1 # See www/CMake.html for instructions on how to build libcxx with CMake. 2 3 #=============================================================================== 4 # Setup Project 5 #=============================================================================== 6 7 project(libcxx CXX C) 8 cmake_minimum_required(VERSION 2.8) 9 10 if(POLICY CMP0042) 11 cmake_policy(SET CMP0042 NEW) # Set MACOSX_RPATH=YES by default 12 endif() 13 14 set(PACKAGE_NAME libcxx) 15 set(PACKAGE_VERSION trunk-svn) 16 set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}") 17 set(PACKAGE_BUGREPORT "llvmbugs (a] cs.uiuc.edu") 18 19 # Add path for custom modules 20 set(CMAKE_MODULE_PATH 21 "${CMAKE_CURRENT_SOURCE_DIR}/cmake" 22 "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules" 23 ${CMAKE_MODULE_PATH} 24 ) 25 26 # Require out of source build. 27 include(MacroEnsureOutOfSourceBuild) 28 MACRO_ENSURE_OUT_OF_SOURCE_BUILD( 29 "${PROJECT_NAME} requires an out of source build. Please create a separate 30 build directory and run 'cmake /path/to/${PROJECT_NAME} [options]' there." 31 ) 32 33 if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR) 34 set(LIBCXX_LIBDIR_SUFFIX "" CACHE STRING 35 "Define suffix of library directory name (32/64)") 36 37 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX}) 38 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX}) 39 40 set(LIBCXX_BUILT_STANDALONE 1) 41 else() 42 set(LIBCXX_LIBDIR_SUFFIX ${LLVM_LIBDIR_SUFFIX}) 43 endif() 44 45 #=============================================================================== 46 # Setup CMake Options 47 #=============================================================================== 48 49 # Define options. 50 option(LIBCXX_ENABLE_EXCEPTIONS "Use exceptions." ON) 51 option(LIBCXX_ENABLE_RTTI "Use run time type information." ON) 52 option(LIBCXX_ENABLE_ASSERTIONS "Enable assertions independent of build mode." ON) 53 option(LIBCXX_ENABLE_PEDANTIC "Compile with pedantic enabled." ON) 54 option(LIBCXX_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF) 55 option(LIBCXX_ENABLE_CXX1Y "Enable -std=c++1y and use of c++1y language features if the compiler supports it." OFF) 56 option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON) 57 option(LIBCXX_ENABLE_THREADS "Build libc++ with support for threads." ON) 58 option(LIBCXX_BUILD_32_BITS "Build 32 bit libc++" OFF) 59 option(LIBCXX_ENABLE_MONOTONIC_CLOCK 60 "Build libc++ with support for a monotonic clock. 61 This option may only be used when LIBCXX_ENABLE_THREADS=OFF." ON) 62 option(LIBCXX_INSTALL_HEADERS "Install the libc++ headers." ON) 63 option(LIBCXX_INSTALL_SUPPORT_HEADERS "Install libc++ support headers." ON) 64 option(LIBCXX_ENABLE_STATIC_ABI_LIBRARY "Statically link the ABI library" OFF) 65 set(LIBCXX_SYSROOT "" CACHE STRING "Use alternate sysroot.") 66 set(LIBCXX_GCC_TOOLCHAIN "" CACHE STRING "Use alternate GCC toolchain.") 67 if (LIBCXX_BUILT_STANDALONE) 68 set(LLVM_USE_SANITIZER "" CACHE STRING 69 "Define the sanitizer used to build the library and tests") 70 endif() 71 72 if (LIBCXX_ENABLE_STATIC_ABI_LIBRARY) 73 if (APPLE) 74 message(FATAL_ERROR "LIBCXX_ENABLE_STATIC_ABI_LIBRARY is not supported on OS X") 75 else() 76 message(WARNING "LIBCXX_ENABLE_STATIC_ABI_LIBRARY is an experimental option") 77 endif() 78 endif() 79 80 set(CXXABIS none libcxxabi libcxxrt libstdc++ libsupc++) 81 if (NOT LIBCXX_CXX_ABI) 82 if (NOT DEFINED LIBCXX_BUILT_STANDALONE AND 83 IS_DIRECTORY "${CMAKE_SOURCE_DIR}/projects/libcxxabi") 84 set(LIBCXX_CXX_ABI_LIBNAME "libcxxabi") 85 set(LIBCXX_LIBCXXABI_INCLUDE_PATHS "${CMAKE_SOURCE_DIR}/projects/libcxxabi/include") 86 set(LIBCXX_CXX_ABI_INTREE 1) 87 else () 88 set(LIBCXX_CXX_ABI_LIBNAME "none") 89 endif () 90 else () 91 set(LIBCXX_CXX_ABI_LIBNAME "${LIBCXX_CXX_ABI}") 92 endif () 93 set(LIBCXX_CXX_ABI "${LIBCXX_CXX_ABI}" CACHE STRING 94 "Specify C++ ABI library to use." FORCE) 95 set_property(CACHE LIBCXX_CXX_ABI PROPERTY STRINGS ;${CXXABIS}) 96 97 #=============================================================================== 98 # Configure System 99 #=============================================================================== 100 101 set(LIBCXX_COMPILER ${CMAKE_CXX_COMPILER}) 102 set(LIBCXX_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}) 103 set(LIBCXX_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}) 104 set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX}) 105 106 # Declare libc++ configuration variables. 