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#=============================================================================
# Copyright 2004-2012 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.)
macro(_cmake_find_compiler lang)
# Use already-enabled languages for reference.
get_property(_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
list(REMOVE_ITEM _languages "${lang}")
if(CMAKE_${lang}_COMPILER_INIT)
# Search only for the specified compiler.
set(CMAKE_${lang}_COMPILER_LIST "${CMAKE_${lang}_COMPILER_INIT}")
else()
# Re-order the compiler list with preferred vendors first.
set(_${lang}_COMPILER_LIST "${CMAKE_${lang}_COMPILER_LIST}")
set(CMAKE_${lang}_COMPILER_LIST "")
# Prefer vendors of compilers from reference languages.
foreach(l ${_languages})
list(APPEND CMAKE_${lang}_COMPILER_LIST
${_${lang}_COMPILER_NAMES_${CMAKE_${l}_COMPILER_ID}})
endforeach()
# Prefer vendors based on the platform.
list(APPEND CMAKE_${lang}_COMPILER_LIST ${CMAKE_${lang}_COMPILER_NAMES})
# Append the rest of the list and remove duplicates.
list(APPEND CMAKE_${lang}_COMPILER_LIST ${_${lang}_COMPILER_LIST})
unset(_${lang}_COMPILER_LIST)
list(REMOVE_DUPLICATES CMAKE_${lang}_COMPILER_LIST)
if(CMAKE_${lang}_COMPILER_EXCLUDE)
list(REMOVE_ITEM CMAKE_${lang}_COMPILER_LIST
${CMAKE_${lang}_COMPILER_EXCLUDE})
endif()
endif()
# Look for directories containing compilers of reference languages.
set(_${lang}_COMPILER_HINTS)
foreach(l ${_languages})
if(CMAKE_${l}_COMPILER AND IS_ABSOLUTE "${CMAKE_${l}_COMPILER}")
get_filename_component(_hint "${CMAKE_${l}_COMPILER}" PATH)
if(IS_DIRECTORY "${_hint}")
list(APPEND _${lang}_COMPILER_HINTS "${_hint}")
endif()
unset(_hint)
endif()
endforeach()
# Find the compiler.
if(_${lang}_COMPILER_HINTS)
# Prefer directories containing compilers of reference languages.
list(REMOVE_DUPLICATES _${lang}_COMPILER_HINTS)
find_program(CMAKE_${lang}_COMPILER
NAMES ${CMAKE_${lang}_COMPILER_LIST}
PATHS ${_${lang}_COMPILER_HINTS}
NO_DEFAULT_PATH
DOC "${lang} compiler")
endif()
find_program(CMAKE_${lang}_COMPILER NAMES ${CMAKE_${lang}_COMPILER_LIST} DOC "${lang} compiler")
if(CMAKE_${lang}_COMPILER_INIT AND NOT CMAKE_${lang}_COMPILER)
set(CMAKE_${lang}_COMPILER "${CMAKE_${lang}_COMPILER_INIT}" CACHE FILEPATH "${lang} compiler" FORCE)
endif()
unset(_${lang}_COMPILER_HINTS)
unset(_languages)
# Look for a make tool provided by Xcode
if(CMAKE_${lang}_COMPILER STREQUAL "CMAKE_${lang}_COMPILER-NOTFOUND" AND CMAKE_HOST_APPLE)
foreach(comp ${CMAKE_${lang}_COMPILER_LIST})
execute_process(COMMAND xcrun --find ${comp}
OUTPUT_VARIABLE _xcrun_out OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE _xcrun_err)
if(_xcrun_out)
set_property(CACHE CMAKE_${lang}_COMPILER PROPERTY VALUE "${_xcrun_out}")
break()
endif()
endforeach()
endif()
endmacro()
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