1 # See www/CMake.html for instructions on how to build libcxx with CMake. 2 3 #=============================================================================== 4 # Setup Project 5 #=============================================================================== 6 cmake_minimum_required(VERSION 3.4.3) 7 8 if(POLICY CMP0042) 9 cmake_policy(SET CMP0042 NEW) # Set MACOSX_RPATH=YES by default 10 endif() 11 if(POLICY CMP0022) 12 cmake_policy(SET CMP0022 NEW) # Required when interacting with LLVM and Clang 13 endif() 14 15 # Add path for custom modules 16 set(CMAKE_MODULE_PATH 17 "${CMAKE_CURRENT_SOURCE_DIR}/cmake" 18 "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules" 19 ${CMAKE_MODULE_PATH} 20 ) 21 22 if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR) 23 project(libcxx CXX C) 24 25 set(PACKAGE_NAME libcxx) 26 set(PACKAGE_VERSION 6.0.0svn) 27 set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}") 28 set(PACKAGE_BUGREPORT "llvm-bugs (a] lists.llvm.org") 29 30 # Find the LLVM sources and simulate LLVM CMake options. 31 include(HandleOutOfTreeLLVM) 32 endif() 33 34 if (LIBCXX_STANDALONE_BUILD) 35 include(FindPythonInterp) 36 if( NOT PYTHONINTERP_FOUND ) 37 message(WARNING "Failed to find python interpreter. " 38 "The libc++ test suite will be disabled.") 39 set(LLVM_INCLUDE_TESTS OFF) 40 endif() 41 endif() 42 43 # Require out of source build. 44 include(MacroEnsureOutOfSourceBuild) 45 MACRO_ENSURE_OUT_OF_SOURCE_BUILD( 46 "${PROJECT_NAME} requires an out of source build. Please create a separate 47 build directory and run 'cmake /path/to/${PROJECT_NAME} [options]' there." 48 ) 49 50 if (MSVC) 51 set(LIBCXX_TARGETING_MSVC ON) 52 else() 53 set(LIBCXX_TARGETING_MSVC OFF) 54 endif() 55 56 #=============================================================================== 57 # Setup CMake Options 58 #=============================================================================== 59 include(CMakeDependentOption) 60 include(HandleCompilerRT) 61 62 # Basic options --------------------------------------------------------------- 63 option(LIBCXX_ENABLE_ASSERTIONS "Enable assertions independent of build mode." OFF) 64 option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON) 65 option(LIBCXX_ENABLE_STATIC "Build libc++ as a static library." ON) 66 option(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY "Build libc++experimental.a" ON) 67 set(ENABLE_FILESYSTEM_DEFAULT ${LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY}) 68 if (WIN32) 69 set(ENABLE_FILESYSTEM_DEFAULT OFF) 70 endif() 71 option(LIBCXX_ENABLE_FILESYSTEM "Build filesystem as part of libc++experimental.a" 72 ${ENABLE_FILESYSTEM_DEFAULT}) 73 option(LIBCXX_INCLUDE_TESTS "Build the libc++ tests." ${LLVM_INCLUDE_TESTS}) 74 75 # Benchmark options ----------------------------------------------------------- 76 option(LIBCXX_INCLUDE_BENCHMARKS "Build the libc++ benchmarks and their dependancies" ON) 77 set(LIBCXX_BENCHMARK_NATIVE_STDLIB "" CACHE STRING 78 "Build the benchmarks against the specified native STL. 79 The value must be one of libc++/libstdc++") 80 set(LIBCXX_BENCHMARK_NATIVE_GCC_TOOLCHAIN "" CACHE STRING 81 "Use alternate GCC toolchain when building the native benchmarks") 82 83 if (LIBCXX_BENCHMARK_NATIVE_STDLIB) 84 if (NOT (LIBCXX_BENCHMARK_NATIVE_STDLIB STREQUAL "libc++" 85 OR LIBCXX_BENCHMARK_NATIVE_STDLIB STREQUAL "libstdc++")) 86 message(FATAL_ERROR "Invalid value for LIBCXX_BENCHMARK_NATIVE_STDLIB: " 87 "'${LIBCXX_BENCHMARK_NATIVE_STDLIB}'") 88 endif() 89 endif() 90 91 option(LIBCXX_INCLUDE_DOCS "Build the libc++ documentation." ${LLVM_INCLUDE_DOCS}) 92 set(LIBCXX_LIBDIR_SUFFIX "${LLVM_LIBDIR_SUFFIX}" CACHE STRING 93 "Define suffix of library directory name (32/64)") 94 option(LIBCXX_INSTALL_HEADERS "Install the libc++ headers." ON) 95 option(LIBCXX_INSTALL_LIBRARY "Install the libc++ library." ON) 96 option(LIBCXX_INSTALL_SUPPORT_HEADERS "Install libc++ support headers." ON) 97 cmake_dependent_option(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY 98 "Install libc++experimental.a" ON 99 "LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY;LIBCXX_INSTALL_LIBRARY" OFF) 100 set(LIBCXX_ABI_VERSION 1 CACHE STRING "ABI version of libc++.") 