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. 7 string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE) 8 9 include(CheckCompilerVersion) 10 include(HandleLLVMStdlib) 11 include(CheckCCompilerFlag) 12 include(CheckCXXCompilerFlag) 13 14 if(CMAKE_LINKER MATCHES "lld-link.exe" OR (WIN32 AND LLVM_USE_LINKER STREQUAL "lld")) 15 set(LINKER_IS_LLD_LINK TRUE) 16 else() 17 set(LINKER_IS_LLD_LINK FALSE) 18 endif() 19 20 set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO") 21 string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO) 22 23 # Ninja Job Pool support 24 # The following only works with the Ninja generator in CMake >= 3.0. 25 set(LLVM_PARALLEL_COMPILE_JOBS "" CACHE STRING 26 "Define the maximum number of concurrent compilation jobs.") 27 if(LLVM_PARALLEL_COMPILE_JOBS) 28 if(NOT CMAKE_MAKE_PROGRAM MATCHES "ninja") 29 message(WARNING "Job pooling is only available with Ninja generators.") 30 else() 31 set_property(GLOBAL APPEND PROPERTY JOB_POOLS compile_job_pool=${LLVM_PARALLEL_COMPILE_JOBS}) 32 set(CMAKE_JOB_POOL_COMPILE compile_job_pool) 33 endif() 34 endif() 35 36 set(LLVM_PARALLEL_LINK_JOBS "" CACHE STRING 37 "Define the maximum number of concurrent link jobs.") 38 if(CMAKE_MAKE_PROGRAM MATCHES "ninja") 39 if(NOT LLVM_PARALLEL_LINK_JOBS AND uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 40 message(STATUS "ThinLTO provides its own parallel linking - limiting parallel link jobs to 2.") 41 set(LLVM_PARALLEL_LINK_JOBS "2") 42 endif() 43 if(LLVM_PARALLEL_LINK_JOBS) 44 set_property(GLOBAL APPEND PROPERTY JOB_POOLS link_job_pool=${LLVM_PARALLEL_LINK_JOBS}) 45 set(CMAKE_JOB_POOL_LINK link_job_pool) 46 endif() 47 elseif(LLVM_PARALLEL_LINK_JOBS) 48 message(WARNING "Job pooling is only available with Ninja generators.") 49 endif() 50 51 if (LINKER_IS_LLD_LINK) 52 # Pass /MANIFEST:NO so that CMake doesn't run mt.exe on our binaries. Adding 53 # manifests with mt.exe breaks LLD's symbol tables and takes as much time as 54 # the link. See PR24476. 55 append("/MANIFEST:NO" 56 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 57 endif() 58 59 if( LLVM_ENABLE_ASSERTIONS ) 60 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 61 if( NOT MSVC ) 62 add_definitions( -D_DEBUG ) 63 endif() 64 # On non-Debug builds cmake automatically defines NDEBUG, so we 65 # explicitly undefine it: 66 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 67 add_definitions( -UNDEBUG ) 68 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines. 69 foreach (flags_var_to_scrub 70 CMAKE_CXX_FLAGS_RELEASE 71 CMAKE_CXX_FLAGS_RELWITHDEBINFO 72 CMAKE_CXX_FLAGS_MINSIZEREL 73 CMAKE_C_FLAGS_RELEASE 74 CMAKE_C_FLAGS_RELWITHDEBINFO 75 CMAKE_C_FLAGS_MINSIZEREL) 76 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " " 77 "${flags_var_to_scrub}" "${${flags_var_to_scrub}}") 78 endforeach() 79 endif() 80 endif() 81 82 if(LLVM_ENABLE_EXPENSIVE_CHECKS) 83 add_definitions(-DEXPENSIVE_CHECKS) 84 add_definitions(-D_GLIBCXX_DEBUG) 85 endif() 86 87 string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS) 88 89 if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" ) 90 if( LLVM_ENABLE_ASSERTIONS ) 91 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 92 endif() 93 elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" ) 94 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 95 elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" ) 96 # We don't need to do anything special to turn off ABI breaking checks. 97 elseif( NOT DEFINED LLVM_ABI_BREAKING_CHECKS ) 98 # Treat LLVM_ABI_BREAKING_CHECKS like "FORCE_OFF" when it has not been 99 # defined. 100 else() 101 message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!") 102 endif() 103 104 if( LLVM_REVERSE_ITERATION ) 105 set( LLVM_ENABLE_REVERSE_ITERATION 1 ) 106 endif() 107 108 if(WIN32) 109 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 110 if(CYGWIN) 111 set(LLVM_ON_WIN32 0) 112 set(LLVM_ON_UNIX 1) 113 else(CYGWIN) 114 set(LLVM_ON_WIN32 1) 115 set(LLVM_ON_UNIX 0) 116 endif(CYGWIN) 117 else(WIN32) 118 if(UNIX) 119 set(LLVM_ON_WIN32 0) 120 set(LLVM_ON_UNIX 1) 121 if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "AIX") 122 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 123 else() 124 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1) 125 endif() 126 else(UNIX) 127 MESSAGE(SEND_ERROR "Unable to determine platform") 128 endif(UNIX) 129 endif(WIN32) 130 131 set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX}) 132 set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 133 134 # We use *.dylib rather than *.so on darwin. 