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 "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE) 8 9include(CheckCompilerVersion) 10include(HandleLLVMStdlib) 11include(CheckCCompilerFlag) 12include(CheckCXXCompilerFlag) 13 14if(CMAKE_LINKER MATCHES "lld-link.exe" OR (WIN32 AND LLVM_USE_LINKER STREQUAL "lld")) 15 set(LINKER_IS_LLD_LINK TRUE) 16else() 17 set(LINKER_IS_LLD_LINK FALSE) 18endif() 19 20set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO") 21string(TOUPPER "${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. 25set(LLVM_PARALLEL_COMPILE_JOBS "" CACHE STRING 26 "Define the maximum number of concurrent compilation jobs.") 27if(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=${LLVM_PARALLEL_COMPILE_JOBS}) 32 set(CMAKE_JOB_POOL_COMPILE compile_job_pool) 33 endif() 34endif() 35 36set(LLVM_PARALLEL_LINK_JOBS "" CACHE STRING 37 "Define the maximum number of concurrent link jobs.") 38if(CMAKE_MAKE_PROGRAM MATCHES "ninja") 39 if(NOT LLVM_PARALLEL_LINK_JOBS AND uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 40 message(STATUS "ThinLTO provides its own parallel linking - limiting parallel link jobs to 2.") 41 set(LLVM_PARALLEL_LINK_JOBS "2") 42 endif() 43 if(LLVM_PARALLEL_LINK_JOBS) 44 set_property(GLOBAL APPEND PROPERTY JOB_POOLS link_job_pool=${LLVM_PARALLEL_LINK_JOBS}) 45 set(CMAKE_JOB_POOL_LINK link_job_pool) 46 endif() 47elseif(LLVM_PARALLEL_LINK_JOBS) 48 message(WARNING "Job pooling is only available with Ninja generators.") 49endif() 50 51if( LLVM_ENABLE_ASSERTIONS ) 52 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 53 if( NOT MSVC ) 54 add_definitions( -D_DEBUG ) 55 endif() 56 # On non-Debug builds cmake automatically defines NDEBUG, so we 57 # explicitly undefine it: 58 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 59 add_definitions( -UNDEBUG ) 60 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines. 61 foreach (flags_var_to_scrub 62 CMAKE_CXX_FLAGS_RELEASE 63 CMAKE_CXX_FLAGS_RELWITHDEBINFO 64 CMAKE_CXX_FLAGS_MINSIZEREL 65 CMAKE_C_FLAGS_RELEASE 66 CMAKE_C_FLAGS_RELWITHDEBINFO 67 CMAKE_C_FLAGS_MINSIZEREL) 68 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " " 69 "${flags_var_to_scrub}" "${${flags_var_to_scrub}}") 70 endforeach() 71 endif() 72endif() 73 74if(LLVM_ENABLE_EXPENSIVE_CHECKS) 75 add_definitions(-DEXPENSIVE_CHECKS) 76 add_definitions(-D_GLIBCXX_DEBUG) 77endif() 78 79string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS) 80 81if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" ) 82 if( LLVM_ENABLE_ASSERTIONS ) 83 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 84 endif() 85elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" ) 86 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 87elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" ) 88 # We don't need to do anything special to turn off ABI breaking checks. 89elseif( NOT DEFINED LLVM_ABI_BREAKING_CHECKS ) 90 # Treat LLVM_ABI_BREAKING_CHECKS like "FORCE_OFF" when it has not been 91 # defined. 92else() 93 message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!") 94endif() 95 96if( LLVM_REVERSE_ITERATION ) 97 set( LLVM_ENABLE_REVERSE_ITERATION 1 ) 98endif() 99 100if(WIN32) 101 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 102 if(CYGWIN) 103 set(LLVM_ON_WIN32 0) 104 set(LLVM_ON_UNIX 1) 105 else(CYGWIN) 106 set(LLVM_ON_WIN32 1) 107 set(LLVM_ON_UNIX 0) 108 endif(CYGWIN) 109else(WIN32) 110 if(FUCHSIA OR UNIX) 111 set(LLVM_ON_WIN32 0) 112 set(LLVM_ON_UNIX 1) 113 if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "AIX") 114 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 115 else() 116 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1) 117 endif() 118 else(FUCHSIA OR UNIX) 119 MESSAGE(SEND_ERROR "Unable to determine platform") 120 endif(FUCHSIA OR UNIX) 121endif(WIN32) 122 123set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX}) 124set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 125 126# We use *.dylib rather than *.so on darwin. 127set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 128 129if(APPLE) 130 if(LLVM_ENABLE_LLD AND LLVM_ENABLE_LTO) 131 message(FATAL_ERROR "lld does not support LTO on Darwin") 132 endif() 133 # Darwin-specific linker flags for loadable modules. 134 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress") 135endif() 136 137# Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO 138# build might work on ELF but fail on MachO/COFF. 139if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32 OR CYGWIN OR 140 ${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD" OR 141 ${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD") AND 142 NOT LLVM_USE_SANITIZER) 143 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs") 144endif() 145 146# Pass -Wl,-z,nodelete. This makes sure our shared libraries are not unloaded 147# by dlclose(). We need that since the CLI API relies on cross-references 148# between global objects which became horribly broken when one of the libraries 149# is unloaded. 