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 # Android until version N (API 24) doesn't support it. 238 if (ANDROID AND (ANDROID_NATIVE_API_LEVEL LESS 24)) 239 set(LLVM_FORCE_SMALLFILE_FOR_ANDROID TRUE) 240 endif() 241 if( CMAKE_SIZEOF_VOID_P EQUAL 4 AND NOT LLVM_FORCE_SMALLFILE_FOR_ANDROID) 242 add_definitions( -D_LARGEFILE_SOURCE ) 243 add_definitions( -D_FILE_OFFSET_BITS=64 ) 244 endif() 245 246 if( XCODE ) 247 # For Xcode enable several build settings that correspond to 248 # many warnings that are on by default in Clang but are 249 # not enabled for historical reasons. For versions of Xcode 250 # that do not support these options they will simply 251 # be ignored. 252 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES") 253 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES") 254 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES") 255 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES") 256 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES") 257 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES") 258 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES") 259 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES") 260 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES") 261 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES") 262 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES") 263 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES") 264 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES") 265 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES") 266 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES") 267 endif() 268 269 # On Win32 using MS tools, provide an option to set the number of parallel jobs 270 # to use. 271 if( MSVC_IDE ) 272 set(LLVM_COMPILER_JOBS "0" CACHE STRING 273 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 274 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 275 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 276 add_definitions( /MP ) 277 else() 278 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 279 add_definitions( /MP${LLVM_COMPILER_JOBS} ) 280 endif() 281 else() 282 message(STATUS "Parallel compilation disabled") 283 endif() 284 endif() 285 286 # set stack reserved size to ~10MB 287 if(MSVC) 288 # CMake previously automatically set this value for MSVC builds, but the 289 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default 290 # value (1 MB) which is not enough for us in tasks such as parsing recursive 291 # C++ templates in Clang. 292 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000") 293 elseif(MINGW) # FIXME: Also cygwin? 294 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216") 295 296 # Pass -mbig-obj to mingw gas on Win64. COFF has a 2**16 section limit, and 297 # on Win64, every COMDAT function creates at least 3 sections: .text, .pdata, 298 # and .xdata. 299 if (CMAKE_SIZEOF_VOID_P EQUAL 8) 300 append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 301 endif() 302 endif() 303 304 if( MSVC ) 305 if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0 ) 306 # For MSVC 2013, disable iterator null pointer checking in debug mode, 307 # especially so std::equal(nullptr, nullptr, nullptr) will not assert. 308 add_definitions("-D_DEBUG_POINTER_IMPL=") 309 endif() 310 311 include(ChooseMSVCCRT) 312 313 if( MSVC11 ) 314 add_definitions(-D_VARIADIC_MAX=10) 315 endif() 316 317 # Add definitions that make MSVC much less annoying. 318 add_definitions( 319 # For some reason MS wants to deprecate a bunch of standard functions... 320 -D_CRT_SECURE_NO_DEPRECATE 321 -D_CRT_SECURE_NO_WARNINGS 322 -D_CRT_NONSTDC_NO_DEPRECATE 323 -D_CRT_NONSTDC_NO_WARNINGS 324 -D_SCL_SECURE_NO_DEPRECATE 325 -D_SCL_SECURE_NO_WARNINGS 326 ) 327 328 # Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI. 329 add_definitions( 330 -DUNICODE 331 -D_UNICODE 332 ) 333 334 if (LLVM_ENABLE_WERROR) 335 append("/WX" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 336 endif (LLVM_ENABLE_WERROR) 337 338 append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 339 340 # /Zc:strictStrings is incompatible with VS12's (Visual Studio 2013's) 341 # debug mode headers. Instead of only enabling them in VS2013's debug mode, 342 # we'll just enable them for Visual Studio 2015 (VS 14, MSVC_VERSION 1900) 343 # and up. 344 if (NOT (MSVC_VERSION LESS 1900)) 345 # Disable string literal const->non-const type conversion. 