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_definitions( -D_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 # NOTE: use `add_compile_options` rather than `add_definitions` since 70 # `add_definitions` does not support generator expressions. 71 add_compile_options($<$<OR:$<COMPILE_LANGUAGE:C>,$<COMPILE_LANGUAGE:CXX>>:-UNDEBUG>) 72 if (MSVC) 73 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines. 74 foreach (flags_var_to_scrub 75 CMAKE_CXX_FLAGS_RELEASE 76 CMAKE_CXX_FLAGS_RELWITHDEBINFO 77 CMAKE_CXX_FLAGS_MINSIZEREL 78 CMAKE_C_FLAGS_RELEASE 79 CMAKE_C_FLAGS_RELWITHDEBINFO 80 CMAKE_C_FLAGS_MINSIZEREL) 81 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " " 82 "${flags_var_to_scrub}" "${${flags_var_to_scrub}}") 83 endforeach() 84 endif() 85 endif() 86endif() 87 88if(LLVM_ENABLE_EXPENSIVE_CHECKS) 89 add_definitions(-DEXPENSIVE_CHECKS) 90 91 # In some libstdc++ versions, std::min_element is not constexpr when 92 # _GLIBCXX_DEBUG is enabled. 93 CHECK_CXX_SOURCE_COMPILES(" 94 #define _GLIBCXX_DEBUG 95 #include <algorithm> 96 int main(int argc, char** argv) { 97 static constexpr int data[] = {0, 1}; 98 constexpr const int* min_elt = std::min_element(&data[0], &data[2]); 99 return 0; 100 }" CXX_SUPPORTS_GLIBCXX_DEBUG) 101 if(CXX_SUPPORTS_GLIBCXX_DEBUG) 102 add_definitions(-D_GLIBCXX_DEBUG) 103 else() 104 add_definitions(-D_GLIBCXX_ASSERTIONS) 105 endif() 106endif() 107 108if (LLVM_ENABLE_STRICT_FIXED_SIZE_VECTORS) 109 add_definitions(-DSTRICT_FIXED_SIZE_VECTORS) 110endif() 111 112string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS) 113 114if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" ) 115 if( LLVM_ENABLE_ASSERTIONS ) 116 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 117 endif() 118elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" ) 119 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 120elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" ) 121 # We don't need to do anything special to turn off ABI breaking checks. 122elseif( NOT DEFINED LLVM_ABI_BREAKING_CHECKS ) 123 # Treat LLVM_ABI_BREAKING_CHECKS like "FORCE_OFF" when it has not been 124 # defined. 125else() 126 message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!") 127endif() 128 129if( LLVM_REVERSE_ITERATION ) 130 set( LLVM_ENABLE_REVERSE_ITERATION 1 ) 131endif() 132 133if(WIN32) 134 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 135 if(CYGWIN) 136 set(LLVM_ON_WIN32 0) 137 set(LLVM_ON_UNIX 1) 138 else(CYGWIN) 139 set(LLVM_ON_WIN32 1) 140 set(LLVM_ON_UNIX 0) 141 endif(CYGWIN) 142else(WIN32) 143 if(FUCHSIA OR UNIX) 144 set(LLVM_ON_WIN32 0) 145 set(LLVM_ON_UNIX 1) 146 if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "AIX") 147 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 148 else() 149 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1) 150 endif() 151 else(FUCHSIA OR UNIX) 152 MESSAGE(SEND_ERROR "Unable to determine platform") 153 endif(FUCHSIA OR UNIX) 154endif(WIN32) 155 156if (CMAKE_SYSTEM_NAME MATCHES "OS390") 157 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 158endif() 159 160set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX}) 161set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 162 163# We use *.dylib rather than *.so on darwin, but we stick with *.so on AIX. 164if(${CMAKE_SYSTEM_NAME} MATCHES "AIX") 165 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_MODULE_SUFFIX}) 166else() 167 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 168endif() 169 170if(APPLE) 171 # Darwin-specific linker flags for loadable modules. 172 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress") 173endif() 174 175if(${CMAKE_SYSTEM_NAME} MATCHES "Linux") 176 # RHEL7 has ar and ranlib being non-deterministic by default. The D flag forces determinism, 177 # however only GNU version of ar and ranlib (2.27) have this option. 178 # RHEL DTS7 is also affected by this, which uses GNU binutils 2.28 179 execute_process(COMMAND ${CMAKE_AR} rD t.a 180 WORKING_DIRECTORY ${CMAKE_BINARY_DIR} 181 RESULT_VARIABLE AR_RESULT 182 OUTPUT_QUIET 183 ERROR_QUIET 184 ) 185 if(${AR_RESULT} EQUAL 0) 186 execute_process(COMMAND ${CMAKE_RANLIB} -D t.a 187 WORKING_DIRECTORY ${CMAKE_BINARY_DIR} 188 RESULT_VARIABLE RANLIB_RESULT 189 OUTPUT_QUIET 190 ERROR_QUIET 191 ) 192 if(${RANLIB_RESULT} EQUAL 0) 193 set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>" 194 CACHE STRING "archive create command") 195 set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>") 196 set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>" CACHE STRING "ranlib command") 197 198 set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>" 199 CACHE STRING "archive create command") 200 set(CMAKE_CXX_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>") 201 set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>" CACHE STRING "ranlib command") 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 281function(has_msvc_incremental_no_flag flags incr_no_flag_on) 282 set(${incr_no_flag_on} OFF PARENT_SCOPE) 283 string(FIND "${flags}" "/INCREMENTAL" idx REVERSE) 284 if (${idx} GREATER -1) 285 string(SUBSTRING "${flags}" ${idx} 15 no_flag) 286 if (${no_flag} MATCHES "/INCREMENTAL:NO") 287 set(${incr_no_flag_on} ON PARENT_SCOPE) 288 endif() 289 endif() 290endfunction() 291 292if( LLVM_ENABLE_LLD ) 293 if ( LLVM_USE_LINKER ) 294 message(FATAL_ERROR "LLVM_ENABLE_LLD and LLVM_USE_LINKER can't be set at the same time") 295 endif() 296 # In case of MSVC cmake always invokes the linker directly, so the linker 297 # should be specified by CMAKE_LINKER cmake variable instead of by -fuse-ld 298 # compiler option. 299 if ( NOT MSVC ) 300 set(LLVM_USE_LINKER "lld") 301 endif() 302endif() 303 304if( LLVM_USE_LINKER ) 305 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 306 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fuse-ld=${LLVM_USE_LINKER}") 307 check_cxx_source_compiles("int main() { return 0; }" CXX_SUPPORTS_CUSTOM_LINKER) 308 if ( NOT CXX_SUPPORTS_CUSTOM_LINKER ) 309 message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'") 310 endif() 311 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 312 append("-fuse-ld=${LLVM_USE_LINKER}" 313 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 314endif() 315 316if( LLVM_ENABLE_PIC ) 317 if( XCODE ) 318 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't 319 # know how to disable this, so just force ENABLE_PIC off for now. 320 message(WARNING "-fPIC not supported with Xcode.") 