
#=============================================================================
# Copyright 2008-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
#  License text for the above reference.)

# Function to compile a source file to identify the compiler ABI.
# This is used internally by CMake and should not be included by user
# code.

include(${CMAKE_ROOT}/Modules/CMakeParseImplicitLinkInfo.cmake)

function(CMAKE_DETERMINE_COMPILER_ABI lang src)
  if(NOT DEFINED CMAKE_${lang}_ABI_COMPILED)
    message(STATUS "Detecting ${lang} compiler ABI info")

    # Compile the ABI identification source.
    set(BIN "${CMAKE_PLATFORM_INFO_DIR}/CMakeDetermineCompilerABI_${lang}.bin")
    set(CMAKE_FLAGS )
    if(DEFINED CMAKE_${lang}_VERBOSE_FLAG)
      set(CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS=${CMAKE_${lang}_VERBOSE_FLAG}")
    endif()
    if(NOT "x${CMAKE_${lang}_COMPILER_ID}" STREQUAL "xMSVC")
      # Avoid adding our own platform standard libraries for compilers
      # from which we might detect implicit link libraries.
      list(APPEND CMAKE_FLAGS "-DCMAKE_${lang}_STANDARD_LIBRARIES=")
    endif()
    try_compile(CMAKE_${lang}_ABI_COMPILED
      ${CMAKE_BINARY_DIR} ${src}
      CMAKE_FLAGS ${CMAKE_FLAGS}
                  # Ignore unused flags when we are just determining the ABI.
                  "--no-warn-unused-cli"
      OUTPUT_VARIABLE OUTPUT
      COPY_FILE "${BIN}"
      COPY_FILE_ERROR _copy_error
      )
    # Move result from cache to normal variable.
    set(CMAKE_${lang}_ABI_COMPILED ${CMAKE_${lang}_ABI_COMPILED})
    unset(CMAKE_${lang}_ABI_COMPILED CACHE)
    set(CMAKE_${lang}_ABI_COMPILED ${CMAKE_${lang}_ABI_COMPILED} PARENT_SCOPE)

    # Load the resulting information strings.
    if(CMAKE_${lang}_ABI_COMPILED AND NOT _copy_error)
      message(STATUS "Detecting ${lang} compiler ABI info - done")
      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
        "Detecting ${lang} compiler ABI info compiled with the following output:\n${OUTPUT}\n\n")
      file(STRINGS "${BIN}" ABI_STRINGS LIMIT_COUNT 2 REGEX "INFO:[A-Za-z0-9_]+\\[[^]]*\\]")
      foreach(info ${ABI_STRINGS})
        if("${info}" MATCHES "INFO:sizeof_dptr\\[0*([^]]*)\\]")
          set(ABI_SIZEOF_DPTR "${CMAKE_MATCH_1}")
        endif()
        if("${info}" MATCHES "INFO:abi\\[([^]]*)\\]")
          set(ABI_NAME "${CMAKE_MATCH_1}")
        endif()
      endforeach()

      if(ABI_SIZEOF_DPTR)
        set(CMAKE_${lang}_SIZEOF_DATA_PTR "${ABI_SIZEOF_DPTR}" PARENT_SCOPE)
      elseif(CMAKE_${lang}_SIZEOF_DATA_PTR_DEFAULT)
        set(CMAKE_${lang}_SIZEOF_DATA_PTR "${CMAKE_${lang}_SIZEOF_DATA_PTR_DEFAULT}" PARENT_SCOPE)
      endif()

      if(ABI_NAME)
        set(CMAKE_${lang}_COMPILER_ABI "${ABI_NAME}" PARENT_SCOPE)
      endif()

      # Parse implicit linker information for this language, if available.
      set(implicit_dirs "")
      set(implicit_libs "")
      set(implicit_fwks "")
      if(CMAKE_${lang}_VERBOSE_FLAG)
        CMAKE_PARSE_IMPLICIT_LINK_INFO("${OUTPUT}" implicit_libs implicit_dirs implicit_fwks log
          "${CMAKE_${lang}_IMPLICIT_OBJECT_REGEX}")
        file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
          "Parsed ${lang} implicit link information from above output:\n${log}\n\n")
      endif()
      # for VS IDE Intel Fortran we have to figure out the
      # implicit link path for the fortran run time using
      # a try-compile
      if("${lang}" MATCHES "Fortran"
          AND "${CMAKE_GENERATOR}" MATCHES "Visual Studio")
        set(_desc "Determine Intel Fortran Compiler Implicit Link Path")
        message(STATUS "${_desc}")
        # Build a sample project which reports symbols.
        try_compile(IFORT_LIB_PATH_COMPILED
          ${CMAKE_BINARY_DIR}/CMakeFiles/IntelVSImplicitPath
          ${CMAKE_ROOT}/Modules/IntelVSImplicitPath
          IntelFortranImplicit
          CMAKE_FLAGS
          "-DCMAKE_Fortran_FLAGS:STRING=${CMAKE_Fortran_FLAGS}"
          OUTPUT_VARIABLE _output)
        file(WRITE
          "${CMAKE_BINARY_DIR}/CMakeFiles/IntelVSImplicitPath/output.txt"
          "${_output}")
        include(${CMAKE_BINARY_DIR}/CMakeFiles/IntelVSImplicitPath/output.cmake OPTIONAL)
        set(_desc "Determine Intel Fortran Compiler Implicit Link Path -- done")
        message(STATUS "${_desc}")
      endif()

      # Implicit link libraries cannot be used explicitly for multiple
      # OS X architectures, so we skip it.
      if(DEFINED CMAKE_OSX_ARCHITECTURES)
        if("${CMAKE_OSX_ARCHITECTURES}" MATCHES ";")
          set(implicit_libs "")
        endif()
      endif()

      set(CMAKE_${lang}_IMPLICIT_LINK_LIBRARIES "${implicit_libs}" PARENT_SCOPE)
      set(CMAKE_${lang}_IMPLICIT_LINK_DIRECTORIES "${implicit_dirs}" PARENT_SCOPE)
      set(CMAKE_${lang}_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES "${implicit_fwks}" PARENT_SCOPE)

      # Detect library architecture directory name.
      if(CMAKE_LIBRARY_ARCHITECTURE_REGEX)
        foreach(dir ${implicit_dirs})
          if("${dir}" MATCHES "/lib/${CMAKE_LIBRARY_ARCHITECTURE_REGEX}$")
            get_filename_component(arch "${dir}" NAME)
            set(CMAKE_${lang}_LIBRARY_ARCHITECTURE "${arch}" PARENT_SCOPE)
            break()
          endif()
        endforeach()
      endif()

    else()
      message(STATUS "Detecting ${lang} compiler ABI info - failed")
      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
        "Detecting ${lang} compiler ABI info failed to compile with the following output:\n${OUTPUT}\n${_copy_error}\n\n")
    endif()
  endif()
endfunction()