135 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 136 137 if(APPLE) 138 if(LLVM_ENABLE_LLD AND LLVM_ENABLE_LTO) 139 message(FATAL_ERROR "lld does not support LTO on Darwin") 140 endif() 141 # Darwin-specific linker flags for loadable modules. 142 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress") 143 endif() 144 145 # Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO 146 # build might work on ELF but fail on MachO/COFF. 147 if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32 OR CYGWIN OR 148 ${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD" OR 149 ${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD") AND 150 NOT LLVM_USE_SANITIZER) 151 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs") 152 endif() 153 154 155 function(append value) 156 foreach(variable ${ARGN}) 157 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 158 endforeach(variable) 159 endfunction() 160 161 function(append_if condition value) 162 if (${condition}) 163 foreach(variable ${ARGN}) 164 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 165 endforeach(variable) 166 endif() 167 endfunction() 168 169 macro(add_flag_if_supported flag name) 170 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 171 append_if("C_SUPPORTS_${name}" "${flag}" CMAKE_C_FLAGS) 172 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 173 append_if("CXX_SUPPORTS_${name}" "${flag}" CMAKE_CXX_FLAGS) 174 endmacro() 175 176 function(add_flag_or_print_warning flag name) 177 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 178 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 179 if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${name}) 180 message(STATUS "Building with ${flag}") 181 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE) 182 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE) 183 set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${flag}" PARENT_SCOPE) 184 else() 185 message(WARNING "${flag} is not supported.") 186 endif() 187 endfunction() 188 189 if( LLVM_ENABLE_LLD ) 190 if ( LLVM_USE_LINKER ) 191 message(FATAL_ERROR "LLVM_ENABLE_LLD and LLVM_USE_LINKER can't be set at the same time") 192 endif() 193 set(LLVM_USE_LINKER "lld") 194 endif() 195 196 if( LLVM_USE_LINKER ) 197 check_cxx_compiler_flag("-fuse-ld=${LLVM_USE_LINKER}" CXX_SUPPORTS_CUSTOM_LINKER) 198 if ( NOT CXX_SUPPORTS_CUSTOM_LINKER ) 199 message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'") 200 endif() 201 append("-fuse-ld=${LLVM_USE_LINKER}" 202 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 203 endif() 204 205 if( LLVM_ENABLE_PIC ) 206 if( XCODE ) 207 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't 208 # know how to disable this, so just force ENABLE_PIC off for now. 209 message(WARNING "-fPIC not supported with Xcode.") 210 elseif( WIN32 OR CYGWIN) 211 # On Windows all code is PIC. MinGW warns if -fPIC is used. 212 else() 213 add_flag_or_print_warning("-fPIC" FPIC) 214 endif() 215 endif() 216 217 if(NOT WIN32 AND NOT CYGWIN) 218 # MinGW warns if -fvisibility-inlines-hidden is used. 219 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 220 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) 221 endif() 222 223 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 224 # TODO: support other platforms and toolchains. 225 if( LLVM_BUILD_32_BITS ) 226 message(STATUS "Building 32 bits executables and libraries.") 227 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32") 228 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32") 229 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32") 230 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32") 231 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32") 232 endif( LLVM_BUILD_32_BITS ) 233 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 234 235 # If building on a GNU specific 32-bit system, make sure off_t is 64 bits 236 # so that off_t can stored offset > 2GB 237 if( CMAKE_SIZEOF_VOID_P EQUAL 4 ) 238 add_definitions( -D_LARGEFILE_SOURCE ) 239 add_definitions( -D_FILE_OFFSET_BITS=64 ) 240 endif() 241 242 if( XCODE ) 243 # For Xcode enable several build settings that correspond to 244 # many warnings that are on by default in Clang but are 245 # not enabled for historical reasons. For versions of Xcode 246 # that do not support these options they will simply 247 # be ignored. 