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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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include_guard(GLOBAL)
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include(Internal/CheckFlagCommonConfig)
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include(Internal/CheckSourceCompiles)
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include(CMakeCheckCompilerFlagCommonPatterns)
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cmake_policy(PUSH)
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cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
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function(CMAKE_CHECK_LINKER_FLAG _lang _flag _var)
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# link step supports less languages than the compiler
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# so do a first check about the requested language
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if (_lang STREQUAL "ISPC")
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message (SEND_ERROR "check_linker_flag: ${_lang}: unsupported language.")
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return()
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endif()
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# Parse extra arguments
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cmake_parse_arguments(PARSE_ARGV 3 CHECK_LINKER_FLAG "" "OUTPUT_VARIABLE" "")
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cmake_check_flag_common_init("check_linker_flag" ${_lang} _lang_src _lang_fail_regex)
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set(CMAKE_REQUIRED_LINK_OPTIONS "${_flag}")
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check_compiler_flag_common_patterns(_common_patterns)
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# Match linker warnings if the exact flag is ignored.
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foreach(flag IN LISTS _flag)
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string(REGEX REPLACE "([][+.*?()^$])" [[\\\1]] _flag_regex "${flag}")
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list(APPEND _common_patterns
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FAIL_REGEX "warning: .*${_flag_regex}.* ignored"
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)
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endforeach()
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cmake_check_source_compiles(${_lang}
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"${_lang_src}"
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${_var}
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${_lang_fail_regex}
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${_common_patterns}
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OUTPUT_VARIABLE _output
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)
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if (CHECK_LINKER_FLAG_OUTPUT_VARIABLE)
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set(${CHECK_LINKER_FLAG_OUTPUT_VARIABLE} "${_output}" PARENT_SCOPE)
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endif()
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cmake_check_flag_common_finish()
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endfunction()
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cmake_policy(POP)
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