1 # This CMake module is responsible for interpreting the user defined LLVM_
2 # options and executing the appropriate CMake commands to realize the users'
3 # selections.
5 include(AddLLVMDefinitions)
6 include(CheckCCompilerFlag)
8 if( CMAKE_COMPILER_IS_GNUCXX )
9 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
10 elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
11 set(LLVM_COMPILER_IS_GCC_COMPATIBLE ON)
12 endif()
14 # Run-time build mode; It is used for unittests.
15 if(MSVC_IDE)
16 # Expect "$(Configuration)", "$(OutDir)", etc.
17 # It is expanded by msbuild or similar.
18 set(RUNTIME_BUILD_MODE "${CMAKE_CFG_INTDIR}")
19 elseif(NOT CMAKE_BUILD_TYPE STREQUAL "")
20 # Expect "Release" "Debug", etc.
21 # Or unittests could not run.
22 set(RUNTIME_BUILD_MODE ${CMAKE_BUILD_TYPE})
23 else()
24 # It might be "."
25 set(RUNTIME_BUILD_MODE "${CMAKE_CFG_INTDIR}")
26 endif()
28 if( LLVM_ENABLE_ASSERTIONS )
29 # MSVC doesn't like _DEBUG on release builds. See PR 4379.
30 if( NOT MSVC )
31 add_definitions( -D_DEBUG )
32 endif()
33 # On Release builds cmake automatically defines NDEBUG, so we
34 # explicitly undefine it:
35 if( uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
36 add_definitions( -UNDEBUG )
37 endif()
38 else()
39 if( NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE" )
40 if( NOT MSVC_IDE AND NOT XCODE )
41 add_definitions( -DNDEBUG )
42 endif()
43 endif()
44 endif()
46 if(WIN32)
47 if(CYGWIN)
48 set(LLVM_ON_WIN32 0)
49 set(LLVM_ON_UNIX 1)
50 else(CYGWIN)
51 set(LLVM_ON_WIN32 1)
52 set(LLVM_ON_UNIX 0)
53 endif(CYGWIN)
54 set(LTDL_SHLIB_EXT ".dll")
55 set(EXEEXT ".exe")
56 # Maximum path length is 160 for non-unicode paths
57 set(MAXPATHLEN 160)
58 else(WIN32)
59 if(UNIX)
60 set(LLVM_ON_WIN32 0)
61 set(LLVM_ON_UNIX 1)
62 if(APPLE)
63 set(LTDL_SHLIB_EXT ".dylib")
64 else(APPLE)
65 set(LTDL_SHLIB_EXT ".so")
66 endif(APPLE)
67 set(EXEEXT "")
68 # FIXME: Maximum path length is currently set to 'safe' fixed value
69 set(MAXPATHLEN 2024)
70 else(UNIX)
71 MESSAGE(SEND_ERROR "Unable to determine platform")
72 endif(UNIX)
73 endif(WIN32)
75 if( LLVM_ENABLE_PIC )
76 if( XCODE )
77 # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
78 # know how to disable this, so just force ENABLE_PIC off for now.
79 message(WARNING "-fPIC not supported with Xcode.")
80 elseif( WIN32 OR CYGWIN)
81 # On Windows all code is PIC. MinGW warns if -fPIC is used.
82 else()
83 include(CheckCXXCompilerFlag)
84 check_cxx_compiler_flag("-fPIC" SUPPORTS_FPIC_FLAG)
85 if( SUPPORTS_FPIC_FLAG )
86 message(STATUS "Building with -fPIC")
87 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
88 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
89 else( SUPPORTS_FPIC_FLAG )
90 message(WARNING "-fPIC not supported.")
91 endif()
93 if( WIN32 OR CYGWIN)
94 # MinGW warns if -fvisibility-inlines-hidden is used.
95 else()
96 check_cxx_compiler_flag("-fvisibility-inlines-hidden" SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG)
97 if( SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG )
98 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility-inlines-hidden")
99 endif()
100 endif()
101 endif()
102 endif()
104 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
105 # TODO: support other platforms and toolchains.
106 if( LLVM_BUILD_32_BITS )
107 message(STATUS "Building 32 bits executables and libraries.")
108 add_llvm_definitions( -m32 )
109 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
110 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
111 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -m32")
112 endif( LLVM_BUILD_32_BITS )
113 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
115 # On Win32 using MS tools, provide an option to set the number of parallel jobs
116 # to use.