248 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES") 249 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES") 250 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES") 251 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES") 252 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES") 253 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES") 254 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES") 255 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES") 256 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES") 257 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES") 258 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES") 259 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES") 260 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES") 261 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES") 262 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES") 263 endif() 264 265 # On Win32 using MS tools, provide an option to set the number of parallel jobs 266 # to use. 267 if( MSVC_IDE ) 268 set(LLVM_COMPILER_JOBS "0" CACHE STRING 269 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 270 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 271 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 272 add_definitions( /MP ) 273 else() 274 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 275 add_definitions( /MP${LLVM_COMPILER_JOBS} ) 276 endif() 277 else() 278 message(STATUS "Parallel compilation disabled") 279 endif() 280 endif() 281 282 # set stack reserved size to ~10MB 283 if(MSVC) 284 # CMake previously automatically set this value for MSVC builds, but the 285 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default 286 # value (1 MB) which is not enough for us in tasks such as parsing recursive 287 # C++ templates in Clang. 288 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000") 289 elseif(MINGW) # FIXME: Also cygwin? 290 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216") 291 292 # Pass -mbig-obj to mingw gas on Win64. COFF has a 2**16 section limit, and 293 # on Win64, every COMDAT function creates at least 3 sections: .text, .pdata, 294 # and .xdata. 295 if (CMAKE_SIZEOF_VOID_P EQUAL 8) 296 append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 297 endif() 298 endif() 299 300 if( MSVC ) 301 if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0 ) 302 # For MSVC 2013, disable iterator null pointer checking in debug mode, 303 # especially so std::equal(nullptr, nullptr, nullptr) will not assert. 304 add_definitions("-D_DEBUG_POINTER_IMPL=") 305 endif() 306 307 include(ChooseMSVCCRT) 308 309 if( MSVC11 ) 310 add_definitions(-D_VARIADIC_MAX=10) 311 endif() 312 313 # Add definitions that make MSVC much less annoying. 314 add_definitions( 315 # For some reason MS wants to deprecate a bunch of standard functions... 316 -D_CRT_SECURE_NO_DEPRECATE 317 -D_CRT_SECURE_NO_WARNINGS 318 -D_CRT_NONSTDC_NO_DEPRECATE 319 -D_CRT_NONSTDC_NO_WARNINGS 320 -D_SCL_SECURE_NO_DEPRECATE 321 -D_SCL_SECURE_NO_WARNINGS 322 ) 323 324 # Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI. 325 add_definitions( 326 -DUNICODE 327 -D_UNICODE 328 ) 329 330 if (LLVM_ENABLE_WERROR) 331 append("/WX" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 332 endif (LLVM_ENABLE_WERROR) 333 334 append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 335 336 # /Zc:strictStrings is incompatible with VS12's (Visual Studio 2013's) 337 # debug mode headers. Instead of only enabling them in VS2013's debug mode, 338 # we'll just enable them for Visual Studio 2015 (VS 14, MSVC_VERSION 1900) 339 # and up. 340 if (NOT (MSVC_VERSION LESS 1900)) 341 # Disable string literal const->non-const type conversion. 342 # "When specified, the compiler requires strict const-qualification 343 # conformance for pointers initialized by using string literals." 344 append("/Zc:strictStrings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 345 endif(NOT (MSVC_VERSION LESS 1900)) 346 347 # "Generate Intrinsic Functions". 