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+# 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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+
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+#[=======================================================================[.rst:
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+CheckFortranSourceRuns
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+----------------------
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+
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+Check if given Fortran source compiles and links into an executable and can
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+subsequently be run.
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+
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+.. command:: check_fortran_source_runs
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+
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+ .. code-block:: cmake
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+
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+ check_fortran_source_runs(<code> <resultVar>
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+ [SRC_EXT <extension>])
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+
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+ Check that the source supplied in ``<code>`` can be compiled as a Fortran source
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+ file, linked as an executable and then run. The ``<code>`` must contain at
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+ least ``program; end program`` statements. If the ``<code>`` could be built and run
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+ successfully, the internal cache variable specified by ``<resultVar>`` will
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+ be set to 1, otherwise it will be set to an value that evaluates to boolean
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+ false (e.g. an empty string or an error message).
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+
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+ By default, the test source file will be given a ``.F90`` file extension. The
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+ ``SRC_EXT`` option can be used to override this with ``.<extension>`` instead.
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+
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+ The underlying check is performed by the :command:`try_run` command. The
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+ compile and link commands can be influenced by setting any of the following
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+ variables prior to calling ``check_fortran_source_runs()``:
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+
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+ ``CMAKE_REQUIRED_FLAGS``
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+ Additional flags to pass to the compiler. Note that the contents of
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+ :variable:`CMAKE_Fortran_FLAGS <CMAKE_<LANG>_FLAGS>` and its associated
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+ configuration-specific variable are automatically added to the compiler
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+ command before the contents of ``CMAKE_REQUIRED_FLAGS``.
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+
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+ ``CMAKE_REQUIRED_DEFINITIONS``
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+ A :ref:`;-list <CMake Language Lists>` of compiler definitions of the form
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+ ``-DFOO`` or ``-DFOO=bar``. A definition for the name specified by
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+ ``<resultVar>`` will also be added automatically.
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+
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+ ``CMAKE_REQUIRED_INCLUDES``
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+ A :ref:`;-list <CMake Language Lists>` of header search paths to pass to
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+ the compiler. These will be the only header search paths used by
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+ ``try_run()``, i.e. the contents of the :prop_dir:`INCLUDE_DIRECTORIES`
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+ directory property will be ignored.
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+
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+ ``CMAKE_REQUIRED_LINK_OPTIONS``
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+ A :ref:`;-list <CMake Language Lists>` of options to add to the link
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+ command (see :command:`try_run` for further details).
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+
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+ ``CMAKE_REQUIRED_LIBRARIES``
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+ A :ref:`;-list <CMake Language Lists>` of libraries to add to the link
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+ command. These can be the name of system libraries or they can be
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+ :ref:`Imported Targets <Imported Targets>` (see :command:`try_run` for
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+ further details).
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+
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+ ``CMAKE_REQUIRED_QUIET``
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+ If this variable evaluates to a boolean true value, all status messages
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+ associated with the check will be suppressed.
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+
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+ The check is only performed once, with the result cached in the variable
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+ named by ``<resultVar>``. Every subsequent CMake run will re-use this cached
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+ value rather than performing the check again, even if the ``<code>`` changes.
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+ In order to force the check to be re-evaluated, the variable named by
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+ ``<resultVar>`` must be manually removed from the cache.
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+
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+#]=======================================================================]
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+
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+include_guard(GLOBAL)
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+
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+macro(CHECK_Fortran_SOURCE_RUNS SOURCE VAR)
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+ if(NOT DEFINED "${VAR}")
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+ set(_SRC_EXT)
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+ set(_key)
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+ foreach(arg ${ARGN})
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+ if("${arg}" MATCHES "^(SRC_EXT)$")
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+ set(_key "${arg}")
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+ elseif(_key)
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+ list(APPEND _${_key} "${arg}")
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+ else()
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+ message(FATAL_ERROR "Unknown argument:\n ${arg}\n")
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+ endif()
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+ endforeach()
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+ if(NOT _SRC_EXT)
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+ set(_SRC_EXT F90)
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+ endif()
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+ set(MACRO_CHECK_FUNCTION_DEFINITIONS
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+ "-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
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+ if(CMAKE_REQUIRED_LINK_OPTIONS)
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+ set(CHECK_Fortran_SOURCE_COMPILES_ADD_LINK_OPTIONS
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+ LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
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+ else()
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+ set(CHECK_Fortran_SOURCE_COMPILES_ADD_LINK_OPTIONS)
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+ endif()
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+ if(CMAKE_REQUIRED_LIBRARIES)
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+ set(CHECK_Fortran_SOURCE_COMPILES_ADD_LIBRARIES
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+ LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
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+ else()
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+ set(CHECK_Fortran_SOURCE_COMPILES_ADD_LIBRARIES)
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+ endif()
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+ if(CMAKE_REQUIRED_INCLUDES)
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+ set(CHECK_Fortran_SOURCE_COMPILES_ADD_INCLUDES
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+ "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
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+ else()
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+ set(CHECK_Fortran_SOURCE_COMPILES_ADD_INCLUDES)
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+ endif()
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+ file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.${_SRC_EXT}"
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+ "${SOURCE}\n")
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+
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+ if(NOT CMAKE_REQUIRED_QUIET)
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+ message(STATUS "Performing Test ${VAR}")
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+ endif()
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+ try_run(${VAR}_EXITCODE ${VAR}_COMPILED
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+ ${CMAKE_BINARY_DIR}
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+ ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.${_SRC_EXT}
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+ COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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+ ${CHECK_Fortran_SOURCE_COMPILES_ADD_LINK_OPTIONS}
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+ ${CHECK_Fortran_SOURCE_COMPILES_ADD_LIBRARIES}
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+ CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
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+ -DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}
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+ "${CHECK_Fortran_SOURCE_COMPILES_ADD_INCLUDES}"
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+ COMPILE_OUTPUT_VARIABLE OUTPUT)
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+
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+ # if it did not compile make the return value fail code of 1
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+ if(NOT ${VAR}_COMPILED)
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+ set(${VAR}_EXITCODE 1)
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+ endif()
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+ # if the return value was 0 then it worked
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+ if("${${VAR}_EXITCODE}" EQUAL 0)
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+ set(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
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+ if(NOT CMAKE_REQUIRED_QUIET)
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+ message(STATUS "Performing Test ${VAR} - Success")
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+ endif()
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+ file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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+ "Performing Fortran SOURCE FILE Test ${VAR} succeeded with the following output:\n"
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+ "${OUTPUT}\n"
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+ "Return value: ${${VAR}}\n"
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+ "Source file was:\n${SOURCE}\n")
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+ else()
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+ if(CMAKE_CROSSCOMPILING AND "${${VAR}_EXITCODE}" MATCHES "FAILED_TO_RUN")
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+ set(${VAR} "${${VAR}_EXITCODE}")
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+ else()
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+ set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
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+ endif()
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+
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+ if(NOT CMAKE_REQUIRED_QUIET)
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+ message(STATUS "Performing Test ${VAR} - Failed")
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+ endif()
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+ file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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+ "Performing Fortran SOURCE FILE Test ${VAR} failed with the following output:\n"
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+ "${OUTPUT}\n"
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+ "Return value: ${${VAR}_EXITCODE}\n"
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+ "Source file was:\n${SOURCE}\n")
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+ endif()
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+ endif()
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+endmacro()
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Michael Hirsch, Ph.D