleading-indentation" MISLEADING_INDENTATION_FLAG) 793endif (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 794 795if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT LLVM_ENABLE_WARNINGS) 796 append("-w" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 797endif() 798 799macro(append_common_sanitizer_flags) 800 if (NOT MSVC) 801 # Append -fno-omit-frame-pointer and turn on debug info to get better 802 # stack traces. 803 add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER) 804 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 805 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 806 add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY) 807 endif() 808 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large. 809 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND LLVM_OPTIMIZE_SANITIZED_BUILDS) 810 add_flag_if_supported("-O1" O1) 811 endif() 812 elseif (CLANG_CL) 813 # Keep frame pointers around. 814 append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 815 # Always ask the linker to produce symbols with asan. 816 append("/Z7" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 817 append("-debug" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 818 endif() 819endmacro() 820 821# Turn on sanitizers if necessary. 822if(LLVM_USE_SANITIZER) 823 if (LLVM_ON_UNIX) 824 if (LLVM_USE_SANITIZER STREQUAL "Address") 825 append_common_sanitizer_flags() 826 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 827 elseif (LLVM_USE_SANITIZER STREQUAL "HWAddress") 828 append_common_sanitizer_flags() 829 append("-fsanitize=hwaddress" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 830 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 831 append_common_sanitizer_flags() 832 append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 833 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 834 append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 835 endif() 836 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 837 append_common_sanitizer_flags() 838 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 839 elseif (LLVM_USE_SANITIZER STREQUAL "Thread") 840 append_common_sanitizer_flags() 841 append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 842 elseif (LLVM_USE_SANITIZER STREQUAL "DataFlow") 843 append("-fsanitize=dataflow" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 844 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 845 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 846 append_common_sanitizer_flags() 847 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 848 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 849 elseif (LLVM_USE_SANITIZER STREQUAL "Leaks") 850 append_common_sanitizer_flags() 851 append("-fsanitize=leak" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 852 else() 853 message(FATAL_ERROR "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 854 endif() 855 elseif(MINGW) 856 if (LLVM_USE_SANITIZER STREQUAL "Address") 857 append_common_sanitizer_flags() 858 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 859 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 860 append_common_sanitizer_flags() 861 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 862 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 863 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 864 append_common_sanitizer_flags() 865 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 866 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 867 else() 868 message(FATAL_ERROR "This sanitizer not yet supported in a MinGW environment: ${LLVM_USE_SANITIZER}") 869 endif() 870 elseif(MSVC) 871 if (LLVM_USE_SANITIZER STREQUAL "Address") 872 append_common_sanitizer_flags() 873 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 874 else() 875 message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}") 876 endif() 877 else() 878 message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.") 879 endif() 880 if (LLVM_USE_SANITIZER MATCHES "(Undefined;)?Address(;Undefined)?") 