1 # See www/CMake.html for instructions on how to build libcxx with CMake.
3 #===============================================================================
5 #===============================================================================
6 cmake_minimum_required(VERSION 3.4.3)
9 cmake_policy(SET CMP0042 NEW) # Set MACOSX_RPATH=YES by default
12 cmake_policy(SET CMP0022 NEW) # Required when interacting with LLVM and Clang
15 # Add path for custom modules
17 "${CMAKE_CURRENT_SOURCE_DIR}/cmake"
18 "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules"
22 if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
25 set(PACKAGE_NAME libcxx)
26 set(PACKAGE_VERSION 5.0.0)
27 set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
28 set(PACKAGE_BUGREPORT "llvm-bugs@lists.llvm.org")
30 # Find the LLVM sources and simulate LLVM CMake options.
31 include(HandleOutOfTreeLLVM)
34 if (LIBCXX_STANDALONE_BUILD)
35 include(FindPythonInterp)
36 if( NOT PYTHONINTERP_FOUND )
37 message(WARNING "Failed to find python interpreter. "
38 "The libc++ test suite will be disabled.")
39 set(LLVM_INCLUDE_TESTS OFF)
43 # Require out of source build.
44 include(MacroEnsureOutOfSourceBuild)
45 MACRO_ENSURE_OUT_OF_SOURCE_BUILD(
46 "${PROJECT_NAME} requires an out of source build. Please create a separate
47 build directory and run 'cmake /path/to/${PROJECT_NAME} [options]' there."
51 set(LIBCXX_TARGETING_MSVC ON)
53 set(LIBCXX_TARGETING_MSVC OFF)
56 #===============================================================================
58 #===============================================================================
59 include(CMakeDependentOption)
60 include(HandleCompilerRT)
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})
69 set(ENABLE_FILESYSTEM_DEFAULT OFF)
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." ${LLVM_INCLUDE_TESTS})
75 # Benchmark options -----------------------------------------------------------
76 option(LIBCXX_INCLUDE_BENCHMARKS "Build the libc++ benchmarks and their dependancies" ON)
77 set(LIBCXX_BENCHMARK_NATIVE_STDLIB "" CACHE STRING
78 "Build the benchmarks against the specified native STL.
79 The value must be one of libc++/libstdc++")
80 set(LIBCXX_BENCHMARK_NATIVE_GCC_TOOLCHAIN "" CACHE STRING
81 "Use alternate GCC toolchain when building the native benchmarks")
83 if (LIBCXX_BENCHMARK_NATIVE_STDLIB)
84 if (NOT (LIBCXX_BENCHMARK_NATIVE_STDLIB STREQUAL "libc++"
85 OR LIBCXX_BENCHMARK_NATIVE_STDLIB STREQUAL "libstdc++"))
86 message(FATAL_ERROR "Invalid value for LIBCXX_BENCHMARK_NATIVE_STDLIB: "
87 "'${LIBCXX_BENCHMARK_NATIVE_STDLIB}'")
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)
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.")
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})
114 # Setup the default options if LIBCXX_CXX_ABI is not specified.
115 if (LIBCXX_CXX_ABI STREQUAL "default")
117 LIBCXX_LIBCXXABI_INCLUDES_INTERNAL
119 PATHS ${LLVM_MAIN_SRC_DIR}/projects/libcxxabi/include
120 ${LLVM_MAIN_SRC_DIR}/runtimes/libcxxabi/include
121 ${LLVM_MAIN_SRC_DIR}/../libcxxabi/include
124 if (LIBCXX_TARGETING_MSVC)
125 # FIXME: Figure out how to configure the ABI library on Windows.
126 set(LIBCXX_CXX_ABI_LIBNAME "vcruntime")
127 elseif ((NOT LIBCXX_STANDALONE_BUILD OR HAVE_LIBCXXABI) AND
128 IS_DIRECTORY "${LIBCXX_LIBCXXABI_INCLUDES_INTERNAL}")
129 set(LIBCXX_CXX_ABI_LIBNAME "libcxxabi")
130 set(LIBCXX_CXX_ABI_INCLUDE_PATHS "${LIBCXX_LIBCXXABI_INCLUDES_INTERNAL}")
131 set(LIBCXX_CXX_ABI_INTREE 1)
133 set(LIBCXX_CXX_ABI_LIBNAME "libcxxabi")
134 set(LIBCXX_CXX_ABI_SYSTEM 1)
136 set(LIBCXX_CXX_ABI_LIBNAME "default")
139 set(LIBCXX_CXX_ABI_LIBNAME "${LIBCXX_CXX_ABI}")
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)
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)
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})
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
171 set(ENABLE_NEW_DELETE_DEFAULT ON)
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})
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)
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.")
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)
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)
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")
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.
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)
237 set(LIBCXX_CONFIGURE_IDE_DEFAULT OFF)
238 if (XCODE OR MSVC_IDE)
239 set(LIBCXX_CONFIGURE_IDE_DEFAULT ON)
241 option(LIBCXX_CONFIGURE_IDE "Configure libcxx for use within an IDE"
242 ${LIBCXX_CONFIGURE_IDE_DEFAULT})
244 #===============================================================================
245 # Check option configurations
246 #===============================================================================
248 if (LIBCXX_ENABLE_FILESYSTEM AND NOT LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
250 "LIBCXX_ENABLE_FILESYSTEM cannot be turned on when LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF")
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.")
