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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
---------------------------
-
-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``
- 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)
-
-macro(CHECK_Fortran_SOURCE_COMPILES SOURCE VAR)
- if(NOT DEFINED "${VAR}")
- set(_FAIL_REGEX)
- set(_SRC_EXT)
- set(_key)
- foreach(arg ${ARGN})
- if("${arg}" MATCHES "^(FAIL_REGEX|SRC_EXT)$")
- set(_key "${arg}")
- elseif(_key)
- list(APPEND _${_key} "${arg}")
- else()
- message(FATAL_ERROR "Unknown argument:\n ${arg}\n")
- endif()
- endforeach()
- if(NOT _SRC_EXT)
- set(_SRC_EXT F)
- endif()
- if(CMAKE_REQUIRED_LINK_OPTIONS)
- set(CHECK_Fortran_SOURCE_COMPILES_ADD_LINK_OPTIONS
- LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
- else()
- set(CHECK_Fortran_SOURCE_COMPILES_ADD_LINK_OPTIONS)
- endif()
- if(CMAKE_REQUIRED_LIBRARIES)
- set(CHECK_Fortran_SOURCE_COMPILES_ADD_LIBRARIES
- LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
- else()
- set(CHECK_Fortran_SOURCE_COMPILES_ADD_LIBRARIES)
- endif()
- if(CMAKE_REQUIRED_INCLUDES)
- set(CHECK_Fortran_SOURCE_COMPILES_ADD_INCLUDES
- "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
- else()
- set(CHECK_Fortran_SOURCE_COMPILES_ADD_INCLUDES)
- endif()
- file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.${_SRC_EXT}"
- "${SOURCE}\n")
-
- if(NOT CMAKE_REQUIRED_QUIET)
- message(CHECK_START "Performing Test ${VAR}")
- endif()
- try_compile(${VAR}
- ${CMAKE_BINARY_DIR}
- ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.${_SRC_EXT}
- COMPILE_DEFINITIONS -D${VAR} ${CMAKE_REQUIRED_DEFINITIONS}
- ${CHECK_Fortran_SOURCE_COMPILES_ADD_LINK_OPTIONS}
- ${CHECK_Fortran_SOURCE_COMPILES_ADD_LIBRARIES}
- CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS}
- "${CHECK_Fortran_SOURCE_COMPILES_ADD_INCLUDES}"
- OUTPUT_VARIABLE OUTPUT)
-
- foreach(_regex ${_FAIL_REGEX})
- if("${OUTPUT}" MATCHES "${_regex}")
- set(${VAR} 0)
- endif()
- endforeach()
-
- if(${VAR})
- set(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
- if(NOT CMAKE_REQUIRED_QUIET)
- message(CHECK_PASS "Success")
- endif()
- file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
- "Performing Fortran SOURCE FILE Test ${VAR} succeeded with the following output:\n"
- "${OUTPUT}\n"
- "Source file was:\n${SOURCE}\n")
- else()
- if(NOT CMAKE_REQUIRED_QUIET)
- message(CHECK_FAIL "Failed")
- endif()
- set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
- file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
- "Performing Fortran SOURCE FILE Test ${VAR} failed with the following output:\n"
- "${OUTPUT}\n"
- "Source file was:\n${SOURCE}\n")
- endif()
- endif()
-endmacro()