1 # This CMake module is responsible for interpreting the user defined LLVM_
2 # options and executing the appropriate CMake commands to realize the users'
5 # This is commonly needed so make sure it's defined before we include anything
7 string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
9 include(CheckCompilerVersion)
10 include(HandleLLVMStdlib)
11 include(CheckCCompilerFlag)
12 include(CheckCXXCompilerFlag)
14 if(CMAKE_LINKER MATCHES "lld-link\.exe" OR (WIN32 AND LLVM_USE_LINKER STREQUAL "lld") OR LLVM_ENABLE_LLD)
15 set(LINKER_IS_LLD_LINK TRUE)
17 set(LINKER_IS_LLD_LINK FALSE)
20 set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO")
21 string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO)
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 (Ninja only).")
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.")
31 set_property(GLOBAL APPEND PROPERTY JOB_POOLS compile_job_pool=${LLVM_PARALLEL_COMPILE_JOBS})
32 set(CMAKE_JOB_POOL_COMPILE compile_job_pool)
36 set(LLVM_PARALLEL_LINK_JOBS "" CACHE STRING
37 "Define the maximum number of concurrent link jobs (Ninja only).")
38 if(CMAKE_MAKE_PROGRAM MATCHES "ninja")
39 if(NOT LLVM_PARALLEL_LINK_JOBS AND uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
40 message(STATUS "ThinLTO provides its own parallel linking - limiting parallel link jobs to 2.")
41 set(LLVM_PARALLEL_LINK_JOBS "2")
43 if(LLVM_PARALLEL_LINK_JOBS)
44 set_property(GLOBAL APPEND PROPERTY JOB_POOLS link_job_pool=${LLVM_PARALLEL_LINK_JOBS})
45 set(CMAKE_JOB_POOL_LINK link_job_pool)
47 elseif(LLVM_PARALLEL_LINK_JOBS)
48 message(WARNING "Job pooling is only available with Ninja generators.")
51 if( LLVM_ENABLE_ASSERTIONS )
52 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
54 add_definitions( -D_DEBUG )
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
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}}")
74 if(LLVM_ENABLE_EXPENSIVE_CHECKS)
75 add_definitions(-DEXPENSIVE_CHECKS)
76 add_definitions(-D_GLIBCXX_DEBUG)
79 string(TOUPPER "${LLVM_ABI_BREAKING_CHECKS}" uppercase_LLVM_ABI_BREAKING_CHECKS)
81 if( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "WITH_ASSERTS" )
82 if( LLVM_ENABLE_ASSERTIONS )
83 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )
85 elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_ON" )
86 set( LLVM_ENABLE_ABI_BREAKING_CHECKS 1 )
87 elseif( uppercase_LLVM_ABI_BREAKING_CHECKS STREQUAL "FORCE_OFF" )
88 # We don't need to do anything special to turn off ABI breaking checks.
89 elseif( NOT DEFINED LLVM_ABI_BREAKING_CHECKS )
90 # Treat LLVM_ABI_BREAKING_CHECKS like "FORCE_OFF" when it has not been
93 message(FATAL_ERROR "Unknown value for LLVM_ABI_BREAKING_CHECKS: \"${LLVM_ABI_BREAKING_CHECKS}\"!")
96 if( LLVM_REVERSE_ITERATION )
97 set( LLVM_ENABLE_REVERSE_ITERATION 1 )
101 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
113 if(APPLE OR ${CMAKE_SYSTEM_NAME} MATCHES "AIX")
114 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
116 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
118 else(FUCHSIA OR UNIX)
119 MESSAGE(SEND_ERROR "Unable to determine platform")
120 endif(FUCHSIA OR UNIX)
123 set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX})
124 set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
126 # We use *.dylib rather than *.so on darwin.
127 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
130 if(LLVM_ENABLE_LLD AND LLVM_ENABLE_LTO)
131 message(FATAL_ERROR "lld does not support LTO on Darwin")
133 # Darwin-specific linker flags for loadable modules.
134 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-flat_namespace -Wl,-undefined -Wl,suppress")
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.
