ClickHouse/cmake/use_libcxx.cmake

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# Uses MAKE_STATIC_LIBRARIES
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package (Threads)
include (cmake/test_compiler.cmake)
include (cmake/arch.cmake)
if (OS_LINUX AND COMPILER_CLANG)
set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
option (USE_LIBCXX "Use libc++ and libc++abi instead of libstdc++ (only make sense on Linux with Clang)" ${HAVE_LIBCXX})
set (LIBCXX_PATH "" CACHE STRING "Use custom path for libc++. It should be used for MSan.")
if (USE_LIBCXX)
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++") # Ok for clang6, for older can cause 'not used option' warning
set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -D_LIBCPP_DEBUG=0") # More checks in debug build.
if (MAKE_STATIC_LIBRARIES)
execute_process (COMMAND ${CMAKE_CXX_COMPILER} --print-file-name=libclang_rt.builtins-${CMAKE_SYSTEM_PROCESSOR}.a OUTPUT_VARIABLE BUILTINS_LIB_PATH OUTPUT_STRIP_TRAILING_WHITESPACE)
link_libraries (-nodefaultlibs -Wl,-Bstatic -stdlib=libc++ c++ c++abi gcc_eh ${BUILTINS_LIB_PATH} rt -Wl,-Bdynamic dl pthread m c)
else ()
link_libraries (-stdlib=libc++ c++ c++abi)
endif ()
if (LIBCXX_PATH)
# include_directories (SYSTEM BEFORE "${LIBCXX_PATH}/include" "${LIBCXX_PATH}/include/c++/v1")
link_directories ("${LIBCXX_PATH}/lib")
endif ()
endif ()
endif ()
if (USE_LIBCXX)
set (STATIC_STDLIB_FLAGS "")
else ()
set (STATIC_STDLIB_FLAGS "-static-libgcc -static-libstdc++")
endif ()
if (MAKE_STATIC_LIBRARIES AND NOT APPLE AND NOT (COMPILER_CLANG AND OS_FREEBSD))
set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${STATIC_STDLIB_FLAGS}")
# Along with executables, we also build example of shared library for "library dictionary source"; and it also should be self-contained.
set (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${STATIC_STDLIB_FLAGS}")
endif ()
if (USE_STATIC_LIBRARIES AND HAVE_NO_PIE)
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${FLAG_NO_PIE}")
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${FLAG_NO_PIE}")
endif ()