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(HandleLLVMStdlib) 10include(AddLLVMDefinitions) 11include(CheckCCompilerFlag) 12include(CheckCXXCompilerFlag) 13 14if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN) 15 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU") 16 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7) 17 message(FATAL_ERROR "Host GCC version must be at least 4.7!") 18 endif() 19 elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang") 20 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1) 21 message(FATAL_ERROR "Host Clang version must be at least 3.1!") 22 endif() 23 24 if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC") 25 if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS 18.0) 26 message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=18.0") 27 endif() 28 set(CLANG_CL 1) 29 elseif(NOT LLVM_ENABLE_LIBCXX) 30 # Otherwise, test that we aren't using too old of a version of libstdc++ 31 # with the Clang compiler. This is tricky as there is no real way to 32 # check the version of libstdc++ directly. Instead we test for a known 33 # bug in libstdc++4.6 that is fixed in libstdc++4.7. 34 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 35 set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}) 36 set(CMAKE_REQUIRED_FLAGS "-std=c++0x") 37 check_cxx_source_compiles(" 38#include <atomic> 39std::atomic<float> x(0.0f); 40int main() { return (float)x; }" 41 LLVM_NO_OLD_LIBSTDCXX) 42 if(NOT LLVM_NO_OLD_LIBSTDCXX) 43 message(FATAL_ERROR "Host Clang must be able to find libstdc++4.7 or newer!") 44 endif() 45 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 46 set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES}) 47 endif() 48 elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC") 49 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0) 50 message(FATAL_ERROR "Host Visual Studio must be at least 2013") 51 elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0.31101) 52 message(WARNING "Host Visual Studio should at least be 2013 Update 4 (MSVC 18.0.31101)" 53 " due to miscompiles from earlier versions") 54 endif() 55 endif() 56endif() 57 58if( LLVM_ENABLE_ASSERTIONS ) 59 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 60 if( NOT MSVC ) 61 add_definitions( -D_DEBUG ) 62 endif() 63 # On non-Debug builds cmake automatically defines NDEBUG, so we 64 # explicitly undefine it: 65 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" ) 66 add_definitions( -UNDEBUG ) 67 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines. 68 foreach (flags_var_to_scrub 69 CMAKE_CXX_FLAGS_RELEASE 70 CMAKE_CXX_FLAGS_RELWITHDEBINFO 71 CMAKE_CXX_FLAGS_MINSIZEREL 72 CMAKE_C_FLAGS_RELEASE 73 CMAKE_C_FLAGS_RELWITHDEBINFO 74 CMAKE_C_FLAGS_MINSIZEREL) 75 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " " 76 "${flags_var_to_scrub}" "${${flags_var_to_scrub}}") 77 endforeach() 78 endif() 79endif() 80 81string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS) 82 83if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" ) 84 if( LLVM_ENABLE_ASSERTIONS ) 85 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 86 endif() 87elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" ) 88 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 ) 89elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" ) 90 # We don't need to do anything special to turn off ABI breaking checks. 91else() 92 message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!") 93endif() 94 95if(WIN32) 96 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 97 if(CYGWIN) 98 set(LLVM_ON_WIN32 0) 99 set(LLVM_ON_UNIX 1) 100 else(CYGWIN) 101 set(LLVM_ON_WIN32 1) 102 set(LLVM_ON_UNIX 0) 103 endif(CYGWIN) 104else(WIN32) 105 if(UNIX) 106 set(LLVM_ON_WIN32 0) 107 set(LLVM_ON_UNIX 1) 108 if(APPLE) 109 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0) 110 else(APPLE) 111 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1) 112 endif(APPLE) 113 else(UNIX) 114 MESSAGE(SEND_ERROR "Unable to determine platform") 115 endif(UNIX) 116endif(WIN32) 117 118set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX}) 119set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 120 121# We use *.dylib rather than *.so on darwin. 122set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX}) 123 124if(APPLE) 125 # Darwin-specific linker flags for loadable modules. 126 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress") 127endif() 128 129# Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO 130# build might work on ELF but fail on MachO/COFF. 131if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32 OR 132 ${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD") AND 133 NOT LLVM_USE_SANITIZER) 134 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs") 135endif() 136 137 138function(append value) 139 foreach(variable ${ARGN}) 140 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 141 endforeach(variable) 142endfunction() 143 144function(append_if condition value) 145 if (${condition}) 146 foreach(variable ${ARGN}) 147 set(${variable} "${${variable}} ${value}" PARENT_SCOPE) 148 endforeach(variable) 149 endif() 150endfunction() 151 152macro(add_flag_if_supported flag name) 153 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 154 append_if("C_SUPPORTS_${name}" "${flag}" CMAKE_C_FLAGS) 155 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 156 append_if("CXX_SUPPORTS_${name}" "${flag}" CMAKE_CXX_FLAGS) 157endmacro() 158 159function(add_flag_or_print_warning flag name) 160 check_c_compiler_flag("-Werror ${flag}" "C_SUPPORTS_${name}") 161 check_cxx_compiler_flag("-Werror ${flag}" "CXX_SUPPORTS_${name}") 162 if (C_SUPPORTS_${name} AND CXX_SUPPORTS_${name}) 163 message(STATUS "Building with ${flag}") 164 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE) 165 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE) 166 else() 167 message(WARNING "${flag} is not supported.") 