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1#===============================================================================2# Define targets for linking against the selected ABI library3#4# After including this file, the following targets are defined:5# - libcxx-abi-headers: An interface target that allows getting access to the6# headers of the selected ABI library.7# - libcxx-abi-shared: A target representing the selected shared ABI library.8# - libcxx-abi-static: A target representing the selected static ABI library.9#10# Furthermore, some ABI libraries also define the following target:11# - libcxx-abi-shared-objects: An object library representing a set of object files12# constituting the ABI library, suitable for bundling13# into a shared library.14# - libcxx-abi-static-objects: An object library representing a set of object files15# constituting the ABI library, suitable for bundling16# into a static library.17#===============================================================================18 19include(GNUInstallDirs)20 21# This function copies the provided headers to a private directory and adds that22# path to the given INTERFACE target. That target can then be linked against to23# get access to those headers (and only those).24#25# The problem this solves is that when building against a system-provided ABI library,26# the ABI headers might live side-by-side with an actual C++ Standard Library27# installation. For that reason, we can't just add `-I <path-to-ABI-headers>`,28# since we would end up also adding the system-provided C++ Standard Library to29# the search path. Instead, what we do is copy just the ABI library headers to30# a private directory and add just that path when we build libc++.31function(import_private_headers target include_dirs headers)32 foreach(header ${headers})33 set(found FALSE)34 foreach(incpath ${include_dirs})35 if (EXISTS "${incpath}/${header}")36 set(found TRUE)37 message(STATUS "Looking for ${header} in ${incpath} - found")38 get_filename_component(dstdir ${header} PATH)39 get_filename_component(header_file ${header} NAME)40 set(src ${incpath}/${header})41 set(dst "${LIBCXX_BINARY_DIR}/private-abi-headers/${dstdir}/${header_file}")42 43 add_custom_command(OUTPUT ${dst}44 DEPENDS ${src}45 COMMAND ${CMAKE_COMMAND} -E make_directory "${LIBCXX_BINARY_DIR}/private-abi-headers/${dstdir}"46 COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}47 COMMENT "Copying C++ ABI header ${header}")48 list(APPEND abilib_headers "${dst}")49 else()50 message(STATUS "Looking for ${header} in ${incpath} - not found")51 endif()52 endforeach()53 if (NOT found)54 message(WARNING "Failed to find ${header} in ${include_dirs}")55 endif()56 endforeach()57 58 # Work around https://gitlab.kitware.com/cmake/cmake/-/issues/1839959 add_library(${target}-generate-private-headers OBJECT ${abilib_headers})60 set_target_properties(${target}-generate-private-headers PROPERTIES LINKER_LANGUAGE CXX)61 62 target_link_libraries(${target} INTERFACE ${target}-generate-private-headers)63 target_include_directories(${target} INTERFACE "${LIBCXX_BINARY_DIR}/private-abi-headers")64endfunction()65 66# This function creates an imported static library named <target>.67# It imports a library named <name> searched at the given <path>.68function(import_static_library target path name)69 add_library(${target} STATIC IMPORTED GLOBAL)70 find_library(file71 NAMES "${CMAKE_STATIC_LIBRARY_PREFIX}${name}${CMAKE_STATIC_LIBRARY_SUFFIX}"72 PATHS "${path}"73 NO_CACHE)74 set_target_properties(${target} PROPERTIES IMPORTED_LOCATION "${file}")75endfunction()76 77# This function creates an imported shared (interface) library named <target>78# for the given library <name>.79function(import_shared_library target name)80 add_library(${target} INTERFACE IMPORTED GLOBAL)81 set_target_properties(${target} PROPERTIES IMPORTED_LIBNAME "${name}")82endfunction()83 84# Link against a system-provided libstdc++85if ("${LIBCXX_CXX_ABI}" STREQUAL "libstdc++")86 if(NOT LIBCXX_CXX_ABI_INCLUDE_PATHS)87 message(FATAL_ERROR "LIBCXX_CXX_ABI_INCLUDE_PATHS must be set when selecting libstdc++ as an ABI library")88 endif()89 90 add_library(libcxx-abi-headers INTERFACE)91 import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}"92 "cxxabi.h;bits/c++config.h;bits/os_defines.h;bits/cpu_defines.h;bits/cxxabi_tweaks.h;bits/cxxabi_forced.h")93 target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBSTDCXX" "-D__GLIBCXX__")94 95 import_shared_library(libcxx-abi-shared stdc++)96 target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)97 98 import_static_library(libcxx-abi-static "${LIBCXX_CXX_ABI_LIBRARY_PATH}" stdc++)99 