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.")
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.")
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.")
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 "
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.")
289 # Ensure LLVM_USE_SANITIZER is not specified when LIBCXX_GENERATE_COVERAGE
291 if (LLVM_USE_SANITIZER AND LIBCXX_GENERATE_COVERAGE)
292 message(FATAL_ERROR "LLVM_USE_SANITIZER cannot be used with LIBCXX_GENERATE_COVERAGE")
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.")
301 elseif(LIBCXX_BUILD_32_BITS)
302 message(FATAL_ERROR "LIBCXX_BUILD_32_BITS=ON is not supported on this platform.")
305 # Check that this option is not enabled on Apple and emit a usage warning.
306 if (LIBCXX_ENABLE_STATIC_ABI_LIBRARY)
308 message(FATAL_ERROR "LIBCXX_ENABLE_STATIC_ABI_LIBRARY is not supported on OS X")
310 message(WARNING "LIBCXX_ENABLE_STATIC_ABI_LIBRARY is an experimental option")
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.")
317 if (LIBCXX_ENABLE_ABI_LINKER_SCRIPT)
319 message(FATAL_ERROR "LIBCXX_ENABLE_ABI_LINKER_SCRIPT cannot be used on APPLE targets")
321 if (NOT PYTHONINTERP_FOUND)
322 message(FATAL_ERROR "LIBCXX_ENABLE_ABI_LINKER_SCRIPT requires python but it was not found.")
324 if (NOT LIBCXX_ENABLE_SHARED)
325 message(FATAL_ERROR "LIBCXX_ENABLE_ABI_LINKER_SCRIPT is only available for shared library builds.")
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")
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.")
340 #===============================================================================
342 #===============================================================================
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})
351 set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX})
353 file(MAKE_DIRECTORY "${LIBCXX_BINARY_INCLUDE_DIR}")
355 set(LIBCXX_INSTALL_PREFIX "" CACHE STRING
356 "Define libc++ destination prefix.")
358 if (NOT LIBCXX_INSTALL_PREFIX MATCHES "^$|.*/")
359 message(FATAL_ERROR "LIBCXX_INSTALL_PREFIX has to end with \"/\".")
362 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBCXX_LIBRARY_DIR})
363 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LIBCXX_LIBRARY_DIR})
364 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LIBCXX_LIBRARY_DIR})
366 # Declare libc++ configuration variables.
367 # They are intended for use as follows:
368 # LIBCXX_CXX_FLAGS: General flags for both the compiler and linker.
369 # LIBCXX_COMPILE_FLAGS: Compile only flags.
370 # LIBCXX_LINK_FLAGS: Linker only flags.
371 # LIBCXX_LIBRARIES: libraries libc++ is linked to.
372 # LIBCXX_INTERFACE_LIBRARIES: Libraries that must be linked when using libc++
373 # These libraries are exposed in the linker script.
374 set(LIBCXX_COMPILE_FLAGS "")
375 set(LIBCXX_LINK_FLAGS "")
376 set(LIBCXX_LIBRARIES "")
377 set(LIBCXX_INTERFACE_LIBRARIES "")
379 # Include macros for adding and removing libc++ flags.
380 include(HandleLibcxxFlags)
382 # Target flags ================================================================
383 # These flags get added to CMAKE_CXX_FLAGS and CMAKE_C_FLAGS so that
384 # 'config-ix' use them during feature checks. It also adds them to both
385 # 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'
386 add_target_flags_if(LIBCXX_BUILD_32_BITS "-m32")
387 add_target_flags_if(LIBCXX_TARGET_TRIPLE "--target=${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 "${LIBCXX_TARGET_TRIPLE}")
394 # Configure compiler.
397 if (LIBCXX_USE_COMPILER_RT)
398 list(APPEND LIBCXX_LINK_FLAGS "-rtlib=compiler-rt")
401 # Configure coverage options.
402 if (LIBCXX_GENERATE_COVERAGE)
403 include(CodeCoverage)
404 set(CMAKE_BUILD_TYPE "COVERAGE" CACHE STRING "" FORCE)
407 string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
408 if (uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
409 set(LIBCXX_DEBUG_BUILD ON)
411 set(LIBCXX_DEBUG_BUILD OFF)
414 #===============================================================================
415 # Setup Compiler Flags
416 #===============================================================================
418 include(HandleLibCXXABI) # Setup the ABI library flags
420 if (NOT LIBCXX_STANDALONE_BUILD)
421 # Remove flags that may have snuck in.
422 remove_flags(-DNDEBUG -UNDEBUG -D_DEBUG
425 remove_flags(-stdlib=libc++ -stdlib=libstdc++)
427 # FIXME: Remove all debug flags and flags that change which Windows
428 # default libraries are linked. Currently we only support linking the
430 remove_flags("/D_DEBUG" "/MTd" "/MDd" "/MT" "/Md")
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)
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")
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 ${LIBCXX_STANDARD_VER}")
452 # On all systems the system c++ standard library headers need to be excluded.
