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98 lines
4.1 KiB
CMake
98 lines
4.1 KiB
CMake
# 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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#[=======================================================================[.rst:
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CheckFortranSourceCompiles
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--------------------------
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.. versionadded:: 3.1
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Check if given Fortran source compiles and links into an executable.
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.. command:: check_fortran_source_compiles
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.. code-block:: cmake
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check_fortran_source_compiles(<code> <resultVar>
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[FAIL_REGEX <regex>...]
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[SRC_EXT <extension>]
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)
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Checks that the source supplied in ``<code>`` can be compiled as a Fortran
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source file and linked as an executable. The ``<code>`` must be a Fortran program
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containing at least an ``end`` statement--for example:
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.. code-block:: cmake
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check_fortran_source_compiles("character :: b; error stop b; end" F2018ESTOPOK SRC_EXT F90)
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This command can help avoid costly build processes when a compiler lacks support
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for a necessary feature, or a particular vendor library is not compatible with
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the Fortran compiler version being used. This generate-time check may advise the
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user of such before the main build process. See also the
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:command:`check_fortran_source_runs` command to actually run the compiled code.
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The result will be stored in the internal cache
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variable ``<resultVar>``, with a boolean true value for success and boolean
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false for failure.
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If ``FAIL_REGEX`` is provided, then failure is determined by checking
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if anything in the output matches any of the specified regular expressions.
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By default, the test source file will be given a ``.F`` file extension. The
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``SRC_EXT`` option can be used to override this with ``.<extension>`` instead--
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``.F90`` is a typical choice.
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The underlying check is performed by the :command:`try_compile` 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_compiles()``:
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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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``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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``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_compile()``, i.e. the contents of the :prop_dir:`INCLUDE_DIRECTORIES`
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directory property will be ignored.
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``CMAKE_REQUIRED_LINK_OPTIONS``
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.. versionadded:: 3.14
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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_compile` for further details).
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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_compile` for
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further details).
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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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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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include_guard(GLOBAL)
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include(Internal/CheckSourceCompiles)
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macro(CHECK_Fortran_SOURCE_COMPILES SOURCE VAR)
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# Pass the SRC_EXT we used by default historically.
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# A user-provided SRC_EXT argument in ARGN will override ours.
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cmake_check_source_compiles(Fortran "${SOURCE}" ${VAR} SRC_EXT "F" ${ARGN})
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endmacro()
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