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( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
12 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
15 if( LLVM_ENABLE_ASSERTIONS )
16 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
18 add_definitions( -D_DEBUG )
20 # On Release builds cmake automatically defines NDEBUG, so we
21 # explicitly undefine it:
22 if( uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
23 add_definitions( -UNDEBUG )
26 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
27 if( NOT MSVC_IDE AND NOT XCODE )
28 add_definitions( -DNDEBUG )
41 set(LTDL_SHLIB_EXT ".dll")
43 # Maximum path length is 160 for non-unicode paths
50 set(LTDL_SHLIB_EXT ".dylib")
52 set(LTDL_SHLIB_EXT ".so")
55 # FIXME: Maximum path length is currently set to 'safe' fixed value
58 MESSAGE(SEND_ERROR "Unable to determine platform")
62 function(add_flag_or_print_warning flag)
63 check_c_compiler_flag(${flag} C_SUPPORTS_${flag})
64 check_cxx_compiler_flag(${flag} CXX_SUPPORTS_${flag})
65 if (C_SUPPORTS_${flag} AND CXX_SUPPORTS_${flag})
66 message(STATUS "Building with ${flag}")
67 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}" PARENT_SCOPE)
68 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
70 message(WARNING "${flag} is not supported.")
74 function(append value)
75 foreach(variable ${ARGN})
76 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
80 function(append_if condition value)
82 foreach(variable ${ARGN})
83 set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
90 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
91 # know how to disable this, so just force ENABLE_PIC off for now.
92 message(WARNING "-fPIC not supported with Xcode.")
93 elseif( WIN32 OR CYGWIN)
94 # On Windows all code is PIC. MinGW warns if -fPIC is used.
96 add_flag_or_print_warning("-fPIC")
99 # MinGW warns if -fvisibility-inlines-hidden is used.
101 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
102 append_if(SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG "-fvisibility-inlines-hidden" CMAKE_CXX_FLAGS)
107 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
108 # TODO: support other platforms and toolchains.
109 if( LLVM_BUILD_32_BITS )
110 message(STATUS "Building 32 bits executables and libraries.")
111 add_llvm_definitions( -m32 )
112 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
113 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
114 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
115 endif( LLVM_BUILD_32_BITS )
116 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
118 # On Win32 using MS tools, provide an option to set the number of parallel jobs
121 set(LLVM_COMPILER_JOBS "0" CACHE STRING
122 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
123 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
124 if( LLVM_COMPILER_JOBS STREQUAL "0" )
125 add_llvm_definitions( /MP )
129 "Due to a bug in CMake only 0 and 1 is supported for "
130 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
132 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
133 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
137 message(STATUS "Parallel compilation disabled")
142 include(ChooseMSVCCRT)
145 add_llvm_definitions(-D_VARIADIC_MAX=10)
148 # Add definitions that make MSVC much less annoying.
149 add_llvm_definitions(
150 # For some reason MS wants to deprecate a bunch of standard functions...
151 -D_CRT_SECURE_NO_DEPRECATE
152 -D_CRT_SECURE_NO_WARNINGS
153 -D_CRT_NONSTDC_NO_DEPRECATE
154 -D_CRT_NONSTDC_NO_WARNINGS
155 -D_SCL_SECURE_NO_DEPRECATE
156 -D_SCL_SECURE_NO_WARNINGS
159 -wd4065 # Suppress 'switch statement contains 'default' but no 'case' labels'
160 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
161 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
162 -wd4181 # Suppress 'qualifier applied to reference type; ignored'
163 -wd4224 # Suppress 'nonstandard extension used : formal parameter 'identifier' was previously defined as a type'
164 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
165 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
166 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
167 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
168 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
169 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
170 -wd4355 # Suppress ''this' : used in base member initializer list'
171 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
172 -wd4551 # Suppress 'function call missing argument list'
173 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
174 -wd4715 # Suppress ''function' : not all control paths return a value'
175 -wd4722 # Suppress ''function' : destructor never returns, potential memory leak'
176 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
179 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
181 # Promoted warnings to errors.
182 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
186 if (LLVM_ENABLE_WARNINGS)
187 add_llvm_definitions( /W4 )
188 if (LLVM_ENABLE_PEDANTIC)
189 # No MSVC equivalent available
190 endif (LLVM_ENABLE_PEDANTIC)
191 endif (LLVM_ENABLE_WARNINGS)
192 if (LLVM_ENABLE_WERROR)
193 add_llvm_definitions( /WX )
194 endif (LLVM_ENABLE_WERROR)
195 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
196 if (LLVM_ENABLE_WARNINGS)
197 append("-Wall -W -Wno-unused-parameter -Wwrite-strings" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
199 # Turn off missing field initializer warnings for gcc to avoid noise from
200 # false positives with empty {}. Turn them on otherwise (they're off by
201 # default for clang).
202 check_cxx_compiler_flag("-Wmissing-field-initializers" CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
203 if (CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG)
204 if (CMAKE_COMPILER_IS_GNUCXX)
205 append("-Wno-missing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
207 append("-Wmissing-field-initializers" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
211 append_if(LLVM_ENABLE_PEDANTIC "-pedantic -Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
212 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
213 append_if(CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_CXX_FLAGS)
214 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
215 append_if(C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG "-Wcovered-switch-default" CMAKE_C_FLAGS)
216 append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
217 append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
218 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor" CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG)
219 append_if(CXX_SUPPORTS_NON_VIRTUAL_DTOR_FLAG "-Wnon-virtual-dtor" CMAKE_CXX_FLAGS)
220 endif (LLVM_ENABLE_WARNINGS)
221 if (LLVM_ENABLE_WERROR)
222 add_llvm_definitions( -Werror )
223 endif (LLVM_ENABLE_WERROR)
226 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
227 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
228 add_llvm_definitions( -D__STDC_LIMIT_MACROS )