107 # They are intended for use as follows: 108 # LIBCXX_CXX_FLAGS: General flags for both the compiler and linker. 109 # LIBCXX_COMPILE_FLAGS: Compile only flags. 110 # LIBCXX_LINK_FLAGS: Linker only flags. 111 set(LIBCXX_CXX_FLAGS "") 112 set(LIBCXX_COMPILE_FLAGS "") 113 set(LIBCXX_LINK_FLAGS "") 114 115 # Configure compiler. 116 include(config-ix) 117 # Configure ABI library 118 include(HandleLibCXXABI) 119 120 #=============================================================================== 121 # Setup Compiler Flags 122 #=============================================================================== 123 124 # Get required flags. 125 # On all systems the system c++ standard library headers need to be excluded. 126 if (MSVC) 127 # MSVC only has -X, which disables all default includes; including the crt. 128 # Thus, we do nothing and hope we don't accidentally include any of the C++ 129 # headers. 130 else() 131 if (LIBCXX_HAS_NOSTDINCXX_FLAG) 132 list(APPEND LIBCXX_COMPILE_FLAGS -nostdinc++) 133 string(REPLACE "-stdlib=libc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 134 string(REPLACE "-stdlib=libstdc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") 135 endif() 136 # If c++1y has been enabled then attempt to use it. Fail if it is no supported 137 # by the compiler. Otherwise choose c++11 and ensure the compiler supports it. 138 if (LIBCXX_ENABLE_CXX1Y) 139 if (LIBCXX_HAS_STDCXX1Y_FLAG) 140 set(LIBCXX_STD_VERSION c++1y) 141 else() 142 message(FATAL_ERROR "c++1y was enabled but the compiler does not support it.") 143 endif() 144 else() 145 if (LIBCXX_HAS_STDCXX11_FLAG) 146 set(LIBCXX_STD_VERSION c++11) 147 else() 148 message(FATAL_ERROR "c++11 is required by libc++ but is not supported by the compiler") 149 endif() 150 endif() 151 # LIBCXX_STD_VERSION should always be set at this point. 152 list(APPEND LIBCXX_CXX_FLAGS "-std=${LIBCXX_STD_VERSION}") 153 endif() 154 155 macro(append_if list condition var) 156 if (${condition}) 157 list(APPEND ${list} ${var}) 158 endif() 159 endmacro() 160 161 # Get warning flags 162 if (NOT MSVC) 163 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WALL_FLAG -Wall) 164 list(APPEND LIBCXX_COMPILE_FLAGS -Werror=return-type) 165 endif() 166 167 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_W_FLAG -W) 168 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WNO_UNUSED_PARAMETER_FLAG -Wno-unused-parameter) 169 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WWRITE_STRINGS_FLAG -Wwrite-strings) 170 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WNO_LONG_LONG_FLAG -Wno-long-long) 171 if (LIBCXX_ENABLE_WERROR) 172 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WERROR_FLAG -Werror) 173 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WX_FLAG -WX) 174 else() 175 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_WNO_ERROR_FLAG -Wno-error) 176 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_NO_WX_FLAG -WX-) 177 endif() 178 if (LIBCXX_ENABLE_PEDANTIC) 179 append_if(LIBCXX_COMPILE_FLAGS LIBCXX_HAS_PEDANTIC_FLAG -pedantic) 180 endif() 181 182 # Get feature flags. 183 # Exceptions 184 if (LIBCXX_ENABLE_EXCEPTIONS) 185 # Catches C++ exceptions only and tells the compiler to assume that extern C 186 # functions never throw a C++ exception. 187 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_EHSC_FLAG -EHsc) 188 else() 189 list(APPEND LIBCXX_CXX_FLAGS -D_LIBCPP_NO_EXCEPTIONS) 190 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_NO_EHS_FLAG -EHs-) 191 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_NO_EHA_FLAG -EHa-) 192 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_FNO_EXCEPTIONS_FLAG -fno-exceptions) 193 endif() 194 # RTTI 195 if (NOT LIBCXX_ENABLE_RTTI) 196 list(APPEND LIBCXX_CXX_FLAGS -D_LIBCPP_NO_RTTI) 197 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_NO_GR_FLAG -GR-) 198 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_FNO_RTTI_FLAG -fno-rtti) 199 endif() 200 # Assert 201 string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE) 