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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.
include_guard(GLOBAL)
include(Internal/CheckFlagCommonConfig)
include(Internal/CheckSourceCompiles)
include(CMakeCheckCompilerFlagCommonPatterns)
block(SCOPE_FOR POLICIES)
cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
function(CMAKE_CHECK_LINKER_FLAG _lang _flag _var)
# link step supports less languages than the compiler
# so do a first check about the requested language
if (_lang STREQUAL "ISPC")
message (SEND_ERROR "check_linker_flag: ${_lang}: unsupported language.")
return()
endif()
# Parse extra arguments
cmake_parse_arguments(PARSE_ARGV 3 CHECK_LINKER_FLAG "" "OUTPUT_VARIABLE" "")
cmake_check_flag_common_init("check_linker_flag" ${_lang} _lang_src _lang_fail_regex)
set(CMAKE_REQUIRED_LINK_OPTIONS "${_flag}")
check_compiler_flag_common_patterns(_common_patterns)
# Match linker warnings if the exact flag is ignored.
foreach(flag IN LISTS _flag)
string(REGEX REPLACE "([][+.*?()^$])" [[\\\1]] _flag_regex "${flag}")
list(APPEND _common_patterns
FAIL_REGEX "warning: .*${_flag_regex}.* ignored"
)
endforeach()
cmake_check_source_compiles(${_lang}
"${_lang_src}"
${_var}
${_lang_fail_regex}
${_common_patterns}
OUTPUT_VARIABLE _output
)
if (CHECK_LINKER_FLAG_OUTPUT_VARIABLE)
set(${CHECK_LINKER_FLAG_OUTPUT_VARIABLE} "${_output}" PARENT_SCOPE)
endif()
cmake_check_flag_common_finish()
endfunction()
endblock()
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