101 option(LIBCXX_ABI_UNSTABLE "Unstable ABI of libc++." OFF) 102 option(LIBCXX_USE_COMPILER_RT "Use compiler-rt instead of libgcc" OFF) 103 104 if (NOT LIBCXX_ENABLE_SHARED AND NOT LIBCXX_ENABLE_STATIC) 105 message(FATAL_ERROR "libc++ must be built as either a shared or static library.") 106 endif() 107 108 # ABI Library options --------------------------------------------------------- 109 set(LIBCXX_CXX_ABI "default" CACHE STRING 110 "Specify C++ ABI library to use.") 111 set(CXXABIS none default libcxxabi libcxxrt libstdc++ libsupc++ vcruntime) 112 set_property(CACHE LIBCXX_CXX_ABI PROPERTY STRINGS ;${CXXABIS}) 113 114 # Setup the default options if LIBCXX_CXX_ABI is not specified. 115 if (LIBCXX_CXX_ABI STREQUAL "default") 116 find_path( 117 LIBCXX_LIBCXXABI_INCLUDES_INTERNAL 118 cxxabi.h 119 PATHS ${LLVM_MAIN_SRC_DIR}/projects/libcxxabi/include 120 ${LLVM_MAIN_SRC_DIR}/runtimes/libcxxabi/include 121 ${LLVM_MAIN_SRC_DIR}/../libcxxabi/include 122 NO_DEFAULT_PATH 123 ) 124 if (LIBCXX_TARGETING_MSVC) 125 # FIXME: Figure out how to configure the ABI library on Windows. 126 set(LIBCXX_CXX_ABI_LIBNAME "vcruntime") 127 elseif ((NOT LIBCXX_STANDALONE_BUILD OR HAVE_LIBCXXABI) AND 128 IS_DIRECTORY "${LIBCXX_LIBCXXABI_INCLUDES_INTERNAL}") 129 set(LIBCXX_CXX_ABI_LIBNAME "libcxxabi") 130 set(LIBCXX_CXX_ABI_INCLUDE_PATHS "${LIBCXX_LIBCXXABI_INCLUDES_INTERNAL}") 131 set(LIBCXX_CXX_ABI_INTREE 1) 132 elseif (APPLE) 133 set(LIBCXX_CXX_ABI_LIBNAME "libcxxabi") 134 set(LIBCXX_CXX_ABI_SYSTEM 1) 135 else() 136 set(LIBCXX_CXX_ABI_LIBNAME "default") 137 endif() 138 else() 139 set(LIBCXX_CXX_ABI_LIBNAME "${LIBCXX_CXX_ABI}") 140 endif() 141 142 # Use a static copy of the ABI library when linking libc++. This option 143 # cannot be used with LIBCXX_ENABLE_ABI_LINKER_SCRIPT. 144 option(LIBCXX_ENABLE_STATIC_ABI_LIBRARY "Statically link the ABI library" OFF) 145 146 # Generate and install a linker script inplace of libc++.so. The linker script 147 # will link libc++ to the correct ABI library. This option is on by default 148 # on UNIX platforms other than Apple unless 'LIBCXX_ENABLE_STATIC_ABI_LIBRARY' 149 # is on. This option is also disabled when the ABI library is not specified 150 # or is specified to be "none". 151 set(ENABLE_LINKER_SCRIPT_DEFAULT_VALUE OFF) 152 if (LLVM_HAVE_LINK_VERSION_SCRIPT AND NOT LIBCXX_ENABLE_STATIC_ABI_LIBRARY 153 AND NOT LIBCXX_CXX_ABI_LIBNAME STREQUAL "none" 154 AND NOT LIBCXX_CXX_ABI_LIBNAME STREQUAL "default" 155 AND PYTHONINTERP_FOUND 156 AND LIBCXX_ENABLE_SHARED) 157 set(ENABLE_LINKER_SCRIPT_DEFAULT_VALUE ON) 158 endif() 159 160 option(LIBCXX_ENABLE_ABI_LINKER_SCRIPT 161 "Use and install a linker script for the given ABI library" 162 ${ENABLE_LINKER_SCRIPT_DEFAULT_VALUE}) 163 164 set(ENABLE_NEW_DELETE_DEFAULT ON) 165 if (LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS) 166 # FIXME: This option should default to off. Unfortunatly GCC 4.9 fails to link 167 # programs due to undefined references to new/delete in libc++abi so to work 168 # around this libc++abi currently defaults LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS 169 # to ON. Once the GCC bug has been worked around this option should be changed 170 # back to OFF. 171 set(ENABLE_NEW_DELETE_DEFAULT ON) 172 endif() 173 174 option(LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS 175 "Build libc++ with definitions for operator new/delete. This option can 176 be used to disable the definitions when libc++abi is expected to provide 177 them" ${ENABLE_NEW_DELETE_DEFAULT}) 178 179 # Build libc++abi with libunwind. We need this option to determine whether to 180 # link with libunwind or libgcc_s while running the test cases. 