150if(${CMAKE_SYSTEM_NAME} MATCHES "Linux") 151 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,nodelete") 152 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-z,nodelete") 153endif() 154 155 156function(append value) 157 foreach(variable ${ARGN}) 158 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 159 endforeach(variable) 160endfunction() 161 162function(append_if condition value) 163 if (${condition}) 164 foreach(variable ${ARGN}) 165 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 166 endforeach(variable) 167 endif() 168endfunction() 169 170macro(add_flag_if_supported flag name) 171 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 172 append_if("C_SUPPORTS_${name}" "${flag}" CMAKE_C_FLAGS) 173 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 174 append_if("CXX_SUPPORTS_${name}" "${flag}" CMAKE_CXX_FLAGS) 175endmacro() 176 177function(add_flag_or_print_warning flag name) 178 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 179 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 180 if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${name}) 181 message(STATUS "Building with ${flag}") 182 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE) 183 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE) 184 set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${flag}" PARENT_SCOPE) 185 else() 186 message(WARNING "${flag} is not supported.") 187 endif() 188endfunction() 189 190if( LLVM_ENABLE_LLD ) 191 if ( LLVM_USE_LINKER ) 192 message(FATAL_ERROR "LLVM_ENABLE_LLD and LLVM_USE_LINKER can't be set at the same time") 193 endif() 194 set(LLVM_USE_LINKER "lld") 195endif() 196 197if( LLVM_USE_LINKER ) 198 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 199 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fuse-ld=${LLVM_USE_LINKER}") 200 check_cxx_source_compiles("int main() { return 0; }" CXX_SUPPORTS_CUSTOM_LINKER) 201 if ( NOT CXX_SUPPORTS_CUSTOM_LINKER ) 202 message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'") 203 endif() 204 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 205 append("-fuse-ld=${LLVM_USE_LINKER}" 206 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 207endif() 208 209if( LLVM_ENABLE_PIC ) 210 if( XCODE ) 211 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't 212 # know how to disable this, so just force ENABLE_PIC off for now. 213 message(WARNING "-fPIC not supported with Xcode.") 214 elseif( WIN32 OR CYGWIN) 215 # On Windows all code is PIC. MinGW warns if -fPIC is used. 216 else() 217 add_flag_or_print_warning("-fPIC" FPIC) 218 endif() 219endif() 220 221if(NOT WIN32 AND NOT CYGWIN) 222 # MinGW warns if -fvisibility-inlines-hidden is used. 223 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 224 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) 225endif() 226 227if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 228 # TODO: support other platforms and toolchains. 229 if( LLVM_BUILD_32_BITS ) 230 message(STATUS "Building 32 bits executables and libraries.") 231 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32") 232 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32") 233 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32") 234 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32") 235 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32") 236 237 # FIXME: CMAKE_SIZEOF_VOID_P is still 8 238 add_definitions(-D_LARGEFILE_SOURCE) 239 add_definitions(-D_FILE_OFFSET_BITS=64) 240 endif( LLVM_BUILD_32_BITS ) 241endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 242 243# If building on a GNU specific 32-bit system, make sure off_t is 64 bits 244# so that off_t can stored offset > 2GB. 245# Android until version N (API 24) doesn't support it. 246if (ANDROID AND (ANDROID_NATIVE_API_LEVEL LESS 24)) 247 set(LLVM_FORCE_SMALLFILE_FOR_ANDROID TRUE) 248endif() 249if( CMAKE_SIZEOF_VOID_P EQUAL 4 AND NOT LLVM_FORCE_SMALLFILE_FOR_ANDROID) 250 # FIXME: It isn't handled in LLVM_BUILD_32_BITS. 251 add_definitions( -D_LARGEFILE_SOURCE ) 252 add_definitions( -D_FILE_OFFSET_BITS=64 ) 253endif() 254 255if( XCODE ) 256 # For Xcode enable several build settings that correspond to 257 # many warnings that are on by default in Clang but are 258 # not enabled for historical reasons. For versions of Xcode 259 # that do not support these options they will simply 260 # be ignored. 