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)
11 elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
12 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
15 if( LLVM_ENABLE_ASSERTIONS )
16 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
18 add_definitions( -D_DEBUG )
20 # On non-Debug builds cmake automatically defines NDEBUG, so we
21 # explicitly undefine it:
22 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" )
23 add_definitions( -UNDEBUG )
24 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines.
25 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " "
26 CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
29 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
30 if( NOT MSVC_IDE AND NOT XCODE )
31 add_definitions( -DNDEBUG )
44 set(LTDL_SHLIB_EXT ".dll")
46 # Maximum path length is 160 for non-unicode paths
53 set(LTDL_SHLIB_EXT ".dylib")
55 set(LTDL_SHLIB_EXT ".so")
58 # FIXME: Maximum path length is currently set to 'safe' fixed value
61 MESSAGE(SEND_ERROR "Unable to determine platform")
65 function(add_flag_or_print_warning flag)
66 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
67 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
68 if (C_SUPPORTS_FLAG AND CXX_SUPPORTS_FLAG)
69 message(STATUS "Building with ${flag}")
70 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
71 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
73 message(WARNING "${flag} is not supported.")
77 function(append value)
78 foreach(variable ${ARGN})
79 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
83 function(append_if condition value)
85 foreach(variable ${ARGN})
86 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
91 macro(add_flag_if_supported flag)
92 check_c_compiler_flag(${flag} C_SUPPORTS_FLAG)
93 append_if(C_SUPPORTS_FLAG "${flag}" CMAKE_C_FLAGS)
94 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_FLAG)
95 append_if(CXX_SUPPORTS_FLAG "${flag}" CMAKE_CXX_FLAGS)
100 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
101 # know how to disable this, so just force ENABLE_PIC off for now.
102 message(WARNING "-fPIC not supported with Xcode.")
103 elseif( WIN32 OR CYGWIN)
104 # On Windows all code is PIC. MinGW warns if -fPIC is used.
106 add_flag_or_print_warning("-fPIC")
109 # MinGW warns if -fvisibility-inlines-hidden is used.
111 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
112 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
117 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
118 # TODO: support other platforms and toolchains.
119 if( LLVM_BUILD_32_BITS )
120 message(STATUS "Building 32 bits executables and libraries.")
121 add_llvm_definitions( -m32 )
122 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
123 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
124 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
125 endif( LLVM_BUILD_32_BITS )
126 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
128 # On Win32 using MS tools, provide an option to set the number of parallel jobs
131 set(LLVM_COMPILER_JOBS "0" CACHE STRING
132 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
133 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
134 if( LLVM_COMPILER_JOBS STREQUAL "0" )
135 add_llvm_definitions( /MP )
139 "Due to a bug in CMake only 0 and 1 is supported for "
140 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
142 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
143 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
147 message(STATUS "Parallel compilation disabled")
152 include(ChooseMSVCCRT)
155 add_llvm_definitions(-D_VARIADIC_MAX=10)
158 # Add definitions that make MSVC much less annoying.
159 add_llvm_definitions(
160 # For some reason MS wants to deprecate a bunch of standard functions...
161 -D_CRT_SECURE_NO_DEPRECATE
162 -D_CRT_SECURE_NO_WARNINGS
163 -D_CRT_NONSTDC_NO_DEPRECATE
164 -D_CRT_NONSTDC_NO_WARNINGS
165 -D_SCL_SECURE_NO_DEPRECATE
166 -D_SCL_SECURE_NO_WARNINGS
169 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
170 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
171 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
172 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
173 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
174 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
175 -wd4355 # Suppress ''this' : used in base member initializer list'
176 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
177 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
178 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
179 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
182 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
184 # Promoted warnings to errors.
185 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
189 if (LLVM_ENABLE_WARNINGS)
190 add_llvm_definitions( /W4 )
191 if (LLVM_ENABLE_PEDANTIC)
192 # No MSVC equivalent available
193 endif (LLVM_ENABLE_PEDANTIC)
194 endif (LLVM_ENABLE_WARNINGS)
195 if (LLVM_ENABLE_WERROR)
196 add_llvm_definitions( /WX )
197 endif (LLVM_ENABLE_WERROR)
198 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
199 if (LLVM_ENABLE_WARNINGS)
200 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
202 # Turn off missing field initializer warnings for gcc to avoid noise from
203 # false positives with empty {}. Turn them on otherwise (they're off by
204 # default for clang).
205 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
206 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
207 if (CMAKE_COMPILER_IS_GNUCXX)
208 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
210 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
214 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
215 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
216 append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS)
217 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
218 append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS)
219 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
220 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
221 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG)
222 append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
223 endif (LLVM_ENABLE_WARNINGS)
224 if (LLVM_ENABLE_WERROR)
225 add_llvm_definitions( -Werror )
226 endif (LLVM_ENABLE_WERROR)
229 macro(append_common_sanitizer_flags)
230 # Append -fno-omit-frame-pointer and turn on debug info to get better
232 add_flag_if_supported("-fno-omit-frame-pointer")
233 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
234 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
235 add_flag_if_supported("-gline-tables-only")
239 # Turn on sanitizers if necessary.
240 if(LLVM_USE_SANITIZER)
242 if (LLVM_USE_SANITIZER STREQUAL "Address")
243 append_common_sanitizer_flags()
244 add_flag_or_print_warning("-fsanitize=address")
245 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
246 append_common_sanitizer_flags()
247 add_flag_or_print_warning("-fsanitize=memory")
248 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
249 add_flag_or_print_warning("-fsanitize-memory-track-origins")
252 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
255 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
259 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
260 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
261 add_llvm_definitions( -D__STDC_LIMIT_MACROS )
263 # clang doesn't print colored diagnostics when invoked from Ninja
265 CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
266 CMAKE_GENERATOR STREQUAL "Ninja")
267 append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)