# 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. .. command:: check_fortran_compiler_flag :: check_fortran_compiler_flag( ) Check that the ```` is accepted by the compiler without a diagnostic. Stores the result in an internal cache entry named ````. This command temporarily sets the ``CMAKE_REQUIRED_DEFINITIONS`` variable and calls the ``check_fortran_source_compiles`` macro from the :module:`CheckFortranSourceCompiles` module. See documentation of that module for a listing of variables that can otherwise modify the build. A positive result from this check indicates only that the compiler did not issue a diagnostic message when given the flag. Whether the flag has any effect or even a specific one is beyond the scope of this module. .. note:: Since the :command:`try_compile` command forwards flags from variables like :variable:`CMAKE_Fortran_FLAGS _FLAGS>`, unknown flags in such variables may cause a false negative for this check. #]=======================================================================] 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 ()