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      1 
      2 #===============================================================================
      3 # Add an ABI library if appropriate
      4 #===============================================================================
      5 
      6 #
      7 # _setup_abi: Set up the build to use an ABI library
      8 #
      9 # Parameters:
     10 #   abidefines: A list of defines needed to compile libc++ with the ABI library
     11 #   abilib    : The ABI library to link against.
     12 #   abifiles  : A list of files (which may be relative paths) to copy into the
     13 #               libc++ build tree for the build.  These files will be copied
     14 #               twice: once into include/, so the libc++ build itself can find
     15 #               them, and once into include/c++/v1, so that a clang built into
     16 #               the same build area will find them.  These files will also be
     17 #               installed alongside the libc++ headers.
     18 #   abidirs   : A list of relative paths to create under an include directory
     19 #               in the libc++ build directory.
     20 #
     21 
     22 macro(setup_abi_lib abidefines abilib abifiles abidirs)
     23   list(APPEND LIBCXX_COMPILE_FLAGS ${abidefines})
     24   set(LIBCXX_CXX_ABI_INCLUDE_PATHS "${LIBCXX_CXX_ABI_INCLUDE_PATHS}"
     25     CACHE PATH
     26     "Paths to C++ ABI header directories separated by ';'." FORCE
     27     )
     28   set(LIBCXX_CXX_ABI_LIBRARY_PATH "${LIBCXX_CXX_ABI_LIBRARY_PATH}"
     29     CACHE PATH
     30     "Paths to C++ ABI library directory"
     31     )
     32   set(LIBCXX_CXX_ABI_LIBRARY ${abilib})
     33   set(LIBCXX_ABILIB_FILES ${abifiles})
     34 
     35   # The place in the build tree where we store out-of-source headers.
     36   file(MAKE_DIRECTORY "${LIBCXX_BUILD_HEADERS_ROOT}")
     37   file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/include/c++/v1")
     38   foreach(_d ${abidirs})
     39     file(MAKE_DIRECTORY "${LIBCXX_BINARY_INCLUDE_DIR}/${_d}")
     40     file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/include/c++/v1/${_d}")
     41   endforeach()
     42 
     43   foreach(fpath ${LIBCXX_ABILIB_FILES})
     44     set(found FALSE)
     45     foreach(incpath ${LIBCXX_CXX_ABI_INCLUDE_PATHS})
     46       if (EXISTS "${incpath}/${fpath}")
     47         set(found TRUE)
     48         get_filename_component(dstdir ${fpath} PATH)
     49         get_filename_component(ifile ${fpath} NAME)
     50         file(COPY "${incpath}/${fpath}"
     51           DESTINATION "${LIBCXX_BINARY_INCLUDE_DIR}/${dstdir}"
     52           )
     53         file(COPY "${incpath}/${fpath}"
     54           DESTINATION "${CMAKE_BINARY_DIR}/include/c++/v1/${dstdir}"
     55           )
     56         if (LIBCXX_INSTALL_HEADERS)
     57           install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
     58             DESTINATION include/c++/v1/${dstdir}
     59             COMPONENT libcxx
     60             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     61             )
     62         endif()
     63         list(APPEND abilib_headers "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}")
     64       endif()
     65     endforeach()
     66     if (NOT found)
     67       message(WARNING "Failed to find ${fpath}")
     68     endif()
     69   endforeach()
     70 
     71   include_directories("${LIBCXX_BINARY_INCLUDE_DIR}")
     72 endmacro()
     73 
     74 
     75 # Configure based on the selected ABI library.
     76 if ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libstdc++" OR
     77     "${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libsupc++")
     78   set(_LIBSUPCXX_INCLUDE_FILES
     79     cxxabi.h bits/c++config.h bits/os_defines.h bits/cpu_defines.h
     80     bits/cxxabi_tweaks.h bits/cxxabi_forced.h
     81     )
     82   if ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libstdc++")
     83     set(_LIBSUPCXX_DEFINES "-DLIBSTDCXX")
     84     set(_LIBSUPCXX_LIBNAME stdc++)
     85   else()
     86     set(_LIBSUPCXX_DEFINES "")
     87     set(_LIBSUPCXX_LIBNAME supc++)
     88   endif()
     89   setup_abi_lib(
     90     "-D__GLIBCXX__ ${_LIBSUPCXX_DEFINES}"
     91     "${_LIBSUPCXX_LIBNAME}" "${_LIBSUPCXX_INCLUDE_FILES}" "bits"
     92     )
     93 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxabi")
     94   if (LIBCXX_CXX_ABI_INTREE)
     95     # Link against just-built "cxxabi" target.
     96     if (LIBCXX_ENABLE_STATIC_ABI_LIBRARY)
     97         set(CXXABI_LIBNAME cxxabi_static)
     98     else()
     99         set(CXXABI_LIBNAME cxxabi_shared)
    100     endif()
    101     set(LIBCXX_LIBCPPABI_VERSION "2" PARENT_SCOPE)
    102   else()
    103     # Assume c++abi is installed in the system, rely on -lc++abi link flag.
    104     set(CXXABI_LIBNAME "c++abi")
    105   endif()
    106   set(HEADERS "cxxabi.h;__cxxabi_config.h")
    107   if (LIBCXX_CXX_ABI_SYSTEM)
    108     set(HEADERS "")
    109   endif()
    110   setup_abi_lib("-DLIBCXX_BUILDING_LIBCXXABI" ${CXXABI_LIBNAME} "${HEADERS}" "")
    111 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxrt")
    112   setup_abi_lib("-DLIBCXXRT"
    113     "cxxrt" "cxxabi.h;unwind.h;unwind-arm.h;unwind-itanium.h" ""
    114     )
    115 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "vcruntime")
    116  # Nothing TODO
    117 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "none")
    118   list(APPEND LIBCXX_COMPILE_FLAGS "-D_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY")
    119 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "default")
    120   # Nothing TODO
    121 else()
    122   message(FATAL_ERROR
    123     "Unsupported c++ abi: '${LIBCXX_CXX_ABI_LIBNAME}'. \
    124      Currently libstdc++, libsupc++, libcxxabi, libcxxrt, default and none are
    125      supported for c++ abi."
    126     )
    127 endif ()
    128