261 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES") 262 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES") 263 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES") 264 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES") 265 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES") 266 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES") 267 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES") 268 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES") 269 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES") 270 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES") 271 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES") 272 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES") 273 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES") 274 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES") 275 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES") 276endif() 277 278# On Win32 using MS tools, provide an option to set the number of parallel jobs 279# to use. 280if( MSVC_IDE ) 281 set(LLVM_COMPILER_JOBS "0" CACHE STRING 282 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 283 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 284 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 285 add_definitions( /MP ) 286 else() 287 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 288 add_definitions( /MP${LLVM_COMPILER_JOBS} ) 289 endif() 290 else() 291 message(STATUS "Parallel compilation disabled") 292 endif() 293endif() 294 295# set stack reserved size to ~10MB 296if(MSVC) 297 # CMake previously automatically set this value for MSVC builds, but the 298 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default 299 # value (1 MB) which is not enough for us in tasks such as parsing recursive 300 # C++ templates in Clang. 301 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000") 302elseif(MINGW) # FIXME: Also cygwin? 303 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216") 304 305 # Pass -mbig-obj to mingw gas on Win64. COFF has a 2**16 section limit, and 306 # on Win64, every COMDAT function creates at least 3 sections: .text, .pdata, 307 # and .xdata. 308 if (CMAKE_SIZEOF_VOID_P EQUAL 8) 309 append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 310 endif() 311endif() 312 313if( MSVC ) 314 if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0 ) 315 # For MSVC 2013, disable iterator null pointer checking in debug mode, 316 # especially so std::equal(nullptr, nullptr, nullptr) will not assert. 317 add_definitions("-D_DEBUG_POINTER_IMPL=") 318 endif() 319 320 include(ChooseMSVCCRT) 321 322 if( MSVC11 ) 323 add_definitions(-D_VARIADIC_MAX=10) 324 endif() 325 326 # Add definitions that make MSVC much less annoying. 327 add_definitions( 328 # For some reason MS wants to deprecate a bunch of standard functions... 329 -D_CRT_SECURE_NO_DEPRECATE 330 -D_CRT_SECURE_NO_WARNINGS 331 -D_CRT_NONSTDC_NO_DEPRECATE 332 -D_CRT_NONSTDC_NO_WARNINGS 333 -D_SCL_SECURE_NO_DEPRECATE 334 -D_SCL_SECURE_NO_WARNINGS 335 ) 336 337 # Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI. 338 add_definitions( 339 -DUNICODE 340 -D_UNICODE 341 ) 342 343 if (LLVM_ENABLE_WERROR) 344 append("/WX" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 345 endif (LLVM_ENABLE_WERROR) 346 347 append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 348 349 # Allow users to request PDBs in release mode. CMake offeres the 350 # RelWithDebInfo configuration, but it uses different optimization settings 351 # (/Ob1 vs /Ob2 or -O2 vs -O3). LLVM provides this flag so that users can get 352 # PDBs without changing codegen. 353 option(LLVM_ENABLE_PDB OFF) 354 if (LLVM_ENABLE_PDB AND uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE") 355 append("/Zi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 356 # /DEBUG disables linker GC and ICF, but we want those in Release mode. 357 append("/DEBUG /OPT:REF /OPT:ICF" 358 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS 359 CMAKE_SHARED_LINKER_FLAGS) 360 endif() 361 362 # /Zc:strictStrings is incompatible with VS12's (Visual Studio 2013's) 363 # debug mode headers. Instead of only enabling them in VS2013's debug mode, 364 # we'll just enable them for Visual Studio 2015 (VS 14, MSVC_VERSION 1900) 365 # and up. 366 if (NOT (MSVC_VERSION LESS 1900)) 367 # Disable string literal const->non-const type conversion. 368 # "When specified, the compiler requires strict const-qualification 369 # conformance for pointers initialized by using string literals." 370 append("/Zc:strictStrings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 371 endif(NOT (MSVC_VERSION LESS 1900)) 372 373 # "Generate Intrinsic Functions". 