321 elseif( WIN32 OR CYGWIN) 322 # On Windows all code is PIC. MinGW warns if -fPIC is used. 323 else() 324 add_flag_or_print_warning("-fPIC" FPIC) 325 # Enable interprocedural optimizations for non-inline functions which would 326 # otherwise be disabled due to GCC -fPIC's default. 327 # Note: GCC<10.3 has a bug on SystemZ. 328 # 329 # Note: Clang allows IPO for -fPIC so this optimization is less effective. 330 # Clang 13 has a bug related to -fsanitize-coverage 331 # -fno-semantic-interposition (https://reviews.llvm.org/D117183). 332 if ((CMAKE_COMPILER_IS_GNUCXX AND 333 NOT (LLVM_NATIVE_ARCH STREQUAL "SystemZ" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.3)) 334 OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION GREATER_EQUAL 14)) 335 add_flag_if_supported("-fno-semantic-interposition" FNO_SEMANTIC_INTERPOSITION) 336 endif() 337 endif() 338 # GCC for MIPS can miscompile LLVM due to PR37701. 339 if(CMAKE_COMPILER_IS_GNUCXX AND LLVM_NATIVE_ARCH STREQUAL "Mips" AND 340 NOT Uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 341 add_flag_or_print_warning("-fno-shrink-wrap" FNO_SHRINK_WRAP) 342 endif() 343 # gcc with -O3 -fPIC generates TLS sequences that violate the spec on 344 # Solaris/sparcv9, causing executables created with the system linker 345 # to SEGV (GCC PR target/96607). 346 # clang with -O3 -fPIC generates code that SEGVs. 347 # Both can be worked around by compiling with -O instead. 348 if(${CMAKE_SYSTEM_NAME} STREQUAL "SunOS" AND LLVM_NATIVE_ARCH STREQUAL "Sparc") 349 llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELEASE "-O[23]" "-O") 350 llvm_replace_compiler_option(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O[23]" "-O") 351 endif() 352endif() 353 354if(NOT WIN32 AND NOT CYGWIN AND NOT (${CMAKE_SYSTEM_NAME} MATCHES "AIX")) 355 # MinGW warns if -fvisibility-inlines-hidden is used. 356 # GCC on AIX warns if -fvisibility-inlines-hidden is used and Clang on AIX doesn't currently support visibility. 357 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 358 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) 359endif() 360 361if(CMAKE_SIZEOF_VOID_P EQUAL 8 AND MINGW) 362 add_definitions( -D_FILE_OFFSET_BITS=64 ) 363endif() 364 365if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 366 # TODO: support other platforms and toolchains. 367 if( LLVM_BUILD_32_BITS ) 368 message(STATUS "Building 32 bits executables and libraries.") 369 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32") 370 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32") 371 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32") 372 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32") 373 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32") 374 375 # FIXME: CMAKE_SIZEOF_VOID_P is still 8 376 add_definitions(-D_LARGEFILE_SOURCE) 377 add_definitions(-D_FILE_OFFSET_BITS=64) 378 endif( LLVM_BUILD_32_BITS ) 379endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 380 381# If building on a GNU specific 32-bit system, make sure off_t is 64 bits 382# so that off_t can stored offset > 2GB. 383# Android until version N (API 24) doesn't support it. 384if (ANDROID AND (ANDROID_NATIVE_API_LEVEL LESS 24)) 385 set(LLVM_FORCE_SMALLFILE_FOR_ANDROID TRUE) 386endif() 387if( CMAKE_SIZEOF_VOID_P EQUAL 4 AND NOT LLVM_FORCE_SMALLFILE_FOR_ANDROID) 388 # FIXME: It isn't handled in LLVM_BUILD_32_BITS. 389 add_definitions( -D_LARGEFILE_SOURCE ) 390 add_definitions( -D_FILE_OFFSET_BITS=64 ) 391endif() 392 393if( XCODE ) 394 # For Xcode enable several build settings that correspond to 395 # many warnings that are on by default in Clang but are 396 # not enabled for historical reasons. For versions of Xcode 397 # that do not support these options they will simply 398 # be ignored. 399 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES") 400 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES") 401 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES") 402 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES") 403 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES") 404 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES") 405 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES") 406 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES") 407 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES") 408 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES") 409 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES") 410 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES") 411 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES") 412 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES") 413 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES") 414endif() 415 416# On Win32 using MS tools, provide an option to set the number of parallel jobs 417# to use. 418if( MSVC_IDE ) 419 set(LLVM_COMPILER_JOBS "0" CACHE STRING 420 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 421 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 422 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 423 add_definitions( /MP ) 424 else() 425 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 426 add_definitions( /MP${LLVM_COMPILER_JOBS} ) 427 endif() 428 else() 429 message(STATUS "Parallel compilation disabled") 430 endif() 431endif() 432 433# set stack reserved size to ~10MB 434if(MSVC) 435 # CMake previously automatically set this value for MSVC builds, but the 436 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default 437 # value (1 MB) which is not enough for us in tasks such as parsing recursive 438 # C++ templates in Clang. 439 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000") 440elseif(MINGW) # FIXME: Also cygwin? 441 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216") 442 443 # Pass -mbig-obj to mingw gas to avoid COFF 2**16 section limit. 444 if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang") 445 append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 446 endif() 447endif() 448 449option(LLVM_ENABLE_WARNINGS "Enable compiler warnings." ON) 450 451if( MSVC ) 452 include(ChooseMSVCCRT) 453 454 # Add definitions that make MSVC much less annoying. 