| #=============================================================================== |
| # Define targets for linking against the selected ABI library |
| # |
| # After including this file, the following targets are defined: |
| # - libcxx-abi-headers: An interface target that allows getting access to the |
| # headers of the selected ABI library. |
| # - libcxx-abi-shared: A target representing the selected shared ABI library. |
| # - libcxx-abi-static: A target representing the selected static ABI library. |
| # |
| # Furthermore, some ABI libraries also define the following target: |
| # - libcxx-abi-shared-objects: An object library representing a set of object files |
| # constituting the ABI library, suitable for bundling |
| # into a shared library. |
| # - libcxx-abi-static-objects: An object library representing a set of object files |
| # constituting the ABI library, suitable for bundling |
| # into a static library. |
| #=============================================================================== |
| |
| include(GNUInstallDirs) |
| |
| # This function copies the provided headers to a private directory and adds that |
| # path to the given INTERFACE target. That target can then be linked against to |
| # get access to those headers (and only those). |
| # |
| # The problem this solves is that when building against a system-provided ABI library, |
| # the ABI headers might live side-by-side with an actual C++ Standard Library |
| # installation. For that reason, we can't just add `-I <path-to-ABI-headers>`, |
| # since we would end up also adding the system-provided C++ Standard Library to |
| # the search path. Instead, what we do is copy just the ABI library headers to |
| # a private directory and add just that path when we build libc++. |
| function(import_private_headers target include_dirs headers) |
| foreach(header ${headers}) |
| set(found FALSE) |
| foreach(incpath ${include_dirs}) |
| if (EXISTS "${incpath}/${header}") |
| set(found TRUE) |
| message(STATUS "Looking for ${header} in ${incpath} - found") |
| get_filename_component(dstdir ${header} PATH) |
| get_filename_component(header_file ${header} NAME) |
| set(src ${incpath}/${header}) |
| set(dst "${LIBCXX_BINARY_DIR}/private-abi-headers/${dstdir}/${header_file}") |
| |
| add_custom_command(OUTPUT ${dst} |
| DEPENDS ${src} |
| COMMAND ${CMAKE_COMMAND} -E make_directory "${LIBCXX_BINARY_DIR}/private-abi-headers/${dstdir}" |
| COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst} |
| COMMENT "Copying C++ ABI header ${header}") |
| list(APPEND abilib_headers "${dst}") |
| else() |
| message(STATUS "Looking for ${header} in ${incpath} - not found") |
| endif() |
| endforeach() |
| if (NOT found) |
| message(WARNING "Failed to find ${header} in ${include_dirs}") |
| endif() |
| endforeach() |
| |
| # Work around https://gitlab.kitware.com/cmake/cmake/-/issues/18399 |
| add_library(${target}-generate-private-headers OBJECT ${abilib_headers}) |
| set_target_properties(${target}-generate-private-headers PROPERTIES LINKER_LANGUAGE CXX) |
| |
| target_link_libraries(${target} INTERFACE ${target}-generate-private-headers) |
| target_include_directories(${target} INTERFACE "${LIBCXX_BINARY_DIR}/private-abi-headers") |
| endfunction() |
| |
| # This function creates an imported static library named <target>. |
| # It imports a library named <name> searched at the given <path>. |
| function(import_static_library target path name) |
| add_library(${target} STATIC IMPORTED GLOBAL) |
| find_library(file |
| NAMES "${CMAKE_STATIC_LIBRARY_PREFIX}${name}${CMAKE_STATIC_LIBRARY_SUFFIX}" |
| PATHS "${path}" |
| NO_CACHE) |
| set_target_properties(${target} PROPERTIES IMPORTED_LOCATION "${file}") |
| endfunction() |
| |
| # This function creates an imported shared (interface) library named <target> |
| # for the given library <name>. |
| function(import_shared_library target name) |
| add_library(${target} INTERFACE IMPORTED GLOBAL) |
| set_target_properties(${target} PROPERTIES IMPORTED_LIBNAME "${name}") |
| endfunction() |
| |
| # Link against a system-provided libstdc++ |
| if ("${LIBCXX_CXX_ABI}" STREQUAL "libstdc++") |
| add_library(libcxx-abi-headers INTERFACE) |
| import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}" |