346 # "When specified, the compiler requires strict const-qualification 347 # conformance for pointers initialized by using string literals." 348 append("/Zc:strictStrings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 349 endif(NOT (MSVC_VERSION LESS 1900)) 350 351 # "Generate Intrinsic Functions". 352 append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 353 354 # "Enforce type conversion rules". 355 append("/Zc:rvalueCast" CMAKE_CXX_FLAGS) 356 357 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO) 358 # clang-cl and cl by default produce non-deterministic binaries because 359 # link.exe /incremental requires a timestamp in the .obj file. clang-cl 360 # has the flag /Brepro to force deterministic binaries. We want to pass that 361 # whenever you're building with clang unless you're passing /incremental 362 # or using LTO (/Brepro with LTO would result in a warning about the flag 363 # being unused, because we're not generating object files). 364 # This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag() 365 # because cl.exe does not emit an error on flags it doesn't understand, 366 # letting check_cxx_compiler_flag() claim it understands all flags. 367 check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO) 368 if (SUPPORTS_BREPRO) 369 # Check if /INCREMENTAL is passed to the linker and complain that it 370 # won't work with /Brepro. 371 string(TOUPPER "${CMAKE_EXE_LINKER_FLAGS}" upper_exe_flags) 372 string(TOUPPER "${CMAKE_MODULE_LINKER_FLAGS}" upper_module_flags) 373 string(TOUPPER "${CMAKE_SHARED_LINKER_FLAGS}" upper_shared_flags) 374 375 string(FIND "${upper_exe_flags} ${upper_module_flags} ${upper_shared_flags}" 376 "/INCREMENTAL" linker_flag_idx) 377 378 if (${linker_flag_idx} GREATER -1) 379 message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic") 380 else() 381 append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 382 endif() 383 endif() 384 endif() 385 386 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 387 append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 388 append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS) 389 add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME) 390 add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW) 391 if (LLVM_ENABLE_CXX1Y) 392 check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y) 393 append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" CMAKE_CXX_FLAGS) 394 elseif(LLVM_ENABLE_CXX1Z) 395 check_cxx_compiler_flag("-std=c++1z" CXX_SUPPORTS_CXX1Z) 396 append_if(CXX_SUPPORTS_CXX1Z "-std=c++1z" CMAKE_CXX_FLAGS) 397 else() 398 check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11) 399 if (CXX_SUPPORTS_CXX11) 400 if (CYGWIN OR MINGW) 401 # MinGW and Cygwin are a bit stricter and lack things like 402 # 'strdup', 'stricmp', etc in c++11 mode. 403 append("-std=gnu++11" CMAKE_CXX_FLAGS) 404 else() 405 append("-std=c++11" CMAKE_CXX_FLAGS) 406 endif() 407 else() 408 message(FATAL_ERROR "LLVM requires C++11 support but the '-std=c++11' flag isn't supported.") 409 endif() 410 endif() 411 if (LLVM_ENABLE_MODULES) 412 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 413 set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache") 414 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin") 415 # On Darwin -fmodules does not imply -fcxx-modules. 416 set(module_flags "${module_flags} -fcxx-modules") 417 endif() 418 if (LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY) 419 set(module_flags "${module_flags} -Xclang -fmodules-local-submodule-visibility") 420 endif() 421 if (LLVM_ENABLE_MODULE_DEBUGGING AND 422 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR 423 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO"))) 424 set(module_flags "${module_flags} -gmodules") 425 endif() 426 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${module_flags}") 427 428 # Check that we can build code with modules enabled, and that repeatedly 429 # including <cassert> still manages to respect NDEBUG properly. 430 CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG 431 #include <cassert> 432 #define NDEBUG 433 #include <cassert> 434 int main() { assert(this code is not compiled); }" 435 CXX_SUPPORTS_MODULES) 436 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 437 if (CXX_SUPPORTS_MODULES) 438 append("${module_flags}" CMAKE_CXX_FLAGS) 439 else() 440 message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler") 441 endif() 442 endif(LLVM_ENABLE_MODULES) 443 endif( MSVC ) 444 445 if (MSVC AND NOT CLANG_CL) 446 set(msvc_warning_flags 447 # Disabled warnings. 