139 if(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")
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
150 if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
151 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,nodelete")
152 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-z,nodelete")
156 function(append value)
157 foreach(variable ${ARGN})
158 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
162 function(append_if condition value)
164 foreach(variable ${ARGN})
165 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
170 macro(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)
177 function(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} ${flag}" PARENT_SCOPE)
186 message(WARNING "${flag} is not supported.")
190 if( 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")
194 set(LLVM_USE_LINKER "lld")
197 if( 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}'")
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)
209 if( LLVM_ENABLE_PIC )
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.
217 add_flag_or_print_warning("-fPIC" FPIC)
221 if(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)
227 if(CMAKE_SIZEOF_VOID_P EQUAL 8 AND MINGW)
228 add_definitions( -D_FILE_OFFSET_BITS=64 )
231 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
232 # TODO: support other platforms and toolchains.
233 if( LLVM_BUILD_32_BITS )
234 message(STATUS "Building 32 bits executables and libraries.")
235 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
236 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
237 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
238 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
239 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
241 # FIXME: CMAKE_SIZEOF_VOID_P is still 8
242 add_definitions(-D_LARGEFILE_SOURCE)
243 add_definitions(-D_FILE_OFFSET_BITS=64)
244 endif( LLVM_BUILD_32_BITS )
245 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
247 # If building on a GNU specific 32-bit system, make sure off_t is 64 bits
248 # so that off_t can stored offset > 2GB.
249 # Android until version N (API 24) doesn't support it.
250 if (ANDROID AND (ANDROID_NATIVE_API_LEVEL LESS 24))
251 set(LLVM_FORCE_SMALLFILE_FOR_ANDROID TRUE)
253 if( CMAKE_SIZEOF_VOID_P EQUAL 4 AND NOT LLVM_FORCE_SMALLFILE_FOR_ANDROID)
254 # FIXME: It isn't handled in LLVM_BUILD_32_BITS.
255 add_definitions( -D_LARGEFILE_SOURCE )
256 add_definitions( -D_FILE_OFFSET_BITS=64 )
260 # For Xcode enable several build settings that correspond to
261 # many warnings that are on by default in Clang but are
262 # not enabled for historical reasons. For versions of Xcode
263 # that do not support these options they will simply
265 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_RETURN_TYPE "YES")
266 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_NEWLINE "YES")
267 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VALUE "YES")
268 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_VARIABLE "YES")
269 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_SIGN_COMPARE "YES")
270 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNUSED_FUNCTION "YES")
271 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED "YES")
272 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS "YES")
273 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_UNINITIALIZED_AUTOS "YES")
274 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_BOOL_CONVERSION "YES")
275 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_EMPTY_BODY "YES")
276 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_ENUM_CONVERSION "YES")
277 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_INT_CONVERSION "YES")
278 set(CMAKE_XCODE_ATTRIBUTE_CLANG_WARN_CONSTANT_CONVERSION "YES")
279 set(CMAKE_XCODE_ATTRIBUTE_GCC_WARN_NON_VIRTUAL_DESTRUCTOR "YES")
282 # On Win32 using MS tools, provide an option to set the number of parallel jobs
285 set(LLVM_COMPILER_JOBS "0" CACHE STRING
286 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
287 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
288 if( LLVM_COMPILER_JOBS STREQUAL "0" )
289 add_definitions( /MP )
291 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
292 add_definitions( /MP${LLVM_COMPILER_JOBS} )
295 message(STATUS "Parallel compilation disabled")
299 # set stack reserved size to ~10MB
301 # CMake previously automatically set this value for MSVC builds, but the
302 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default
303 # value (1 MB) which is not enough for us in tasks such as parsing recursive
304 # C++ templates in Clang.
305 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")
306 elseif(MINGW) # FIXME: Also cygwin?
307 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216")
309 # Pass -mbig-obj to mingw gas on Win64. COFF has a 2**16 section limit, and
310 # on Win64, every COMDAT function creates at least 3 sections: .text, .pdata,
312 if (CMAKE_SIZEOF_VOID_P EQUAL 8)
313 append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
318 if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0 )
319 # For MSVC 2013, disable iterator null pointer checking in debug mode,
320 # especially so std::equal(nullptr, nullptr, nullptr) will not assert.