374 append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 375 376 # "Enforce type conversion rules". 377 append("/Zc:rvalueCast" CMAKE_CXX_FLAGS) 378 379 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO) 380 # clang-cl and cl by default produce non-deterministic binaries because 381 # link.exe /incremental requires a timestamp in the .obj file. clang-cl 382 # has the flag /Brepro to force deterministic binaries. We want to pass that 383 # whenever you're building with clang unless you're passing /incremental 384 # or using LTO (/Brepro with LTO would result in a warning about the flag 385 # being unused, because we're not generating object files). 386 # This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag() 387 # because cl.exe does not emit an error on flags it doesn't understand, 388 # letting check_cxx_compiler_flag() claim it understands all flags. 389 check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO) 390 if (SUPPORTS_BREPRO) 391 # Check if /INCREMENTAL is passed to the linker and complain that it 392 # won't work with /Brepro. 393 string(TOUPPER "${CMAKE_EXE_LINKER_FLAGS}" upper_exe_flags) 394 string(TOUPPER "${CMAKE_MODULE_LINKER_FLAGS}" upper_module_flags) 395 string(TOUPPER "${CMAKE_SHARED_LINKER_FLAGS}" upper_shared_flags) 396 397 string(FIND "${upper_exe_flags} ${upper_module_flags} ${upper_shared_flags}" 398 "/INCREMENTAL" linker_flag_idx) 399 400 if (${linker_flag_idx} GREATER -1) 401 message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic") 402 else() 403 append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 404 endif() 405 endif() 406 endif() 407 408elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 409 append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 410 append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS) 411 add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME) 412 add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW) 413 if (LLVM_ENABLE_CXX1Y) 414 check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y) 415 append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" CMAKE_CXX_FLAGS) 416 elseif(LLVM_ENABLE_CXX1Z) 417 check_cxx_compiler_flag("-std=c++1z" CXX_SUPPORTS_CXX1Z) 418 append_if(CXX_SUPPORTS_CXX1Z "-std=c++1z" CMAKE_CXX_FLAGS) 419 else() 420 check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11) 421 if (CXX_SUPPORTS_CXX11) 422 if (CYGWIN OR MINGW) 423 # MinGW and Cygwin are a bit stricter and lack things like 424 # 'strdup', 'stricmp', etc in c++11 mode. 425 append("-std=gnu++11" CMAKE_CXX_FLAGS) 426 else() 427 append("-std=c++11" CMAKE_CXX_FLAGS) 428 endif() 429 else() 430 message(FATAL_ERROR "LLVM requires C++11 support but the '-std=c++11' flag isn't supported.") 431 endif() 432 endif() 433 if (LLVM_ENABLE_MODULES) 434 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 435 set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache") 436 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin") 437 # On Darwin -fmodules does not imply -fcxx-modules. 438 set(module_flags "${module_flags} -fcxx-modules") 439 endif() 440 if (LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY) 441 set(module_flags "${module_flags} -Xclang -fmodules-local-submodule-visibility") 442 endif() 443 if (LLVM_ENABLE_MODULE_DEBUGGING AND 444 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR 445 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO"))) 446 set(module_flags "${module_flags} -gmodules") 447 endif() 448 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${module_flags}") 449 450 # Check that we can build code with modules enabled, and that repeatedly 451 # including <cassert> still manages to respect NDEBUG properly. 452 CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG 453 #include <cassert> 454 #define NDEBUG 455 #include <cassert> 456 int main() { assert(this code is not compiled); }" 457 CXX_SUPPORTS_MODULES) 458 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 459 if (CXX_SUPPORTS_MODULES) 460 append("${module_flags}" CMAKE_CXX_FLAGS) 461 else() 462 message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler") 463 endif() 464 endif(LLVM_ENABLE_MODULES) 465endif( MSVC ) 466 467if (MSVC) 468 if (NOT CLANG_CL) 469 set(msvc_warning_flags 470 # Disabled warnings. 