348 append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 349 350 # "Enforce type conversion rules". 351 append("/Zc:rvalueCast" CMAKE_CXX_FLAGS) 352 353 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO) 354 # clang-cl and cl by default produce non-deterministic binaries because 355 # link.exe /incremental requires a timestamp in the .obj file. clang-cl 356 # has the flag /Brepro to force deterministic binaries. We want to pass that 357 # whenever you're building with clang unless you're passing /incremental 358 # or using LTO (/Brepro with LTO would result in a warning about the flag 359 # being unused, because we're not generating object files). 360 # This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag() 361 # because cl.exe does not emit an error on flags it doesn't understand, 362 # letting check_cxx_compiler_flag() claim it understands all flags. 363 check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO) 364 if (SUPPORTS_BREPRO) 365 # Check if /INCREMENTAL is passed to the linker and complain that it 366 # won't work with /Brepro. 367 string(TOUPPER "${CMAKE_EXE_LINKER_FLAGS}" upper_exe_flags) 368 string(TOUPPER "${CMAKE_MODULE_LINKER_FLAGS}" upper_module_flags) 369 string(TOUPPER "${CMAKE_SHARED_LINKER_FLAGS}" upper_shared_flags) 370 371 string(FIND "${upper_exe_flags} ${upper_module_flags} ${upper_shared_flags}" 372 "/INCREMENTAL" linker_flag_idx) 373 374 if (${linker_flag_idx} GREATER -1) 375 message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic") 376 else() 377 append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 378 endif() 379 endif() 380 endif() 381 382 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 383 append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 384 add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME) 385 if (LLVM_ENABLE_CXX1Y) 386 check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y) 387 append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" CMAKE_CXX_FLAGS) 388 elseif(LLVM_ENABLE_CXX1Z) 389 check_cxx_compiler_flag("-std=c++1z" CXX_SUPPORTS_CXX1Z) 390 append_if(CXX_SUPPORTS_CXX1Z "-std=c++1z" CMAKE_CXX_FLAGS) 391 else() 392 check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11) 393 if (CXX_SUPPORTS_CXX11) 394 if (CYGWIN OR MINGW) 395 # MinGW and Cygwin are a bit stricter and lack things like 396 # 'strdup', 'stricmp', etc in c++11 mode. 397 append("-std=gnu++11" CMAKE_CXX_FLAGS) 398 else() 399 append("-std=c++11" CMAKE_CXX_FLAGS) 400 endif() 401 else() 402 message(FATAL_ERROR "LLVM requires C++11 support but the '-std=c++11' flag isn't supported.") 403 endif() 404 endif() 405 if (LLVM_ENABLE_MODULES) 406 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 407 set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache") 408 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin") 409 # On Darwin -fmodules does not imply -fcxx-modules. 410 set(module_flags "${module_flags} -fcxx-modules") 411 endif() 412 if (LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY) 413 set(module_flags "${module_flags} -Xclang -fmodules-local-submodule-visibility") 414 endif() 415 if (LLVM_ENABLE_MODULE_DEBUGGING AND 416 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR 417 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO"))) 418 set(module_flags "${module_flags} -gmodules") 419 endif() 420 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${module_flags}") 421 422 # Check that we can build code with modules enabled, and that repeatedly 423 # including <cassert> still manages to respect NDEBUG properly. 424 CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG 425 #include <cassert> 426 #define NDEBUG 427 #include <cassert> 428 int main() { assert(this code is not compiled); }" 429 CXX_SUPPORTS_MODULES) 430 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 431 if (CXX_SUPPORTS_MODULES) 432 append("${module_flags}" CMAKE_CXX_FLAGS) 433 else() 434 message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler") 435 endif() 436 endif(LLVM_ENABLE_MODULES) 437 endif( MSVC ) 438 439 if (MSVC AND NOT CLANG_CL) 440 set(msvc_warning_flags 441 # Disabled warnings. 