321 add_definitions("-D_DEBUG_POINTER_IMPL=")
324 include(ChooseMSVCCRT)
327 add_definitions(-D_VARIADIC_MAX=10)
330 # Add definitions that make MSVC much less annoying.
332 # For some reason MS wants to deprecate a bunch of standard functions...
333 -D_CRT_SECURE_NO_DEPRECATE
334 -D_CRT_SECURE_NO_WARNINGS
335 -D_CRT_NONSTDC_NO_DEPRECATE
336 -D_CRT_NONSTDC_NO_WARNINGS
337 -D_SCL_SECURE_NO_DEPRECATE
338 -D_SCL_SECURE_NO_WARNINGS
341 # Tell MSVC to use the Unicode version of the Win32 APIs instead of ANSI.
347 if (LLVM_ENABLE_WERROR)
348 append("/WX" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
349 endif (LLVM_ENABLE_WERROR)
351 append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
353 # Allow users to request PDBs in release mode. CMake offeres the
354 # RelWithDebInfo configuration, but it uses different optimization settings
355 # (/Ob1 vs /Ob2 or -O2 vs -O3). LLVM provides this flag so that users can get
356 # PDBs without changing codegen.
357 option(LLVM_ENABLE_PDB OFF)
358 if (LLVM_ENABLE_PDB AND uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE")
359 append("/Zi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
360 # /DEBUG disables linker GC and ICF, but we want those in Release mode.
361 append("/DEBUG /OPT:REF /OPT:ICF"
362 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS
363 CMAKE_SHARED_LINKER_FLAGS)
366 # /Zc:strictStrings is incompatible with VS12's (Visual Studio 2013's)
367 # debug mode headers. Instead of only enabling them in VS2013's debug mode,
368 # we'll just enable them for Visual Studio 2015 (VS 14, MSVC_VERSION 1900)
370 if (NOT (MSVC_VERSION LESS 1900))
371 # Disable string literal const->non-const type conversion.
372 # "When specified, the compiler requires strict const-qualification
373 # conformance for pointers initialized by using string literals."
374 append("/Zc:strictStrings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
375 endif(NOT (MSVC_VERSION LESS 1900))
377 # "Generate Intrinsic Functions".
378 append("/Oi" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
380 # "Enforce type conversion rules".
381 append("/Zc:rvalueCast" CMAKE_CXX_FLAGS)
383 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT LLVM_ENABLE_LTO)
384 # clang-cl and cl by default produce non-deterministic binaries because
385 # link.exe /incremental requires a timestamp in the .obj file. clang-cl
386 # has the flag /Brepro to force deterministic binaries. We want to pass that
387 # whenever you're building with clang unless you're passing /incremental
388 # or using LTO (/Brepro with LTO would result in a warning about the flag
389 # being unused, because we're not generating object files).
390 # This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag()
391 # because cl.exe does not emit an error on flags it doesn't understand,
392 # letting check_cxx_compiler_flag() claim it understands all flags.
393 check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO)
395 # Check if /INCREMENTAL is passed to the linker and complain that it
396 # won't work with /Brepro.
397 string(TOUPPER "${CMAKE_EXE_LINKER_FLAGS}" upper_exe_flags)
398 string(TOUPPER "${CMAKE_MODULE_LINKER_FLAGS}" upper_module_flags)
399 string(TOUPPER "${CMAKE_SHARED_LINKER_FLAGS}" upper_shared_flags)
401 string(FIND "${upper_exe_flags} ${upper_module_flags} ${upper_shared_flags}"
402 "/INCREMENTAL" linker_flag_idx)
404 if (${linker_flag_idx} GREATER -1)
405 message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic")
407 append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
412 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
413 append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
414 append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS)
415 add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME)
416 add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW)
417 if (LLVM_ENABLE_CXX1Y)
418 check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y)
419 append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" CMAKE_CXX_FLAGS)
420 elseif(LLVM_ENABLE_CXX1Z)
421 check_cxx_compiler_flag("-std=c++1z" CXX_SUPPORTS_CXX1Z)
422 append_if(CXX_SUPPORTS_CXX1Z "-std=c++1z" CMAKE_CXX_FLAGS)
424 check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11)
425 if (CXX_SUPPORTS_CXX11)
427 # MinGW and Cygwin are a bit stricter and lack things like
428 # 'strdup', 'stricmp', etc in c++11 mode.
