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+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+CheckFortranSourceCompiles
+--------------------------
+
+.. versionadded:: 3.1
+
+Check if given Fortran source compiles and links into an executable.
+
+.. command:: check_fortran_source_compiles
+
+  .. code-block:: cmake
+
+    check_fortran_source_compiles(<code> <resultVar>
+        [FAIL_REGEX <regex>...]
+        [SRC_EXT <extension>]
+    )
+
+  Checks that the source supplied in ``<code>`` can be compiled as a Fortran
+  source file and linked as an executable. The ``<code>`` must be a Fortran program
+  containing at least an ``end`` statement--for example:
+
+  .. code-block:: cmake
+
+    check_fortran_source_compiles("character :: b; error stop b; end" F2018ESTOPOK SRC_EXT F90)
+
+  This command can help avoid costly build processes when a compiler lacks support
+  for a necessary feature, or a particular vendor library is not compatible with
+  the Fortran compiler version being used. This generate-time check may advise the
+  user of such before the main build process. See also the
+  :command:`check_fortran_source_runs` command to actually run the compiled code.
+
+  The result will be stored in the internal cache
+  variable ``<resultVar>``, with a boolean true value for success and boolean
+  false for failure.
+
+  If ``FAIL_REGEX`` is provided, then failure is determined by checking
+  if anything in the output matches any of the specified regular expressions.
+
+  By default, the test source file will be given a ``.F`` file extension. The
+  ``SRC_EXT`` option can be used to override this with ``.<extension>`` instead--
+  ``.F90`` is a typical choice.
+
+  The underlying check is performed by the :command:`try_compile` command. The
+  compile and link commands can be influenced by setting any of the following
+  variables prior to calling ``check_fortran_source_compiles()``:
+
+  ``CMAKE_REQUIRED_FLAGS``
+    Additional flags to pass to the compiler. Note that the contents of
+    :variable:`CMAKE_Fortran_FLAGS <CMAKE_<LANG>_FLAGS>` and its associated
+    configuration-specific variable are automatically added to the compiler
+    command before the contents of ``CMAKE_REQUIRED_FLAGS``.
+
+  ``CMAKE_REQUIRED_DEFINITIONS``
+    A :ref:`;-list <CMake Language Lists>` of compiler definitions of the form
+    ``-DFOO`` or ``-DFOO=bar``. A definition for the name specified by
+    ``<resultVar>`` will also be added automatically.
+
+  ``CMAKE_REQUIRED_INCLUDES``
+    A :ref:`;-list <CMake Language Lists>` of header search paths to pass to
+    the compiler. These will be the only header search paths used by
+    ``try_compile()``, i.e. the contents of the :prop_dir:`INCLUDE_DIRECTORIES`
+    directory property will be ignored.
+
+  ``CMAKE_REQUIRED_LINK_OPTIONS``
+    .. versionadded:: 3.14
+
+    A :ref:`;-list <CMake Language Lists>` of options to add to the link
+    command (see :command:`try_compile` for further details).
+
+  ``CMAKE_REQUIRED_LIBRARIES``
+    A :ref:`;-list <CMake Language Lists>` of libraries to add to the link
+    command. These can be the name of system libraries or they can be
+    :ref:`Imported Targets <Imported Targets>` (see :command:`try_compile` for
+    further details).
+
+  ``CMAKE_REQUIRED_QUIET``
+    If this variable evaluates to a boolean true value, all status messages
+    associated with the check will be suppressed.
+
+  The check is only performed once, with the result cached in the variable
+  named by ``<resultVar>``. Every subsequent CMake run will re-use this cached
+  value rather than performing the check again, even if the ``<code>`` changes.
+  In order to force the check to be re-evaluated, the variable named by
+  ``<resultVar>`` must be manually removed from the cache.
+
+#]=======================================================================]
+
+include_guard(GLOBAL)
+include(Internal/CheckSourceCompiles)
+
+macro(CHECK_Fortran_SOURCE_COMPILES SOURCE VAR)
+  # Pass the SRC_EXT we used by default historically.
+  # A user-provided SRC_EXT argument in ARGN will override ours.
+  cmake_check_source_compiles(Fortran "${SOURCE}" ${VAR} SRC_EXT "F" ${ARGN})
+endmacro()