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