429 append("-std=gnu++11" CMAKE_CXX_FLAGS)
431 append("-std=c++11" CMAKE_CXX_FLAGS)
434 message(FATAL_ERROR "LLVM requires C++11 support but the '-std=c++11' flag isn't supported.")
437 if (LLVM_ENABLE_MODULES)
438 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
439 set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache")
440 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
441 # On Darwin -fmodules does not imply -fcxx-modules.
442 set(module_flags "${module_flags} -fcxx-modules")
444 if (LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY)
445 set(module_flags "${module_flags} -Xclang -fmodules-local-submodule-visibility")
447 if (LLVM_ENABLE_MODULE_DEBUGGING AND
448 ((uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") OR
449 (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")))
450 set(module_flags "${module_flags} -gmodules")
452 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${module_flags}")
454 # Check that we can build code with modules enabled, and that repeatedly
455 # including <cassert> still manages to respect NDEBUG properly.
456 CHECK_CXX_SOURCE_COMPILES("#undef NDEBUG
460 int main() { assert(this code is not compiled); }"
461 CXX_SUPPORTS_MODULES)
462 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
463 if (CXX_SUPPORTS_MODULES)
464 append("${module_flags}" CMAKE_CXX_FLAGS)
466 message(FATAL_ERROR "LLVM_ENABLE_MODULES is not supported by this compiler")
468 endif(LLVM_ENABLE_MODULES)
473 set(msvc_warning_flags
475 -wd4141 # Suppress ''modifier' : used more than once' (because of __forceinline combined with inline)
476 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
477 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
478 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
479 -wd4258 # Suppress ''var' : definition from the for loop is ignored; the definition from the enclosing scope is used'
480 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
481 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
482 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
483 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
484 -wd4355 # Suppress ''this' : used in base member initializer list'
485 -wd4456 # Suppress 'declaration of 'var' hides local variable'
486 -wd4457 # Suppress 'declaration of 'var' hides function parameter'
487 -wd4458 # Suppress 'declaration of 'var' hides class member'
488 -wd4459 # Suppress 'declaration of 'var' hides global declaration'
489 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
490 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
491 -wd4722 # Suppress 'function' : destructor never returns, potential memory leak
492 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
493 -wd4100 # Suppress 'unreferenced formal parameter'
494 -wd4127 # Suppress 'conditional expression is constant'
495 -wd4512 # Suppress 'assignment operator could not be generated'
496 -wd4505 # Suppress 'unreferenced local function has been removed'
497 -wd4610 # Suppress '<class> can never be instantiated'
498 -wd4510 # Suppress 'default constructor could not be generated'
499 -wd4702 # Suppress 'unreachable code'
500 -wd4245 # Suppress 'signed/unsigned mismatch'
501 -wd4706 # Suppress 'assignment within conditional expression'
502 -wd4310 # Suppress 'cast truncates constant value'
503 -wd4701 # Suppress 'potentially uninitialized local variable'
504 -wd4703 # Suppress 'potentially uninitialized local pointer variable'
505 -wd4389 # Suppress 'signed/unsigned mismatch'
506 -wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable'
507 -wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation'
508 -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer'
509 -wd4577 # Suppress 'noexcept used with no exception handling mode specified; termination on exception is not guaranteed'
510 -wd4091 # Suppress 'typedef: ignored on left of '' when no variable is declared'
511 # C4592 is disabled because of false positives in Visual Studio 2015
512 # Update 1. Re-evaluate the usefulness of this diagnostic with Update 2.