455 add_definitions( 456 # For some reason MS wants to deprecate a bunch of standard functions... 457 -D_CRT_SECURE_NO_DEPRECATE 458 -D_CRT_SECURE_NO_WARNINGS 459 -D_CRT_NONSTDC_NO_DEPRECATE 460 -D_CRT_NONSTDC_NO_WARNINGS 461 -D_SCL_SECURE_NO_DEPRECATE 462 -D_SCL_SECURE_NO_WARNINGS 463 ) 464 465 # Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI. 466 add_definitions( 467 -DUNICODE 468 -D_UNICODE 469 ) 470 471 if (LLVM_WINSYSROOT) 472 if (NOT CLANG_CL) 473 message(ERROR "LLVM_WINSYSROOT requires clang-cl") 474 endif() 475 append("/winsysroot${LLVM_WINSYSROOT}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 476 endif() 477 478 if (LLVM_ENABLE_WERROR) 479 append("/WX" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 480 endif (LLVM_ENABLE_WERROR) 481 482 append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 483 484 # Some projects use the __cplusplus preprocessor macro to check support for 485 # a particular version of the C++ standard. When this option is not specified 486 # explicitly, macro's value is "199711L" that implies C++98 Standard. 487 # https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/ 488 append("/Zc:__cplusplus" CMAKE_CXX_FLAGS) 489 490 # Allow users to request PDBs in release mode. CMake offeres the 491 # RelWithDebInfo configuration, but it uses different optimization settings 492 # (/Ob1 vs /Ob2 or -O2 vs -O3). LLVM provides this flag so that users can get 493 # PDBs without changing codegen. 494 option(LLVM_ENABLE_PDB OFF) 495 if (LLVM_ENABLE_PDB AND uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE") 496 append("/Zi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 497 # /DEBUG disables linker GC and ICF, but we want those in Release mode. 498 append("/DEBUG /OPT:REF /OPT:ICF" 499 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS 500 CMAKE_SHARED_LINKER_FLAGS) 501 endif() 502 503 # Get all linker flags in upper case form so we can search them. 504 string(CONCAT all_linker_flags_uppercase 505 ${CMAKE_EXE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " " 506 ${CMAKE_EXE_LINKER_FLAGS} " " 507 ${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " " 508 ${CMAKE_MODULE_LINKER_FLAGS} " " 509 ${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} " " 510 ${CMAKE_SHARED_LINKER_FLAGS}) 511 string(TOUPPER "${all_linker_flags_uppercase}" all_linker_flags_uppercase) 512 513 if (CLANG_CL AND LINKER_IS_LLD) 514 # If we are using clang-cl with lld-link and /debug is present in any of the 515 # linker flag variables, pass -gcodeview-ghash to the compiler to speed up 516 # linking. This flag is orthogonal from /Zi, /Z7, and other flags that 517 # enable debug info emission, and only has an effect if those are also in 518 # use. 519 string(FIND "${all_linker_flags_uppercase}" "/DEBUG" linker_flag_idx) 520 if (${linker_flag_idx} GREATER -1) 521 add_flag_if_supported("-gcodeview-ghash" GCODEVIEW_GHASH) 522 endif() 523 endif() 524 525 # Disable string literal const->non-const type conversion. 526 # "When specified, the compiler requires strict const-qualification 527 # conformance for pointers initialized by using string literals." 528 append("/Zc:strictStrings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 529 530 # "Generate Intrinsic Functions". 531 append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 532 533 # "Enforce type conversion rules". 534 append("/Zc:rvalueCast" CMAKE_CXX_FLAGS) 535 536 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO) 537 # clang-cl and cl by default produce non-deterministic binaries because 538 # link.exe /incremental requires a timestamp in the .obj file. clang-cl 539 # has the flag /Brepro to force deterministic binaries. We want to pass that 540 # whenever you're building with clang unless you're passing /incremental 541 # or using LTO (/Brepro with LTO would result in a warning about the flag 542 # being unused, because we're not generating object files). 543 # This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag() 544 # because cl.exe does not emit an error on flags it doesn't understand, 545 # letting check_cxx_compiler_flag() claim it understands all flags. 546 check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO) 547 if (SUPPORTS_BREPRO) 548 # Check if /INCREMENTAL is passed to the linker and complain that it 549 # won't work with /Brepro. 550 has_msvc_incremental_no_flag("${CMAKE_EXE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_EXE_LINKER_FLAGS}" NO_INCR_EXE) 551 has_msvc_incremental_no_flag("${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_MODULE_LINKER_FLAGS}" NO_INCR_MODULE) 552 has_msvc_incremental_no_flag("${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_SHARED_LINKER_FLAGS}" NO_INCR_SHARED) 553 if (NO_INCR_EXE AND NO_INCR_MODULE AND NO_INCR_SHARED) 554 append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 555 else() 556 message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic") 557 endif() 558 endif() 559 endif() 560 # By default MSVC has a 2^16 limit on the number of sections in an object file, 561 # but in many objects files need more than that. This flag is to increase the 562 # number of sections. 563 append("/bigobj" CMAKE_CXX_FLAGS) 564endif( MSVC ) 565 566# Warnings-as-errors handling for GCC-compatible compilers: 567if ( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 568 append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 569 append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS) 570endif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 571 572# Specific default warnings-as-errors for compilers accepting GCC-compatible warning flags: 573if ( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" ) 574 add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME) 575 add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW) 576endif( LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL" ) 577 578# Modules enablement for GCC-compatible compilers: 579if ( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES ) 580 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 581 set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache") 582 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin") 583 # On Darwin -fmodules does not imply -fcxx-modules. 