| # 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() | |