513 -wd4592 # Suppress ''var': symbol will be dynamically initialized (implementation limitation)
514 -wd4319 # Suppress ''operator' : zero extending 'type' to 'type' of greater size'
516 # Ideally, we'd like this warning to be enabled, but MSVC 2013 doesn't
517 # support the 'aligned' attribute in the way that clang sources requires (for
518 # any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to
519 # avoid unwanted alignment warnings.
520 # When we switch to requiring a version of MSVC that supports the 'alignas'
521 # specifier (MSVC 2015?) this warning can be re-enabled.
522 -wd4324 # Suppress 'structure was padded due to __declspec(align())'
525 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
527 # Promoted warnings to errors.
528 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
533 if (LLVM_ENABLE_WARNINGS)
534 # Put /W4 in front of all the -we flags. cl.exe doesn't care, but for
535 # clang-cl having /W4 after the -we flags will re-enable the warnings
537 set(msvc_warning_flags "/W4 ${msvc_warning_flags}")
538 # CMake appends /W3 by default, and having /W3 followed by /W4 will result in
539 # cl : Command line warning D9025 : overriding '/W3' with '/W4'. Since this is
540 # a command line warning and not a compiler warning, it cannot be suppressed except
541 # by fixing the command line.
542 string(REGEX REPLACE " /W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
543 string(REGEX REPLACE " /W[0-4]" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
545 if (LLVM_ENABLE_PEDANTIC)
546 # No MSVC equivalent available
547 endif (LLVM_ENABLE_PEDANTIC)
548 endif (LLVM_ENABLE_WARNINGS)
550 foreach(flag ${msvc_warning_flags})
551 append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
555 if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL))
557 # Don't add -Wall for clang-cl, because it maps -Wall to -Weverything for
558 # MSVC compatibility. /W4 is added above instead.
560 append("-Wall" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
563 append("-Wextra -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
564 append("-Wcast-qual" CMAKE_CXX_FLAGS)
566 # Turn off missing field initializer warnings for gcc to avoid noise from
567 # false positives with empty {}. Turn them on otherwise (they're off by
568 # default for clang).
569 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
570 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
571 if (CMAKE_COMPILER_IS_GNUCXX)
572 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
574 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
578 if (LLVM_ENABLE_PEDANTIC AND LLVM_COMPILER_IS_GCC_COMPATIBLE)
579 append("-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
580 append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
583 add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG)
584 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
585 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
587 # Disable -Wclass-memaccess, a C++-only warning from GCC 8 that fires on
588 # LLVM's ADT classes.
589 check_cxx_compiler_flag("-Wclass-memaccess" CXX_SUPPORTS_CLASS_MEMACCESS_FLAG)
590 append_if(CXX_SUPPORTS_CLASS_MEMACCESS_FLAG "-Wno-class-memaccess" CMAKE_CXX_FLAGS)
592 # The LLVM libraries have no stable C++ API, so -Wnoexcept-type is not useful.
593 check_cxx_compiler_flag("-Wnoexcept-type" CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG)
594 append_if(CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG "-Wno-noexcept-type" CMAKE_CXX_FLAGS)
596 # Check if -Wnon-virtual-dtor warns even though the class is marked final.
597 # If it does, don't add it. So it won't be added on clang 3.4 and older.
598 # This also catches cases when -Wnon-virtual-dtor isn't supported by
599 # the compiler at all. This flag is not activated for gcc since it will
600 # incorrectly identify a protected non-virtual base when there is a friend
601 # declaration. Don't activate this in general on Windows as this warning has
602 # too many false positives on COM-style classes, which are destroyed with
603 # Release() (PR32286).
604 if (NOT CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
605 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
606 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11 -Werror=non-virtual-dtor")
607 CHECK_CXX_SOURCE_COMPILES("class base {public: virtual void anchor();protected: ~base();};
608 class derived final : public base { public: ~derived();};
609 int main() { return 0; }"
610 CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR)
611 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
612 append_if(CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR
613 "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
616 # Enable -Wdelete-non-virtual-dtor if available.
