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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()
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