442 -wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline) 443 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 444 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored' 445 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 446 -wd4258 # Suppress ''var' : definition from the for loop is ignored; the definition from the enclosing scope is used' 447 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 448 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' 449 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized' 450 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 451 -wd4355 # Suppress ''this' : used in base member initializer list' 452 -wd4456 # Suppress 'declaration of 'var' hides local variable' 453 -wd4457 # Suppress 'declaration of 'var' hides function parameter' 454 -wd4458 # Suppress 'declaration of 'var' hides class member' 455 -wd4459 # Suppress 'declaration of 'var' hides global declaration' 456 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 457 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 458 -wd4722 # Suppress 'function' : destructor never returns, potential memory leak 459 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)' 460 -wd4100 # Suppress 'unreferenced formal parameter' 461 -wd4127 # Suppress 'conditional expression is constant' 462 -wd4512 # Suppress 'assignment operator could not be generated' 463 -wd4505 # Suppress 'unreferenced local function has been removed' 464 -wd4610 # Suppress '<class> can never be instantiated' 465 -wd4510 # Suppress 'default constructor could not be generated' 466 -wd4702 # Suppress 'unreachable code' 467 -wd4245 # Suppress 'signed/unsigned mismatch' 468 -wd4706 # Suppress 'assignment within conditional expression' 469 -wd4310 # Suppress 'cast truncates constant value' 470 -wd4701 # Suppress 'potentially uninitialized local variable' 471 -wd4703 # Suppress 'potentially uninitialized local pointer variable' 472 -wd4389 # Suppress 'signed/unsigned mismatch' 473 -wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable' 474 -wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation' 475 -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer' 476 -wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed' 477 -wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared' 478 # C4592 is disabled because of false positives in Visual Studio 2015 479 # Update 1. Re-evaluate the usefulness of this diagnostic with Update 2. 480 -wd4592 # Suppress ''var': symbol will be dynamically initialized (implementation limitation) 481 -wd4319 # Suppress ''operator' : zero extending 'type' to 'type' of greater size' 482 483 # Ideally, we'd like this warning to be enabled, but MSVC 2013 doesn't 484 # support the 'aligned' attribute in the way that clang sources requires (for 485 # any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to 486 # avoid unwanted alignment warnings. 487 # When we switch to requiring a version of MSVC that supports the 'alignas' 488 # specifier (MSVC 2015?) this warning can be re-enabled. 489 -wd4324 # Suppress 'structure was padded due to __declspec(align())' 490 491 # Promoted warnings. 492 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 493 494 # Promoted warnings to errors. 495 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 496 ) 497 498 # Enable warnings 499 if (LLVM_ENABLE_WARNINGS) 500 # Put /W4 in front of all the -we flags. cl.exe doesn't care, but for 501 # clang-cl having /W4 after the -we flags will re-enable the warnings 502 # disabled by -we. 503 set(msvc_warning_flags "/W4 ${msvc_warning_flags}") 504 # CMake appends /W3 by default, and having /W3 followed by /W4 will result in 505 # cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is 506 # a command line warning and not a compiler warning, it cannot be suppressed except 507 # by fixing the command line. 508 string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") 509 string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 510 511 if (LLVM_ENABLE_PEDANTIC) 512 # No MSVC equivalent available 513 endif (LLVM_ENABLE_PEDANTIC) 514 endif (LLVM_ENABLE_WARNINGS) 515 516 foreach(flag ${msvc_warning_flags}) 517 append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 518 endforeach(flag) 519 endif (MSVC AND NOT CLANG_CL) 520 521 if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 522 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 523 append("-Wcast-qual" CMAKE_CXX_FLAGS) 524 525 # Turn off missing field initializer warnings for gcc to avoid noise from 526 # false positives with empty {}. Turn them on otherwise (they're off by 527 # default for clang). 