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)
8 if( CMAKE_COMPILER_IS_GNUCXX )
9 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
10 elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
11 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
14 if( LLVM_ENABLE_ASSERTIONS )
15 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
17 add_definitions( -D_DEBUG )
19 # On Release builds cmake automatically defines NDEBUG, so we
20 # explicitly undefine it:
21 if( uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
22 add_definitions( -UNDEBUG )
25 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
26 if( NOT MSVC_IDE AND NOT XCODE )
27 add_definitions( -DNDEBUG )
40 set(LTDL_SHLIB_EXT ".dll")
42 # Maximum path length is 160 for non-unicode paths
49 set(LTDL_SHLIB_EXT ".dylib")
51 set(LTDL_SHLIB_EXT ".so")
54 # FIXME: Maximum path length is currently set to 'safe' fixed value
57 MESSAGE(SEND_ERROR "Unable to determine platform")
63 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
64 # know how to disable this, so just force ENABLE_PIC off for now.
65 message(WARNING "-fPIC not supported with Xcode.")
66 elseif( WIN32 OR CYGWIN)
67 # On Windows all code is PIC. MinGW warns if -fPIC is used.
69 include(CheckCXXCompilerFlag)
70 check_cxx_compiler_flag("-fPIC" SUPPORTS_FPIC_FLAG)
71 if( SUPPORTS_FPIC_FLAG )
72 message(STATUS "Building with -fPIC")
73 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
74 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
75 else( SUPPORTS_FPIC_FLAG )
76 message(WARNING "-fPIC not supported.")
80 # MinGW warns if -fvisibility-inlines-hidden is used.
82 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
83 if( SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG )
84 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility-inlines-hidden")
90 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
91 # TODO: support other platforms and toolchains.
92 if( LLVM_BUILD_32_BITS )
93 message(STATUS "Building 32 bits executables and libraries.")
94 add_llvm_definitions( -m32 )
95 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
96 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
97 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
98 endif( LLVM_BUILD_32_BITS )
99 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
101 # On Win32 using MS tools, provide an option to set the number of parallel jobs
104 set(LLVM_COMPILER_JOBS "0" CACHE STRING
105 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
106 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
107 if( LLVM_COMPILER_JOBS STREQUAL "0" )
108 add_llvm_definitions( /MP )
112 "Due to a bug in CMake only 0 and 1 is supported for "
113 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
115 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
116 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
120 message(STATUS "Parallel compilation disabled")
125 include(ChooseMSVCCRT)
128 add_llvm_definitions(-D_VARIADIC_MAX=10)
131 # Add definitions that make MSVC much less annoying.
132 add_llvm_definitions(
133 # For some reason MS wants to deprecate a bunch of standard functions...
134 -D_CRT_SECURE_NO_DEPRECATE
135 -D_CRT_SECURE_NO_WARNINGS
136 -D_CRT_NONSTDC_NO_DEPRECATE
137 -D_CRT_NONSTDC_NO_WARNINGS
138 -D_SCL_SECURE_NO_DEPRECATE
139 -D_SCL_SECURE_NO_WARNINGS
142 -wd4065 # Suppress 'switch statement contains 'default' but no 'case' labels'
143 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
144 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
145 -wd4181 # Suppress 'qualifier applied to reference type; ignored'
146 -wd4224 # Suppress 'nonstandard extension used : formal parameter 'identifier' was previously defined as a type'
147 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
148 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
149 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
150 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
151 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
152 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
153 -wd4355 # Suppress ''this' : used in base member initializer list'
154 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
155 -wd4551 # Suppress 'function call missing argument list'
156 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
157 -wd4715 # Suppress ''function' : not all control paths return a value'
158 -wd4722 # Suppress ''function' : destructor never returns, potential memory leak'
159 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
162 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
164 # Promoted warnings to errors.
165 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
169 if (LLVM_ENABLE_WARNINGS)
170 add_llvm_definitions( /W4 )
171 if (LLVM_ENABLE_PEDANTIC)
172 # No MSVC equivalent available
173 endif (LLVM_ENABLE_PEDANTIC)
174 endif (LLVM_ENABLE_WARNINGS)
175 if (LLVM_ENABLE_WERROR)
176 add_llvm_definitions( /WX )
177 endif (LLVM_ENABLE_WERROR)
178 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
179 if (LLVM_ENABLE_WARNINGS)
180 add_llvm_definitions( -Wall -W -Wno-unused-parameter -Wwrite-strings )
182 # Turn off missing field initializer warnings for gcc to avoid noise from
183 # false positives with empty {}. Turn them on otherwise (they're off by
184 # default for clang).
185 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
186 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
187 if (CMAKE_COMPILER_IS_GNUCXX)
188 add_llvm_definitions( -Wno-missing-field-initializers )
190 add_llvm_definitions( -Wmissing-field-initializers )
194 if (LLVM_ENABLE_PEDANTIC)
195 add_llvm_definitions( -pedantic -Wno-long-long )
196 endif (LLVM_ENABLE_PEDANTIC)
197 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
198 if( CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG )
199 set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wcovered-switch-default" )
201 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
202 if( C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG )
203 set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wcovered-switch-default" )
205 endif (LLVM_ENABLE_WARNINGS)
206 if (LLVM_ENABLE_WERROR)
207 add_llvm_definitions( -Werror )
208 endif (LLVM_ENABLE_WERROR)
211 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
212 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
213 add_llvm_definitions( -D__STDC_LIMIT_MACROS )