453 # MSVC only has -X, which disables all default includes; including the crt.
454 # Thus, we do nothing and hope we don't accidentally include any of the C++
456 add_compile_flags_if_supported(-nostdinc++)
458 # Hide all inline function definitions which have not explicitly been marked
459 # visible. This prevents new definitions for inline functions from appearing in
460 # the dylib when get ODR used by another function.
461 add_compile_flags_if_supported(-fvisibility-inlines-hidden)
463 if (LIBCXX_CONFIGURE_IDE)
464 # This simply allows IDE to process <experimental/coroutine>
465 add_compile_flags_if_supported(-fcoroutines-ts)
468 # Let the library headers know they are currently being used to build the
470 add_definitions(-D_LIBCPP_BUILDING_LIBRARY)
472 if (NOT LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS)
473 add_definitions(-D_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS)
476 # Warning flags ===============================================================
477 add_definitions(-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
478 add_compile_flags_if_supported(
479 -Wall -Wextra -W -Wwrite-strings
480 -Wno-unused-parameter -Wno-long-long
482 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
483 add_compile_flags_if_supported(
484 -Wno-user-defined-literals
485 -Wno-covered-switch-default)
486 elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
487 add_compile_flags_if_supported(
492 if (LIBCXX_ENABLE_WERROR)
493 add_compile_flags_if_supported(-Werror)
494 add_compile_flags_if_supported(-WX)
496 # TODO(EricWF) Remove this. We shouldn't be suppressing errors when -Werror is
498 add_compile_flags_if_supported(-Wno-error)
500 if (LIBCXX_ENABLE_PEDANTIC)
501 add_compile_flags_if_supported(-pedantic)
503 if (LIBCXX_DISABLE_MACRO_CONFLICT_WARNINGS)
504 add_definitions(-D_LIBCPP_DISABLE_MACRO_CONFLICT_WARNINGS)
507 # Exception flags =============================================================
508 if (LIBCXX_ENABLE_EXCEPTIONS)
509 # Catches C++ exceptions only and tells the compiler to assume that extern C
510 # functions never throw a C++ exception.
511 add_compile_flags_if_supported(-EHsc)
513 add_definitions(-D_LIBCPP_NO_EXCEPTIONS)
514 add_compile_flags_if_supported(-EHs- -EHa-)
515 add_compile_flags_if_supported(-fno-exceptions)
518 # RTTI flags ==================================================================
519 if (NOT LIBCXX_ENABLE_RTTI)
520 add_definitions(-D_LIBCPP_NO_RTTI)
521 add_compile_flags_if_supported(-GR-)
522 add_compile_flags_if_supported(-fno-rtti)
525 # Threading flags =============================================================
526 if (LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY AND LIBCXX_ENABLE_SHARED)
527 # Need to allow unresolved symbols if this is to work with shared library builds
529 add_link_flags("-undefined dynamic_lookup")
531 # Relax this restriction from HandleLLVMOptions
532 string(REPLACE "-Wl,-z,defs" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
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)
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)
556 # Sanitizer flags =============================================================
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")
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")
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")
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)
585 message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${LLVM_USE_SANITIZER}")
587 elseif(LLVM_USE_SANITIZER AND MSVC)
588 message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
592 # Configuration file flags =====================================================
593 if (NOT LIBCXX_ABI_VERSION EQUAL "1")
594 config_define(${LIBCXX_ABI_VERSION} _LIBCPP_ABI_VERSION)
596 config_define_if(LIBCXX_ABI_UNSTABLE _LIBCPP_ABI_UNSTABLE)
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)
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)
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)
618 if (LIBCXX_NEEDS_SITE_CONFIG)
619 configure_file("include/__config_site.in"
620 "${LIBCXX_BINARY_DIR}/__config_site"
623 # Provide the config definitions by included the generated __config_site
624 # file at compile time.
625 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" OR "${CMAKE_CXX_SIMULATE_ID}" STREQUAL "MSVC")
626 add_compile_flags("/FI\"${LIBCXX_BINARY_DIR}/__config_site\"")
628 add_compile_flags("-include ${LIBCXX_BINARY_DIR}/__config_site")
632 #===============================================================================
633 # Setup Source Code And Tests
634 #===============================================================================
635 include_directories(include)
636 add_subdirectory(include)
637 add_subdirectory(lib)
640 if (LIBCXX_INCLUDE_BENCHMARKS)
641 add_subdirectory(benchmarks)
644 # Create the lit.site.cfg file even when LIBCXX_INCLUDE_TESTS is OFF or
645 # LLVM_FOUND is OFF. This allows users to run the tests manually using
646 # LIT without requiring a full LLVM checkout.
648 # However, since some submission systems strip test/ subdirectories, check for
649 # it before adding it.
650 if(IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/test")
651 add_subdirectory(test)
653 if (LIBCXX_INCLUDE_TESTS)
654 add_subdirectory(lib/abi)
657 if (LIBCXX_INCLUDE_DOCS)
658 add_subdirectory(docs)