528 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 529 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 530 if (CMAKE_COMPILER_IS_GNUCXX) 531 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 532 else() 533 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 534 endif() 535 endif() 536 537 if (LLVM_ENABLE_PEDANTIC AND LLVM_COMPILER_IS_GCC_COMPATIBLE) 538 append("-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 539 append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 540 endif() 541 542 add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG) 543 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS) 544 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS) 545 546 # Check if -Wnon-virtual-dtor warns even though the class is marked final. 547 # If it does, don't add it. So it won't be added on clang 3.4 and older. 548 # This also catches cases when -Wnon-virtual-dtor isn't supported by 549 # the compiler at all. This flag is not activated for gcc since it will 550 # incorrectly identify a protected non-virtual base when there is a friend 551 # declaration. Don't activate this in general on Windows as this warning has 552 # too many false positives on COM-style classes, which are destroyed with 553 # Release() (PR32286). 554 if (NOT CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32) 555 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 556 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11 -Werror=non-virtual-dtor") 557 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();protected: ~base();}; 558 class derived final : public base { public: ~derived();}; 559 int main() { return 0; }" 560 CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR) 561 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 562 append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR 563 "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS) 564 endif() 565 566 # Enable -Wdelete-non-virtual-dtor if available. 567 add_flag_if_supported("-Wdelete-non-virtual-dtor" DELETE_NON_VIRTUAL_DTOR_FLAG) 568 569 # Check if -Wcomment is OK with an // comment ending with '\' if the next 570 # line is also a // comment. 571 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 572 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment") 573 CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main() {return 0;}" 574 C_WCOMMENT_ALLOWS_LINE_WRAP) 575 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 576 if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP) 577 append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 578 endif() 579 580 # Enable -Wstring-conversion to catch misuse of string literals. 581 add_flag_if_supported("-Wstring-conversion" STRING_CONVERSION_FLAG) 582 endif (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 583 584 if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT LLVM_ENABLE_WARNINGS) 585 append("-w" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 586 endif() 587 588 macro(append_common_sanitizer_flags) 589 if (NOT MSVC) 590 # Append -fno-omit-frame-pointer and turn on debug info to get better 591 # stack traces. 592 add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER) 593 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 594 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 595 add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY) 596 endif() 597 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large. 598 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 599 add_flag_if_supported("-O1" O1) 600 endif() 601 elseif (CLANG_CL) 602 # Keep frame pointers around. 603 append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 604 if (LINKER_IS_LLD_LINK) 605 # Use DWARF debug info with LLD. 606 append("-gdwarf" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 607 else() 608 # Enable codeview otherwise. 609 append("/Z7" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 610 endif() 611 # Always ask the linker to produce symbols with asan. 612 append("-debug" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 613 endif() 614 endmacro() 615 616 # Turn on sanitizers if necessary. 