617 add_flag_if_supported("-Wdelete-non-virtual-dtor" DELETE_NON_VIRTUAL_DTOR_FLAG)
619 # Check if -Wcomment is OK with an // comment ending with '\' if the next
620 # line is also a // comment.
621 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
622 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror -Wcomment")
623 CHECK_C_SOURCE_COMPILES("// \\\\\\n//\\nint main() {return 0;}"
624 C_WCOMMENT_ALLOWS_LINE_WRAP)
625 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
626 if (NOT C_WCOMMENT_ALLOWS_LINE_WRAP)
627 append("-Wno-comment" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
630 # Enable -Wstring-conversion to catch misuse of string literals.
631 add_flag_if_supported("-Wstring-conversion" STRING_CONVERSION_FLAG)
632 endif (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL))
634 if (LLVM_COMPILER_IS_GCC_COMPATIBLE AND NOT LLVM_ENABLE_WARNINGS)
635 append("-w" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
638 macro(append_common_sanitizer_flags)
640 # Append -fno-omit-frame-pointer and turn on debug info to get better
642 add_flag_if_supported("-fno-omit-frame-pointer" FNO_OMIT_FRAME_POINTER)
643 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
644 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
645 add_flag_if_supported("-gline-tables-only" GLINE_TABLES_ONLY)
647 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large.
648 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND LLVM_OPTIMIZE_SANITIZED_BUILDS)
649 add_flag_if_supported("-O1" O1)
652 # Keep frame pointers around.
653 append("/Oy-" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
654 if (LINKER_IS_LLD_LINK)
655 # Use DWARF debug info with LLD.
656 append("-gdwarf" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
658 # Enable codeview otherwise.
659 append("/Z7" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
661 # Always ask the linker to produce symbols with asan.
662 append("-debug" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
666 # Turn on sanitizers if necessary.
667 if(LLVM_USE_SANITIZER)
669 if (LLVM_USE_SANITIZER STREQUAL "Address")
670 append_common_sanitizer_flags()
671 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
672 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
673 append_common_sanitizer_flags()
674 append("-fsanitize=memory" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
675 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
676 append("-fsanitize-memory-track-origins" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
678 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined")
679 append_common_sanitizer_flags()
680 append("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all"
681 CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
682 elseif (LLVM_USE_SANITIZER STREQUAL "Thread")
683 append_common_sanitizer_flags()
684 append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
685 elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR
686 LLVM_USE_SANITIZER STREQUAL "Undefined;Address")
687 append_common_sanitizer_flags()
688 append("-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all"
689 CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
690 elseif (LLVM_USE_SANITIZER STREQUAL "Leaks")
691 append_common_sanitizer_flags()
692 append("-fsanitize=leak" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
694 message(FATAL_ERROR "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
697 if (LLVM_USE_SANITIZER STREQUAL "Address")
698 append_common_sanitizer_flags()
699 append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
701 message(FATAL_ERROR "This sanitizer not yet supported in the MSVC environment: ${LLVM_USE_SANITIZER}")
704 message(FATAL_ERROR "LLVM_USE_SANITIZER is not supported on this platform.")
706 if (LLVM_USE_SANITIZER MATCHES "(Undefined;)?Address(;Undefined)?")
707 add_flag_if_supported("-fsanitize-address-use-after-scope"
708 FSANITIZE_USE_AFTER_SCOPE_FLAG)
710 if (LLVM_USE_SANITIZE_COVERAGE)
711 append("-fsanitize=fuzzer-no-link" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
713 if (LLVM_USE_SANITIZER MATCHES ".*Undefined.*")
714 set(BLACKLIST_FILE "${CMAKE_SOURCE_DIR}/utils/sanitizers/ubsan_blacklist.txt")
715 if (EXISTS "${BLACKLIST_FILE}")
716 append("-fsanitize-blacklist=${BLACKLIST_FILE}"
717 CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
722 # Turn on -gsplit-dwarf if requested
723 if(LLVM_USE_SPLIT_DWARF)
724 add_definitions("-gsplit-dwarf")
727 add_definitions( -D__STDC_CONSTANT_MACROS )
728 add_definitions( -D__STDC_FORMAT_MACROS )
729 add_definitions( -D__STDC_LIMIT_MACROS )
731 # clang and gcc don't default-print colored diagnostics when invoked from Ninja.
