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( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
14 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
17 if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
18 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
19 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
20 message(FATAL_ERROR "Host GCC version must be at least 4.7!")
22 elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
23 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
24 message(FATAL_ERROR "Host Clang version must be at least 3.1!")
26 elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
27 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 17.0)
28 message(FATAL_ERROR "Host Visual Studio must be at least 2012 (MSVC 17.0)")
33 if( LLVM_ENABLE_ASSERTIONS )
34 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
36 add_definitions( -D_DEBUG )
38 # On non-Debug builds cmake automatically defines NDEBUG, so we
39 # explicitly undefine it:
40 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
41 add_definitions( -UNDEBUG )
42 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines.
43 set(REGEXP_NDEBUG "(^| )[/-]D *NDEBUG($| )")
44 string (REGEX REPLACE "${REGEXP_NDEBUG}" " "
45 CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
46 string (REGEX REPLACE "${REGEXP_NDEBUG}" " "
47 CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
48 string (REGEX REPLACE "${REGEXP_NDEBUG}" " "
49 CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
52 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
53 if( NOT MSVC_IDE AND NOT XCODE )
54 add_definitions( -DNDEBUG )
60 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
68 # Maximum path length is 160 for non-unicode paths
75 set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
77 set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
79 # FIXME: Maximum path length is currently set to 'safe' fixed value
82 MESSAGE(SEND_ERROR "Unable to determine platform")
86 set(EXEEXT ${CMAKE_EXECUTABLE_SUFFIX})
87 set(LTDL_SHLIB_EXT ${CMAKE_SHARED_LIBRARY_SUFFIX})
88 set(LLVM_PLUGIN_EXT ${CMAKE_SHARED_MODULE_SUFFIX})
90 function(add_flag_or_print_warning flag)
91 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
92 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
93 if (C_SUPPORTS_FLAG AND CXX_SUPPORTS_FLAG)
94 message(STATUS "Building with ${flag}")
95 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
96 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
98 message(WARNING "${flag} is not supported.")
102 function(append value)
103 foreach(variable ${ARGN})
104 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
108 function(append_if condition value)
110 foreach(variable ${ARGN})
111 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
116 macro(add_flag_if_supported flag)
117 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
118 append_if(C_SUPPORTS_FLAG "${flag}" CMAKE_C_FLAGS)
119 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
120 append_if(CXX_SUPPORTS_FLAG "${flag}" CMAKE_CXX_FLAGS)
123 if( LLVM_ENABLE_PIC )
125 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
126 # know how to disable this, so just force ENABLE_PIC off for now.
127 message(WARNING "-fPIC not supported with Xcode.")
128 elseif( WIN32 OR CYGWIN)
129 # On Windows all code is PIC. MinGW warns if -fPIC is used.
131 add_flag_or_print_warning("-fPIC")
134 # MinGW warns if -fvisibility-inlines-hidden is used.
136 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
137 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
142 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
143 # TODO: support other platforms and toolchains.
144 if( LLVM_BUILD_32_BITS )
145 message(STATUS "Building 32 bits executables and libraries.")
146 add_llvm_definitions( -m32 )
147 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
148 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
149 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
150 endif( LLVM_BUILD_32_BITS )
151 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
153 # On Win32 using MS tools, provide an option to set the number of parallel jobs
156 set(LLVM_COMPILER_JOBS "0" CACHE STRING
157 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
158 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
159 if( LLVM_COMPILER_JOBS STREQUAL "0" )
160 add_llvm_definitions( /MP )
164 "Due to a bug in CMake only 0 and 1 is supported for "
165 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
167 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
168 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
172 message(STATUS "Parallel compilation disabled")
177 include(ChooseMSVCCRT)
179 if( NOT (${CMAKE_VERSION} VERSION_LESS 2.8.11) )
180 # set stack reserved size to ~10MB
181 # CMake previously automatically set this value for MSVC builds, but the
182 # behavior was changed in CMake 2.8.11 (Issue 12437) to use the MSVC default
183 # value (1 MB) which is not enough for us in tasks such as parsing recursive
184 # C++ templates in Clang.
185 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")
189 # MSVC 10 will complain about headers in the STL not being exported, but
190 # will not complain in MSVC 11.