| "cxxabi.h;bits/c++config.h;bits/os_defines.h;bits/cpu_defines.h;bits/cxxabi_tweaks.h;bits/cxxabi_forced.h") |
| target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBSTDCXX" "-D__GLIBCXX__") |
| |
| import_shared_library(libcxx-abi-shared stdc++) |
| target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers) |
| |
| import_static_library(libcxx-abi-static "${LIBCXX_CXX_ABI_LIBRARY_PATH}" stdc++) |
| target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers) |
| |
| # Link against a system-provided libsupc++ |
| elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libsupc++") |
| add_library(libcxx-abi-headers INTERFACE) |
| import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}" |
| "cxxabi.h;bits/c++config.h;bits/os_defines.h;bits/cpu_defines.h;bits/cxxabi_tweaks.h;bits/cxxabi_forced.h") |
| target_compile_definitions(libcxx-abi-headers INTERFACE "-D__GLIBCXX__") |
| |
| import_shared_library(libcxx-abi-shared supc++) |
| target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers) |
| |
| import_static_library(libcxx-abi-static "${LIBCXX_CXX_ABI_LIBRARY_PATH}" supc++) |
| target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers) |
| |
| # Link against the in-tree libc++abi |
| elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxabi") |
| add_library(libcxx-abi-headers INTERFACE) |
| target_link_libraries(libcxx-abi-headers INTERFACE cxxabi-headers) |
| target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBCXX_BUILDING_LIBCXXABI") |
| |
| if (TARGET cxxabi_shared) |
| add_library(libcxx-abi-shared ALIAS cxxabi_shared) |
| endif() |
| |
| if (TARGET cxxabi_static) |
| add_library(libcxx-abi-static ALIAS cxxabi_static) |
| endif() |
| |
| if (TARGET cxxabi_shared_objects) |
| add_library(libcxx-abi-shared-objects ALIAS cxxabi_shared_objects) |
| endif() |
| |
| if (TARGET cxxabi_static_objects) |
| add_library(libcxx-abi-static-objects ALIAS cxxabi_static_objects) |
| endif() |
| |
| # Link against a system-provided libc++abi |
| elseif ("${LIBCXX_CXX_ABI}" STREQUAL "system-libcxxabi") |
| add_library(libcxx-abi-headers INTERFACE) |
| import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}" "cxxabi.h;__cxxabi_config.h") |
| target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBCXX_BUILDING_LIBCXXABI") |
| |
| import_shared_library(libcxx-abi-shared c++abi) |
| target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers) |
| |
| import_static_library(libcxx-abi-static "${LIBCXX_CXX_ABI_LIBRARY_PATH}" c++abi) |
| target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers) |
| |
| # Link against a system-provided libcxxrt |
| elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxrt") |
| if(NOT LIBCXX_CXX_ABI_INCLUDE_PATHS) |
| message(STATUS "LIBCXX_CXX_ABI_INCLUDE_PATHS not set, using /usr/include/c++/v1") |
| set(LIBCXX_CXX_ABI_INCLUDE_PATHS "/usr/include/c++/v1") |
| endif() |
| add_library(libcxx-abi-headers INTERFACE) |
| import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}" |
| "cxxabi.h;unwind.h;unwind-arm.h;unwind-itanium.h") |
| target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBCXXRT") |
| |
| import_shared_library(libcxx-abi-shared cxxrt) |
| target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers) |
| |
| import_static_library(libcxx-abi-static "${LIBCXX_CXX_ABI_LIBRARY_PATH}" cxxrt) |
| target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers) |
| |
| # Link against a system-provided vcruntime |
| # FIXME: Figure out how to configure the ABI library on Windows. |
| elseif ("${LIBCXX_CXX_ABI}" STREQUAL "vcruntime") |
| add_library(libcxx-abi-headers INTERFACE) |
| add_library(libcxx-abi-shared INTERFACE) |
| add_library(libcxx-abi-static INTERFACE) |
| |
| # Don't link against any ABI library |
| elseif ("${LIBCXX_CXX_ABI}" STREQUAL "none") |
| add_library(libcxx-abi-headers INTERFACE) |
| target_compile_definitions(libcxx-abi-headers INTERFACE "-D_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY") |
| |
| add_library(libcxx-abi-shared INTERFACE) |
| target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers) |
| |
| add_library(libcxx-abi-static INTERFACE) |
| target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers) |
| endif() |