448 -wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline) 449 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 450 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored' 451 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 452 -wd4258 # Suppress ''var' : definition from the for loop is ignored; the definition from the enclosing scope is used' 453 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 454 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' 455 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized' 456 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 457 -wd4355 # Suppress ''this' : used in base member initializer list' 458 -wd4456 # Suppress 'declaration of 'var' hides local variable' 459 -wd4457 # Suppress 'declaration of 'var' hides function parameter' 460 -wd4458 # Suppress 'declaration of 'var' hides class member' 461 -wd4459 # Suppress 'declaration of 'var' hides global declaration' 462 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 463 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 464 -wd4722 # Suppress 'function' : destructor never returns, potential memory leak 465 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)' 466 -wd4100 # Suppress 'unreferenced formal parameter' 467 -wd4127 # Suppress 'conditional expression is constant' 468 -wd4512 # Suppress 'assignment operator could not be generated' 469 -wd4505 # Suppress 'unreferenced local function has been removed' 470 -wd4610 # Suppress '<class> can never be instantiated' 471 -wd4510 # Suppress 'default constructor could not be generated' 472 -wd4702 # Suppress 'unreachable code' 473 -wd4245 # Suppress 'signed/unsigned mismatch' 474 -wd4706 # Suppress 'assignment within conditional expression' 475 -wd4310 # Suppress 'cast truncates constant value' 476 -wd4701 # Suppress 'potentially uninitialized local variable' 477 -wd4703 # Suppress 'potentially uninitialized local pointer variable' 478 -wd4389 # Suppress 'signed/unsigned mismatch' 479 -wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable' 480 -wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation' 481 -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer' 482 -wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed' 483 -wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared' 484 # C4592 is disabled because of false positives in Visual Studio 2015 485 # Update 1. Re-evaluate the usefulness of this diagnostic with Update 2. 486 -wd4592 # Suppress ''var': symbol will be dynamically initialized (implementation limitation) 487 -wd4319 # Suppress ''operator' : zero extending 'type' to 'type' of greater size' 488 489 # Ideally, we'd like this warning to be enabled, but MSVC 2013 doesn't 490 # support the 'aligned' attribute in the way that clang sources requires (for 491 # any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to 492 # avoid unwanted alignment warnings. 493 # When we switch to requiring a version of MSVC that supports the 'alignas' 494 # specifier (MSVC 2015?) this warning can be re-enabled. 495 -wd4324 # Suppress 'structure was padded due to __declspec(align())' 496 497 # Promoted warnings. 498 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 499 500 # Promoted warnings to errors. 501 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 502 ) 503 504 # Enable warnings 505 if (LLVM_ENABLE_WARNINGS) 506 # Put /W4 in front of all the -we flags. cl.exe doesn't care, but for 507 # clang-cl having /W4 after the -we flags will re-enable the warnings 508 # disabled by -we. 509 set(msvc_warning_flags "/W4 ${msvc_warning_flags}") 510 # CMake appends /W3 by default, and having /W3 followed by /W4 will result in 511 # cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is 512 # a command line warning and not a compiler warning, it cannot be suppressed except 513 # by fixing the command line. 514 string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") 515 string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 516 517 if (LLVM_ENABLE_PEDANTIC) 518 # No MSVC equivalent available 519 endif (LLVM_ENABLE_PEDANTIC) 520 endif (LLVM_ENABLE_WARNINGS) 521 522 foreach(flag ${msvc_warning_flags}) 523 append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 524 endforeach(flag) 525 endif (MSVC AND NOT CLANG_CL) 526 527 if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 528 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 529 append("-Wcast-qual" CMAKE_CXX_FLAGS) 530 531 # Turn off missing field initializer warnings for gcc to avoid noise from 532 # false positives with empty {}. Turn them on otherwise (they're off by 533 # default for clang). 