168 endif() 169endfunction() 170 171if( LLVM_ENABLE_PIC ) 172 if( XCODE ) 173 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't 174 # know how to disable this, so just force ENABLE_PIC off for now. 175 message(WARNING "-fPIC not supported with Xcode.") 176 elseif( WIN32 OR CYGWIN) 177 # On Windows all code is PIC. MinGW warns if -fPIC is used. 178 else() 179 add_flag_or_print_warning("-fPIC" FPIC) 180 181 if( WIN32 OR CYGWIN) 182 # MinGW warns if -fvisibility-inlines-hidden is used. 183 else() 184 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG) 185 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS) 186 endif() 187 endif() 188endif() 189 190if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 191 # TODO: support other platforms and toolchains. 192 if( LLVM_BUILD_32_BITS ) 193 message(STATUS "Building 32 bits executables and libraries.") 194 add_llvm_definitions( -m32 ) 195 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32") 196 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32") 197 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32") 198 endif( LLVM_BUILD_32_BITS ) 199endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 ) 200 201if (LLVM_BUILD_STATIC) 202 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static") 203endif() 204 205if( XCODE ) 206 # For Xcode enable several build settings that correspond to 207 # many warnings that are on by default in Clang but are 208 # not enabled for historical reasons. For versions of Xcode 209 # that do not support these options they will simply 210 # be ignored. 211 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES") 212 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES") 213 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES") 214 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES") 215 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES") 216 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES") 217 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES") 218 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES") 219 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES") 220 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES") 221 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES") 222 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES") 223 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES") 224 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES") 225 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES") 226endif() 227 228# On Win32 using MS tools, provide an option to set the number of parallel jobs 229# to use. 230if( MSVC_IDE ) 231 set(LLVM_COMPILER_JOBS "0" CACHE STRING 232 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.") 233 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" ) 234 if( LLVM_COMPILER_JOBS STREQUAL "0" ) 235 add_llvm_definitions( /MP ) 236 else() 237 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS}) 238 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} ) 239 endif() 240 else() 241 message(STATUS "Parallel compilation disabled") 242 endif() 243endif() 244 245if( MSVC ) 246 include(ChooseMSVCCRT) 247 248 if( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) ) 249 # set stack reserved size to ~10MB 250 # CMake previously automatically set this value for MSVC builds, but the 251 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default 252 # value (1 MB) which is not enough for us in tasks such as parsing recursive 253 # C++ templates in Clang. 254 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000") 255 endif() 256 257 if( MSVC11 ) 258 add_llvm_definitions(-D_VARIADIC_MAX=10) 259 endif() 260 261 # Add definitions that make MSVC much less annoying. 262 add_llvm_definitions( 263 # For some reason MS wants to deprecate a bunch of standard functions... 264 -D_CRT_SECURE_NO_DEPRECATE 265 -D_CRT_SECURE_NO_WARNINGS 266 -D_CRT_NONSTDC_NO_DEPRECATE 267 -D_CRT_NONSTDC_NO_WARNINGS 268 -D_SCL_SECURE_NO_DEPRECATE 269 -D_SCL_SECURE_NO_WARNINGS 270 ) 271 272 set(msvc_warning_flags 273 # Disabled warnings. 