881 add_flag_if_supported("-fsanitize-address-use-after-scope" 882 FSANITIZE_USE_AFTER_SCOPE_FLAG) 883 endif() 884 if (LLVM_USE_SANITIZE_COVERAGE) 885 append("-fsanitize=fuzzer-no-link" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 886 endif() 887 if (LLVM_USE_SANITIZER MATCHES ".*Undefined.*") 888 set(BLACKLIST_FILE "${CMAKE_SOURCE_DIR}/utils/sanitizers/ubsan_blacklist.txt") 889 if (EXISTS "${BLACKLIST_FILE}") 890 append("-fsanitize-blacklist=${BLACKLIST_FILE}" 891 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 892 endif() 893 endif() 894endif() 895 896# Turn on -gsplit-dwarf if requested in debug builds. 897if (LLVM_USE_SPLIT_DWARF AND 898 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR 899 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO"))) 900 # Limit to clang and gcc so far. Add compilers supporting this option. 901 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR 902 CMAKE_CXX_COMPILER_ID STREQUAL "GNU") 903 add_compile_options(-gsplit-dwarf) 904 endif() 905endif() 906 907add_definitions( -D__STDC_CONSTANT_MACROS ) 908add_definitions( -D__STDC_FORMAT_MACROS ) 909add_definitions( -D__STDC_LIMIT_MACROS ) 910 911# clang and gcc don't default-print colored diagnostics when invoked from Ninja. 912if (UNIX AND 913 CMAKE_GENERATOR STREQUAL "Ninja" AND 914 (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR 915 (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND 916 NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)))) 917 append("-fdiagnostics-color" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 918endif() 919 920# lld doesn't print colored diagnostics when invoked from Ninja 921if (UNIX AND CMAKE_GENERATOR STREQUAL "Ninja") 922 include(LLVMCheckLinkerFlag) 923 llvm_check_linker_flag(CXX "-Wl,--color-diagnostics" LINKER_SUPPORTS_COLOR_DIAGNOSTICS) 924 append_if(LINKER_SUPPORTS_COLOR_DIAGNOSTICS "-Wl,--color-diagnostics" 925 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 926endif() 927 928# Add flags for add_dead_strip(). 929# FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF? 930# But MinSizeRel seems to add that automatically, so maybe disable these 931# flags instead if LLVM_NO_DEAD_STRIP is set. 932if(NOT CYGWIN AND NOT MSVC) 933 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND 934 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 935 check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS) 936 if (C_SUPPORTS_FNO_FUNCTION_SECTIONS) 937 # Don't add -ffunction-sections if it can't be disabled with -fno-function-sections. 938 # Doing so will break sanitizers. 939 add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS) 940 elseif (CMAKE_CXX_COMPILER_ID MATCHES "XL") 941 append("-qfuncsect" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 942 endif() 943 add_flag_if_supported("-fdata-sections" FDATA_SECTIONS) 944 endif() 945elseif(MSVC) 946 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 947 append("/Gw" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 948 endif() 949endif() 950 951if(MSVC) 952 # Remove flags here, for exceptions and RTTI. 953 # Each target property or source property should be responsible to control 954 # them. 955 # CL.EXE complains to override flags like "/GR /GR-". 956 string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 957 string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 958endif() 959 960# Provide public options to globally control RTTI and EH 961option(LLVM_ENABLE_EH "Enable Exception handling" OFF) 962option(LLVM_ENABLE_RTTI "Enable run time type information" OFF) 963if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI) 964 message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON") 965endif() 966 967option(LLVM_USE_NEWPM "Build LLVM using the experimental new pass manager" Off) 968mark_as_advanced(LLVM_USE_NEWPM) 969if (LLVM_USE_NEWPM) 970 append("-fexperimental-new-pass-manager" 971 CMAKE_CXX_FLAGS 972 CMAKE_C_FLAGS 973 CMAKE_EXE_LINKER_FLAGS 974 CMAKE_SHARED_LINKER_FLAGS) 975endif() 976 977option(LLVM_ENABLE_IR_PGO "Build LLVM and tools with IR PGO instrumentation (deprecated)" Off) 978mark_as_advanced(LLVM_ENABLE_IR_PGO) 