584 set(module_flags "${module_flags} -fcxx-modules") 585 endif() 586 if (LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY) 587 set(module_flags "${module_flags} -Xclang -fmodules-local-submodule-visibility") 588 endif() 589 if (LLVM_ENABLE_MODULE_DEBUGGING AND 590 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR 591 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO"))) 592 set(module_flags "${module_flags} -gmodules") 593 endif() 594 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${module_flags}") 595 596 # Check that we can build code with modules enabled, and that repeatedly 597 # including <cassert> still manages to respect NDEBUG properly. 598 CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG 599 #include <cassert> 600 #define NDEBUG 601 #include <cassert> 602 int main() { assert(this code is not compiled); }" 603 CXX_SUPPORTS_MODULES) 604 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 605 if (CXX_SUPPORTS_MODULES) 606 append("${module_flags}" CMAKE_CXX_FLAGS) 607 else() 608 message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler") 609 endif() 610endif( LLVM_COMPILER_IS_GCC_COMPATIBLE AND LLVM_ENABLE_MODULES ) 611 612if (MSVC) 613 if (NOT CLANG_CL) 614 set(msvc_warning_flags 615 # Disabled warnings. 616 -wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline) 617 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 618 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 619 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 620 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' 621 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 622 -wd4456 # Suppress 'declaration of 'var' hides local variable' 623 -wd4457 # Suppress 'declaration of 'var' hides function parameter' 624 -wd4458 # Suppress 'declaration of 'var' hides class member' 625 -wd4459 # Suppress 'declaration of 'var' hides global declaration' 626 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 627 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 628 -wd4722 # Suppress 'function' : destructor never returns, potential memory leak 629 -wd4100 # Suppress 'unreferenced formal parameter' 630 -wd4127 # Suppress 'conditional expression is constant' 631 -wd4512 # Suppress 'assignment operator could not be generated' 632 -wd4505 # Suppress 'unreferenced local function has been removed' 633 -wd4610 # Suppress '<class> can never be instantiated' 634 -wd4510 # Suppress 'default constructor could not be generated' 635 -wd4702 # Suppress 'unreachable code' 636 -wd4245 # Suppress ''conversion' : conversion from 'type1' to 'type2', signed/unsigned mismatch' 637 -wd4706 # Suppress 'assignment within conditional expression' 638 -wd4310 # Suppress 'cast truncates constant value' 639 -wd4701 # Suppress 'potentially uninitialized local variable' 640 -wd4703 # Suppress 'potentially uninitialized local pointer variable' 641 -wd4389 # Suppress 'signed/unsigned mismatch' 642 -wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable' 643 -wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation' 644 -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer' 645 -wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed' 646 -wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared' 647 # C4592 is disabled because of false positives in Visual Studio 2015 648 # Update 1. Re-evaluate the usefulness of this diagnostic with Update 2. 649 -wd4592 # Suppress ''var': symbol will be dynamically initialized (implementation limitation) 650 -wd4319 # Suppress ''operator' : zero extending 'type' to 'type' of greater size' 651 # C4709 is disabled because of a bug with Visual Studio 2017 as of 652 # v15.8.8. Re-evaluate the usefulness of this diagnostic when the bug 653 # is fixed. 654 -wd4709 # Suppress comma operator within array index expression 655 656 # Ideally, we'd like this warning to be enabled, but even MSVC 2019 doesn't 657 # support the 'aligned' attribute in the way that clang sources requires (for 658 # any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to 659 # avoid unwanted alignment warnings. 660 -wd4324 # Suppress 'structure was padded due to __declspec(align())' 661 662 # Promoted warnings. 663 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 664 665 # Promoted warnings to errors. 666 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 667 ) 668 endif(NOT CLANG_CL) 669 670 # Enable warnings 671 if (LLVM_ENABLE_WARNINGS) 672 # Put /W4 in front of all the -we flags. cl.exe doesn't care, but for 673 # clang-cl having /W4 after the -we flags will re-enable the warnings 674 # disabled by -we. 675 set(msvc_warning_flags "/W4 ${msvc_warning_flags}") 676 # CMake appends /W3 by default, and having /W3 followed by /W4 will result in 677 # cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is 678 # a command line warning and not a compiler warning, it cannot be suppressed except 679 # by fixing the command line. 680 string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") 681 string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 682 683 if (LLVM_ENABLE_PEDANTIC) 684 # No MSVC equivalent available 685 endif (LLVM_ENABLE_PEDANTIC) 686 endif (LLVM_ENABLE_WARNINGS) 687 688 foreach(flag ${msvc_warning_flags}) 689 append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 690 endforeach(flag) 691endif (MSVC) 692 693if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 694 695 # Don't add -Wall for clang-cl, because it maps -Wall to -Weverything for 696 # MSVC compatibility. /W4 is added above instead. 697 if (NOT CLANG_CL) 698 append("-Wall" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 699 endif() 700 701 append("-Wextra -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 702 append("-Wcast-qual" CMAKE_CXX_FLAGS) 703 704 # Turn off missing field initializer warnings for gcc to avoid noise from 705 # false positives with empty {}. Turn them on otherwise (they're off by 706 # default for clang). 707 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 708 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 709 if (CMAKE_COMPILER_IS_GNUCXX) 710 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 711 else() 712 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 713 endif() 714 endif() 715 716 if (LLVM_ENABLE_PEDANTIC AND LLVM_COMPILER_IS_GCC_COMPATIBLE) 717 append("-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 718 append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 719 720 # GCC warns about redundant toplevel semicolons (enabled by -pedantic 721 # above), while Clang doesn't. Enable the corresponding Clang option to 722 # pick up on these even in builds with Clang. 