733 CMAKE_GENERATOR STREQUAL "Ninja" AND
734 (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR
735 (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND
736 NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9))))
737 append("-fdiagnostics-color" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
740 # lld doesn't print colored diagnostics when invoked from Ninja
741 if (UNIX AND CMAKE_GENERATOR STREQUAL "Ninja")
742 include(CheckLinkerFlag)
743 check_linker_flag("-Wl,--color-diagnostics" LINKER_SUPPORTS_COLOR_DIAGNOSTICS)
744 append_if(LINKER_SUPPORTS_COLOR_DIAGNOSTICS "-Wl,--color-diagnostics"
745 CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
748 # Add flags for add_dead_strip().
749 # FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF?
750 # But MinSizeRel seems to add that automatically, so maybe disable these
751 # flags instead if LLVM_NO_DEAD_STRIP is set.
752 if(NOT CYGWIN AND NOT WIN32)
753 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND
754 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
755 check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS)
756 if (C_SUPPORTS_FNO_FUNCTION_SECTIONS)
757 # Don't add -ffunction-section if it can be disabled with -fno-function-sections.
758 # Doing so will break sanitizers.
759 add_flag_if_supported("-ffunction-sections" FFUNCTION_SECTIONS)
761 add_flag_if_supported("-fdata-sections" FDATA_SECTIONS)
766 # Remove flags here, for exceptions and RTTI.
767 # Each target property or source property should be responsible to control
769 # CL.EXE complains to override flags like "/GR /GR-".
770 string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
771 string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
774 # Provide public options to globally control RTTI and EH
775 option(LLVM_ENABLE_EH "Enable Exception handling" OFF)
776 option(LLVM_ENABLE_RTTI "Enable run time type information" OFF)
777 if(LLVM_ENABLE_EH AND NOT LLVM_ENABLE_RTTI)
778 message(FATAL_ERROR "Exception handling requires RTTI. You must set LLVM_ENABLE_RTTI to ON")
781 option(LLVM_ENABLE_IR_PGO "Build LLVM and tools with IR PGO instrumentation (deprecated)" Off)
782 mark_as_advanced(LLVM_ENABLE_IR_PGO)
784 set(LLVM_BUILD_INSTRUMENTED OFF CACHE STRING "Build LLVM and tools with PGO instrumentation. May be specified as IR or Frontend")
785 mark_as_advanced(LLVM_BUILD_INSTRUMENTED)
786 string(TOUPPER "${LLVM_BUILD_INSTRUMENTED}" uppercase_LLVM_BUILD_INSTRUMENTED)
788 if (LLVM_BUILD_INSTRUMENTED)
789 if (LLVM_ENABLE_IR_PGO OR uppercase_LLVM_BUILD_INSTRUMENTED STREQUAL "IR")
790 append("-fprofile-generate='${LLVM_PROFILE_DATA_DIR}'"
793 CMAKE_EXE_LINKER_FLAGS
794 CMAKE_SHARED_LINKER_FLAGS)
796 append("-fprofile-instr-generate='${LLVM_PROFILE_FILE_PATTERN}'"
799 CMAKE_EXE_LINKER_FLAGS
800 CMAKE_SHARED_LINKER_FLAGS)
804 option(LLVM_BUILD_INSTRUMENTED_COVERAGE "Build LLVM and tools with Code Coverage instrumentation" Off)
805 mark_as_advanced(LLVM_BUILD_INSTRUMENTED_COVERAGE)
806 append_if(LLVM_BUILD_INSTRUMENTED_COVERAGE "-fprofile-instr-generate='${LLVM_PROFILE_FILE_PATTERN}' -fcoverage-mapping"
809 CMAKE_EXE_LINKER_FLAGS
810 CMAKE_SHARED_LINKER_FLAGS)
812 if (LLVM_BUILD_INSTRUMENTED AND LLVM_BUILD_INSTRUMENTED_COVERAGE)
813 message(FATAL_ERROR "LLVM_BUILD_INSTRUMENTED and LLVM_BUILD_INSTRUMENTED_COVERAGE cannot both be specified")
816 if(LLVM_ENABLE_LTO AND LLVM_ON_WIN32 AND NOT LINKER_IS_LLD_LINK)
817 message(FATAL_ERROR "When compiling for Windows, LLVM_ENABLE_LTO requires using lld as the linker (point CMAKE_LINKER at lld-link.exe)")
819 if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
820 append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
821 if(NOT LINKER_IS_LLD_LINK)
822 append("-flto=thin" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
824 # If the linker supports it, enable the lto cache. This improves initial build
825 # time a little since we re-link a lot of the same objects, and significantly
826 # improves incremental build time.