181 option(LIBCXXABI_USE_LLVM_UNWINDER "Build and use the LLVM unwinder." OFF) 182 option(LIBCXXABI_ENABLE_STATIC_UNWINDER "Statically link the LLVM unwinder." OFF) 183 184 # Target options -------------------------------------------------------------- 185 option(LIBCXX_BUILD_32_BITS "Build 32 bit libc++." ${LLVM_BUILD_32_BITS}) 186 set(LIBCXX_SYSROOT "" CACHE STRING "Use alternate sysroot.") 187 set(LIBCXX_GCC_TOOLCHAIN "" CACHE STRING "Use alternate GCC toolchain.") 188 189 # Feature options ------------------------------------------------------------- 190 option(LIBCXX_ENABLE_EXCEPTIONS "Use exceptions." ON) 191 option(LIBCXX_ENABLE_RTTI "Use run time type information." ON) 192 option(LIBCXX_ENABLE_GLOBAL_FILESYSTEM_NAMESPACE "Build libc++ with support for the global filesystem namespace." ON) 193 option(LIBCXX_ENABLE_STDIN "Build libc++ with support for stdin/std::cin." ON) 194 option(LIBCXX_ENABLE_STDOUT "Build libc++ with support for stdout/std::cout." ON) 195 option(LIBCXX_ENABLE_THREADS "Build libc++ with support for threads." ON) 196 option(LIBCXX_ENABLE_THREAD_UNSAFE_C_FUNCTIONS "Build libc++ with support for thread-unsafe C functions" ON) 197 option(LIBCXX_ENABLE_MONOTONIC_CLOCK 198 "Build libc++ with support for a monotonic clock. 199 This option may only be set to OFF when LIBCXX_ENABLE_THREADS=OFF." ON) 200 option(LIBCXX_HAS_MUSL_LIBC "Build libc++ with support for the Musl C library" OFF) 201 option(LIBCXX_HAS_PTHREAD_API "Ignore auto-detection and force use of pthread API" OFF) 202 option(LIBCXX_HAS_EXTERNAL_THREAD_API 203 "Build libc++ with an externalized threading API. 204 This option may only be set to ON when LIBCXX_ENABLE_THREADS=ON." OFF) 205 option(LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY 206 "Build libc++ with an externalized threading library. 207 This option may only be set to ON when LIBCXX_ENABLE_THREADS=ON" OFF) 208 209 # Misc options ---------------------------------------------------------------- 210 # FIXME: Turn -pedantic back ON. It is currently off because it warns 211 # about #include_next which is used everywhere. 212 option(LIBCXX_ENABLE_PEDANTIC "Compile with pedantic enabled." OFF) 213 option(LIBCXX_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF) 214 option(LIBCXX_DISABLE_MACRO_CONFLICT_WARNINGS "Disable #warnings about conflicting macros." OFF) 215 216 option(LIBCXX_GENERATE_COVERAGE "Enable generating code coverage." OFF) 217 set(LIBCXX_COVERAGE_LIBRARY "" CACHE STRING 218 "The Profile-rt library used to build with code coverage") 219 220 # Don't allow a user to accidentally overwrite the system libc++ installation on Darwin. 221 # If the user specifies -DCMAKE_INSTALL_PREFIX=/usr the install rules for libc++ 222 # will not be generated and a warning will be issued. 223 option(LIBCXX_OVERRIDE_DARWIN_INSTALL "Enable overwriting darwins libc++ installation." OFF) 224 mark_as_advanced(LIBCXX_OVERRIDE_DARWIN_INSTALL) # Don't show this option by default. 225 226 if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" AND NOT LIBCXX_OVERRIDE_DARWIN_INSTALL) 227 if ("${CMAKE_INSTALL_PREFIX}" STREQUAL "/usr") 228 message(WARNING "Disabling libc++ install rules because installation would " 229 "overwrite the systems installation. Configure with " 230 "-DLIBCXX_OVERRIDE_DARWIN_INSTALL=ON to suppress this behaviour.") 