471 -wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline) 472 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 473 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored' 474 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 475 -wd4258 # Suppress ''var' : definition from the for loop is ignored; the definition from the enclosing scope is used' 476 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 477 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' 478 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized' 479 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 480 -wd4355 # Suppress ''this' : used in base member initializer list' 481 -wd4456 # Suppress 'declaration of 'var' hides local variable' 482 -wd4457 # Suppress 'declaration of 'var' hides function parameter' 483 -wd4458 # Suppress 'declaration of 'var' hides class member' 484 -wd4459 # Suppress 'declaration of 'var' hides global declaration' 485 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 486 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 487 -wd4722 # Suppress 'function' : destructor never returns, potential memory leak 488 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)' 489 -wd4100 # Suppress 'unreferenced formal parameter' 490 -wd4127 # Suppress 'conditional expression is constant' 491 -wd4512 # Suppress 'assignment operator could not be generated' 492 -wd4505 # Suppress 'unreferenced local function has been removed' 493 -wd4610 # Suppress '<class> can never be instantiated' 494 -wd4510 # Suppress 'default constructor could not be generated' 495 -wd4702 # Suppress 'unreachable code' 496 -wd4245 # Suppress 'signed/unsigned mismatch' 497 -wd4706 # Suppress 'assignment within conditional expression' 498 -wd4310 # Suppress 'cast truncates constant value' 499 -wd4701 # Suppress 'potentially uninitialized local variable' 500 -wd4703 # Suppress 'potentially uninitialized local pointer variable' 501 -wd4389 # Suppress 'signed/unsigned mismatch' 502 -wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable' 503 -wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation' 504 -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer' 505 -wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed' 506 -wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared' 507 # C4592 is disabled because of false positives in Visual Studio 2015 508 # Update 1. Re-evaluate the usefulness of this diagnostic with Update 2. 509 -wd4592 # Suppress ''var': symbol will be dynamically initialized (implementation limitation) 510 -wd4319 # Suppress ''operator' : zero extending 'type' to 'type' of greater size' 511 512 # Ideally, we'd like this warning to be enabled, but MSVC 2013 doesn't 513 # support the 'aligned' attribute in the way that clang sources requires (for 514 # any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to 515 # avoid unwanted alignment warnings. 516 # When we switch to requiring a version of MSVC that supports the 'alignas' 517 # specifier (MSVC 2015?) this warning can be re-enabled. 518 -wd4324 # Suppress 'structure was padded due to __declspec(align())' 519 520 # Promoted warnings. 521 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 522 523 # Promoted warnings to errors. 524 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 525 ) 526 endif(NOT CLANG_CL) 527 528 # Enable warnings 529 if (LLVM_ENABLE_WARNINGS) 530 # Put /W4 in front of all the -we flags. cl.exe doesn't care, but for 531 # clang-cl having /W4 after the -we flags will re-enable the warnings 532 # disabled by -we. 533 set(msvc_warning_flags "/W4 ${msvc_warning_flags}") 534 # CMake appends /W3 by default, and having /W3 followed by /W4 will result in 535 # cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is 536 # a command line warning and not a compiler warning, it cannot be suppressed except 537 # by fixing the command line. 538 string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") 539 string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 540 541 if (LLVM_ENABLE_PEDANTIC) 542 # No MSVC equivalent available 543 endif (LLVM_ENABLE_PEDANTIC) 544 endif (LLVM_ENABLE_WARNINGS) 545 546 foreach(flag ${msvc_warning_flags}) 547 append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 548 endforeach(flag) 549endif (MSVC) 550 551if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 552 553 # Don't add -Wall for clang-cl, because it maps -Wall to -Weverything for 554 # MSVC compatibility. /W4 is added above instead. 555 if (NOT CLANG_CL) 556 append("-Wall" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 557 endif() 558 559 append("-Wextra -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 560 append("-Wcast-qual" CMAKE_CXX_FLAGS) 561 562 # Turn off missing field initializer warnings for gcc to avoid noise from 563 # false positives with empty {}. Turn them on otherwise (they're off by 564 # default for clang). 