274 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned' 275 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored' 276 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data' 277 -wd4258 # Suppress ''var' : definition from the for loop is ignored; the definition from the enclosing scope is used' 278 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data' 279 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception' 280 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized' 281 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized' 282 -wd4355 # Suppress ''this' : used in base member initializer list' 283 -wd4456 # Suppress 'declaration of 'var' hides local variable' 284 -wd4457 # Suppress 'declaration of 'var' hides function parameter' 285 -wd4458 # Suppress 'declaration of 'var' hides class member' 286 -wd4459 # Suppress 'declaration of 'var' hides global declaration' 287 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated' 288 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible' 289 -wd4722 # Suppress 'function' : destructor never returns, potential memory leak 290 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)' 291 -wd4100 # Suppress 'unreferenced formal parameter' 292 -wd4127 # Suppress 'conditional expression is constant' 293 -wd4512 # Suppress 'assignment operator could not be generated' 294 -wd4505 # Suppress 'unreferenced local function has been removed' 295 -wd4610 # Suppress '<class> can never be instantiated' 296 -wd4510 # Suppress 'default constructor could not be generated' 297 -wd4702 # Suppress 'unreachable code' 298 -wd4245 # Suppress 'signed/unsigned mismatch' 299 -wd4706 # Suppress 'assignment within conditional expression' 300 -wd4310 # Suppress 'cast truncates constant value' 301 -wd4701 # Suppress 'potentially uninitialized local variable' 302 -wd4703 # Suppress 'potentially uninitialized local pointer variable' 303 -wd4389 # Suppress 'signed/unsigned mismatch' 304 -wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable' 305 -wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation' 306 -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer' 307 308 # Promoted warnings. 309 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning. 310 311 # Promoted warnings to errors. 312 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error. 313 ) 314 315 # Enable warnings 316 if (LLVM_ENABLE_WARNINGS) 317 append("/W4" msvc_warning_flags) 318 # CMake appends /W3 by default, and having /W3 followed by /W4 will result in 319 # cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is 320 # a command line warning and not a compiler warning, it cannot be suppressed except 321 # by fixing the command line. 322 string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") 323 string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 324 325 if (LLVM_ENABLE_PEDANTIC) 326 # No MSVC equivalent available 327 endif (LLVM_ENABLE_PEDANTIC) 328 endif (LLVM_ENABLE_WARNINGS) 329 if (LLVM_ENABLE_WERROR) 330 append("/WX" msvc_warning_flags) 331 endif (LLVM_ENABLE_WERROR) 332 333 foreach(flag ${msvc_warning_flags}) 334 append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 335 endforeach(flag) 336 337elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE ) 338 if (LLVM_ENABLE_WARNINGS) 339 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 340 append("-Wcast-qual" CMAKE_CXX_FLAGS) 341 342 # Turn off missing field initializer warnings for gcc to avoid noise from 343 # false positives with empty {}. Turn them on otherwise (they're off by 344 # default for clang). 345 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 346 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG) 347 if (CMAKE_COMPILER_IS_GNUCXX) 348 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 349 else() 350 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 351 endif() 352 endif() 353 354 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 355 add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG) 356 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS) 357 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS) 358 359 # Check if -Wnon-virtual-dtor warns even though the class is marked final. 360 # If it does, don't add it. So it won't be added on clang 3.4 and older. 361 # This also catches cases when -Wnon-virtual-dtor isn't supported by 362 # the compiler at all. 363 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 364 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11 -Werror=non-virtual-dtor") 365 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();protected: ~base();}; 366 class derived final : public base { public: ~derived();}; 367 int main() { return 0; }" 368 CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR) 369 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 370 append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR 371 "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS) 372 373 # Check if -Wcomment is OK with an // comment ending with '\' if the next 374 # line is also a // comment. 375 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS}) 376 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment") 377 CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main() {return 0;}" 378 C_WCOMMENT_ALLOWS_LINE_WRAP) 379 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 380 if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP) 381 append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 382 endif() 383 endif (LLVM_ENABLE_WARNINGS) 384 append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 385 if (NOT LLVM_ENABLE_TIMESTAMPS) 386 add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME) 387 endif () 388 if (LLVM_ENABLE_CXX1Y) 389 check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y) 390 append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" 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 ${CMAKE_REQUIRED_FLAGS}) 407 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fmodules -fcxx-modules") 408 # Check that we can build code with modules enabled, and that repeatedly 409 # including <cassert> still manages to respect NDEBUG properly. 