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 include(AddLLVMDefinitions)
6 include(CheckCCompilerFlag)
7 include(CheckCXXCompilerFlag)
9 if( CMAKE_COMPILER_IS_GNUCXX )
10 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
12 set(LLVM_COMPILER_IS_GCC_COMPATIBLE OFF)
13 elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
14 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
17 if( LLVM_ENABLE_ASSERTIONS )
18 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
20 add_definitions( -D_DEBUG )
22 # On non-Debug builds cmake automatically defines NDEBUG, so we
23 # explicitly undefine it:
24 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
25 add_definitions( -UNDEBUG )
26 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines.
27 set(REGEXP_NDEBUG "(^| )[/-]D *NDEBUG($| )")
28 string (REGEX REPLACE "${REGEXP_NDEBUG}" " "
29 CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
30 string (REGEX REPLACE "${REGEXP_NDEBUG}" " "
31 CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
32 string (REGEX REPLACE "${REGEXP_NDEBUG}" " "
33 CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
36 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
37 if( NOT MSVC_IDE AND NOT XCODE )
38 add_definitions( -DNDEBUG )
44 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
52 set(LTDL_SHLIB_EXT ".dll")
54 # Maximum path length is 160 for non-unicode paths
61 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
62 set(LTDL_SHLIB_EXT ".dylib")
64 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
65 set(LTDL_SHLIB_EXT ".so")
68 # FIXME: Maximum path length is currently set to 'safe' fixed value
71 MESSAGE(SEND_ERROR "Unable to determine platform")
75 function(add_flag_or_print_warning flag)
76 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
77 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
78 if (C_SUPPORTS_FLAG AND CXX_SUPPORTS_FLAG)
79 message(STATUS "Building with ${flag}")
80 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
81 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
83 message(WARNING "${flag} is not supported.")
87 function(append value)
88 foreach(variable ${ARGN})
89 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
93 function(append_if condition value)
95 foreach(variable ${ARGN})
96 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
101 macro(add_flag_if_supported flag)
102 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
103 append_if(C_SUPPORTS_FLAG "${flag}" CMAKE_C_FLAGS)
104 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
105 append_if(CXX_SUPPORTS_FLAG "${flag}" CMAKE_CXX_FLAGS)
108 if( LLVM_ENABLE_PIC )
110 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
111 # know how to disable this, so just force ENABLE_PIC off for now.
112 message(WARNING "-fPIC not supported with Xcode.")
113 elseif( WIN32 OR CYGWIN)
114 # On Windows all code is PIC. MinGW warns if -fPIC is used.
116 add_flag_or_print_warning("-fPIC")
119 # MinGW warns if -fvisibility-inlines-hidden is used.
121 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
122 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
127 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
128 # TODO: support other platforms and toolchains.
129 if( LLVM_BUILD_32_BITS )
130 message(STATUS "Building 32 bits executables and libraries.")
131 add_llvm_definitions( -m32 )
132 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
133 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
134 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
135 endif( LLVM_BUILD_32_BITS )
136 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
138 # On Win32 using MS tools, provide an option to set the number of parallel jobs
141 set(LLVM_COMPILER_JOBS "0" CACHE STRING
142 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
143 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
144 if( LLVM_COMPILER_JOBS STREQUAL "0" )
145 add_llvm_definitions( /MP )
149 "Due to a bug in CMake only 0 and 1 is supported for "
150 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
152 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
153 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
157 message(STATUS "Parallel compilation disabled")
162 include(ChooseMSVCCRT)
164 if( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) )
165 # set stack reserved size to ~10MB
166 # CMake previously automatically set this value for MSVC builds, but the
167 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default
168 # value (1 MB) which is not enough for us in tasks such as parsing recursive
169 # C++ templates in Clang.
170 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")
174 # MSVC 10 will complain about headers in the STL not being exported, but
175 # will not complain in MSVC 11.
176 add_llvm_definitions(
177 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
180 add_llvm_definitions(-D_VARIADIC_MAX=10)
183 # Add definitions that make MSVC much less annoying.
184 add_llvm_definitions(
185 # For some reason MS wants to deprecate a bunch of standard functions...
186 -D_CRT_SECURE_NO_DEPRECATE
187 -D_CRT_SECURE_NO_WARNINGS
188 -D_CRT_NONSTDC_NO_DEPRECATE
189 -D_CRT_NONSTDC_NO_WARNINGS
190 -D_SCL_SECURE_NO_DEPRECATE
191 -D_SCL_SECURE_NO_WARNINGS
194 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
195 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
196 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
197 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
198 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
199 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
200 -wd4355 # Suppress ''this' : used in base member initializer list'
201 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
202 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
203 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
204 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
207 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
209 # Promoted warnings to errors.
210 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
214 if (LLVM_ENABLE_WARNINGS)
215 add_llvm_definitions( /W4 )
216 if (LLVM_ENABLE_PEDANTIC)
217 # No MSVC equivalent available
218 endif (LLVM_ENABLE_PEDANTIC)
219 endif (LLVM_ENABLE_WARNINGS)
220 if (LLVM_ENABLE_WERROR)
221 add_llvm_definitions( /WX )
222 endif (LLVM_ENABLE_WERROR)
223 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
224 if (LLVM_ENABLE_WARNINGS)
225 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
227 # Turn off missing field initializer warnings for gcc to avoid noise from
228 # false positives with empty {}. Turn them on otherwise (they're off by
229 # default for clang).
230 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
231 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
232 if (CMAKE_COMPILER_IS_GNUCXX)
233 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
235 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
239 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
240 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
241 append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS)
242 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
243 append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS)
244 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
245 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
246 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG)
247 append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
248 endif (LLVM_ENABLE_WARNINGS)
249 if (LLVM_ENABLE_WERROR)
250 add_llvm_definitions( -Werror )
251 endif (LLVM_ENABLE_WERROR)
252 if (LLVM_ENABLE_CXX11)
253 check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11)
254 append_if(CXX_SUPPORTS_CXX11 "-std=c++11" CMAKE_CXX_FLAGS)
255 endif (LLVM_ENABLE_CXX11)
256 if(LLVM_ENABLE_LIBCXX)
257 check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB)
258 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_CXX_FLAGS)
259 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_EXE_LINKER_FLAGS)
260 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_SHARED_LINKER_FLAGS)
261 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_MODULE_LINKER_FLAGS)
265 macro(append_common_sanitizer_flags)
266 # Append -fno-omit-frame-pointer and turn on debug info to get better
268 add_flag_if_supported("-fno-omit-frame-pointer")
269 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
270 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
271 add_flag_if_supported("-gline-tables-only")
273 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large.
274 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
275 add_flag_if_supported("-O1")
279 # Turn on sanitizers if necessary.
280 if(LLVM_USE_SANITIZER)
282 if (LLVM_USE_SANITIZER STREQUAL "Address")
283 append_common_sanitizer_flags()
284 add_flag_or_print_warning("-fsanitize=address")
285 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
286 append_common_sanitizer_flags()
287 add_flag_or_print_warning("-fsanitize=memory")
288 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
289 add_flag_or_print_warning("-fsanitize-memory-track-origins")
292 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
295 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
299 # Turn on -gsplit-dwarf if requested
300 if(LLVM_USE_SPLIT_DWARF)
301 add_llvm_definitions("-gsplit-dwarf")
304 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
305 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
306 add_llvm_definitions( -D__STDC_LIMIT_MACROS )
308 # clang doesn't print colored diagnostics when invoked from Ninja
310 CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
311 CMAKE_GENERATOR STREQUAL "Ninja")
312 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)