565 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 566 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 567 if (CMAKE_COMPILER_IS_GNUCXX) 568 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 569 else() 570 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 571 endif() 572 endif() 573 574 if (LLVM_ENABLE_PEDANTIC AND LLVM_COMPILER_IS_GCC_COMPATIBLE) 575 append("-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 576 append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 577 endif() 578 579 add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG) 580 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS) 581 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS) 582 583 # Disable -Wclass-memaccess, a C++-only warning from GCC 8 that fires on 584 # LLVM's ADT classes. 585 check_cxx_compiler_flag("-Wclass-memaccess" CXX_SUPPORTS_CLASS_MEMACCESS_FLAG) 586 append_if(CXX_SUPPORTS_CLASS_MEMACCESS_FLAG "-Wno-class-memaccess" CMAKE_CXX_FLAGS) 587 588 # Check if -Wnon-virtual-dtor warns even though the class is marked final. 589 # If it does, don't add it. So it won't be added on clang 3.4 and older. 590 # This also catches cases when -Wnon-virtual-dtor isn't supported by 591 # the compiler at all. This flag is not activated for gcc since it will 592 # incorrectly identify a protected non-virtual base when there is a friend 593 # declaration. Don't activate this in general on Windows as this warning has 594 # too many false positives on COM-style classes, which are destroyed with 595 # Release() (PR32286). 596 if (NOT CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32) 597 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 598 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11 -Werror=non-virtual-dtor") 599 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();protected: ~base();}; 600 class derived final : public base { public: ~derived();}; 601 int main() { return 0; }" 602 CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR) 603 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 604 append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR 605 "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS) 606 endif() 607 608 # Enable -Wdelete-non-virtual-dtor if available. 609 add_flag_if_supported("-Wdelete-non-virtual-dtor" DELETE_NON_VIRTUAL_DTOR_FLAG) 610 611 # Check if -Wcomment is OK with an // comment ending with '\' if the next 612 # line is also a // comment. 613 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 614 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment") 615 CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main() {return 0;}" 616 C_WCOMMENT_ALLOWS_LINE_WRAP) 617 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 618 if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP) 619 append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 620 endif() 621 622 # Enable -Wstring-conversion to catch misuse of string literals. 623 add_flag_if_supported("-Wstring-conversion" STRING_CONVERSION_FLAG) 624endif (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL)) 625 626if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT LLVM_ENABLE_WARNINGS) 627 append("-w" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 628endif() 629 630macro(append_common_sanitizer_flags) 631 if (NOT MSVC) 632 # Append -fno-omit-frame-pointer and turn on debug info to get better 633 # stack traces. 634 add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER) 635 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 636 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 637 add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY) 638 endif() 639 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large. 640 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND LLVM_OPTIMIZE_SANITIZED_BUILDS) 641 add_flag_if_supported("-O1" O1) 642 endif() 643 elseif (CLANG_CL) 644 # Keep frame pointers around. 645 append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 646 if (LINKER_IS_LLD_LINK) 647 # Use DWARF debug info with LLD. 648 append("-gdwarf" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 649 else() 650 # Enable codeview otherwise. 651 append("/Z7" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 652 endif() 653 # Always ask the linker to produce symbols with asan. 654 append("-debug" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 655 endif() 656endmacro() 657 658# Turn on sanitizers if necessary. 