202 if (LIBCXX_ENABLE_ASSERTIONS) 203 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 204 if (NOT MSVC) 205 list(APPEND LIBCXX_COMPILE_FLAGS -D_DEBUG) 206 endif() 207 # On Release builds cmake automatically defines NDEBUG, so we 208 # explicitly undefine it: 209 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE") 210 list(APPEND LIBCXX_COMPILE_FLAGS -UNDEBUG) 211 endif() 212 else() 213 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELEASE") 214 list(APPEND LIBCXX_COMPILE_FLAGS -DNDEBUG) 215 endif() 216 endif() 217 # Static library 218 if (NOT LIBCXX_ENABLE_SHARED) 219 list(APPEND LIBCXX_COMPILE_FLAGS -D_LIBCPP_BUILD_STATIC) 220 endif() 221 222 if (CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32) 223 if (LIBCXX_BUILD_32_BITS) 224 message(STATUS "Building 32 bits executables and libraries.") 225 list(APPEND LIBCXX_CXX_FLAGS "-m32") 226 endif() 227 elseif(LIBCXX_BUILD_32_BITS) 228 message(FATAL_ERROR "LIBCXX_BUILD_32_BITS=ON is not supported on this platform.") 229 endif() 230 # This is the _ONLY_ place where add_definitions is called. 231 if (MSVC) 232 add_definitions(-D_CRT_SECURE_NO_WARNINGS) 233 endif() 234 235 # LIBCXX_ENABLE_THREADS configuration 236 if (NOT LIBCXX_ENABLE_THREADS) 237 add_definitions(-D_LIBCPP_HAS_NO_THREADS) 238 if (NOT LIBCXX_ENABLE_MONOTONIC_CLOCK) 239 add_definitions(-D_LIBCPP_HAS_NO_MONOTONIC_CLOCK) 240 endif() 241 # Ensure LIBCXX_ENABLE_MONOTONIC_CLOCK is set to ON. 242 elseif(NOT LIBCXX_ENABLE_MONOTONIC_CLOCK) 243 message(FATAL_ERROR "LIBCXX_ENABLE_MONOTONIC_CLOCK can only be set to OFF" 244 " when LIBCXX_ENABLE_THREADS is also set to OFF.") 245 endif() 246 247 # Configure for sanitizers. If LIBCXX_BUILT_STANDALONE then we have to do 248 # the flag translation ourselves. Othewise LLVM's CMakeList.txt will handle it. 249 if (LIBCXX_BUILT_STANDALONE) 250 # NOTE: LLVM_USE_SANITIZER checks for a UNIX like system instead of MSVC. 251 # But we don't have LLVM_ON_UNIX so checking for MSVC is the best we can do. 252 if (LLVM_USE_SANITIZER AND NOT MSVC) 253 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_FNO_OMIT_FRAME_POINTER_FLAG 254 "-fno-omit-frame-pointer") 255 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 256 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 257 append_if(LIBCXX_CXX_FLAGS LIBCXX_HAS_GLINE_TABLES_ONLY_FLAG 258 "-gline-tables-only") 259 endif() 260 if (LLVM_USE_SANITIZER STREQUAL "Address") 261 list(APPEND LIBCXX_CXX_FLAGS "-fsanitize=address") 262 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 263 list(APPEND LIBCXX_CXX_FLAGS "-fsanitize=memory") 264 if (LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 265 list(APPEND LIBCXX_CXX_FLAGS "-fsanitize-memory-track-origins") 266 endif() 267 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 268 list(APPEND LIBCXX_CXX_FLAGS 269 "-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover") 270 elseif (LLVM_USE_SANITIZER STREQUAL "Thread") 271 list(APPEND LIBCXX_CXX_FLAGS "-fsanitize=thread") 272 else() 273 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 274 endif() 275 elseif(MSVC) 276 message(WARNING "LLVM_USE_SANITIZER is not supported with MSVC") 277 endif() 278 endif() 279 280 append_if(LIBCXX_CXX_FLAGS LIBCXX_TARGET_TRIPLE 281 "-target ${LIBCXX_TARGET_TRIPLE}") 282 append_if(LIBCXX_CXX_FLAGS LIBCXX_SYSROOT "--sysroot ${LIBCXX_SYSROOT}") 283 append_if(LIBCXX_CXX_FLAGS LIBCXX_GCC_TOOLCHAIN 284 "-gcc-toolchain ${LIBCXX_GCC_TOOLCHAIN}") 285 286 string(REPLACE ";" " " LIBCXX_CXX_FLAGS "${LIBCXX_CXX_FLAGS}") 287 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LIBCXX_CXX_FLAGS}") 288 289 #=============================================================================== 290 # Setup Source Code 291 #=============================================================================== 292 293 include_directories(include) 294 add_subdirectory(include) 295 296 # Add source code. This also contains all of the logic for deciding linker flags 297 # soname, etc... 298 add_subdirectory(lib) 299 300 #=============================================================================== 301 # Setup Tests 302 #=============================================================================== 303 304 add_subdirectory(test) 305