723 add_flag_if_supported("-Wc++98-compat-extra-semi" CXX98_COMPAT_EXTRA_SEMI_FLAG) 724 endif() 725 726 add_flag_if_supported("-Wimplicit-fallthrough" IMPLICIT_FALLTHROUGH_FLAG) 727 add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG) 728 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS) 729 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS) 730 731 # Disable -Wclass-memaccess, a C++-only warning from GCC 8 that fires on 732 # LLVM's ADT classes. 733 check_cxx_compiler_flag("-Wclass-memaccess" CXX_SUPPORTS_CLASS_MEMACCESS_FLAG) 734 append_if(CXX_SUPPORTS_CLASS_MEMACCESS_FLAG "-Wno-class-memaccess" CMAKE_CXX_FLAGS) 735 736 # Disable -Wredundant-move and -Wpessimizing-move on GCC>=9. GCC wants to 737 # remove std::move in code like "A foo(ConvertibleToA a) { 738 # return std::move(a); }", but this code does not compile (or uses the copy 739 # constructor instead) on clang<=3.8. Clang also has a -Wredundant-move and 740 # -Wpessimizing-move, but they only fire when the types match exactly, so we 741 # can keep them here. 742 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU") 743 check_cxx_compiler_flag("-Wredundant-move" CXX_SUPPORTS_REDUNDANT_MOVE_FLAG) 744 append_if(CXX_SUPPORTS_REDUNDANT_MOVE_FLAG "-Wno-redundant-move" CMAKE_CXX_FLAGS) 745 check_cxx_compiler_flag("-Wpessimizing-move" CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG) 746 append_if(CXX_SUPPORTS_PESSIMIZING_MOVE_FLAG "-Wno-pessimizing-move" CMAKE_CXX_FLAGS) 747 endif() 748 749 # The LLVM libraries have no stable C++ API, so -Wnoexcept-type is not useful. 750 check_cxx_compiler_flag("-Wnoexcept-type" CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG) 751 append_if(CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG "-Wno-noexcept-type" CMAKE_CXX_FLAGS) 752 753 # Check if -Wnon-virtual-dtor warns for a class marked final, when it has a 754 # friend declaration. If it does, don't add -Wnon-virtual-dtor. The case is 755 # considered unhelpful (https://gcc.gnu.org/PR102168). 756 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 757 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=non-virtual-dtor") 758 CHECK_CXX_SOURCE_COMPILES("class f {}; 759 class base {friend f; public: virtual void anchor();protected: ~base();}; 760 int main() { return 0; }" 761 CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR) 762 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 763 append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS) 764 765 append("-Wdelete-non-virtual-dtor" CMAKE_CXX_FLAGS) 766 767 # Enable -Wsuggest-override if it's available, and only if it doesn't 768 # suggest adding 'override' to functions that are already marked 'final' 769 # (which means it is disabled for GCC < 9.2). 770 check_cxx_compiler_flag("-Wsuggest-override" CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG) 771 if (CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG) 772 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 773 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=suggest-override") 774 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();}; 775 class derived : base {public: void anchor() final;}; 776 int main() { return 0; }" 777 CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL) 778 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 779 append_if(CXX_WSUGGEST_OVERRIDE_ALLOWS_ONLY_FINAL "-Wsuggest-override" CMAKE_CXX_FLAGS) 780 endif() 781 782 # Check if -Wcomment is OK with an // comment ending with '\' if the next 783 # line is also a // comment. 784 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 785 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment") 786 CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main() {return 0;}" 787 C_WCOMMENT_ALLOWS_LINE_WRAP) 788 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 789 if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP) 790 append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 791 endif() 792 793 # Enable -Wstring-conversion to catch misuse of string literals. 794 add_flag_if_supported("-Wstring-conversion" STRING_CONVERSION_FLAG) 795 796 # Prevent bugs that can happen with llvm's brace style. 797 add_flag_if_supported("-Wmisleading-indentation" MISLEADING_INDENTATION_FLAG) 798endif (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 799 800if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT LLVM_ENABLE_WARNINGS) 801 append("-w" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 802endif() 803 804macro(append_common_sanitizer_flags) 805 if (NOT MSVC) 806 # Append -fno-omit-frame-pointer and turn on debug info to get better 807 # stack traces. 808 add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER) 809 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 810 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 811 add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY) 812 endif() 813 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large. 814 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND LLVM_OPTIMIZE_SANITIZED_BUILDS) 815 add_flag_if_supported("-O1" O1) 816 endif() 817 elseif (CLANG_CL) 818 # Keep frame pointers around. 819 append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 820 # Always ask the linker to produce symbols with asan. 821 append("/Z7" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 822 append("-debug" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 823 endif() 824endmacro() 825 826# Turn on sanitizers if necessary. 