191 add_llvm_definitions(
192 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
195 add_llvm_definitions(-D_VARIADIC_MAX=10)
198 # Add definitions that make MSVC much less annoying.
199 add_llvm_definitions(
200 # For some reason MS wants to deprecate a bunch of standard functions...
201 -D_CRT_SECURE_NO_DEPRECATE
202 -D_CRT_SECURE_NO_WARNINGS
203 -D_CRT_NONSTDC_NO_DEPRECATE
204 -D_CRT_NONSTDC_NO_WARNINGS
205 -D_SCL_SECURE_NO_DEPRECATE
206 -D_SCL_SECURE_NO_WARNINGS
209 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
210 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
211 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
212 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
213 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
214 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
215 -wd4355 # Suppress ''this' : used in base member initializer list'
216 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
217 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
218 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
219 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
222 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
224 # Promoted warnings to errors.
225 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
229 if (LLVM_ENABLE_WARNINGS)
230 add_llvm_definitions( /W4 )
231 if (LLVM_ENABLE_PEDANTIC)
232 # No MSVC equivalent available
233 endif (LLVM_ENABLE_PEDANTIC)
234 endif (LLVM_ENABLE_WARNINGS)
235 if (LLVM_ENABLE_WERROR)
236 add_llvm_definitions( /WX )
237 endif (LLVM_ENABLE_WERROR)
238 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
239 if (LLVM_ENABLE_WARNINGS)
240 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
242 # Turn off missing field initializer warnings for gcc to avoid noise from
243 # false positives with empty {}. Turn them on otherwise (they're off by
244 # default for clang).
245 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
246 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
247 if (CMAKE_COMPILER_IS_GNUCXX)
248 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
250 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
254 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
255 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
256 append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS)
257 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
258 append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS)
259 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
260 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
261 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG)
262 append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
263 endif (LLVM_ENABLE_WARNINGS)
264 if (LLVM_ENABLE_WERROR)
265 add_llvm_definitions( -Werror )
266 endif (LLVM_ENABLE_WERROR)
267 if (LLVM_ENABLE_CXX11)
268 check_cxx_compiler_flag("-std=c++11" CXX_SUPPORTS_CXX11)
269 append_if(CXX_SUPPORTS_CXX11 "-std=c++11" CMAKE_CXX_FLAGS)
270 endif (LLVM_ENABLE_CXX11)
271 if(LLVM_ENABLE_LIBCXX)
272 check_cxx_compiler_flag("-stdlib=libc++" CXX_SUPPORTS_STDLIB)
273 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_CXX_FLAGS)
274 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_EXE_LINKER_FLAGS)
275 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_SHARED_LINKER_FLAGS)
276 append_if(CXX_SUPPORTS_STDLIB "-stdlib=libc++" CMAKE_MODULE_LINKER_FLAGS)
280 macro(append_common_sanitizer_flags)
281 # Append -fno-omit-frame-pointer and turn on debug info to get better
283 add_flag_if_supported("-fno-omit-frame-pointer")
284 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
285 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
286 add_flag_if_supported("-gline-tables-only")
288 # Use -O1 even in debug mode, otherwise sanitizers slowdown is too large.
289 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
290 add_flag_if_supported("-O1")
294 # Turn on sanitizers if necessary.
295 if(LLVM_USE_SANITIZER)
297 if (LLVM_USE_SANITIZER STREQUAL "Address")
298 append_common_sanitizer_flags()
299 add_flag_or_print_warning("-fsanitize=address")
300 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
301 append_common_sanitizer_flags()
302 add_flag_or_print_warning("-fsanitize=memory")
303 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
304 add_flag_or_print_warning("-fsanitize-memory-track-origins")
307 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
310 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
314 # Turn on -gsplit-dwarf if requested
315 if(LLVM_USE_SPLIT_DWARF)
316 add_llvm_definitions("-gsplit-dwarf")
319 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
320 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
321 add_llvm_definitions( -D__STDC_LIMIT_MACROS )
323 # clang doesn't print colored diagnostics when invoked from Ninja
325 CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
326 CMAKE_GENERATOR STREQUAL "Ninja")
327 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)