117 if( MSVC_IDE )
118 set(LLVM_COMPILER_JOBS "0" CACHE STRING
119 "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
120 if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
121 if( LLVM_COMPILER_JOBS STREQUAL "0" )
122 add_llvm_definitions( /MP )
123 else()
124 if (MSVC10)
125 message(FATAL_ERROR
126 "Due to a bug in CMake only 0 and 1 is supported for "
127 "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
128 else()
129 message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
130 add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
131 endif()
132 endif()
133 else()
134 message(STATUS "Parallel compilation disabled")
135 endif()
136 endif()
138 if( MSVC )
139 include(ChooseMSVCCRT)
141 if( MSVC11 )
142 add_llvm_definitions(-D_VARIADIC_MAX=10)
143 endif()
145 # Add definitions that make MSVC much less annoying.
146 add_llvm_definitions(
147 # For some reason MS wants to deprecate a bunch of standard functions...
148 -D_CRT_SECURE_NO_DEPRECATE
149 -D_CRT_SECURE_NO_WARNINGS
150 -D_CRT_NONSTDC_NO_DEPRECATE
151 -D_CRT_NONSTDC_NO_WARNINGS
152 -D_SCL_SECURE_NO_DEPRECATE
153 -D_SCL_SECURE_NO_WARNINGS
155 # Disabled warnings.
156 -wd4065 # Suppress 'switch statement contains 'default' but no 'case' labels'
157 -wd4146 # Suppress 'unary minus operator applied to unsigned type, result still unsigned'
158 -wd4180 # Suppress 'qualifier applied to function type has no meaning; ignored'
159 -wd4181 # Suppress 'qualifier applied to reference type; ignored'
160 -wd4224 # Suppress 'nonstandard extension used : formal parameter 'identifier' was previously defined as a type'
161 -wd4244 # Suppress ''argument' : conversion from 'type1' to 'type2', possible loss of data'
162 -wd4267 # Suppress ''var' : conversion from 'size_t' to 'type', possible loss of data'
163 -wd4275 # Suppress 'An exported class was derived from a class that was not exported.'
164 -wd4291 # Suppress ''declaration' : no matching operator delete found; memory will not be freed if initialization throws an exception'
165 -wd4345 # Suppress 'behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized'
166 -wd4351 # Suppress 'new behavior: elements of array 'array' will be default initialized'
167 -wd4355 # Suppress ''this' : used in base member initializer list'
168 -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
169 -wd4551 # Suppress 'function call missing argument list'
170 -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
171 -wd4715 # Suppress ''function' : not all control paths return a value'
172 -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
174 # Promoted warnings.
175 -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.
177 # Promoted warnings to errors.
178 -we4238 # Promote 'nonstandard extension used : class rvalue used as lvalue' to error.
179 -we4239 # Promote 'nonstandard extension used : 'token' : conversion from 'type' to 'type'' to error.
180 )
182 # Enable warnings
183 if (LLVM_ENABLE_WARNINGS)
184 add_llvm_definitions( /W4 )
185 if (LLVM_ENABLE_PEDANTIC)
186 # No MSVC equivalent available
187 endif (LLVM_ENABLE_PEDANTIC)
188 endif (LLVM_ENABLE_WARNINGS)
189 if (LLVM_ENABLE_WERROR)
190 add_llvm_definitions( /WX )
191 endif (LLVM_ENABLE_WERROR)
192 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
193 if (LLVM_ENABLE_WARNINGS)
194 add_llvm_definitions( -Wall -W -Wno-unused-parameter -Wwrite-strings )
195 if (LLVM_ENABLE_PEDANTIC)
196 add_llvm_definitions( -pedantic -Wno-long-long )
197 endif (LLVM_ENABLE_PEDANTIC)
198 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
199 if( CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG )
200 set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wcovered-switch-default" )
201 endif()
202 check_c_compiler_flag("-Werror -Wcovered-switch-default" C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG)
203 if( C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG )
204 set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wcovered-switch-default" )
205 endif()
206 endif (LLVM_ENABLE_WARNINGS)
207 if (LLVM_ENABLE_WERROR)
208 add_llvm_definitions( -Werror )
209 endif (LLVM_ENABLE_WERROR)
210 endif( MSVC )
212 add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
213 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
214 add_llvm_definitions( -D__STDC_LIMIT_MACROS )