617 if(LLVM_USE_SANITIZER) 618 if (LLVM_ON_UNIX) 619 if (LLVM_USE_SANITIZER STREQUAL "Address") 620 append_common_sanitizer_flags() 621 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 622 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 623 append_common_sanitizer_flags() 624 append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 625 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 626 append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 627 endif() 628 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 629 append_common_sanitizer_flags() 630 append("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all" 631 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 632 set(BLACKLIST_FILE "${CMAKE_SOURCE_DIR}/utils/sanitizers/ubsan_blacklist.txt") 633 if (EXISTS "${BLACKLIST_FILE}") 634 append("-fsanitize-blacklist=${BLACKLIST_FILE}" 635 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 636 endif() 637 elseif (LLVM_USE_SANITIZER STREQUAL "Thread") 638 append_common_sanitizer_flags() 639 append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 640 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 641 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 642 append_common_sanitizer_flags() 643 append("-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all" 644 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 645 else() 646 message(FATAL_ERROR "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 647 endif() 648 elseif(MSVC) 649 if (LLVM_USE_SANITIZER STREQUAL "Address") 650 append_common_sanitizer_flags() 651 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 652 else() 653 message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}") 654 endif() 655 else() 656 message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.") 657 endif() 658 if (LLVM_USE_SANITIZER MATCHES "(Undefined;)?Address(;Undefined)?") 659 add_flag_if_supported("-fsanitize-address-use-after-scope" 660 FSANITIZE_USE_AFTER_SCOPE_FLAG) 661 endif() 662 if (LLVM_USE_SANITIZE_COVERAGE) 663 append("-fsanitize-coverage=trace-pc-guard,indirect-calls,trace-cmp" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 664 endif() 665 endif() 666 667 # Turn on -gsplit-dwarf if requested 668 if(LLVM_USE_SPLIT_DWARF) 669 add_definitions("-gsplit-dwarf") 670 endif() 671 672 add_definitions( -D__STDC_CONSTANT_MACROS ) 673 add_definitions( -D__STDC_FORMAT_MACROS ) 674 add_definitions( -D__STDC_LIMIT_MACROS ) 675 676 # clang doesn't print colored diagnostics when invoked from Ninja 677 if (UNIX AND 678 CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND 679 CMAKE_GENERATOR STREQUAL "Ninja") 680 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 681 endif() 682 683 # lld doesn't print colored diagnostics when invoked from Ninja 684 if (UNIX AND CMAKE_GENERATOR STREQUAL "Ninja") 685 include(CheckLinkerFlag) 686 check_linker_flag("-Wl,-color-diagnostics" LINKER_SUPPORTS_COLOR_DIAGNOSTICS) 687 append_if(LINKER_SUPPORTS_COLOR_DIAGNOSTICS "-Wl,-color-diagnostics" 688 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 689 endif() 690 691 # Add flags for add_dead_strip(). 692 # FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF? 693 # But MinSizeRel seems to add that automatically, so maybe disable these 694 # flags instead if LLVM_NO_DEAD_STRIP is set. 695 if(NOT CYGWIN AND NOT WIN32) 696 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND 697 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 698 check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS) 699 if (C_SUPPORTS_FNO_FUNCTION_SECTIONS) 700 # Don't add -ffunction-section if it can be disabled with -fno-function-sections. 701 # Doing so will break sanitizers. 702 add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS) 703 endif() 704 add_flag_if_supported("-fdata-sections" FDATA_SECTIONS) 705 endif() 706 endif() 707 708 if(MSVC) 709 # Remove flags here, for exceptions and RTTI. 710 # Each target property or source property should be responsible to control 711 # them. 712 # CL.EXE complains to override flags like "/GR /GR-". 