231 mark_as_advanced(CLEAR LIBCXX_OVERRIDE_DARWIN_INSTALL) # Show the override option. 232 set(LIBCXX_INSTALL_HEADERS OFF) 233 set(LIBCXX_INSTALL_LIBRARY OFF) 234 endif() 235 endif() 236 237 set(LIBCXX_CONFIGURE_IDE_DEFAULT OFF) 238 if (XCODE OR MSVC_IDE) 239 set(LIBCXX_CONFIGURE_IDE_DEFAULT ON) 240 endif() 241 option(LIBCXX_CONFIGURE_IDE "Configure libcxx for use within an IDE" 242 ${LIBCXX_CONFIGURE_IDE_DEFAULT}) 243 244 #=============================================================================== 245 # Check option configurations 246 #=============================================================================== 247 248 if (LIBCXX_ENABLE_FILESYSTEM AND NOT LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY) 249 message(FATAL_ERROR 250 "LIBCXX_ENABLE_FILESYSTEM cannot be turned on when LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF") 251 endif() 252 253 # Ensure LIBCXX_ENABLE_MONOTONIC_CLOCK is set to ON only when 254 # LIBCXX_ENABLE_THREADS is on. 255 if(LIBCXX_ENABLE_THREADS AND NOT LIBCXX_ENABLE_MONOTONIC_CLOCK) 256 message(FATAL_ERROR "LIBCXX_ENABLE_MONOTONIC_CLOCK can only be set to OFF" 257 " when LIBCXX_ENABLE_THREADS is also set to OFF.") 258 endif() 259 260 if(NOT LIBCXX_ENABLE_THREADS) 261 if(LIBCXX_HAS_PTHREAD_API) 262 message(FATAL_ERROR "LIBCXX_HAS_PTHREAD_API can only be set to ON" 263 " when LIBCXX_ENABLE_THREADS is also set to ON.") 264 endif() 265 if(LIBCXX_HAS_EXTERNAL_THREAD_API) 266 message(FATAL_ERROR "LIBCXX_HAS_EXTERNAL_THREAD_API can only be set to ON" 267 " when LIBCXX_ENABLE_THREADS is also set to ON.") 268 endif() 269 if (LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY) 270 message(FATAL_ERROR "LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY can only be set " 271 "to ON when LIBCXX_ENABLE_THREADS is also set to ON.") 272 endif() 273 274 endif() 275 276 if (LIBCXX_HAS_EXTERNAL_THREAD_API) 277 if (LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY) 278 message(FATAL_ERROR "The options LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY and " 279 "LIBCXX_HAS_EXTERNAL_THREAD_API cannot both be ON at " 280 "the same time") 281 endif() 282 if (LIBCXX_HAS_PTHREAD_API) 283 message(FATAL_ERROR "The options LIBCXX_HAS_EXTERNAL_THREAD_API" 284 "and LIBCXX_HAS_PTHREAD_API cannot be both" 285 "set to ON at the same time.") 286 endif() 287 endif() 288 289 # Ensure LLVM_USE_SANITIZER is not specified when LIBCXX_GENERATE_COVERAGE 290 # is ON. 291 if (LLVM_USE_SANITIZER AND LIBCXX_GENERATE_COVERAGE) 292 message(FATAL_ERROR "LLVM_USE_SANITIZER cannot be used with LIBCXX_GENERATE_COVERAGE") 293 endif() 294 295 # Set LIBCXX_BUILD_32_BITS to (LIBCXX_BUILD_32_BITS OR LLVM_BUILD_32_BITS) 296 # and check that we can build with 32 bits if requested. 297 if (CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32) 298 if (LIBCXX_BUILD_32_BITS AND NOT LLVM_BUILD_32_BITS) # Don't duplicate the output from LLVM 299 message(STATUS "Building 32 bits executables and libraries.") 300 endif() 301 elseif(LIBCXX_BUILD_32_BITS) 302 message(FATAL_ERROR "LIBCXX_BUILD_32_BITS=ON is not supported on this platform.") 303 endif() 304 305 # Check that this option is not enabled on Apple and emit a usage warning. 306 if (LIBCXX_ENABLE_STATIC_ABI_LIBRARY) 307 if (APPLE) 308 message(FATAL_ERROR "LIBCXX_ENABLE_STATIC_ABI_LIBRARY is not supported on OS X") 309 else() 310 message(WARNING "LIBCXX_ENABLE_STATIC_ABI_LIBRARY is an experimental option") 311 endif() 312 if (LIBCXX_ENABLE_STATIC AND NOT PYTHONINTERP_FOUND) 313 message(FATAL_ERROR "LIBCXX_ENABLE_STATIC_ABI_LIBRARY requires python but it was not found.") 