410 CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG 411 #include <cassert> 412 #define NDEBUG 413 #include <cassert> 414 int main() { assert(this code is not compiled); }" 415 CXX_SUPPORTS_MODULES) 416 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS}) 417 if (CXX_SUPPORTS_MODULES) 418 append_if(CXX_SUPPORTS_MODULES "-fmodules" CMAKE_C_FLAGS) 419 append_if(CXX_SUPPORTS_MODULES "-fmodules -fcxx-modules" CMAKE_CXX_FLAGS) 420 else() 421 message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler") 422 endif() 423 endif(LLVM_ENABLE_MODULES) 424endif( MSVC ) 425 426macro(append_common_sanitizer_flags) 427 # Append -fno-omit-frame-pointer and turn on debug info to get better 428 # stack traces. 429 add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER) 430 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 431 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 432 add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY) 433 endif() 434 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large. 435 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 436 add_flag_if_supported("-O1" O1) 437 endif() 438endmacro() 439 440# Turn on sanitizers if necessary. 441if(LLVM_USE_SANITIZER) 442 if (LLVM_ON_UNIX) 443 if (LLVM_USE_SANITIZER STREQUAL "Address") 444 append_common_sanitizer_flags() 445 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 446 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 447 append_common_sanitizer_flags() 448 append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 449 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 450 append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 451 endif() 452 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 453 append_common_sanitizer_flags() 454 append("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover" 455 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 456 elseif (LLVM_USE_SANITIZER STREQUAL "Thread") 457 append_common_sanitizer_flags() 458 append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 459 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR 460 LLVM_USE_SANITIZER STREQUAL "Undefined;Address") 461 append_common_sanitizer_flags() 462 append("-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover" 463 CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 464 else() 465 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 466 endif() 467 else() 468 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.") 469 endif() 470 if (LLVM_USE_SANITIZE_COVERAGE) 471 append("-fsanitize-coverage=4 -mllvm -sanitizer-coverage-8bit-counters=1" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 472 endif() 473endif() 474 475# Turn on -gsplit-dwarf if requested 476if(LLVM_USE_SPLIT_DWARF) 477 add_definitions("-gsplit-dwarf") 478endif() 479 480add_llvm_definitions( -D__STDC_CONSTANT_MACROS ) 481add_llvm_definitions( -D__STDC_FORMAT_MACROS ) 482add_llvm_definitions( -D__STDC_LIMIT_MACROS ) 483 484# clang doesn't print colored diagnostics when invoked from Ninja 485if (UNIX AND 486 CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND 487 CMAKE_GENERATOR STREQUAL "Ninja") 488 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) 489endif() 490 491# Add flags for add_dead_strip(). 492# FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF? 493# But MinSizeRel seems to add that automatically, so maybe disable these 494# flags instead if LLVM_NO_DEAD_STRIP is set. 495if(NOT CYGWIN AND NOT WIN32) 496 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND 497 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 498 check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS) 499 if (C_SUPPORTS_FNO_FUNCTION_SECTIONS) 500 # Don't add -ffunction-section if it can be disabled with -fno-function-sections. 501 # Doing so will break sanitizers. 502 add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS) 503 endif() 504 add_flag_if_supported("-fdata-sections" FDATA_SECTIONS) 505 endif() 506endif() 507 508if(CYGWIN OR MINGW) 509 # Prune --out-implib from executables. It doesn't make sense even 510 # with --export-all-symbols. 511 string(REGEX REPLACE "-Wl,--out-implib,[^ ]+ " " " 512 CMAKE_C_LINK_EXECUTABLE "${CMAKE_C_LINK_EXECUTABLE}") 513 string(REGEX REPLACE "-Wl,--out-implib,[^ ]+ " " " 514 CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE}") 515endif() 516 517if(MSVC) 518 # Remove flags here, for exceptions and RTTI. 519 # Each target property or source property should be responsible to control 520 # them. 521 # CL.EXE complains to override flags like "/GR /GR-". 522 string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 523 string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 524endif() 525 526# Provide public options to globally control RTTI and EH 527option(LLVM_ENABLE_EH "Enable Exception handling" OFF) 528option(LLVM_ENABLE_RTTI "Enable run time type information" OFF) 529if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI) 530 message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON") 531endif() 532 533# Plugin support 534# FIXME: Make this configurable. 535if(WIN32 OR CYGWIN) 536 if(BUILD_SHARED_LIBS) 537 set(LLVM_ENABLE_PLUGINS ON) 538 else() 539 set(LLVM_ENABLE_PLUGINS OFF) 540 endif() 541else() 542 set(LLVM_ENABLE_PLUGINS ON) 543endif() 544