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#===============================================================================
# Add an ABI library if appropriate
#===============================================================================
#
# _setup_abi: Set up the build to use an ABI library
#
# Parameters:
# abidefines: A list of defines needed to compile libc++ with the ABI library
# abilib : The ABI library to link against.
# abifiles : A list of files (which may be relative paths) to copy into the
# libc++ build tree for the build. These files will be copied
# twice: once into include/, so the libc++ build itself can find
# them, and once into include/c++/v1, so that a clang built into
# the same build area will find them. These files will also be
# installed alongside the libc++ headers.
# abidirs : A list of relative paths to create under an include directory
# in the libc++ build directory.
#
macro(setup_abi_lib abidefines abilib abifiles abidirs)
list(APPEND LIBCXX_COMPILE_FLAGS ${abidefines})
set(LIBCXX_CXX_ABI_INCLUDE_PATHS "${LIBCXX_CXX_ABI_INCLUDE_PATHS}"
CACHE PATH
"Paths to C++ ABI header directories separated by ';'." FORCE
)
set(LIBCXX_CXX_ABI_LIBRARY_PATH "${LIBCXX_CXX_ABI_LIBRARY_PATH}"
CACHE PATH
"Paths to C++ ABI library directory"
)
set(LIBCXX_CXX_ABI_LIBRARY ${abilib})
set(LIBCXX_ABILIB_FILES ${abifiles})
foreach(fpath ${LIBCXX_ABILIB_FILES})
set(found FALSE)
foreach(incpath ${LIBCXX_CXX_ABI_INCLUDE_PATHS})
if (EXISTS "${incpath}/${fpath}")
set(found TRUE)
get_filename_component(dstdir ${fpath} PATH)
get_filename_component(ifile ${fpath} NAME)
set(src ${incpath}/${fpath})
set(dst ${LIBCXX_BINARY_INCLUDE_DIR}/${dstdir}/${fpath})
add_custom_command(OUTPUT ${dst}
DEPENDS ${src}
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
COMMENT "Copying C++ ABI header ${fpath}...")
list(APPEND abilib_headers "${dst}")
if (NOT LIBCXX_USING_INSTALLED_LLVM AND LIBCXX_HEADER_DIR)
set(dst "${LIBCXX_HEADER_DIR}/include/c++/v1/${dstdir}/${fpath}")
add_custom_command(OUTPUT ${dst}
DEPENDS ${src}
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
COMMENT "Copying C++ ABI header ${fpath}...")
list(APPEND abilib_headers "${dst}")
endif()
if (LIBCXX_INSTALL_HEADERS)
install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dstdir}
COMPONENT cxx-headers
PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
)
endif()
endif()
endforeach()
if (NOT found)
message(WARNING "Failed to find ${fpath}")
endif()
endforeach()
include_directories("${LIBCXX_BINARY_INCLUDE_DIR}")
add_custom_target(cxx_abi_headers ALL DEPENDS ${abilib_headers})
set(LIBCXX_CXX_ABI_HEADER_TARGET "cxx_abi_headers")
endmacro()
# Configure based on the selected ABI library.
if ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libstdc++" OR
"${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libsupc++")
set(_LIBSUPCXX_INCLUDE_FILES
cxxabi.h bits/c++config.h bits/os_defines.h bits/cpu_defines.h
bits/cxxabi_tweaks.h bits/cxxabi_forced.h
)
if ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libstdc++")
set(_LIBSUPCXX_DEFINES "-DLIBSTDCXX")
set(_LIBSUPCXX_LIBNAME stdc++)
else()
set(_LIBSUPCXX_DEFINES "")
set(_LIBSUPCXX_LIBNAME supc++)
endif()
setup_abi_lib(
"-D__GLIBCXX__ ${_LIBSUPCXX_DEFINES}"
"${_LIBSUPCXX_LIBNAME}" "${_LIBSUPCXX_INCLUDE_FILES}" "bits"
)
elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxabi")
if (LIBCXX_CXX_ABI_INTREE)
# Link against just-built "cxxabi" target.
if (LIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY)
set(CXXABI_LIBNAME cxxabi_static)
else()
set(CXXABI_LIBNAME cxxabi_shared)
endif()
set(LIBCXX_LIBCPPABI_VERSION "2" PARENT_SCOPE)
else()
# Assume c++abi is installed in the system, rely on -lc++abi link flag.
set(CXXABI_LIBNAME "c++abi")
endif()
set(HEADERS "cxxabi.h;__cxxabi_config.h")
if (LIBCXX_CXX_ABI_SYSTEM)
set(HEADERS "")
endif()
setup_abi_lib("-DLIBCXX_BUILDING_LIBCXXABI" ${CXXABI_LIBNAME} "${HEADERS}" "")
elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxrt")
setup_abi_lib("-DLIBCXXRT"
"cxxrt" "cxxabi.h;unwind.h;unwind-arm.h;unwind-itanium.h" ""
)
elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "vcruntime")
# Nothing TODO
elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "none")
list(APPEND LIBCXX_COMPILE_FLAGS "-D_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY")
elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "default")
# Nothing TODO
else()
message(FATAL_ERROR
"Unsupported c++ abi: '${LIBCXX_CXX_ABI_LIBNAME}'. \
Currently libstdc++, libsupc++, libcxxabi, libcxxrt, default and none are
supported for c++ abi."
)
endif ()
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