314 endif() 315 endif() 316 317 if (LIBCXX_ENABLE_ABI_LINKER_SCRIPT) 318 if (APPLE) 319 message(FATAL_ERROR "LIBCXX_ENABLE_ABI_LINKER_SCRIPT cannot be used on APPLE targets") 320 endif() 321 if (NOT PYTHONINTERP_FOUND) 322 message(FATAL_ERROR "LIBCXX_ENABLE_ABI_LINKER_SCRIPT requires python but it was not found.") 323 endif() 324 if (NOT LIBCXX_ENABLE_SHARED) 325 message(FATAL_ERROR "LIBCXX_ENABLE_ABI_LINKER_SCRIPT is only available for shared library builds.") 326 endif() 327 endif() 328 329 if (LIBCXX_ENABLE_STATIC_ABI_LIBRARY AND LIBCXX_ENABLE_ABI_LINKER_SCRIPT) 330 message(FATAL_ERROR "Conflicting options given. 331 LIBCXX_ENABLE_STATIC_ABI_LIBRARY cannot be specified with 332 LIBCXX_ENABLE_ABI_LINKER_SCRIPT") 333 endif() 334 335 if (LIBCXX_HAS_MUSL_LIBC AND NOT LIBCXX_INSTALL_SUPPORT_HEADERS) 336 message(FATAL_ERROR "LIBCXX_INSTALL_SUPPORT_HEADERS can not be turned off" 337 "when building for Musl with LIBCXX_HAS_MUSL_LIBC.") 338 endif() 339 340 #=============================================================================== 341 # Configure System 342 #=============================================================================== 343 344 set(LIBCXX_COMPILER ${CMAKE_CXX_COMPILER}) 345 set(LIBCXX_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}) 346 set(LIBCXX_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}) 347 set(LIBCXX_BINARY_INCLUDE_DIR "${LIBCXX_BINARY_DIR}/include/c++build") 348 if (LLVM_LIBRARY_OUTPUT_INTDIR) 349 set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}) 350 else() 351 set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX}) 352 endif() 353 file(MAKE_DIRECTORY "${LIBCXX_BINARY_INCLUDE_DIR}") 354 355 set(LIBCXX_INSTALL_PREFIX "" CACHE STRING 356 "Define libc++ destination prefix.") 357 358 if (NOT LIBCXX_INSTALL_PREFIX MATCHES "^$|.*/") 359 message(FATAL_ERROR "LIBCXX_INSTALL_PREFIX has to end with \"/\".") 360 endif() 361 362 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBCXX_LIBRARY_DIR}) 363 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LIBCXX_LIBRARY_DIR}) 364 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LIBCXX_LIBRARY_DIR}) 365 366 # Declare libc++ configuration variables. 367 # They are intended for use as follows: 368 # LIBCXX_CXX_FLAGS: General flags for both the compiler and linker. 369 # LIBCXX_COMPILE_FLAGS: Compile only flags. 370 # LIBCXX_LINK_FLAGS: Linker only flags. 371 # LIBCXX_LIBRARIES: libraries libc++ is linked to. 372 # LIBCXX_INTERFACE_LIBRARIES: Libraries that must be linked when using libc++ 373 # These libraries are exposed in the linker script. 374 set(LIBCXX_COMPILE_FLAGS "") 375 set(LIBCXX_LINK_FLAGS "") 376 set(LIBCXX_LIBRARIES "") 377 set(LIBCXX_INTERFACE_LIBRARIES "") 378 379 # Include macros for adding and removing libc++ flags. 380 include(HandleLibcxxFlags) 381 382 # Target flags ================================================================ 383 # These flags get added to CMAKE_CXX_FLAGS and CMAKE_C_FLAGS so that 384 # 'config-ix' use them during feature checks. It also adds them to both 385 # 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS' 386 add_target_flags_if(LIBCXX_BUILD_32_BITS "-m32") 387 add_target_flags_if(LIBCXX_TARGET_TRIPLE "--target=${LIBCXX_TARGET_TRIPLE}") 388 add_target_flags_if(LIBCXX_SYSROOT "--sysroot=${LIBCXX_SYSROOT}") 389 add_target_flags_if(LIBCXX_GCC_TOOLCHAIN "--gcc-toolchain=${LIBCXX_GCC_TOOLCHAIN}") 390 if (LIBCXX_TARGET_TRIPLE) 391 set(TARGET_TRIPLE "${LIBCXX_TARGET_TRIPLE}") 392 endif() 393 394 # Configure compiler. 395 include(config-ix) 396 397 if (LIBCXX_USE_COMPILER_RT) 398 list(APPEND LIBCXX_LINK_FLAGS "-rtlib=compiler-rt") 399 endif() 400 401 # Configure coverage options. 