/usr/share/cmake-3.5/Modules/CheckFortranCompilerFlag.cmake is in cmake-data 3.5.1-1ubuntu1.
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# 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.
#=============================================================================
# Copyright 2015 Nicolas Bock <nicolasbock@gmail.com>
# Copyright 2006-2011 Kitware, Inc.
# Copyright 2006 Alexander Neundorf <neundorf@kde.org>
# Copyright 2011 Matthias Kretz <kretz@kde.org>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
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 ()
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