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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 also be
     14 #               installed alongside the libc++ headers.
     15 #   abidirs   : A list of relative paths to create under an include directory
     16 #               in the libc++ build directory.
     17 #
     18 macro(setup_abi_lib abidefines abilib abifiles abidirs)
     19   list(APPEND LIBCXX_COMPILE_FLAGS ${abidefines})
     20   set(LIBCXX_CXX_ABI_INCLUDE_PATHS "${LIBCXX_CXX_ABI_INCLUDE_PATHS}"
     21     CACHE PATH
     22     "Paths to C++ ABI header directories separated by ';'." FORCE
     23     )
     24 
     25   set(LIBCXX_CXX_ABI_LIBRARY ${abilib})
     26 
     27   set(LIBCXX_ABILIB_FILES ${abifiles})
     28 
     29   file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/include")
     30   foreach(_d ${abidirs})
     31     file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/include/${_d}")
     32   endforeach()
     33 
     34   foreach(fpath ${LIBCXX_ABILIB_FILES})
     35     set(found FALSE)
     36     foreach(incpath ${LIBCXX_CXX_ABI_INCLUDE_PATHS})
     37       if (EXISTS "${incpath}/${fpath}")
     38         set(found TRUE)
     39         get_filename_component(dstdir ${fpath} PATH)
     40         get_filename_component(ifile ${fpath} NAME)
     41         file(COPY "${incpath}/${fpath}"
     42           DESTINATION "${CMAKE_BINARY_DIR}/include/${dstdir}"
     43           )
     44         if (LIBCXX_INSTALL_HEADERS)
     45           install(FILES "${CMAKE_BINARY_DIR}/include/${fpath}"
     46             DESTINATION include/c++/v1/${dstdir}
     47             COMPONENT libcxx
     48             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     49             )
     50         endif()
     51         list(APPEND abilib_headers "${CMAKE_BINARY_DIR}/include/${fpath}")
     52       endif()
     53     endforeach()
     54     if (NOT found)
     55       message(WARNING "Failed to find ${fpath}")
     56     endif()
     57   endforeach()
     58 
     59   add_custom_target(LIBCXX_CXX_ABI_DEPS DEPENDS ${abilib_headers})
     60   include_directories("${CMAKE_BINARY_DIR}/include")
     61 
     62 endmacro()
     63 
     64 
     65 # Configure based on the selected ABI library.
     66 if ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libstdc++" OR
     67     "${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libsupc++")
     68   set(_LIBSUPCXX_INCLUDE_FILES
     69     cxxabi.h bits/c++config.h bits/os_defines.h bits/cpu_defines.h
     70     bits/cxxabi_tweaks.h bits/cxxabi_forced.h
     71     )
     72   if ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libstdc++")
     73     set(_LIBSUPCXX_DEFINES "-DLIBSTDCXX")
     74     set(_LIBSUPCXX_LIBNAME stdc++)
     75   else()
     76     set(_LIBSUPCXX_DEFINES "")
     77     set(_LIBSUPCXX_LIBNAME supc++)
     78   endif()
     79   setup_abi_lib(
     80     "-D__GLIBCXX__ ${_LIBSUPCXX_DEFINES}"
     81     "${_LIBSUPCXX_LIBNAME}" "${_LIBSUPCXX_INCLUDE_FILES}" "bits"
     82     )
     83 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxabi")
     84   if (LIBCXX_CXX_ABI_INTREE)
     85     # Link against just-built "cxxabi" target.
     86     if (LIBCXX_ENABLE_STATIC_ABI_LIBRARY)
     87         set(CXXABI_LIBNAME cxxabi_static)
     88     else()
     89         set(CXXABI_LIBNAME cxxabi_shared)
     90     endif()
     91     set(LIBCXX_LIBCPPABI_VERSION "2" PARENT_SCOPE)
     92   else()
     93     # Assume c++abi is installed in the system, rely on -lc++abi link flag.
     94     set(CXXABI_LIBNAME "c++abi")
     95   endif()
     96   setup_abi_lib("-DLIBCXX_BUILDING_LIBCXXABI"
     97     ${CXXABI_LIBNAME} "cxxabi.h;__cxxabi_config.h" ""
     98     )
     99 elseif ("${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "libcxxrt")
    100   setup_abi_lib("-DLIBCXXRT"
    101     "cxxrt" "cxxabi.h;unwind.h;unwind-arm.h;unwind-itanium.h" ""
    102     )
    103 elseif (NOT "${LIBCXX_CXX_ABI_LIBNAME}" STREQUAL "none")
    104   message(FATAL_ERROR
    105     "Currently libstdc++, libsupc++, libcxxabi, libcxxrt and none are "
    106     "supported for c++ abi."
    107     )
    108 endif ()
    109