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( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
12 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
15 if( LLVM_ENABLE_ASSERTIONS )
16 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
18 add_definitions( -D_DEBUG )
20 # On Release builds cmake automatically defines NDEBUG, so we
21 # explicitly undefine it:
22 if( uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
23 add_definitions( -UNDEBUG )
24 # Also remove /D NDEBUG to avoid MSVC warnings about conflicting defines.
25 string (REGEX REPLACE "(^| )[/-]D *NDEBUG($| )" " "
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 -wd4065 # Suppress 'switch statement contains 'default' but no 'case' labels'
170 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
171 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
172 -wd4181 # Suppress 'qualifier applied to reference type; ignored'
173 -wd4224 # Suppress 'nonstandard extension used : formal parameter 'identifier' was previously defined as a type'
174 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
175 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
176 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
177 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
178 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
179 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
180 -wd4355 # Suppress ''this' : used in base member initializer list'
181 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
182 -wd4551 # Suppress 'function call missing argument list'
183 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
184 -wd4715 # Suppress ''function' : not all control paths return a value'
185 -wd4722 # Suppress ''function' : destructor never returns, potential memory leak'
186 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
189 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
191 # Promoted warnings to errors.
192 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
196 if (LLVM_ENABLE_WARNINGS)
197 add_llvm_definitions( /W4 )
198 if (LLVM_ENABLE_PEDANTIC)
199 # No MSVC equivalent available
200 endif (LLVM_ENABLE_PEDANTIC)
201 endif (LLVM_ENABLE_WARNINGS)
202 if (LLVM_ENABLE_WERROR)
203 add_llvm_definitions( /WX )
204 endif (LLVM_ENABLE_WERROR)
205 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
206 if (LLVM_ENABLE_WARNINGS)
207 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
209 # Turn off missing field initializer warnings for gcc to avoid noise from
210 # false positives with empty {}. Turn them on otherwise (they're off by
211 # default for clang).
212 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
213 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
214 if (CMAKE_COMPILER_IS_GNUCXX)
215 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
217 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
221 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
222 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
223 append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS)
224 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
225 append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS)
226 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
227 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
228 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG)
229 append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
230 endif (LLVM_ENABLE_WARNINGS)
231 if (LLVM_ENABLE_WERROR)
232 add_llvm_definitions( -Werror )
233 endif (LLVM_ENABLE_WERROR)
236 macro(append_common_sanitizer_flags)
237 # Append -fno-omit-frame-pointer and turn on debug info to get better
239 add_flag_if_supported("-fno-omit-frame-pointer")
240 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND
241 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
242 add_flag_if_supported("-gline-tables-only")
246 # Turn on sanitizers if necessary.
247 if(LLVM_USE_SANITIZER)
249 if (LLVM_USE_SANITIZER STREQUAL "Address")
250 append_common_sanitizer_flags()
251 add_flag_or_print_warning("-fsanitize=address")
252 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?")
253 append_common_sanitizer_flags()
254 add_flag_or_print_warning("-fsanitize=memory")
255 if(LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins")
256 add_flag_or_print_warning("-fsanitize-memory-track-origins")
259 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
262 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
266 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
267 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
268 add_llvm_definitions( -D__STDC_LIMIT_MACROS )