target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)100 101# Link against a system-provided libsupc++102elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libsupc++")103 if(NOT LIBCXX_CXX_ABI_INCLUDE_PATHS)104 message(FATAL_ERROR "LIBCXX_CXX_ABI_INCLUDE_PATHS must be set when selecting libsupc++ as an ABI library")105 endif()106 107 add_library(libcxx-abi-headers INTERFACE)108 import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}"109 "cxxabi.h;bits/c++config.h;bits/os_defines.h;bits/cpu_defines.h;bits/cxxabi_tweaks.h;bits/cxxabi_forced.h")110 target_compile_definitions(libcxx-abi-headers INTERFACE "-D__GLIBCXX__")111 112 import_shared_library(libcxx-abi-shared supc++)113 target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)114 115 import_static_library(libcxx-abi-static "${LIBCXX_CXX_ABI_LIBRARY_PATH}" supc++)116 target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)117 118# Link against the in-tree libc++abi119elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxabi")120 add_library(libcxx-abi-headers INTERFACE)121 target_link_libraries(libcxx-abi-headers INTERFACE cxxabi-headers)122 target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBCXX_BUILDING_LIBCXXABI")123 124 if (TARGET cxxabi_shared)125 add_library(libcxx-abi-shared INTERFACE)126 target_link_libraries(libcxx-abi-shared INTERFACE cxxabi_shared)127 128 # When using the in-tree libc++abi as an ABI library, libc++ re-exports the129 # libc++abi symbols (on platforms where it can) because libc++abi is only an130 # implementation detail of libc++.131 target_link_libraries(libcxx-abi-shared INTERFACE cxxabi-reexports)132 133 # Populate the OUTPUT_NAME property of libcxx-abi-shared because that is used when134 # generating a linker script.135 get_target_property(_output_name cxxabi_shared OUTPUT_NAME)136 set_target_properties(libcxx-abi-shared PROPERTIES "OUTPUT_NAME" "${_output_name}")137 endif()138 139 if (TARGET cxxabi_static)140 add_library(libcxx-abi-static ALIAS cxxabi_static)141 endif()142 143 if (TARGET cxxabi_shared_objects)144 add_library(libcxx-abi-shared-objects ALIAS cxxabi_shared_objects)145 endif()146 147 if (TARGET cxxabi_static_objects)148 add_library(libcxx-abi-static-objects ALIAS cxxabi_static_objects)149 endif()150 151# Link against a system-provided libc++abi152elseif ("${LIBCXX_CXX_ABI}" STREQUAL "system-libcxxabi")153 if(NOT LIBCXX_CXX_ABI_INCLUDE_PATHS)154 message(FATAL_ERROR "LIBCXX_CXX_ABI_INCLUDE_PATHS must be set when selecting system-libcxxabi as an ABI library")155 endif()156 157 add_library(libcxx-abi-headers INTERFACE)158 import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}" "cxxabi.h;__cxxabi_config.h")159 target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBCXX_BUILDING_LIBCXXABI")160 161 import_shared_library(libcxx-abi-shared c++abi)162 target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)163 164 import_static_library(libcxx-abi-static "${LIBCXX_CXX_ABI_LIBRARY_PATH}" c++abi)165 target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)166 167# Link against a system-provided libcxxrt168elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxrt")169 if(NOT LIBCXX_CXX_ABI_INCLUDE_PATHS)170 message(STATUS "LIBCXX_CXX_ABI_INCLUDE_PATHS not set, using /usr/include/c++/v1")171 set(LIBCXX_CXX_ABI_INCLUDE_PATHS "/usr/include/c++/v1")172 endif()173 add_library(libcxx-abi-headers INTERFACE)174 import_private_headers(libcxx-abi-headers "${LIBCXX_CXX_ABI_INCLUDE_PATHS}"175 "cxxabi.h;unwind.h;unwind-arm.h;unwind-itanium.h")176 target_compile_definitions(libcxx-abi-headers INTERFACE "-DLIBCXXRT")177 178 import_shared_library(libcxx-abi-shared cxxrt)179 target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)180 181 import_static_library(libcxx-abi-static "${LIBCXX_CXX_ABI_LIBRARY_PATH}" cxxrt)182 target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)183 184# Link against a system-provided vcruntime185# FIXME: Figure out how to configure the ABI library on Windows.186elseif ("${LIBCXX_CXX_ABI}" STREQUAL "vcruntime")187 add_library(libcxx-abi-headers INTERFACE)188 add_library(libcxx-abi-shared INTERFACE)189 add_library(libcxx-abi-static INTERFACE)190 191# Don't link against any ABI library192elseif ("${LIBCXX_CXX_ABI}" STREQUAL "none")193 add_library(libcxx-abi-headers INTERFACE)194 target_compile_definitions(libcxx-abi-headers INTERFACE "-D_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY")195 196 add_library(libcxx-abi-shared INTERFACE)197 target_link_libraries(libcxx-abi-shared INTERFACE libcxx-abi-headers)198 199 add_library(libcxx-abi-static INTERFACE)200 target_link_libraries(libcxx-abi-static INTERFACE libcxx-abi-headers)201endif()202