979 980set(LLVM_BUILD_INSTRUMENTED OFF CACHE STRING "Build LLVM and tools with PGO instrumentation. May be specified as IR or Frontend") 981set(LLVM_VP_COUNTERS_PER_SITE "1.5" CACHE STRING "Value profile counters to use per site for IR PGO with Clang") 982mark_as_advanced(LLVM_BUILD_INSTRUMENTED LLVM_VP_COUNTERS_PER_SITE) 983string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED) 984 985if (LLVM_BUILD_INSTRUMENTED) 986 if (LLVM_ENABLE_IR_PGO OR uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "IR") 987 append("-fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\"" 988 CMAKE_CXX_FLAGS 989 CMAKE_C_FLAGS) 990 if(NOT LINKER_IS_LLD_LINK) 991 append("-fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\"" 992 CMAKE_EXE_LINKER_FLAGS 993 CMAKE_SHARED_LINKER_FLAGS) 994 endif() 995 # Set this to avoid running out of the value profile node section 996 # under clang in dynamic linking mode. 997 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND 998 CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 11 AND 999 LLVM_LINK_LLVM_DYLIB) 1000 append("-Xclang -mllvm -Xclang -vp-counters-per-site=${LLVM_VP_COUNTERS_PER_SITE}" 1001 CMAKE_CXX_FLAGS 1002 CMAKE_C_FLAGS) 1003 endif() 1004 elseif(uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "CSIR") 1005 append("-fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\"" 1006 CMAKE_CXX_FLAGS 1007 CMAKE_C_FLAGS) 1008 if(NOT LINKER_IS_LLD_LINK) 1009 append("-fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\"" 1010 CMAKE_EXE_LINKER_FLAGS 1011 CMAKE_SHARED_LINKER_FLAGS) 1012 endif() 1013 else() 1014 append("-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\"" 1015 CMAKE_CXX_FLAGS 1016 CMAKE_C_FLAGS) 1017 if(NOT LINKER_IS_LLD_LINK) 1018 append("-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\"" 1019 CMAKE_EXE_LINKER_FLAGS 1020 CMAKE_SHARED_LINKER_FLAGS) 1021 endif() 1022 endif() 1023endif() 1024 1025# When using clang-cl with an instrumentation-based tool, add clang's library 1026# resource directory to the library search path. Because cmake invokes the 1027# linker directly, it isn't sufficient to pass -fsanitize=* to the linker. 1028if (CLANG_CL AND (LLVM_BUILD_INSTRUMENTED OR LLVM_USE_SANITIZER)) 1029 execute_process( 1030 COMMAND ${CMAKE_CXX_COMPILER} /clang:-print-libgcc-file-name /clang:--rtlib=compiler-rt 1031 OUTPUT_VARIABLE clang_compiler_rt_file 1032 ERROR_VARIABLE clang_cl_stderr 1033 OUTPUT_STRIP_TRAILING_WHITESPACE 1034 ERROR_STRIP_TRAILING_WHITESPACE 1035 RESULT_VARIABLE clang_cl_exit_code) 1036 if (NOT "${clang_cl_exit_code}" STREQUAL "0") 1037 message(FATAL_ERROR 1038 "Unable to invoke clang-cl to find resource dir: ${clang_cl_stderr}") 1039 endif() 1040 file(TO_CMAKE_PATH "${clang_compiler_rt_file}" clang_compiler_rt_file) 1041 get_filename_component(clang_runtime_dir "${clang_compiler_rt_file}" DIRECTORY) 1042 append("/libpath:${clang_runtime_dir}" 1043 CMAKE_EXE_LINKER_FLAGS 1044 CMAKE_MODULE_LINKER_FLAGS 1045 CMAKE_SHARED_LINKER_FLAGS) 1046endif() 1047 1048if(LLVM_PROFDATA_FILE AND EXISTS ${LLVM_PROFDATA_FILE}) 1049 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" ) 1050 append("-fprofile-instr-use=\"${LLVM_PROFDATA_FILE}\"" 1051 CMAKE_CXX_FLAGS 1052 CMAKE_C_FLAGS) 1053 if(NOT LINKER_IS_LLD_LINK) 1054 append("-fprofile-instr-use=\"${LLVM_PROFDATA_FILE}\"" 1055 CMAKE_EXE_LINKER_FLAGS 1056 CMAKE_SHARED_LINKER_FLAGS) 1057 endif() 1058 else() 1059 message(FATAL_ERROR "LLVM_PROFDATA_FILE can only be specified when compiling with clang") 1060 endif() 1061endif() 1062 1063option(LLVM_BUILD_INSTRUMENTED_COVERAGE "Build LLVM and tools with Code Coverage instrumentation" Off) 1064mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE) 1065append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\" -fcoverage-mapping" 1066 CMAKE_CXX_FLAGS 1067 CMAKE_C_FLAGS 1068 CMAKE_EXE_LINKER_FLAGS 1069 CMAKE_SHARED_LINKER_FLAGS) 1070 1071if (LLVM_BUILD_INSTRUMENTED AND LLVM_BUILD_INSTRUMENTED_COVERAGE) 1072 message(FATAL_ERROR "LLVM_BUILD_INSTRUMENTED and LLVM_BUILD_INSTRUMENTED_COVERAGE cannot both be specified") 1073endif() 1074 