402 if (LIBCXX_GENERATE_COVERAGE) 403 include(CodeCoverage) 404 set(CMAKE_BUILD_TYPE "COVERAGE" CACHE STRING "" FORCE) 405 endif() 406 407 string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE) 408 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") 409 set(LIBCXX_DEBUG_BUILD ON) 410 else() 411 set(LIBCXX_DEBUG_BUILD OFF) 412 endif() 413 414 #=============================================================================== 415 # Setup Compiler Flags 416 #=============================================================================== 417 418 include(HandleLibCXXABI) # Setup the ABI library flags 419 420 if (NOT LIBCXX_STANDALONE_BUILD) 421 # Remove flags that may have snuck in. 422 remove_flags(-DNDEBUG -UNDEBUG -D_DEBUG 423 -lc++abi) 424 endif() 425 remove_flags(-stdlib=libc++ -stdlib=libstdc++) 426 427 # FIXME: Remove all debug flags and flags that change which Windows 428 # default libraries are linked. Currently we only support linking the 429 # non-debug DLLs 430 remove_flags("/D_DEBUG" "/MTd" "/MDd" "/MT" "/Md") 431 432 # FIXME(EricWF): See the FIXME on LIBCXX_ENABLE_PEDANTIC. 433 # Remove the -pedantic flag and -Wno-pedantic and -pedantic-errors 434 # so they don't get transformed into -Wno and -errors respectively. 435 remove_flags(-Wno-pedantic -pedantic-errors -pedantic) 436 437 # Required flags ============================================================== 438 set(LIBCXX_STANDARD_VER c++11 CACHE INTERNAL "internal option to change build dialect") 439 if (LIBCXX_HAS_MUSL_LIBC) 440 # musl's pthread implementations uses volatile types in their structs which is 441 # not a constexpr in C++11 but is in C++14, so we use C++14 with musl. 442 set(LIBCXX_STANDARD_VER c++14 CACHE INTERNAL "internal option to change build dialect") 443 endif() 444 add_compile_flags_if_supported(-std=${LIBCXX_STANDARD_VER}) 445 mangle_name("LIBCXX_SUPPORTS_STD_EQ_${LIBCXX_STANDARD_VER}_FLAG" SUPPORTS_DIALECT_NAME) 446 if(NOT ${SUPPORTS_DIALECT_NAME}) 447 if(NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" AND NOT "${CMAKE_CXX_SIMULATE_ID}" STREQUAL "MSVC") 448 message(FATAL_ERROR "C++11 or greater is required but the compiler does not support ${LIBCXX_STANDARD_VER}") 449 endif() 450 endif() 451 452 # On all systems the system c++ standard library headers need to be excluded. 453 # MSVC only has -X, which disables all default includes; including the crt. 454 # Thus, we do nothing and hope we don't accidentally include any of the C++ 455 # headers 456 add_compile_flags_if_supported(-nostdinc++) 457 458 # Hide all inline function definitions which have not explicitly been marked 459 # visible. This prevents new definitions for inline functions from appearing in 460 # the dylib when get ODR used by another function. 461 add_compile_flags_if_supported(-fvisibility-inlines-hidden) 462 463 if (LIBCXX_CONFIGURE_IDE) 464 # This simply allows IDE to process <experimental/coroutine> 465 add_compile_flags_if_supported(-fcoroutines-ts) 466 endif() 467 468 # Let the library headers know they are currently being used to build the 469 # library. 470 add_definitions(-D_LIBCPP_BUILDING_LIBRARY) 471 472 if (NOT LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS) 473 add_definitions(-D_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS) 474 endif() 475 476 # Warning flags =============================================================== 477 add_definitions(-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 478 add_compile_flags_if_supported( 479 -Wall -Wextra -W -Wwrite-strings 480 -Wno-unused-parameter -Wno-long-long 481 -Werror=return-type) 482 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") 483 add_compile_flags_if_supported( 484 -Wno-user-defined-literals 485 -Wno-covered-switch-default) 486 elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") 487 add_compile_flags_if_supported( 488 -Wno-literal-suffix 489 -Wno-c++14-compat 490 -Wno-noexcept-type) 491 endif() 492 if (LIBCXX_ENABLE_WERROR) 493 add_compile_flags_if_supported(-Werror) 494 add_compile_flags_if_supported(-WX) 495 else() 496 # TODO(EricWF) Remove this. We shouldn't be suppressing errors when -Werror is 497 # added elsewhere. 