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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
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(_${lang}_COMPILER_HINTS "${CMAKE_${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 "${lang} compiler")
endif()
if(CMAKE_HOST_WIN32 AND CMAKE_GENERATOR MATCHES "Ninja")
# On Windows command-line builds, the Makefile generators each imply
# a preferred compiler tool. The Ninja generator does not imply a
# compiler tool, so use the compiler that occurs first in PATH.
find_program(CMAKE_${lang}_COMPILER
NAMES ${CMAKE_${lang}_COMPILER_LIST}
NAMES_PER_DIR
DOC "${lang} compiler"
NO_PACKAGE_ROOT_PATH
NO_CMAKE_PATH
NO_CMAKE_ENVIRONMENT_PATH
NO_CMAKE_SYSTEM_PATH
)
endif()
find_program(CMAKE_${lang}_COMPILER NAMES ${CMAKE_${lang}_COMPILER_LIST} DOC "${lang} compiler")
if(_CMAKE_${lang}_COMPILER_PATHS)
# As a last fall-back, search in language-specific paths
find_program(CMAKE_${lang}_COMPILER
NAMES ${CMAKE_${lang}_COMPILER_LIST}
NAMES_PER_DIR
PATHS ${_CMAKE_${lang}_COMPILER_PATHS}
DOC "${lang} compiler"
NO_DEFAULT_PATH
)
endif()
if(CMAKE_${lang}_COMPILER_INIT AND NOT CMAKE_${lang}_COMPILER)
set_property(CACHE CMAKE_${lang}_COMPILER PROPERTY VALUE "${CMAKE_${lang}_COMPILER_INIT}")
endif()
unset(_${lang}_COMPILER_HINTS)
unset(_languages)
# Look for a make tool provided by Xcode
if(CMAKE_HOST_APPLE)
macro(_query_xcrun compiler_name result_var_keyword result_var)
if(NOT "x${result_var_keyword}" STREQUAL "xRESULT_VAR")
message(FATAL_ERROR "Bad arguments to macro")
endif()
execute_process(COMMAND xcrun --find ${compiler_name}
OUTPUT_VARIABLE _xcrun_out OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE _xcrun_err)
set("${result_var}" "${_xcrun_out}")
endmacro()
set(xcrun_result)
if (CMAKE_${lang}_COMPILER MATCHES "^/usr/bin/(.+)$")
_query_xcrun("${CMAKE_MATCH_1}" RESULT_VAR xcrun_result)
elseif (CMAKE_${lang}_COMPILER STREQUAL "CMAKE_${lang}_COMPILER-NOTFOUND")
foreach(comp ${CMAKE_${lang}_COMPILER_LIST})
_query_xcrun("${comp}" RESULT_VAR xcrun_result)
if(xcrun_result)
break()
endif()
endforeach()
endif()
if (xcrun_result)
set_property(CACHE CMAKE_${lang}_COMPILER PROPERTY VALUE "${xcrun_result}")
endif()
endif()
endmacro()
macro(_cmake_find_compiler_path lang)
if(CMAKE_${lang}_COMPILER)
# we only get here if CMAKE_${lang}_COMPILER was specified using -D or a pre-made CMakeCache.txt
# (e.g. via ctest) or set in CMAKE_TOOLCHAIN_FILE
# if CMAKE_${lang}_COMPILER is a list, use the first item as
# CMAKE_${lang}_COMPILER and the rest as CMAKE_${lang}_COMPILER_ARG1
set(CMAKE_${lang}_COMPILER_ARG1 "${CMAKE_${lang}_COMPILER}")
list(POP_FRONT CMAKE_${lang}_COMPILER_ARG1 CMAKE_${lang}_COMPILER)
list(JOIN CMAKE_${lang}_COMPILER_ARG1 " " CMAKE_${lang}_COMPILER_ARG1)
# find the compiler in the PATH if necessary
# if compiler (and arguments) comes from cache then synchronize cache with updated CMAKE_<LANG>_COMPILER
get_filename_component(_CMAKE_USER_${lang}_COMPILER_PATH "${CMAKE_${lang}_COMPILER}" PATH)
if(NOT _CMAKE_USER_${lang}_COMPILER_PATH)
find_program(CMAKE_${lang}_COMPILER_WITH_PATH NAMES ${CMAKE_${lang}_COMPILER})
if(CMAKE_${lang}_COMPILER_WITH_PATH)
set(CMAKE_${lang}_COMPILER ${CMAKE_${lang}_COMPILER_WITH_PATH})
get_property(_CMAKE_${lang}_COMPILER_CACHED CACHE CMAKE_${lang}_COMPILER PROPERTY TYPE)
if(_CMAKE_${lang}_COMPILER_CACHED)
set(CMAKE_${lang}_COMPILER "${CMAKE_${lang}_COMPILER}" CACHE STRING "${lang} compiler" FORCE)
endif()
unset(_CMAKE_${lang}_COMPILER_CACHED)
endif()
unset(CMAKE_${lang}_COMPILER_WITH_PATH CACHE)
elseif (EXISTS ${CMAKE_${lang}_COMPILER})
get_property(_CMAKE_${lang}_COMPILER_CACHED CACHE CMAKE_${lang}_COMPILER PROPERTY TYPE)
if(_CMAKE_${lang}_COMPILER_CACHED)
set(CMAKE_${lang}_COMPILER "${CMAKE_${lang}_COMPILER}" CACHE STRING "${lang} compiler" FORCE)
endif()
unset(_CMAKE_${lang}_COMPILER_CACHED)
endif()
endif()
endmacro()
function(_cmake_find_compiler_sysroot lang)
if(CMAKE_${lang}_COMPILER_ID STREQUAL "GNU")
execute_process(COMMAND "${CMAKE_${lang}_COMPILER}" -print-sysroot
OUTPUT_STRIP_TRAILING_WHITESPACE
OUTPUT_VARIABLE _cmake_sysroot_run_out
ERROR_VARIABLE _cmake_sysroot_run_err)
if(_cmake_sysroot_run_out AND NOT _cmake_sysroot_run_err
AND NOT _cmake_sysroot_run_out STREQUAL "/"
AND IS_DIRECTORY "${_cmake_sysroot_run_out}/usr")
file(TO_CMAKE_PATH "${_cmake_sysroot_run_out}/usr" _cmake_sysroot_run_out_usr)
set(CMAKE_${lang}_COMPILER_SYSROOT "${_cmake_sysroot_run_out_usr}" PARENT_SCOPE)
else()
set(CMAKE_${lang}_COMPILER_SYSROOT "" PARENT_SCOPE)
endif()
endif()
endfunction()
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