# Distributed under the OSI-approved BSD 3-Clause License. See accompanying | |
# file Copyright.txt or https://cmake.org/licensing for details. | |
#.rst: | |
# CheckFortranCompilerFlag | |
# ------------------------ | |
# | |
# Check whether the Fortran compiler supports a given flag. | |
# | |
# CHECK_Fortran_COMPILER_FLAG(<flag> <var>) | |
# | |
# :: | |
# | |
# <flag> - the compiler flag | |
# <var> - variable to store the result | |
# Will be created as an internal cache variable. | |
# | |
# This internally calls the check_fortran_source_compiles macro and | |
# sets CMAKE_REQUIRED_DEFINITIONS to <flag>. See help for | |
# CheckFortranSourceCompiles for a listing of variables that can | |
# otherwise modify the build. The result only tells that the compiler | |
# does not give an error message when it encounters the flag. If the | |
# flag has any effect or even a specific one is beyond the scope of | |
# this module. | |
include(CheckFortranSourceCompiles) | |
include(CMakeCheckCompilerFlagCommonPatterns) | |
macro (CHECK_Fortran_COMPILER_FLAG _FLAG _RESULT) | |
set(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}") | |
set(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}") | |
# Normalize locale during test compilation. | |
set(_CheckFortranCompilerFlag_LOCALE_VARS LC_ALL LC_MESSAGES LANG) | |
foreach(v ${_CheckFortranCompilerFlag_LOCALE_VARS}) | |
set(_CheckFortranCompilerFlag_SAVED_${v} "$ENV{${v}}") | |
set(ENV{${v}} C) | |
endforeach() | |
CHECK_COMPILER_FLAG_COMMON_PATTERNS(_CheckFortranCompilerFlag_COMMON_PATTERNS) | |
CHECK_Fortran_SOURCE_COMPILES(" program test\n stop\n end program" ${_RESULT} | |
# Some compilers do not fail with a bad flag | |
FAIL_REGEX "command line option .* is valid for .* but not for Fortran" # GNU | |
${_CheckFortranCompilerFlag_COMMON_PATTERNS} | |
) | |
foreach(v ${_CheckFortranCompilerFlag_LOCALE_VARS}) | |
set(ENV{${v}} ${_CheckFortranCompilerFlag_SAVED_${v}}) | |
unset(_CheckFortranCompilerFlag_SAVED_${v}) | |
endforeach() | |
unset(_CheckFortranCompilerFlag_LOCALE_VARS) | |
unset(_CheckFortranCompilerFlag_COMMON_PATTERNS) | |
set (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}") | |
endmacro () |