659if(LLVM_USE_SANITIZER) 660 if (LLVM_ON_UNIX) 661 if (LLVM_USE_SANITIZER STREQUAL "Address") 662 append_common_sanitizer_flags() 663 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 664 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 665 append_common_sanitizer_flags() 666 append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 667 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 668 append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 669 endif() 670 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 671 append_common_sanitizer_flags() 672 append("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all" 673 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 674 elseif (LLVM_USE_SANITIZER STREQUAL "Thread") 675 append_common_sanitizer_flags() 676 append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 677 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 678 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 679 append_common_sanitizer_flags() 680 append("-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all" 681 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 682 elseif (LLVM_USE_SANITIZER STREQUAL "Leaks") 683 append_common_sanitizer_flags() 684 append("-fsanitize=leak" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 685 else() 686 message(FATAL_ERROR "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 687 endif() 688 elseif(MSVC) 689 if (LLVM_USE_SANITIZER STREQUAL "Address") 690 append_common_sanitizer_flags() 691 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 692 else() 693 message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}") 694 endif() 695 else() 696 message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.") 697 endif() 698 if (LLVM_USE_SANITIZER MATCHES "(Undefined;)?Address(;Undefined)?") 699 add_flag_if_supported("-fsanitize-address-use-after-scope" 700 FSANITIZE_USE_AFTER_SCOPE_FLAG) 701 endif() 702 if (LLVM_USE_SANITIZE_COVERAGE) 703 append("-fsanitize=fuzzer-no-link" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 704 endif() 705 if (LLVM_USE_SANITIZER MATCHES ".*Undefined.*") 706 set(BLACKLIST_FILE "${CMAKE_SOURCE_DIR}/utils/sanitizers/ubsan_blacklist.txt") 707 if (EXISTS "${BLACKLIST_FILE}") 708 append("-fsanitize-blacklist=${BLACKLIST_FILE}" 709 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 710 endif() 711 endif() 712endif() 713 714# Turn on -gsplit-dwarf if requested 715if(LLVM_USE_SPLIT_DWARF) 716 add_definitions("-gsplit-dwarf") 717endif() 718 719add_definitions( -D__STDC_CONSTANT_MACROS ) 720add_definitions( -D__STDC_FORMAT_MACROS ) 721add_definitions( -D__STDC_LIMIT_MACROS ) 722 723# clang and gcc don't default-print colored diagnostics when invoked from Ninja. 724if (UNIX AND 725 CMAKE_GENERATOR STREQUAL "Ninja" AND 726 (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR 727 (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND 728 NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)))) 729 append("-fdiagnostics-color" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 730endif() 731 732# lld doesn't print colored diagnostics when invoked from Ninja 733if (UNIX AND CMAKE_GENERATOR STREQUAL "Ninja") 734 include(CheckLinkerFlag) 735 check_linker_flag("-Wl,--color-diagnostics" LINKER_SUPPORTS_COLOR_DIAGNOSTICS) 736 append_if(LINKER_SUPPORTS_COLOR_DIAGNOSTICS "-Wl,--color-diagnostics" 737 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 738endif() 739 740# Add flags for add_dead_strip(). 741# FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF? 742# But MinSizeRel seems to add that automatically, so maybe disable these 743# flags instead if LLVM_NO_DEAD_STRIP is set. 744if(NOT CYGWIN AND NOT WIN32) 745 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND 746 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 747 check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS) 748 if (C_SUPPORTS_FNO_FUNCTION_SECTIONS) 749 # Don't add -ffunction-section if it can be disabled with -fno-function-sections. 750 # Doing so will break sanitizers. 751 add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS) 752 endif() 753 add_flag_if_supported("-fdata-sections" FDATA_SECTIONS) 754 endif() 755endif() 756 757if(MSVC) 758 # Remove flags here, for exceptions and RTTI. 759 # Each target property or source property should be responsible to control 760 # them. 761 # CL.EXE complains to override flags like "/GR /GR-". 762 string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 763 string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 764endif() 765 766# Provide public options to globally control RTTI and EH 767option(LLVM_ENABLE_EH "Enable Exception handling" OFF) 768option(LLVM_ENABLE_RTTI "Enable run time type information" OFF) 769if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI) 770 message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON") 771endif() 772 773option(LLVM_ENABLE_IR_PGO "Build LLVM and tools with IR PGO instrumentation (deprecated)" Off) 774mark_as_advanced(LLVM_ENABLE_IR_PGO) 775 776set(LLVM_BUILD_INSTRUMENTED OFF CACHE STRING "Build LLVM and tools with PGO instrumentation. May be specified as IR or Frontend") 777mark_as_advanced(LLVM_BUILD_INSTRUMENTED) 