498 add_compile_flags_if_supported(-Wno-error) 499 endif() 500 if (LIBCXX_ENABLE_PEDANTIC) 501 add_compile_flags_if_supported(-pedantic) 502 endif() 503 if (LIBCXX_DISABLE_MACRO_CONFLICT_WARNINGS) 504 add_definitions(-D_LIBCPP_DISABLE_MACRO_CONFLICT_WARNINGS) 505 endif() 506 507 # Exception flags ============================================================= 508 if (LIBCXX_ENABLE_EXCEPTIONS) 509 # Catches C++ exceptions only and tells the compiler to assume that extern C 510 # functions never throw a C++ exception. 511 add_compile_flags_if_supported(-EHsc) 512 else() 513 add_definitions(-D_LIBCPP_NO_EXCEPTIONS) 514 add_compile_flags_if_supported(-EHs- -EHa-) 515 add_compile_flags_if_supported(-fno-exceptions) 516 endif() 517 518 # RTTI flags ================================================================== 519 if (NOT LIBCXX_ENABLE_RTTI) 520 add_definitions(-D_LIBCPP_NO_RTTI) 521 add_compile_flags_if_supported(-GR-) 522 add_compile_flags_if_supported(-fno-rtti) 523 endif() 524 525 # Threading flags ============================================================= 526 if (LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY AND LIBCXX_ENABLE_SHARED) 527 # Need to allow unresolved symbols if this is to work with shared library builds 528 if (APPLE) 529 add_link_flags("-undefined dynamic_lookup") 530 else() 531 # Relax this restriction from HandleLLVMOptions 532 string(REPLACE "-Wl,-z,defs" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}") 533 endif() 534 endif() 535 536 # Assertion flags ============================================================= 537 define_if(LIBCXX_ENABLE_ASSERTIONS -UNDEBUG) 538 define_if_not(LIBCXX_ENABLE_ASSERTIONS -DNDEBUG) 539 define_if(LIBCXX_ENABLE_ASSERTIONS -D_LIBCPP_DEBUG=0) 540 define_if(LIBCXX_DEBUG_BUILD -D_DEBUG) 541 if (LIBCXX_ENABLE_ASSERTIONS AND NOT LIBCXX_DEBUG_BUILD) 542 # MSVC doesn't like _DEBUG on release builds. See PR 4379. 543 define_if_not(LIBCXX_TARGETING_MSVC -D_DEBUG) 544 endif() 545 546 # Modules flags =============================================================== 547 # FIXME The libc++ sources are fundamentally non-modular. They need special 548 # versions of the headers in order to provide C++03 and legacy ABI definitions. 549 # NOTE: The public headers can be used with modules in all other contexts. 550 if (LLVM_ENABLE_MODULES) 551 # Ignore that the rest of the modules flags are now unused. 552 add_compile_flags_if_supported(-Wno-unused-command-line-argument) 553 add_compile_flags(-fno-modules) 554 endif() 555 556 # Sanitizer flags ============================================================= 557 558 # Configure for sanitizers. If LIBCXX_STANDALONE_BUILD then we have to do 559 # the flag translation ourselves. Othewise LLVM's CMakeList.txt will handle it. 560 if (LIBCXX_STANDALONE_BUILD) 561 set(LLVM_USE_SANITIZER "" CACHE STRING 562 "Define the sanitizer used to build the library and tests") 563 # NOTE: LLVM_USE_SANITIZER checks for a UNIX like system instead of MSVC. 564 # But we don't have LLVM_ON_UNIX so checking for MSVC is the best we can do. 565 if (LLVM_USE_SANITIZER AND NOT MSVC) 566 add_flags_if_supported("-fno-omit-frame-pointer") 567 add_flags_if_supported("-gline-tables-only") 568 569 if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG" AND 570 NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO") 571 add_flags_if_supported("-gline-tables-only") 572 endif() 573 if (LLVM_USE_SANITIZER STREQUAL "Address") 574 add_flags("-fsanitize=address") 575 elseif (LLVM_USE_SANITIZER MATCHES "Memory(WithOrigins)?") 