713 string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 714 string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 715 endif() 716 717 # Provide public options to globally control RTTI and EH 718 option(LLVM_ENABLE_EH "Enable Exception handling" OFF) 719 option(LLVM_ENABLE_RTTI "Enable run time type information" OFF) 720 if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI) 721 message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON") 722 endif() 723 724 option(LLVM_BUILD_INSTRUMENTED "Build LLVM and tools with PGO instrumentation (experimental)" Off) 725 mark_as_advanced(LLVM_BUILD_INSTRUMENTED) 726 append_if(LLVM_BUILD_INSTRUMENTED "-fprofile-instr-generate='${LLVM_PROFILE_FILE_PATTERN}'" 727 CMAKE_CXX_FLAGS 728 CMAKE_C_FLAGS 729 CMAKE_EXE_LINKER_FLAGS 730 CMAKE_SHARED_LINKER_FLAGS) 731 732 option(LLVM_BUILD_INSTRUMENTED_COVERAGE "Build LLVM and tools with Code Coverage instrumentation (experimental)" Off) 733 mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE) 734 append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate='${LLVM_PROFILE_FILE_PATTERN}' -fcoverage-mapping" 735 CMAKE_CXX_FLAGS 736 CMAKE_C_FLAGS 737 CMAKE_EXE_LINKER_FLAGS 738 CMAKE_SHARED_LINKER_FLAGS) 739 740 if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK) 741 message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)") 742 endif() 743 if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 744 append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 745 if(NOT LINKER_IS_LLD_LINK) 746 append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 747 endif() 748 # If the linker supports it, enable the lto cache. This improves initial build 749 # time a little since we re-link a lot of the same objects, and significantly 750 # improves incremental build time. 751 # FIXME: We should move all this logic into the clang driver. 752 if(APPLE) 753 append("-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache" 754 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 755 elseif(UNIX AND LLVM_USE_LINKER STREQUAL "lld") 756 append("-Wl,--thinlto-cache-dir=${PROJECT_BINARY_DIR}/lto.cache" 757 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 758 elseif(LLVM_USE_LINKER STREQUAL "gold") 759 append("-Wl,--plugin-opt,cache-dir=${PROJECT_BINARY_DIR}/lto.cache" 760 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 761 endif() 762 elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL") 763 append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 764 if(NOT LINKER_IS_LLD_LINK) 765 append("-flto=full" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 766 endif() 767 elseif(LLVM_ENABLE_LTO) 768 append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 769 if(NOT LINKER_IS_LLD_LINK) 770 append("-flto" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 771 endif() 772 endif() 773 774 # This option makes utils/extract_symbols.py be used to determine the list of 775 # symbols to export from LLVM tools. This is necessary when using MSVC if you 776 # want to allow plugins, though note that the plugin has to explicitly link 777 # against (exactly one) tool so we can't unilaterally turn on 778 # LLVM_ENABLE_PLUGINS when it's enabled. 779 option(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS "Export symbols from LLVM tools so that plugins can import them" OFF) 780 if(BUILD_SHARED_LIBS AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 781 message(FATAL_ERROR "BUILD_SHARED_LIBS not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 782 endif() 783 if(LLVM_LINK_LLVM_DYLIB AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 784 message(FATAL_ERROR "LLVM_LINK_LLVM_DYLIB not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 785 endif() 786 787 # Plugin support 788 # FIXME: Make this configurable. 789 if(WIN32 OR CYGWIN) 790 if(BUILD_SHARED_LIBS OR LLVM_BUILD_LLVM_DYLIB) 791 set(LLVM_ENABLE_PLUGINS ON) 792 else() 793 set(LLVM_ENABLE_PLUGINS OFF) 794 endif() 795 else() 796 set(LLVM_ENABLE_PLUGINS ON) 797 endif() 798 799 function(get_compile_definitions) 800 get_directory_property(top_dir_definitions DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS) 801 foreach(definition ${top_dir_definitions}) 802 if(DEFINED result) 803 string(APPEND result " -D${definition}") 804 else() 805 set(result "-D${definition}") 806 endif() 807 endforeach() 808 set(LLVM_DEFINITIONS "${result}" PARENT_SCOPE) 809 endfunction() 810 get_compile_definitions() 811