827if(LLVM_USE_SANITIZER) 828 if (LLVM_ON_UNIX) 829 if (LLVM_USE_SANITIZER STREQUAL "Address") 830 append_common_sanitizer_flags() 831 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 832 elseif (LLVM_USE_SANITIZER STREQUAL "HWAddress") 833 append_common_sanitizer_flags() 834 append("-fsanitize=hwaddress" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 835 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 836 append_common_sanitizer_flags() 837 append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 838 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 839 append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 840 endif() 841 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 842 append_common_sanitizer_flags() 843 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 844 elseif (LLVM_USE_SANITIZER STREQUAL "Thread") 845 append_common_sanitizer_flags() 846 append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 847 elseif (LLVM_USE_SANITIZER STREQUAL "DataFlow") 848 append("-fsanitize=dataflow" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 849 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 850 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 851 append_common_sanitizer_flags() 852 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 853 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 854 elseif (LLVM_USE_SANITIZER STREQUAL "Leaks") 855 append_common_sanitizer_flags() 856 append("-fsanitize=leak" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 857 else() 858 message(FATAL_ERROR "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 859 endif() 860 elseif(MINGW) 861 if (LLVM_USE_SANITIZER STREQUAL "Address") 862 append_common_sanitizer_flags() 863 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 864 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 865 append_common_sanitizer_flags() 866 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 867 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 868 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 869 append_common_sanitizer_flags() 870 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 871 append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 872 else() 873 message(FATAL_ERROR "This sanitizer not yet supported in a MinGW environment: ${LLVM_USE_SANITIZER}") 874 endif() 875 elseif(MSVC) 876 if (LLVM_USE_SANITIZER STREQUAL "Address") 877 append_common_sanitizer_flags() 878 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 879 else() 880 message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}") 881 endif() 882 else() 883 message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.") 884 endif() 885 if (LLVM_USE_SANITIZER MATCHES "(Undefined;)?Address(;Undefined)?") 886 add_flag_if_supported("-fsanitize-address-use-after-scope" 887 FSANITIZE_USE_AFTER_SCOPE_FLAG) 888 endif() 889 if (LLVM_USE_SANITIZE_COVERAGE) 890 append("-fsanitize=fuzzer-no-link" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 891 endif() 892 if (LLVM_USE_SANITIZER MATCHES ".*Undefined.*") 893 set(IGNORELIST_FILE "${CMAKE_SOURCE_DIR}/utils/sanitizers/ubsan_ignorelist.txt") 894 if (EXISTS "${IGNORELIST_FILE}") 895 # Use this option name version since -fsanitize-ignorelist is only 896 # accepted with clang 13.0 or newer. 897 append("-fsanitize-blacklist=${IGNORELIST_FILE}" 898 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 899 endif() 900 endif() 901endif() 902 903# Turn on -gsplit-dwarf if requested in debug builds. 904if (LLVM_USE_SPLIT_DWARF AND 905 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR 906 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO"))) 907 # Limit to clang and gcc so far. Add compilers supporting this option. 908 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR 909 CMAKE_CXX_COMPILER_ID STREQUAL "GNU") 910 add_compile_options(-gsplit-dwarf) 911 include(LLVMCheckLinkerFlag) 912 llvm_check_linker_flag(CXX "-Wl,--gdb-index" LINKER_SUPPORTS_GDB_INDEX) 913 append_if(LINKER_SUPPORTS_GDB_INDEX "-Wl,--gdb-index" 914 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 915 endif() 916endif() 917 918add_definitions( -D__STDC_CONSTANT_MACROS ) 919add_definitions( -D__STDC_FORMAT_MACROS ) 920add_definitions( -D__STDC_LIMIT_MACROS ) 921 922# clang and gcc don't default-print colored diagnostics when invoked from Ninja. 923if (UNIX AND 924 CMAKE_GENERATOR MATCHES "Ninja" AND 925 (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR 926 (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND 927 NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)))) 928 append("-fdiagnostics-color" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 929endif() 930 931# lld doesn't print colored diagnostics when invoked from Ninja 932if (UNIX AND CMAKE_GENERATOR MATCHES "Ninja") 933 include(LLVMCheckLinkerFlag) 934 llvm_check_linker_flag(CXX "-Wl,--color-diagnostics" LINKER_SUPPORTS_COLOR_DIAGNOSTICS) 935 append_if(LINKER_SUPPORTS_COLOR_DIAGNOSTICS "-Wl,--color-diagnostics" 936 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 937endif() 938 939# Add flags for add_dead_strip(). 940# FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF? 941# But MinSizeRel seems to add that automatically, so maybe disable these 942# flags instead if LLVM_NO_DEAD_STRIP is set. 943if(NOT CYGWIN AND NOT MSVC) 944 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND 945 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 946 check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS) 947 if (C_SUPPORTS_FNO_FUNCTION_SECTIONS) 948 # Don't add -ffunction-sections if it can't be disabled with -fno-function-sections. 949 # Doing so will break sanitizers. 950 add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS) 951 elseif (CMAKE_CXX_COMPILER_ID MATCHES "XL") 952 append("-qfuncsect" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 953 endif() 954 add_flag_if_supported("-fdata-sections" FDATA_SECTIONS) 955 endif() 956elseif(MSVC) 957 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 958 append("/Gw" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 959 endif() 960endif() 961 962if(MSVC) 963 # Remove flags here, for exceptions and RTTI. 964 # Each target property or source property should be responsible to control 965 # them. 966 # CL.EXE complains to override flags like "/GR /GR-". 