534 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 535 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 536 if (CMAKE_COMPILER_IS_GNUCXX) 537 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 538 else() 539 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 540 endif() 541 endif() 542 543 if (LLVM_ENABLE_PEDANTIC AND LLVM_COMPILER_IS_GCC_COMPATIBLE) 544 append("-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 545 append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 546 endif() 547 548 add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG) 549 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS) 550 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS) 551 552 # Check if -Wnon-virtual-dtor warns even though the class is marked final. 553 # If it does, don't add it. So it won't be added on clang 3.4 and older. 554 # This also catches cases when -Wnon-virtual-dtor isn't supported by 555 # the compiler at all. This flag is not activated for gcc since it will 556 # incorrectly identify a protected non-virtual base when there is a friend 557 # declaration. Don't activate this in general on Windows as this warning has 558 # too many false positives on COM-style classes, which are destroyed with 559 # Release() (PR32286). 560 if (NOT CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32) 561 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 562 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11 -Werror=non-virtual-dtor") 563 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();protected: ~base();}; 564 class derived final : public base { public: ~derived();}; 565 int main() { return 0; }" 566 CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR) 567 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 568 append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR 569 "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS) 570 endif() 571 572 # Enable -Wdelete-non-virtual-dtor if available. 573 add_flag_if_supported("-Wdelete-non-virtual-dtor" DELETE_NON_VIRTUAL_DTOR_FLAG) 574 575 # Check if -Wcomment is OK with an // comment ending with '\' if the next 576 # line is also a // comment. 577 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 578 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment") 579 CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main() {return 0;}" 580 C_WCOMMENT_ALLOWS_LINE_WRAP) 581 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 582 if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP) 583 append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 584 endif() 585 586 # Enable -Wstring-conversion to catch misuse of string literals. 587 add_flag_if_supported("-Wstring-conversion" STRING_CONVERSION_FLAG) 588 endif (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 589 590 if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT LLVM_ENABLE_WARNINGS) 591 append("-w" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 592 endif() 593 594 macro(append_common_sanitizer_flags) 595 if (NOT MSVC) 596 # Append -fno-omit-frame-pointer and turn on debug info to get better 597 # stack traces. 598 add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER) 599 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 600 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 601 add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY) 602 endif() 603 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large. 604 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 605 add_flag_if_supported("-O1" O1) 606 endif() 607 elseif (CLANG_CL) 608 # Keep frame pointers around. 609 append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 610 if (LINKER_IS_LLD_LINK) 611 # Use DWARF debug info with LLD. 612 append("-gdwarf" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 613 else() 614 # Enable codeview otherwise. 615 append("/Z7" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 616 endif() 617 # Always ask the linker to produce symbols with asan. 618 append("-debug" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 619 endif() 620 endmacro() 621 622 # Turn on sanitizers if necessary. 