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d66858c8e4
The warning emmitted by GCC for invalid options have been updated to read "command-line option XXX is valid ..." instead of "command line option XXX is valid ...". Update the regex to make it valid with both the old and new warning message. Fixes: #21275
106 lines
3.8 KiB
CMake
106 lines
3.8 KiB
CMake
# 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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#[=======================================================================[.rst:
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CheckCompilerFlag
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---------------------
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.. versionadded:: 3.19
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Check whether the compiler supports a given flag.
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.. command:: check_compiler_flag
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.. code-block:: cmake
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check_compiler_flag(<lang> <flag> <var>)
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Check that the ``<flag>`` is accepted by the compiler without a diagnostic.
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Stores the result in an internal cache entry named ``<var>``.
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This command temporarily sets the ``CMAKE_REQUIRED_DEFINITIONS`` variable
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and calls the ``check_source_compiles(<LANG>`` function from the
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:module:`CheckSourceCompiles` module. See documentation of that
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module for a listing of variables that can otherwise modify the build.
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A positive result from this check indicates only that the compiler did not
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issue a diagnostic message when given the flag. Whether the flag has any
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effect or even a specific one is beyond the scope of this module.
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.. note::
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Since the :command:`try_compile` command forwards flags from variables
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like :variable:`CMAKE_<LANG>_FLAGS <CMAKE_<LANG>_FLAGS>`, unknown flags
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in such variables may cause a false negative for this check.
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#]=======================================================================]
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include_guard(GLOBAL)
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include(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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cmake_policy(SET CMP0057 NEW) # if() supports IN_LIST
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function(CHECK_COMPILER_FLAG _lang _flag _var)
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if(_lang STREQUAL C)
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set(_lang_src "int main(void) { return 0; }")
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set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for C")
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elseif(_lang STREQUAL CXX)
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set(_lang_src "int main() { return 0; }")
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set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for C\\+\\+")
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elseif(_lang STREQUAL Fortran)
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set(_lang_src " program test\n stop\n end program")
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set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for Fortran")
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elseif(_lang STREQUAL OBJC)
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set(_lang_src [=[
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#ifndef __OBJC__
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# error "Not an Objective-C compiler"
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#endif
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int main(void) { return 0; }]=])
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set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for Objective-C" # GNU
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FAIL_REGEX "argument unused during compilation: .*") # Clang
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elseif(_lang STREQUAL OBJCXX)
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set(_lang_src [=[
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#ifndef __OBJC__
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# error "Not an Objective-C++ compiler"
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#endif
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int main(void) { return 0; }]=])
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set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for Objective-C\\+\\+" # GNU
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FAIL_REGEX "argument unused during compilation: .*") # Clang
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else()
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message (SEND_ERROR "check_compiler_flag: ${_lang}: unknown language.")
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return()
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endif()
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get_property (_supported_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
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if (NOT _lang IN_LIST _supported_languages)
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message (SEND_ERROR "check_compiler_flag: ${_lang}: needs to be enabled before use.")
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return()
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endif()
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set(CMAKE_REQUIRED_DEFINITIONS ${_flag})
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# Normalize locale during test compilation.
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set(_locale_vars LC_ALL LC_MESSAGES LANG)
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foreach(v IN LISTS _locale_vars)
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set(_locale_vars_saved_${v} "$ENV{${v}}")
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set(ENV{${v}} C)
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endforeach()
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check_compiler_flag_common_patterns(_common_patterns)
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check_source_compiles(${_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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)
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foreach(v IN LISTS _locale_vars)
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set(ENV{${v}} ${_locale_vars_saved_${v}})
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endforeach()
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set(${_var} "${${_var}}" PARENT_SCOPE)
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endfunction ()
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cmake_policy(POP)
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