967 string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 968 string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 969endif() 970 971# Provide public options to globally control RTTI and EH 972option(LLVM_ENABLE_EH "Enable Exception handling" OFF) 973option(LLVM_ENABLE_RTTI "Enable run time type information" OFF) 974if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI) 975 message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON") 976endif() 977 978option(LLVM_ENABLE_IR_PGO "Build LLVM and tools with IR PGO instrumentation (deprecated)" Off) 979mark_as_advanced(LLVM_ENABLE_IR_PGO) 980 981set(LLVM_BUILD_INSTRUMENTED OFF CACHE STRING "Build LLVM and tools with PGO instrumentation. May be specified as IR or Frontend") 982set(LLVM_VP_COUNTERS_PER_SITE "1.5" CACHE STRING "Value profile counters to use per site for IR PGO with Clang") 983mark_as_advanced(LLVM_BUILD_INSTRUMENTED LLVM_VP_COUNTERS_PER_SITE) 984string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED) 985 986if (LLVM_BUILD_INSTRUMENTED) 987 if (LLVM_ENABLE_IR_PGO OR uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "IR") 988 append("-fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\"" 989 CMAKE_CXX_FLAGS 990 CMAKE_C_FLAGS) 991 if(NOT LINKER_IS_LLD_LINK) 992 append("-fprofile-generate=\"${LLVM_PROFILE_DATA_DIR}\"" 993 CMAKE_EXE_LINKER_FLAGS 994 CMAKE_SHARED_LINKER_FLAGS) 995 endif() 996 # Set this to avoid running out of the value profile node section 997 # under clang in dynamic linking mode. 998 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND 999 CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 11 AND 1000 LLVM_LINK_LLVM_DYLIB) 1001 append("-Xclang -mllvm -Xclang -vp-counters-per-site=${LLVM_VP_COUNTERS_PER_SITE}" 1002 CMAKE_CXX_FLAGS 1003 CMAKE_C_FLAGS) 1004 endif() 1005 elseif(uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "CSIR") 1006 append("-fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\"" 1007 CMAKE_CXX_FLAGS 1008 CMAKE_C_FLAGS) 1009 if(NOT LINKER_IS_LLD_LINK) 1010 append("-fcs-profile-generate=\"${LLVM_CSPROFILE_DATA_DIR}\"" 1011 CMAKE_EXE_LINKER_FLAGS 1012 CMAKE_SHARED_LINKER_FLAGS) 1013 endif() 1014 else() 1015 append("-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\"" 1016 CMAKE_CXX_FLAGS 1017 CMAKE_C_FLAGS) 1018 if(NOT LINKER_IS_LLD_LINK) 1019 append("-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\"" 1020 CMAKE_EXE_LINKER_FLAGS 1021 CMAKE_SHARED_LINKER_FLAGS) 1022 endif() 1023 endif() 1024endif() 1025 1026# When using clang-cl with an instrumentation-based tool, add clang's library 1027# resource directory to the library search path. Because cmake invokes the 1028# linker directly, it isn't sufficient to pass -fsanitize=* to the linker. 1029if (CLANG_CL AND (LLVM_BUILD_INSTRUMENTED OR LLVM_USE_SANITIZER)) 1030 execute_process( 1031 COMMAND ${CMAKE_CXX_COMPILER} /clang:-print-libgcc-file-name /clang:--rtlib=compiler-rt 1032 OUTPUT_VARIABLE clang_compiler_rt_file 1033 ERROR_VARIABLE clang_cl_stderr 1034 OUTPUT_STRIP_TRAILING_WHITESPACE 1035 ERROR_STRIP_TRAILING_WHITESPACE 1036 RESULT_VARIABLE clang_cl_exit_code) 1037 if (NOT "${clang_cl_exit_code}" STREQUAL "0") 1038 message(FATAL_ERROR 1039 "Unable to invoke clang-cl to find resource dir: ${clang_cl_stderr}") 1040 endif() 1041 file(TO_CMAKE_PATH "${clang_compiler_rt_file}" clang_compiler_rt_file) 1042 get_filename_component(clang_runtime_dir "${clang_compiler_rt_file}" DIRECTORY) 1043 append("/libpath:${clang_runtime_dir}" 1044 CMAKE_EXE_LINKER_FLAGS 1045 CMAKE_MODULE_LINKER_FLAGS 1046 CMAKE_SHARED_LINKER_FLAGS) 1047endif() 1048 1049if(LLVM_PROFDATA_FILE AND EXISTS ${LLVM_PROFDATA_FILE}) 1050 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" ) 1051 append("-fprofile-instr-use=\"${LLVM_PROFDATA_FILE}\"" 1052 CMAKE_CXX_FLAGS 1053 CMAKE_C_FLAGS) 1054 if(NOT LINKER_IS_LLD_LINK) 1055 append("-fprofile-instr-use=\"${LLVM_PROFDATA_FILE}\"" 1056 CMAKE_EXE_LINKER_FLAGS 1057 CMAKE_SHARED_LINKER_FLAGS) 1058 endif() 1059 else() 1060 message(FATAL_ERROR "LLVM_PROFDATA_FILE can only be specified when compiling with clang") 1061 endif() 1062endif() 1063 1064option(LLVM_BUILD_INSTRUMENTED_COVERAGE "Build LLVM and tools with Code Coverage instrumentation" Off) 1065mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE) 1066append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate=\"${LLVM_PROFILE_FILE_PATTERN}\" -fcoverage-mapping" 1067 CMAKE_CXX_FLAGS 1068 CMAKE_C_FLAGS 1069 CMAKE_EXE_LINKER_FLAGS 1070 CMAKE_SHARED_LINKER_FLAGS) 1071 1072if (LLVM_BUILD_INSTRUMENTED AND LLVM_BUILD_INSTRUMENTED_COVERAGE) 1073 message(FATAL_ERROR "LLVM_BUILD_INSTRUMENTED and LLVM_BUILD_INSTRUMENTED_COVERAGE cannot both be specified") 1074endif() 1075 1076set(LLVM_THINLTO_CACHE_PATH "${PROJECT_BINARY_DIR}/lto.cache" CACHE STRING "Set ThinLTO cache path. This can be used when building LLVM from several different directiories.") 1077 1078if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK AND NOT MINGW) 1079 message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)") 1080endif() 1081if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 1082 append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 1083 if(NOT LINKER_IS_LLD_LINK) 1084 append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1085 endif() 1086 # If the linker supports it, enable the lto cache. This improves initial build 1087 # time a little since we re-link a lot of the same objects, and significantly 1088 # improves incremental build time. 1089 # FIXME: We should move all this logic into the clang driver. 1090 if(APPLE) 1091 append("-Wl,-cache_path_lto,${LLVM_THINLTO_CACHE_PATH}" 1092 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1093 elseif((UNIX OR MINGW) AND LLVM_USE_LINKER STREQUAL "lld") 1094 append("-Wl,--thinlto-cache-dir=${LLVM_THINLTO_CACHE_PATH}" 1095 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1096 elseif(LLVM_USE_LINKER STREQUAL "gold") 1097 append("-Wl,--plugin-opt,cache-dir=${LLVM_THINLTO_CACHE_PATH}" 1098 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1099 elseif(LINKER_IS_LLD_LINK) 1100 append("/lldltocache:${LLVM_THINLTO_CACHE_PATH}" 1101 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1102 endif() 1103elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL") 1104 append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 1105 if(NOT LINKER_IS_LLD_LINK) 1106 append("-flto=full" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1107 endif() 1108elseif(LLVM_ENABLE_LTO) 1109 append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 1110 if(NOT LINKER_IS_LLD_LINK) 1111 append("-flto" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 1112 endif() 1113endif() 1114 1115# Set an AIX default for LLVM_EXPORT_SYMBOLS_FOR_PLUGINS based on whether we are 1116# doing dynamic linking (see below). 