623 if(LLVM_USE_SANITIZER) 624 if (LLVM_ON_UNIX) 625 if (LLVM_USE_SANITIZER STREQUAL "Address") 626 append_common_sanitizer_flags() 627 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 628 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 629 append_common_sanitizer_flags() 630 append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 631 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 632 append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 633 endif() 634 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 635 append_common_sanitizer_flags() 636 append("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all" 637 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 638 set(BLACKLIST_FILE "${CMAKE_SOURCE_DIR}/utils/sanitizers/ubsan_blacklist.txt") 639 if (EXISTS "${BLACKLIST_FILE}") 640 append("-fsanitize-blacklist=${BLACKLIST_FILE}" 641 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 642 endif() 643 elseif (LLVM_USE_SANITIZER STREQUAL "Thread") 644 append_common_sanitizer_flags() 645 append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 646 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 647 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 648 append_common_sanitizer_flags() 649 append("-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all" 650 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 651 elseif (LLVM_USE_SANITIZER STREQUAL "Leaks") 652 append_common_sanitizer_flags() 653 append("-fsanitize=leak" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 654 else() 655 message(FATAL_ERROR "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 656 endif() 657 elseif(MSVC) 658 if (LLVM_USE_SANITIZER STREQUAL "Address") 659 append_common_sanitizer_flags() 660 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 661 else() 662 message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}") 663 endif() 664 else() 665 message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.") 666 endif() 667 if (LLVM_USE_SANITIZER MATCHES "(Undefined;)?Address(;Undefined)?") 668 add_flag_if_supported("-fsanitize-address-use-after-scope" 669 FSANITIZE_USE_AFTER_SCOPE_FLAG) 670 endif() 671 if (LLVM_USE_SANITIZE_COVERAGE) 672 append("-fsanitize=fuzzer-no-link" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 673 endif() 674 endif() 675 676 # Turn on -gsplit-dwarf if requested 677 if(LLVM_USE_SPLIT_DWARF) 678 add_definitions("-gsplit-dwarf") 679 endif() 680 681 add_definitions( -D__STDC_CONSTANT_MACROS ) 682 add_definitions( -D__STDC_FORMAT_MACROS ) 683 add_definitions( -D__STDC_LIMIT_MACROS ) 684 685 # clang doesn't print colored diagnostics when invoked from Ninja 686 if (UNIX AND 687 CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND 688 CMAKE_GENERATOR STREQUAL "Ninja") 689 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 690 endif() 691 692 # lld doesn't print colored diagnostics when invoked from Ninja 693 if (UNIX AND CMAKE_GENERATOR STREQUAL "Ninja") 694 include(CheckLinkerFlag) 695 check_linker_flag("-Wl,--color-diagnostics" LINKER_SUPPORTS_COLOR_DIAGNOSTICS) 696 append_if(LINKER_SUPPORTS_COLOR_DIAGNOSTICS "-Wl,--color-diagnostics" 697 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 698 endif() 699 700 # Add flags for add_dead_strip(). 701 # FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF? 702 # But MinSizeRel seems to add that automatically, so maybe disable these 703 # flags instead if LLVM_NO_DEAD_STRIP is set. 704 if(NOT CYGWIN AND NOT WIN32) 705 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND 706 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 707 check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS) 708 if (C_SUPPORTS_FNO_FUNCTION_SECTIONS) 709 # Don't add -ffunction-section if it can be disabled with -fno-function-sections. 710 # Doing so will break sanitizers. 711 add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS) 712 endif() 713 add_flag_if_supported("-fdata-sections" FDATA_SECTIONS) 714 endif() 715 endif() 716 717 if(MSVC) 718 # Remove flags here, for exceptions and RTTI. 719 # Each target property or source property should be responsible to control 720 # them. 721 # CL.EXE complains to override flags like "/GR /GR-". 