827 # FIXME: We should move all this logic into the clang driver.
829 append("-Wl,-cache_path_lto,${PROJECT_BINARY_DIR}/lto.cache"
830 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
831 elseif(UNIX AND LLVM_USE_LINKER STREQUAL "lld")
832 append("-Wl,--thinlto-cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
833 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
834 elseif(LLVM_USE_LINKER STREQUAL "gold")
835 append("-Wl,--plugin-opt,cache-dir=${PROJECT_BINARY_DIR}/lto.cache"
836 CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
838 elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL")
839 append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
840 if(NOT LINKER_IS_LLD_LINK)
841 append("-flto=full" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
843 elseif(LLVM_ENABLE_LTO)
844 append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS)
845 if(NOT LINKER_IS_LLD_LINK)
846 append("-flto" CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
850 # This option makes utils/extract_symbols.py be used to determine the list of
851 # symbols to export from LLVM tools. This is necessary when using MSVC if you
852 # want to allow plugins, though note that the plugin has to explicitly link
853 # against (exactly one) tool so we can't unilaterally turn on
854 # LLVM_ENABLE_PLUGINS when it's enabled.
855 option(LLVM_EXPORT_SYMBOLS_FOR_PLUGINS "Export symbols from LLVM tools so that plugins can import them" OFF)
856 if(BUILD_SHARED_LIBS AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS)
857 message(FATAL_ERROR "BUILD_SHARED_LIBS not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS")
859 if(LLVM_LINK_LLVM_DYLIB AND LLVM_EXPORT_SYMBOLS_FOR_PLUGINS)
860 message(FATAL_ERROR "LLVM_LINK_LLVM_DYLIB not compatible with LLVM_EXPORT_SYMBOLS_FOR_PLUGINS")
864 # FIXME: Make this configurable.
866 if(BUILD_SHARED_LIBS OR LLVM_BUILD_LLVM_DYLIB)
867 set(LLVM_ENABLE_PLUGINS ON)
869 set(LLVM_ENABLE_PLUGINS OFF)
872 set(LLVM_ENABLE_PLUGINS ON)
875 # By default we should enable LLVM_ENABLE_IDE only for multi-configuration
876 # generators. This option disables optional build system features that make IDEs
878 set(LLVM_ENABLE_IDE_default OFF)
879 if (CMAKE_CONFIGURATION_TYPES)
880 set(LLVM_ENABLE_IDE_default ON)
882 option(LLVM_ENABLE_IDE
883 "Disable optional build system features that cause problems for IDE generators"
884 ${LLVM_ENABLE_IDE_default})
885 if (CMAKE_CONFIGURATION_TYPES AND NOT LLVM_ENABLE_IDE)
886 message(WARNING "Disabling LLVM_ENABLE_IDE on multi-configuration generators is not recommended.")
889 function(get_compile_definitions)
890 get_directory_property(top_dir_definitions DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS)
891 foreach(definition ${top_dir_definitions})
893 string(APPEND result " -D${definition}")
895 set(result "-D${definition}")
898 set(LLVM_DEFINITIONS "${result}" PARENT_SCOPE)
900 get_compile_definitions()
902 option(LLVM_FORCE_ENABLE_STATS "Enable statistics collection for builds that wouldn't normally enable it" OFF)