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