722 string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 723 string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 724 endif() 725 726 # Provide public options to globally control RTTI and EH 727 option(LLVM_ENABLE_EH "Enable Exception handling" OFF) 728 option(LLVM_ENABLE_RTTI "Enable run time type information" OFF) 729 if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI) 730 message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON") 731 endif() 732 733 option(LLVM_ENABLE_IR_PGO "Build LLVM and tools with IR PGO instrumentation (experimental)" Off) 734 mark_as_advanced(LLVM_ENABLE_IR_PGO) 735 736 option(LLVM_BUILD_INSTRUMENTED "Build LLVM and tools with PGO instrumentation" Off) 737 mark_as_advanced(LLVM_BUILD_INSTRUMENTED) 738 739 if (LLVM_BUILD_INSTRUMENTED) 740 if (LLVM_ENABLE_IR_PGO) 741 append("-fprofile-generate='${LLVM_PROFILE_DATA_DIR}'" 742 CMAKE_CXX_FLAGS 743 CMAKE_C_FLAGS 744 CMAKE_EXE_LINKER_FLAGS 745 CMAKE_SHARED_LINKER_FLAGS) 746 else() 747 append("-fprofile-instr-generate='${LLVM_PROFILE_FILE_PATTERN}'" 748 CMAKE_CXX_FLAGS 749 CMAKE_C_FLAGS 750 CMAKE_EXE_LINKER_FLAGS 751 CMAKE_SHARED_LINKER_FLAGS) 752 endif() 753 endif() 754 755 option(LLVM_BUILD_INSTRUMENTED_COVERAGE "Build LLVM and tools with Code Coverage instrumentation" Off) 756 mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE) 757 append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate='${LLVM_PROFILE_FILE_PATTERN}' -fcoverage-mapping" 758 CMAKE_CXX_FLAGS 759 CMAKE_C_FLAGS 760 CMAKE_EXE_LINKER_FLAGS 761 CMAKE_SHARED_LINKER_FLAGS) 762 763 if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK) 764 message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)") 765 endif() 766 if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 767 append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 768 if(NOT LINKER_IS_LLD_LINK) 769 append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 770 endif() 771 # If the linker supports it, enable the lto cache. This improves initial build 772 # time a little since we re-link a lot of the same objects, and significantly 773 # improves incremental build time. 774 # FIXME: We should move all this logic into the clang driver. 775 if(APPLE) 776 append("-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache" 777 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 778 elseif(UNIX AND LLVM_USE_LINKER STREQUAL "lld") 779 append("-Wl,--thinlto-cache-dir=${PROJECT_BINARY_DIR}/lto.cache" 780 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 781 elseif(LLVM_USE_LINKER STREQUAL "gold") 782 append("-Wl,--plugin-opt,cache-dir=${PROJECT_BINARY_DIR}/lto.cache" 783 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 784 endif() 785 elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL") 786 append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 787 if(NOT LINKER_IS_LLD_LINK) 788 append("-flto=full" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 789 endif() 790 elseif(LLVM_ENABLE_LTO) 791 append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 792 if(NOT LINKER_IS_LLD_LINK) 793 append("-flto" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 794 endif() 795 endif() 796 797 # This option makes utils/extract_symbols.py be used to determine the list of 798 # symbols to export from LLVM tools. This is necessary when using MSVC if you 799 # want to allow plugins, though note that the plugin has to explicitly link 800 # against (exactly one) tool so we can't unilaterally turn on 801 # LLVM_ENABLE_PLUGINS when it's enabled. 802 option(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS "Export symbols from LLVM tools so that plugins can import them" OFF) 803 if(BUILD_SHARED_LIBS AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 804 message(FATAL_ERROR "BUILD_SHARED_LIBS not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 805 endif() 806 if(LLVM_LINK_LLVM_DYLIB AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 807 message(FATAL_ERROR "LLVM_LINK_LLVM_DYLIB not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 808 endif() 809 810 # Plugin support 811 # FIXME: Make this configurable. 812 if(WIN32 OR CYGWIN) 813 if(BUILD_SHARED_LIBS OR LLVM_BUILD_LLVM_DYLIB) 814 set(LLVM_ENABLE_PLUGINS ON) 815 else() 816 set(LLVM_ENABLE_PLUGINS OFF) 817 endif() 818 else() 819 set(LLVM_ENABLE_PLUGINS ON) 820 endif() 821 822 function(get_compile_definitions) 823 get_directory_property(top_dir_definitions DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS) 824 foreach(definition ${top_dir_definitions}) 825 if(DEFINED result) 826 string(APPEND result " -D${definition}") 827 else() 828 set(result "-D${definition}") 829 endif() 830 endforeach() 831 set(LLVM_DEFINITIONS "${result}" PARENT_SCOPE) 832 endfunction() 833 get_compile_definitions() 834