1075if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK AND NOT MINGW) 1076 message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)") 1077endif() 1078if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 1079 append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 1080 if(NOT LINKER_IS_LLD_LINK) 1081 append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1082 endif() 1083 # If the linker supports it, enable the lto cache. This improves initial build 1084 # time a little since we re-link a lot of the same objects, and significantly 1085 # improves incremental build time. 1086 # FIXME: We should move all this logic into the clang driver. 1087 if(APPLE) 1088 append("-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache" 1089 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1090 elseif((UNIX OR MINGW) AND LLVM_USE_LINKER STREQUAL "lld") 1091 append("-Wl,--thinlto-cache-dir=${PROJECT_BINARY_DIR}/lto.cache" 1092 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1093 elseif(LLVM_USE_LINKER STREQUAL "gold") 1094 append("-Wl,--plugin-opt,cache-dir=${PROJECT_BINARY_DIR}/lto.cache" 1095 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1096 elseif(LINKER_IS_LLD_LINK) 1097 append("/lldltocache:${PROJECT_BINARY_DIR}/lto.cache" 1098 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1099 endif() 1100elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL") 1101 append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 1102 if(NOT LINKER_IS_LLD_LINK) 1103 append("-flto=full" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1104 endif() 1105elseif(LLVM_ENABLE_LTO) 1106 append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 1107 if(NOT LINKER_IS_LLD_LINK) 1108 append("-flto" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1109 endif() 1110endif() 1111 1112# Set an AIX default for LLVM_EXPORT_SYMBOLS_FOR_PLUGINS based on whether we are 1113# doing dynamic linking (see below). 1114set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default OFF) 1115if (NOT (BUILD_SHARED_LIBS OR LLVM_LINK_LLVM_DYLIB)) 1116 set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default ON) 1117endif() 1118 1119# This option makes utils/extract_symbols.py be used to determine the list of 1120# symbols to export from LLVM tools. This is necessary when on AIX or when using 1121# MSVC if you want to allow plugins. On AIX we don't show this option, and we 1122# enable it by default except when the LLVM libraries are set up for dynamic 1123# linking (due to incompatibility). With MSVC, note that the plugin has to 1124# explicitly link against (exactly one) tool so we can't unilaterally turn on 1125# LLVM_ENABLE_PLUGINS when it's enabled. 1126CMAKE_DEPENDENT_OPTION(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS 1127 "Export symbols from LLVM tools so that plugins can import them" OFF 1128 "NOT ${CMAKE_SYSTEM_NAME} MATCHES AIX" ${LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default}) 1129if(BUILD_SHARED_LIBS AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 1130 message(FATAL_ERROR "BUILD_SHARED_LIBS not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 1131endif() 1132if(LLVM_LINK_LLVM_DYLIB AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 1133 message(FATAL_ERROR "LLVM_LINK_LLVM_DYLIB not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 1134endif() 1135 1136# By default we should enable LLVM_ENABLE_IDE only for multi-configuration 1137# generators. This option disables optional build system features that make IDEs 1138# less usable. 1139set(LLVM_ENABLE_IDE_default OFF) 1140if (CMAKE_CONFIGURATION_TYPES) 1141 set(LLVM_ENABLE_IDE_default ON) 1142endif() 1143option(LLVM_ENABLE_IDE 1144 "Disable optional build system features that cause problems for IDE generators" 1145 ${LLVM_ENABLE_IDE_default}) 1146if (CMAKE_CONFIGURATION_TYPES AND NOT LLVM_ENABLE_IDE) 1147 message(WARNING "Disabling LLVM_ENABLE_IDE on multi-configuration generators is not recommended.") 