1117set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default OFF) 1118if (NOT (BUILD_SHARED_LIBS OR LLVM_LINK_LLVM_DYLIB)) 1119 set(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default ON) 1120endif() 1121 1122# This option makes utils/extract_symbols.py be used to determine the list of 1123# symbols to export from LLVM tools. This is necessary when on AIX or when using 1124# MSVC if you want to allow plugins. On AIX we don't show this option, and we 1125# enable it by default except when the LLVM libraries are set up for dynamic 1126# linking (due to incompatibility). With MSVC, note that the plugin has to 1127# explicitly link against (exactly one) tool so we can't unilaterally turn on 1128# LLVM_ENABLE_PLUGINS when it's enabled. 1129CMAKE_DEPENDENT_OPTION(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS 1130 "Export symbols from LLVM tools so that plugins can import them" OFF 1131 "NOT ${CMAKE_SYSTEM_NAME} MATCHES AIX" ${LLVM_EXPORT_SYMBOLS_FOR_PLUGINS_AIX_default}) 1132if(BUILD_SHARED_LIBS AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 1133 message(FATAL_ERROR "BUILD_SHARED_LIBS not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 1134endif() 1135if(LLVM_LINK_LLVM_DYLIB AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 1136 message(FATAL_ERROR "LLVM_LINK_LLVM_DYLIB not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 1137endif() 1138 1139# By default we should enable LLVM_ENABLE_IDE only for multi-configuration 1140# generators. This option disables optional build system features that make IDEs 1141# less usable. 1142set(LLVM_ENABLE_IDE_default OFF) 1143if (CMAKE_CONFIGURATION_TYPES) 1144 set(LLVM_ENABLE_IDE_default ON) 1145endif() 1146option(LLVM_ENABLE_IDE 1147 "Disable optional build system features that cause problems for IDE generators" 1148 ${LLVM_ENABLE_IDE_default}) 1149if (CMAKE_CONFIGURATION_TYPES AND NOT LLVM_ENABLE_IDE) 1150 message(WARNING "Disabling LLVM_ENABLE_IDE on multi-configuration generators is not recommended.") 1151endif() 1152 1153function(get_compile_definitions) 1154 get_directory_property(top_dir_definitions DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS) 1155 foreach(definition ${top_dir_definitions}) 1156 if(DEFINED result) 1157 string(APPEND result " -D${definition}") 1158 else() 1159 set(result "-D${definition}") 1160 endif() 1161 endforeach() 1162 set(LLVM_DEFINITIONS "${result}" PARENT_SCOPE) 1163endfunction() 1164get_compile_definitions() 1165 1166option(LLVM_FORCE_ENABLE_STATS "Enable statistics collection for builds that wouldn't normally enable it" OFF) 1167 1168check_symbol_exists(os_signpost_interval_begin "os/signpost.h" macos_signposts_available) 1169if(macos_signposts_available) 1170 check_cxx_source_compiles( 1171 "#include <os/signpost.h> 1172 int main() { os_signpost_interval_begin(nullptr, 0, \"\", \"\"); return 0; }" 1173 macos_signposts_usable) 1174 if(macos_signposts_usable) 1175 set(LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS "WITH_ASSERTS" CACHE STRING 1176 "Enable support for Xcode signposts. Can be WITH_ASSERTS, FORCE_ON, FORCE_OFF") 1177 string(TOUPPER "${LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS}" 1178 uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS) 1179 if( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "WITH_ASSERTS" ) 1180 if( LLVM_ENABLE_ASSERTIONS ) 1181 set( LLVM_SUPPORT_XCODE_SIGNPOSTS 1 ) 1182 endif() 1183 elseif( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "FORCE_ON" ) 1184 set( LLVM_SUPPORT_XCODE_SIGNPOSTS 1 ) 1185 elseif( uppercase_LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS STREQUAL "FORCE_OFF" ) 1186 # We don't need to do anything special to turn off signposts. 1187 elseif( NOT DEFINED LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS ) 1188 # Treat LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS like "FORCE_OFF" when it has not been 1189 # defined. 1190 else() 1191 message(FATAL_ERROR "Unknown value for LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS:" 1192 " \"${LLVM_ENABLE_SUPPORT_XCODE_SIGNPOSTS}\"!") 1193 endif() 1194 endif() 1195endif() 1196 1197set(LLVM_SOURCE_PREFIX "" CACHE STRING "Use prefix for sources") 1198 1199option(LLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO "Use relative paths in debug info" OFF) 1200 1201if(LLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO) 1202 check_c_compiler_flag("-fdebug-prefix-map=foo=bar" SUPPORTS_FDEBUG_PREFIX_MAP) 1203 if(LLVM_ENABLE_PROJECTS_USED) 1204 get_filename_component(source_root "${LLVM_MAIN_SRC_DIR}/.." ABSOLUTE) 1205 else() 1206 set(source_root "${LLVM_MAIN_SRC_DIR}") 1207 endif() 1208 file(RELATIVE_PATH relative_root "${source_root}" "${CMAKE_BINARY_DIR}") 1209 append_if(SUPPORTS_FDEBUG_PREFIX_MAP "-fdebug-prefix-map=${CMAKE_BINARY_DIR}=${relative_root}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1210 append_if(SUPPORTS_FDEBUG_PREFIX_MAP "-fdebug-prefix-map=${source_root}/=${LLVM_SOURCE_PREFIX}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1211 add_flag_if_supported("-no-canonical-prefixes" NO_CANONICAL_PREFIXES) 1212endif() 1213 1214option(LLVM_USE_RELATIVE_PATHS_IN_FILES "Use relative paths in sources and debug info" OFF) 1215 1216if(LLVM_USE_RELATIVE_PATHS_IN_FILES) 1217 check_c_compiler_flag("-ffile-prefix-map=foo=bar" SUPPORTS_FFILE_PREFIX_MAP) 1218 if(LLVM_ENABLE_PROJECTS_USED) 1219 get_filename_component(source_root "${LLVM_MAIN_SRC_DIR}/.." ABSOLUTE) 1220 else() 1221 set(source_root "${LLVM_MAIN_SRC_DIR}") 1222 endif() 1223 file(RELATIVE_PATH relative_root "${source_root}" "${CMAKE_BINARY_DIR}") 1224 append_if(SUPPORTS_FFILE_PREFIX_MAP "-ffile-prefix-map=${CMAKE_BINARY_DIR}=${relative_root}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1225 append_if(SUPPORTS_FFILE_PREFIX_MAP "-ffile-prefix-map=${source_root}/=${LLVM_SOURCE_PREFIX}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 1226 add_flag_if_supported("-no-canonical-prefixes" NO_CANONICAL_PREFIXES) 1227endif() 1228 1229if(LLVM_INCLUDE_TESTS) 1230 # Lit test suite requires at least python 3.6 1231 set(LLVM_MINIMUM_PYTHON_VERSION 3.6) 1232else() 1233 # FIXME: it is unknown if this is the actual minimum bound 1234 set(LLVM_MINIMUM_PYTHON_VERSION 3.0) 1235endif() 1236