1 # HandleLibcxxFlags - A set of macros used to setup the flags used to compile
2 # and link libc++. These macros add flags to the following CMake variables.
3 # - LIBCXX_COMPILE_FLAGS: flags used to compile libc++
4 # - LIBCXX_LINK_FLAGS: flags used to link libc++
5 # - LIBCXX_LIBRARIES: libraries to link libc++ to.
7 include(CheckCXXCompilerFlag)
9 unset(add_flag_if_supported)
11 # Mangle the name of a compiler flag into a valid CMake identifier.
12 # Ex: --std=c++11 -> STD_EQ_CXX11
13 macro(mangle_name str output)
14 string(STRIP "${str}" strippedStr)
15 string(REGEX REPLACE "^/" "" strippedStr "${strippedStr}")
16 string(REGEX REPLACE "^-+" "" strippedStr "${strippedStr}")
17 string(REGEX REPLACE "-+$" "" strippedStr "${strippedStr}")
18 string(REPLACE "-" "_" strippedStr "${strippedStr}")
19 string(REPLACE ":" "_COLON_" strippedStr "${strippedStr}")
20 string(REPLACE "=" "_EQ_" strippedStr "${strippedStr}")
21 string(REPLACE "+" "X" strippedStr "${strippedStr}")
22 string(TOUPPER "${strippedStr}" ${output})
25 # Remove a list of flags from all CMake variables that affect compile flags.
26 # This can be used to remove unwanted flags specified on the command line
27 # or added in other parts of LLVM's cmake configuration.
30 string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
31 string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}")
32 string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
33 string(REPLACE "${var}" "" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
34 string(REPLACE "${var}" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
35 string(REPLACE "${var}" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
36 string(REPLACE "${var}" "" CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
37 string(REPLACE "${var}" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
38 string(REPLACE "${var}" "" CMAKE_SHARED_MODULE_FLAGS "${CMAKE_SHARED_MODULE_FLAGS}")
39 remove_definitions(${var})
41 endmacro(remove_flags)
43 macro(check_flag_supported flag)
44 mangle_name("${flag}" flagname)
45 check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
48 macro(append_flags DEST)
49 foreach(value ${ARGN})
50 list(APPEND ${DEST} ${value})
51 list(APPEND ${DEST} ${value})
55 # If the specified 'condition' is true then append the specified list of flags to DEST
56 macro(append_flags_if condition DEST)
58 list(APPEND ${DEST} ${ARGN})
62 # Add each flag in the list specified by DEST if that flag is supported by the current compiler.
63 macro(append_flags_if_supported DEST)
65 mangle_name("${flag}" flagname)
66 check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
67 append_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${DEST} ${flag})
71 # Add a macro definition if condition is true.
72 macro(define_if condition def)
74 add_definitions(${def})
78 # Add a macro definition if condition is not true.
79 macro(define_if_not condition def)
81 add_definitions(${def})
85 # Add a macro definition to the __config_site file if the specified condition
86 # is 'true'. Note that '-D${def}' is not added. Instead it is expected that
87 # the build include the '__config_site' header.
88 macro(config_define_if condition def)
94 macro(config_define_if_not condition def)
100 macro(config_define value def)
104 # Add a list of flags to all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS',
105 # 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'.
106 macro(add_target_flags)
107 foreach(value ${ARGN})
108 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${value}")
109 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${value}")
110 list(APPEND LIBCXX_COMPILE_FLAGS ${value})
111 list(APPEND LIBCXX_LINK_FLAGS ${value})
115 # If the specified 'condition' is true then add a list of flags to
116 # all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS', 'LIBCXX_COMPILE_FLAGS'
117 # and 'LIBCXX_LINK_FLAGS'.
118 macro(add_target_flags_if condition)
120 add_target_flags(${ARGN})
124 # Add a specified list of flags to both 'LIBCXX_COMPILE_FLAGS' and
125 # 'LIBCXX_LINK_FLAGS'.
127 foreach(value ${ARGN})
128 list(APPEND LIBCXX_COMPILE_FLAGS ${value})
129 list(APPEND LIBCXX_LINK_FLAGS ${value})
133 # If the specified 'condition' is true then add a list of flags to both
134 # 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'.
135 macro(add_flags_if condition)
141 # Add each flag in the list to LIBCXX_COMPILE_FLAGS and LIBCXX_LINK_FLAGS
142 # if that flag is supported by the current compiler.
143 macro(add_flags_if_supported)
144 foreach(flag ${ARGN})
145 mangle_name("${flag}" flagname)
146 check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
147 add_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag})
151 # Add a list of flags to 'LIBCXX_COMPILE_FLAGS'.
152 macro(add_compile_flags)
154 list(APPEND LIBCXX_COMPILE_FLAGS ${f})
158 # If 'condition' is true then add the specified list of flags to
159 # 'LIBCXX_COMPILE_FLAGS'
160 macro(add_compile_flags_if condition)
162 add_compile_flags(${ARGN})
166 # For each specified flag, add that flag to 'LIBCXX_COMPILE_FLAGS' if the
167 # flag is supported by the C++ compiler.
168 macro(add_compile_flags_if_supported)
169 foreach(flag ${ARGN})
170 mangle_name("${flag}" flagname)
171 check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
172 add_compile_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag})
176 # Add a list of flags to 'LIBCXX_LINK_FLAGS'.
177 macro(add_link_flags)
179 list(APPEND LIBCXX_LINK_FLAGS ${f})
183 # If 'condition' is true then add the specified list of flags to
184 # 'LIBCXX_LINK_FLAGS'
185 macro(add_link_flags_if condition)
187 add_link_flags(${ARGN})
191 # For each specified flag, add that flag to 'LIBCXX_LINK_FLAGS' if the
192 # flag is supported by the C++ compiler.
193 macro(add_link_flags_if_supported)
194 foreach(flag ${ARGN})
195 mangle_name("${flag}" flagname)
196 check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
197 add_link_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag})
201 # Add a list of libraries or link flags to 'LIBCXX_LIBRARIES'.
202 macro(add_library_flags)
204 list(APPEND LIBCXX_LIBRARIES ${lib})
208 # if 'condition' is true then add the specified list of libraries and flags
209 # to 'LIBCXX_LIBRARIES'.
210 macro(add_library_flags_if condition)
212 add_library_flags(${ARGN})
216 # Turn a comma separated CMake list into a space separated string.
217 macro(split_list listname)
218 string(REPLACE ";" " " ${listname} "${${listname}}")
221 # For each specified flag, add that link flag to the provided target.
222 # The flags are added with the given visibility, i.e. PUBLIC|PRIVATE|INTERFACE.
223 function(target_add_link_flags_if_supported target visibility)
224 foreach(flag ${ARGN})
225 mangle_name("${flag}" flagname)
226 check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
227 if (LIBCXX_SUPPORTS_${flagname}_FLAG)
228 target_link_libraries(${target} ${visibility} ${flag})
233 # For each specified flag, add that compile flag to the provided target.
234 # The flags are added with the given visibility, i.e. PUBLIC|PRIVATE|INTERFACE.
235 function(target_add_compile_flags_if_supported target visibility)
236 foreach(flag ${ARGN})
237 mangle_name("${flag}" flagname)
238 check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
239 if (LIBCXX_SUPPORTS_${flagname}_FLAG)
240 target_compile_options(${target} ${visibility} ${flag})