1148endif() 1149 1150function(get_compile_definitions) 1151 get_directory_property(top_dir_definitions DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS) 1152 foreach(definition ${top_dir_definitions}) 1153 if(DEFINED result) 1154 string(APPEND result " -D${definition}") 1155 else() 1156 set(result "-D${definition}") 1157 endif() 1158 endforeach() 1159 set(LLVM_DEFINITIONS "${result}" PARENT_SCOPE) 1160endfunction() 1161get_compile_definitions() 1162 1163option(LLVM_FORCE_ENABLE_STATS "Enable statistics collection for builds that wouldn't normally enable it" OFF) 1164 1165check_symbol_exists(os_signpost_interval_begin "os/signpost.h" macos_signposts_available) 1166if(macos_signposts_available) 1167 check_cxx_source_compiles( 1168 "#include <os/signpost.h> 1169 int main() { os_signpost_interval_begin(nullptr, 0, \"\", \"\"); return 0; }" 1170 macos_signposts_usable) 1171 if(macos_signposts_usable) 1172 set(LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS "WITH_ASSERTS" CACHE STRING 1173 "Enable support for Xcode signposts. Can be WITH_ASSERTS, FORCE_ON, FORCE_OFF") 1174 string(TOUPPER "${LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS}" 1175 uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS) 1176 if( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "WITH_ASSERTS" ) 1177 if( LLVM_ENABLE_ASSERTIONS ) 1178 set( LLVM_SUPPORT_XCODE_SIGNPOSTS 1 ) 1179 endif() 1180 elseif( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "FORCE_ON" ) 1181 set( LLVM_SUPPORT_XCODE_SIGNPOSTS 1 ) 1182 elseif( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "FORCE_OFF" ) 1183 # We don't need to do anything special to turn off signposts. 1184 elseif( NOT DEFINED LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS ) 1185 # Treat LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS like "FORCE_OFF" when it has not been 1186 # defined. 1187 else() 1188 message(FATAL_ERROR "Unknown value for LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS:" 1189 " \"${LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS}\"!") 1190 endif() 1191 endif() 1192endif() 1193 1194set(LLVM_SOURCE_PREFIX "" CACHE STRING "Use prefix for sources") 1195 1196option(LLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO "Use relative paths in debug info" OFF) 1197 1198if(LLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO) 1199 check_c_compiler_flag("-fdebug-prefix-map=foo=bar" SUPPORTS_FDEBUG_PREFIX_MAP) 1200 if(LLVM_ENABLE_PROJECTS_USED) 1201 get_filename_component(source_root "${LLVM_MAIN_SRC_DIR}/.." ABSOLUTE) 1202 else() 1203 set(source_root "${LLVM_MAIN_SRC_DIR}") 1204 endif() 1205 file(RELATIVE_PATH relative_root "${source_root}" "${CMAKE_BINARY_DIR}") 1206 append_if(SUPPORTS_FDEBUG_PREFIX_MAP "-fdebug-prefix-map=${CMAKE_BINARY_DIR}=${relative_root}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1207 append_if(SUPPORTS_FDEBUG_PREFIX_MAP "-fdebug-prefix-map=${source_root}/=${LLVM_SOURCE_PREFIX}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1208 add_flag_if_supported("-no-canonical-prefixes" NO_CANONICAL_PREFIXES) 1209endif() 1210 1211option(LLVM_USE_RELATIVE_PATHS_IN_FILES "Use relative paths in sources and debug info" OFF) 1212 1213if(LLVM_USE_RELATIVE_PATHS_IN_FILES) 1214 check_c_compiler_flag("-ffile-prefix-map=foo=bar" SUPPORTS_FFILE_PREFIX_MAP) 1215 if(LLVM_ENABLE_PROJECTS_USED) 1216 get_filename_component(source_root "${LLVM_MAIN_SRC_DIR}/.." ABSOLUTE) 1217 else() 1218 set(source_root "${LLVM_MAIN_SRC_DIR}") 1219 endif() 1220 file(RELATIVE_PATH relative_root "${source_root}" "${CMAKE_BINARY_DIR}") 1221 append_if(SUPPORTS_FFILE_PREFIX_MAP "-ffile-prefix-map=${CMAKE_BINARY_DIR}=${relative_root}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1222 append_if(SUPPORTS_FFILE_PREFIX_MAP "-ffile-prefix-map=${source_root}/=${LLVM_SOURCE_PREFIX}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1223 add_flag_if_supported("-no-canonical-prefixes" NO_CANONICAL_PREFIXES) 1224endif() 1225 1226if(LLVM_INCLUDE_TESTS) 1227 # Lit test suite requires at least python 3.6 1228 set(LLVM_MINIMUM_PYTHON_VERSION 3.6) 1229else() 1230 # FIXME: it is unknown if this is the actual minimum bound 1231 set(LLVM_MINIMUM_PYTHON_VERSION 3.0) 1232endif() 1233