576 add_flags(-fsanitize=memory) 577 if (LLVM_USE_SANITIZER STREQUAL "MemoryWithOrigins") 578 add_flags("-fsanitize-memory-track-origins") 579 endif() 580 elseif (LLVM_USE_SANITIZER STREQUAL "Undefined") 581 add_flags("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all") 582 elseif (LLVM_USE_SANITIZER STREQUAL "Thread") 583 add_flags(-fsanitize=thread) 584 else() 585 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}") 586 endif() 587 elseif(LLVM_USE_SANITIZER AND MSVC) 588 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.") 589 endif() 590 endif() 591 592 # Configuration file flags ===================================================== 593 if (NOT LIBCXX_ABI_VERSION EQUAL "1") 594 config_define(${LIBCXX_ABI_VERSION} _LIBCPP_ABI_VERSION) 595 endif() 596 config_define_if(LIBCXX_ABI_UNSTABLE _LIBCPP_ABI_UNSTABLE) 597 598 config_define_if_not(LIBCXX_ENABLE_GLOBAL_FILESYSTEM_NAMESPACE _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE) 599 config_define_if_not(LIBCXX_ENABLE_STDIN _LIBCPP_HAS_NO_STDIN) 600 config_define_if_not(LIBCXX_ENABLE_STDOUT _LIBCPP_HAS_NO_STDOUT) 601 config_define_if_not(LIBCXX_ENABLE_THREADS _LIBCPP_HAS_NO_THREADS) 602 config_define_if_not(LIBCXX_ENABLE_MONOTONIC_CLOCK _LIBCPP_HAS_NO_MONOTONIC_CLOCK) 603 config_define_if_not(LIBCXX_ENABLE_THREAD_UNSAFE_C_FUNCTIONS _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS) 604 605 config_define_if(LIBCXX_HAS_PTHREAD_API _LIBCPP_HAS_THREAD_API_PTHREAD) 606 config_define_if(LIBCXX_HAS_EXTERNAL_THREAD_API _LIBCPP_HAS_THREAD_API_EXTERNAL) 607 config_define_if(LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY _LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL) 608 config_define_if(LIBCXX_HAS_MUSL_LIBC _LIBCPP_HAS_MUSL_LIBC) 609 610 # By default libc++ on Windows expects to use a shared library, which requires 611 # the headers to use DLL import/export semantics. However when building a 612 # static library only we modify the headers to disable DLL import/export. 613 if (DEFINED WIN32 AND LIBCXX_ENABLE_STATIC AND NOT LIBCXX_ENABLE_SHARED) 614 message(STATUS "Generating custom __config for non-DLL Windows build") 615 config_define(ON _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 616 endif() 617 618 if (LIBCXX_NEEDS_SITE_CONFIG) 619 configure_file("include/__config_site.in" 620 "${LIBCXX_BINARY_DIR}/__config_site" 621 @ONLY) 622 623 # Provide the config definitions by included the generated __config_site 624 # file at compile time. 625 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" OR "${CMAKE_CXX_SIMULATE_ID}" STREQUAL "MSVC") 626 add_compile_flags("/FI\"${LIBCXX_BINARY_DIR}/__config_site\"") 627 else() 628 add_compile_flags("-include ${LIBCXX_BINARY_DIR}/__config_site") 629 endif() 630 endif() 631 632 #=============================================================================== 633 # Setup Source Code And Tests 634 #=============================================================================== 635 include_directories(include) 636 add_subdirectory(include) 637 add_subdirectory(lib) 638 639 640 if (LIBCXX_INCLUDE_BENCHMARKS) 641 add_subdirectory(benchmarks) 642 endif() 643 644 # Create the lit.site.cfg file even when LIBCXX_INCLUDE_TESTS is OFF or 645 # LLVM_FOUND is OFF. This allows users to run the tests manually using 646 # LIT without requiring a full LLVM checkout. 647 # 648 # However, since some submission systems strip test/ subdirectories, check for 649 # it before adding it. 650 if(IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/test") 651 add_subdirectory(test) 652 endif() 653 if (LIBCXX_INCLUDE_TESTS) 654 add_subdirectory(lib/abi) 655 endif() 656 657 if (LIBCXX_INCLUDE_DOCS) 658 add_subdirectory(docs) 659 endif() 660