778string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED) 779 780if (LLVM_BUILD_INSTRUMENTED) 781 if (LLVM_ENABLE_IR_PGO OR uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "IR") 782 append("-fprofile-generate='${LLVM_PROFILE_DATA_DIR}'" 783 CMAKE_CXX_FLAGS 784 CMAKE_C_FLAGS 785 CMAKE_EXE_LINKER_FLAGS 786 CMAKE_SHARED_LINKER_FLAGS) 787 else() 788 append("-fprofile-instr-generate='${LLVM_PROFILE_FILE_PATTERN}'" 789 CMAKE_CXX_FLAGS 790 CMAKE_C_FLAGS 791 CMAKE_EXE_LINKER_FLAGS 792 CMAKE_SHARED_LINKER_FLAGS) 793 endif() 794endif() 795 796option(LLVM_BUILD_INSTRUMENTED_COVERAGE "Build LLVM and tools with Code Coverage instrumentation" Off) 797mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE) 798append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate='${LLVM_PROFILE_FILE_PATTERN}' -fcoverage-mapping" 799 CMAKE_CXX_FLAGS 800 CMAKE_C_FLAGS 801 CMAKE_EXE_LINKER_FLAGS 802 CMAKE_SHARED_LINKER_FLAGS) 803 804if (LLVM_BUILD_INSTRUMENTED AND LLVM_BUILD_INSTRUMENTED_COVERAGE) 805 message(FATAL_ERROR "LLVM_BUILD_INSTRUMENTED and LLVM_BUILD_INSTRUMENTED_COVERAGE cannot both be specified") 806endif() 807 808if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK) 809 message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)") 810endif() 811if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN") 812 append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 813 if(NOT LINKER_IS_LLD_LINK) 814 append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 815 endif() 816 # If the linker supports it, enable the lto cache. This improves initial build 817 # time a little since we re-link a lot of the same objects, and significantly 818 # improves incremental build time. 819 # FIXME: We should move all this logic into the clang driver. 820 if(APPLE) 821 append("-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache" 822 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 823 elseif(UNIX AND LLVM_USE_LINKER STREQUAL "lld") 824 append("-Wl,--thinlto-cache-dir=${PROJECT_BINARY_DIR}/lto.cache" 825 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 826 elseif(LLVM_USE_LINKER STREQUAL "gold") 827 append("-Wl,--plugin-opt,cache-dir=${PROJECT_BINARY_DIR}/lto.cache" 828 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 829 endif() 830elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL") 831 append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 832 if(NOT LINKER_IS_LLD_LINK) 833 append("-flto=full" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 834 endif() 835elseif(LLVM_ENABLE_LTO) 836 append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS) 837 if(NOT LINKER_IS_LLD_LINK) 838 append("-flto" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS) 839 endif() 840endif() 841 842# This option makes utils/extract_symbols.py be used to determine the list of 843# symbols to export from LLVM tools. This is necessary when using MSVC if you 844# want to allow plugins, though note that the plugin has to explicitly link 845# against (exactly one) tool so we can't unilaterally turn on 846# LLVM_ENABLE_PLUGINS when it's enabled. 847option(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS "Export symbols from LLVM tools so that plugins can import them" OFF) 848if(BUILD_SHARED_LIBS AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 849 message(FATAL_ERROR "BUILD_SHARED_LIBS not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 850endif() 851if(LLVM_LINK_LLVM_DYLIB AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS) 852 message(FATAL_ERROR "LLVM_LINK_LLVM_DYLIB not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS") 853endif() 854 855# Plugin support 856# FIXME: Make this configurable. 857if(WIN32 OR CYGWIN) 858 if(BUILD_SHARED_LIBS OR LLVM_BUILD_LLVM_DYLIB) 859 set(LLVM_ENABLE_PLUGINS ON) 860 else() 861 set(LLVM_ENABLE_PLUGINS OFF) 862 endif() 863else() 864 set(LLVM_ENABLE_PLUGINS ON) 865endif() 866 867set(LLVM_ENABLE_IDE_default OFF) 868if (XCODE OR MSVC_IDE OR CMAKE_EXTRA_GENERATOR) 869 set(LLVM_ENABLE_IDE_default ON) 870endif() 871option(LLVM_ENABLE_IDE "Generate targets and process sources for use with an IDE" 872 ${LLVM_ENABLE_IDE_default}) 873 874function(get_compile_definitions) 875 get_directory_property(top_dir_definitions DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS) 876 foreach(definition ${top_dir_definitions}) 877 if(DEFINED result) 878 string(APPEND result " -D${definition}") 879 else() 880 set(result "-D${definition}") 881 endif() 882 endforeach() 883 set(LLVM_DEFINITIONS "${result}" PARENT_SCOPE) 884endfunction() 885get_compile_definitions() 886 887option(LLVM_FORCE_ENABLE_STATS "Enable statistics collection for builds that wouldn't normally enable it" OFF) 888