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( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
14 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
17 if( LLVM_ENABLE_ASSERTIONS )
18 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
20 add_definitions( -D_DEBUG )
22 # On non-Debug builds cmake automatically defines NDEBUG, so we
23 # explicitly undefine it:
24 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
25 add_definitions( -UNDEBUG )
26 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines.
27 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " "
28 CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
31 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
32 if( NOT MSVC_IDE AND NOT XCODE )
33 add_definitions( -DNDEBUG )
46 set(LTDL_SHLIB_EXT ".dll")
48 # Maximum path length is 160 for non-unicode paths
55 set(LTDL_SHLIB_EXT ".dylib")
57 set(LTDL_SHLIB_EXT ".so")
60 # FIXME: Maximum path length is currently set to 'safe' fixed value
63 MESSAGE(SEND_ERROR "Unable to determine platform")
67 function(add_flag_or_print_warning flag)
68 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
69 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
70 if (C_SUPPORTS_FLAG AND CXX_SUPPORTS_FLAG)
71 message(STATUS "Building with ${flag}")
72 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
73 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
75 message(WARNING "${flag} is not supported.")
79 function(append value)
80 foreach(variable ${ARGN})
81 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
85 function(append_if condition value)
87 foreach(variable ${ARGN})
88 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
93 macro(add_flag_if_supported flag)
94 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
95 append_if(C_SUPPORTS_FLAG "${flag}" CMAKE_C_FLAGS)
96 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
97 append_if(CXX_SUPPORTS_FLAG "${flag}" CMAKE_CXX_FLAGS)
100 if( LLVM_ENABLE_PIC )
102 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
103 # know how to disable this, so just force ENABLE_PIC off for now.
104 message(WARNING "-fPIC not supported with Xcode.")
105 elseif( WIN32 OR CYGWIN)
106 # On Windows all code is PIC. MinGW warns if -fPIC is used.
108 add_flag_or_print_warning("-fPIC")
111 # MinGW warns if -fvisibility-inlines-hidden is used.
113 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
114 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
119 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
120 # TODO: support other platforms and toolchains.
121 if( LLVM_BUILD_32_BITS )
122 message(STATUS "Building 32 bits executables and libraries.")
123 add_llvm_definitions( -m32 )
124 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
125 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
126 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
127 endif( LLVM_BUILD_32_BITS )
128 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
130 # On Win32 using MS tools, provide an option to set the number of parallel jobs
133 set(LLVM_COMPILER_JOBS "0" CACHE STRING
134 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
135 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
136 if( LLVM_COMPILER_JOBS STREQUAL "0" )
137 add_llvm_definitions( /MP )
141 "Due to a bug in CMake only 0 and 1 is supported for "
142 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
144 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
145 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
149 message(STATUS "Parallel compilation disabled")
154 include(ChooseMSVCCRT)
157 # MSVC 10 will complain about headers in the STL not being exported, but
158 # will not complain in MSVC 11.
159 add_llvm_definitions(
160 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
163 add_llvm_definitions(-D_VARIADIC_MAX=10)
166 # Add definitions that make MSVC much less annoying.
167 add_llvm_definitions(
168 # For some reason MS wants to deprecate a bunch of standard functions...
169 -D_CRT_SECURE_NO_DEPRECATE
170 -D_CRT_SECURE_NO_WARNINGS
171 -D_CRT_NONSTDC_NO_DEPRECATE
172 -D_CRT_NONSTDC_NO_WARNINGS
173 -D_SCL_SECURE_NO_DEPRECATE
174 -D_SCL_SECURE_NO_WARNINGS
177 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
178 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
179 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
180 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
181 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
182 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
183 -wd4355 # Suppress ''this' : used in base member initializer list'
184 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
185 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
186 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
187 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
190 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
192 # Promoted warnings to errors.
193 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
197 if (LLVM_ENABLE_WARNINGS)
198 add_llvm_definitions( /W4 )
199 if (LLVM_ENABLE_PEDANTIC)
200 # No MSVC equivalent available
201 endif (LLVM_ENABLE_PEDANTIC)
202 endif (LLVM_ENABLE_WARNINGS)
203 if (LLVM_ENABLE_WERROR)
204 add_llvm_definitions( /WX )
205 endif (LLVM_ENABLE_WERROR)
206 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
207 if (LLVM_ENABLE_WARNINGS)
208 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
210 # Turn off missing field initializer warnings for gcc to avoid noise from
211 # false positives with empty {}. Turn them on otherwise (they're off by
212 # default for clang).
213 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
214 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
215 if (CMAKE_COMPILER_IS_GNUCXX)
216 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
218 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
222 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
223 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
224 append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS)
225 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
226 append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS)
227 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
228 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
229 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG)
230 append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
231 endif (LLVM_ENABLE_WARNINGS)
232 if (LLVM_ENABLE_WERROR)
233 add_llvm_definitions( -Werror )
234 endif (LLVM_ENABLE_WERROR)
237 macro(append_common_sanitizer_flags)
238 # Append -fno-omit-frame-pointer and turn on debug info to get better
240 add_flag_if_supported("-fno-omit-frame-pointer")
241 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
242 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
243 add_flag_if_supported("-gline-tables-only")
245 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large.
246 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
247 add_flag_if_supported("-O1")
251 # Turn on sanitizers if necessary.
252 if(LLVM_USE_SANITIZER)
254 if (LLVM_USE_SANITIZER STREQUAL "Address")
255 append_common_sanitizer_flags()
256 add_flag_or_print_warning("-fsanitize=address")
257 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
258 append_common_sanitizer_flags()
259 add_flag_or_print_warning("-fsanitize=memory")
260 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
261 add_flag_or_print_warning("-fsanitize-memory-track-origins")
264 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
267 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
271 # Turn on -gsplit-dwarf if requested
272 if(LLVM_USE_SPLIT_DWARF)
273 add_llvm_definitions("-gsplit-dwarf")
276 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
277 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
278 add_llvm_definitions( -D__STDC_LIMIT_MACROS )
280 # clang doesn't print colored diagnostics when invoked from Ninja
282 CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
283 CMAKE_GENERATOR STREQUAL "Ninja")
284 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)