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. 6 7include(CheckCXXCompilerFlag) 8 9unset(add_flag_if_supported) 10 11# Mangle the name of a compiler flag into a valid CMake identifier. 12# Ex: --std=c++11 -> STD_EQ_CXX11 13macro(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}) 23endmacro() 24 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. 28macro(remove_flags) 29 foreach(var ${ARGN}) 30 string(REPLACE "${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}) 40 endforeach() 41endmacro(remove_flags) 42 43macro(check_flag_supported flag) 44 mangle_name("${flag}" flagname) 45 check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG") 46endmacro() 47 48macro(append_flags DEST) 49 foreach(value ${ARGN}) 50 list(APPEND ${DEST} ${value}) 51 list(APPEND ${DEST} ${value}) 52 endforeach() 53endmacro() 54 55# If the specified 'condition' is true then append the specified list of flags to DEST 56macro(append_flags_if condition DEST) 57 if (${condition}) 58 list(APPEND ${DEST} ${ARGN}) 59 endif() 60endmacro() 61 62# Add each flag in the list specified by DEST if that flag is supported by the current compiler. 63macro(append_flags_if_supported DEST) 64 foreach(flag ${ARGN}) 65 mangle_name("${flag}" flagname) 66 check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG") 67 append_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${DEST} ${flag}) 68 endforeach() 69endmacro() 70 71# Add a macro definition if condition is true. 72macro(define_if condition def) 73 if (${condition}) 74 add_definitions(${def}) 75 endif() 76endmacro() 77 78# Add a macro definition if condition is not true. 79macro(define_if_not condition def) 80 if (NOT ${condition}) 81 add_definitions(${def}) 82 endif() 83endmacro() 84 85# Add a macro definition to the __config_site file if the specified condition 86# is 'true'. Note that '-D${def}' is not added. Instead it is expected that 87# the build include the '__config_site' header. 88macro(config_define_if condition def) 89 if (${condition}) 90 set(${def} ON) 91 endif() 92endmacro() 93 94macro(config_define_if_not condition def) 95 if (NOT ${condition}) 96 set(${def} ON) 97 endif() 98endmacro() 99 100macro(config_define value def) 101 set(${def} ${value}) 102endmacro() 103 104# Add a list of flags to all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS', 105# 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'. 106macro(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 ${value}) 112 endforeach() 113endmacro() 114 115# If the specified 'condition' is true then add a list of flags to 116# all of 'CMAKE_CXX_FLAGS', 'CMAKE_C_FLAGS', 'LIBCXX_COMPILE_FLAGS' 117# and 'LIBCXX_LINK_FLAGS'. 118macro(add_target_flags_if condition) 119 if (${condition}) 120 add_target_flags(${ARGN}) 121 endif() 122endmacro() 123 124# Add a specified list of flags to both 'LIBCXX_COMPILE_FLAGS' and 125# 'LIBCXX_LINK_FLAGS'. 126macro(add_flags) 127 foreach(value ${ARGN}) 128 list(APPEND LIBCXX_COMPILE_FLAGS ${value}) 129 list(APPEND LIBCXX_LINK_FLAGS ${value}) 130 endforeach() 131endmacro() 132 133# If the specified 'condition' is true then add a list of flags to both 134# 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'. 135macro(add_flags_if condition) 136 if (${condition}) 137 add_flags(${ARGN}) 138 endif() 139endmacro() 140 141# Add each flag in the list to LIBCXX_COMPILE_FLAGS and LIBCXX_LINK_FLAGS 142# if that flag is supported by the current compiler. 143macro(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}) 148 endforeach() 149endmacro() 150 151# Add a list of flags to 'LIBCXX_COMPILE_FLAGS'. 152macro(add_compile_flags) 153 foreach(f ${ARGN}) 154 list(APPEND LIBCXX_COMPILE_FLAGS ${f}) 155 endforeach() 156endmacro() 157 158# If 'condition' is true then add the specified list of flags to 159# 'LIBCXX_COMPILE_FLAGS' 160macro(add_compile_flags_if condition) 161 if (${condition}) 162 add_compile_flags(${ARGN}) 163 endif() 164endmacro() 165 166# For each specified flag, add that flag to 'LIBCXX_COMPILE_FLAGS' if the 167# flag is supported by the C++ compiler. 168macro(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}) 173 endforeach() 174endmacro() 175 176# Add a list of flags to 'LIBCXX_LINK_FLAGS'. 177macro(add_link_flags) 178 foreach(f ${ARGN}) 179 list(APPEND LIBCXX_LINK_FLAGS ${f}) 180 endforeach() 181endmacro() 182 183# If 'condition' is true then add the specified list of flags to 184# 'LIBCXX_LINK_FLAGS' 185macro(add_link_flags_if condition) 186 if (${condition}) 187 add_link_flags(${ARGN}) 188 endif() 189endmacro() 190 191# For each specified flag, add that flag to 'LIBCXX_LINK_FLAGS' if the 192# flag is supported by the C++ compiler. 193macro(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}) 198 endforeach() 199endmacro() 200 201# Add a list of libraries or link flags to 'LIBCXX_LIBRARIES'. 202macro(add_library_flags) 203 foreach(lib ${ARGN}) 204 list(APPEND LIBCXX_LIBRARIES ${lib}) 205 endforeach() 206endmacro() 207 208# if 'condition' is true then add the specified list of libraries and flags 209# to 'LIBCXX_LIBRARIES'. 210macro(add_library_flags_if condition) 211 if(${condition}) 212 add_library_flags(${ARGN}) 213 endif() 214endmacro() 215 216# Turn a comma separated CMake list into a space separated string. 217macro(split_list listname) 218 string(REPLACE ";" " " ${listname} "${${listname}}") 219endmacro() 220 221# 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. 223function(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}) 229 endif() 230 endforeach() 231endfunction() 232 233# 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. 235function(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}) 241 endif() 242 endforeach() 243endfunction() 244