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 # Maximum path length is 160 for non-unicode paths
59 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
61 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
63 # FIXME: Maximum path length is currently set to 'safe' fixed value
66 MESSAGE(SEND_ERROR "Unable to determine platform")
70 set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX})
71 set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
72 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_MODULE_SUFFIX})
74 function(add_flag_or_print_warning flag)
75 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
76 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
77 if (C_SUPPORTS_FLAG AND CXX_SUPPORTS_FLAG)
78 message(STATUS "Building with ${flag}")
79 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
80 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
82 message(WARNING "${flag} is not supported.")
86 function(append value)
87 foreach(variable ${ARGN})
88 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
92 function(append_if condition value)
94 foreach(variable ${ARGN})
95 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
100 macro(add_flag_if_supported flag)
101 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
102 append_if(C_SUPPORTS_FLAG "${flag}" CMAKE_C_FLAGS)
103 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
104 append_if(CXX_SUPPORTS_FLAG "${flag}" CMAKE_CXX_FLAGS)
107 if( LLVM_ENABLE_PIC )
109 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
110 # know how to disable this, so just force ENABLE_PIC off for now.
111 message(WARNING "-fPIC not supported with Xcode.")
112 elseif( WIN32 OR CYGWIN)
113 # On Windows all code is PIC. MinGW warns if -fPIC is used.
115 add_flag_or_print_warning("-fPIC")
118 # MinGW warns if -fvisibility-inlines-hidden is used.
120 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
121 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
126 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
127 # TODO: support other platforms and toolchains.
128 if( LLVM_BUILD_32_BITS )
129 message(STATUS "Building 32 bits executables and libraries.")
130 add_llvm_definitions( -m32 )
131 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
132 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
133 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
134 endif( LLVM_BUILD_32_BITS )
135 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
137 # On Win32 using MS tools, provide an option to set the number of parallel jobs
140 set(LLVM_COMPILER_JOBS "0" CACHE STRING
141 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
142 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
143 if( LLVM_COMPILER_JOBS STREQUAL "0" )
144 add_llvm_definitions( /MP )
148 "Due to a bug in CMake only 0 and 1 is supported for "
149 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
151 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
152 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
156 message(STATUS "Parallel compilation disabled")
161 include(ChooseMSVCCRT)
163 if( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) )
164 # set stack reserved size to ~10MB
165 # CMake previously automatically set this value for MSVC builds, but the
166 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default
167 # value (1 MB) which is not enough for us in tasks such as parsing recursive
168 # C++ templates in Clang.
169 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")
173 # MSVC 10 will complain about headers in the STL not being exported, but
174 # will not complain in MSVC 11.
175 add_llvm_definitions(
176 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
179 add_llvm_definitions(-D_VARIADIC_MAX=10)
182 # Add definitions that make MSVC much less annoying.
183 add_llvm_definitions(
184 # For some reason MS wants to deprecate a bunch of standard functions...
185 -D_CRT_SECURE_NO_DEPRECATE
186 -D_CRT_SECURE_NO_WARNINGS
187 -D_CRT_NONSTDC_NO_DEPRECATE
188 -D_CRT_NONSTDC_NO_WARNINGS
189 -D_SCL_SECURE_NO_DEPRECATE
190 -D_SCL_SECURE_NO_WARNINGS
193 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
194 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
195 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
196 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
197 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
198 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
199 -wd4355 # Suppress ''this' : used in base member initializer list'
200 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
201 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
202 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
203 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
206 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
208 # Promoted warnings to errors.
209 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
213 if (LLVM_ENABLE_WARNINGS)
214 add_llvm_definitions( /W4 )
215 if (LLVM_ENABLE_PEDANTIC)
216 # No MSVC equivalent available
217 endif (LLVM_ENABLE_PEDANTIC)
218 endif (LLVM_ENABLE_WARNINGS)
219 if (LLVM_ENABLE_WERROR)
220 add_llvm_definitions( /WX )
221 endif (LLVM_ENABLE_WERROR)
222 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
223 if (LLVM_ENABLE_WARNINGS)
224 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
226 # Turn off missing field initializer warnings for gcc to avoid noise from
227 # false positives with empty {}. Turn them on otherwise (they're off by
228 # default for clang).
229 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
230 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
231 if (CMAKE_COMPILER_IS_GNUCXX)
232 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
234 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
238 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
239 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
240 append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS)
241 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
242 append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS)
243 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
244 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
245 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG)
246 append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
247 endif (LLVM_ENABLE_WARNINGS)
248 if (LLVM_ENABLE_WERROR)
249 add_llvm_definitions( -Werror )
250 endif (LLVM_ENABLE_WERROR)
251 if (LLVM_ENABLE_CXX11)
252 check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11)
253 append_if(CXX_SUPPORTS_CXX11 "-std=c++11" CMAKE_CXX_FLAGS)
254 endif (LLVM_ENABLE_CXX11)
255 if(LLVM_ENABLE_LIBCXX)
256 check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB)
257 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_CXX_FLAGS)
258 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_EXE_LINKER_FLAGS)
259 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_SHARED_LINKER_FLAGS)
260 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_MODULE_LINKER_FLAGS)
264 macro(append_common_sanitizer_flags)
265 # Append -fno-omit-frame-pointer and turn on debug info to get better
267 add_flag_if_supported("-fno-omit-frame-pointer")
268 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
269 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
270 add_flag_if_supported("-gline-tables-only")
272 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large.
273 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
274 add_flag_if_supported("-O1")
278 # Turn on sanitizers if necessary.
279 if(LLVM_USE_SANITIZER)
281 if (LLVM_USE_SANITIZER STREQUAL "Address")
282 append_common_sanitizer_flags()
283 add_flag_or_print_warning("-fsanitize=address")
284 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
285 append_common_sanitizer_flags()
286 add_flag_or_print_warning("-fsanitize=memory")
287 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
288 add_flag_or_print_warning("-fsanitize-memory-track-origins")
291 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
294 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
298 # Turn on -gsplit-dwarf if requested
299 if(LLVM_USE_SPLIT_DWARF)
300 add_llvm_definitions("-gsplit-dwarf")
303 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
304 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
305 add_llvm_definitions( -D__STDC_LIMIT_MACROS )
307 # clang doesn't print colored diagnostics when invoked from Ninja
309 CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
310 CMAKE_GENERATOR STREQUAL "Ninja")
311 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)