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e131d9f974
Newer versions of SWIG drop support for some target languages, and some forks of SWIG (such as for Fortran and MATLAB) aren't supported by the mainline version of SWIG. Swig versions as old as 1.3.6 (circa 2001) and possibly older use the same format for listing available wrappers "%-15s - Generate %s wrappers", so component detection should be quite reliable.
111 lines
4.2 KiB
CMake
111 lines
4.2 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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FindSWIG
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--------
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Find the Simplified Wrapper and Interface Generator (SWIG_) executable.
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This module finds an installed SWIG and determines its version. If a
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``COMPONENTS`` or ``OPTIONAL_COMPONENTS`` argument is given to ``find_package``,
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it will also determine supported target languages. The module sents the
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following variables:
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``SWIG_FOUND``
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Whether SWIG and any required components were found on the system.
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``SWIG_EXECUTABLE``
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Path to the SWIG executable.
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``SWIG_DIR``
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Path to the installed SWIG ``Lib`` directory (result of ``swig -swiglib``).
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``SWIG_VERSION``
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SWIG executable version (result of ``swig -version``).
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``SWIG_<lang>_FOUND``
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If ``COMPONENTS`` or ``OPTIONAL_COMPONENTS`` are requested, each available
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target language ``<lang>`` (lowercase) will be set to TRUE.
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Any ``COMPONENTS`` given to ``find_package`` should be the names of supported
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target languages as provided to the LANGUAGE argument of ``swig_add_library``,
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such as ``python`` or ``perl5``. Language names *must* be lowercase.
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All information is collected from the ``SWIG_EXECUTABLE``, so the version
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to be found can be changed from the command line by means of setting
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``SWIG_EXECUTABLE``.
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Example usage requiring SWIG 4.0 or higher and Python language support, with
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optional Fortran support:
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.. code-block:: cmake
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find_package(SWIG 4.0 COMPONENTS python OPTIONAL_COMPONENTS fortran)
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if(SWIG_FOUND)
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message("SWIG found: ${SWIG_EXECUTABLE}")
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if(NOT SWIG_fortran_FOUND)
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message(WARNING "SWIG Fortran bindings cannot be generated")
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endif()
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endif()
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.. _`SWIG`: http://swig.org
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#]=======================================================================]
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find_program(SWIG_EXECUTABLE NAMES swig4.0 swig3.0 swig2.0 swig)
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if(SWIG_EXECUTABLE)
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execute_process(COMMAND ${SWIG_EXECUTABLE} -swiglib
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OUTPUT_VARIABLE SWIG_swiglib_output
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ERROR_VARIABLE SWIG_swiglib_error
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RESULT_VARIABLE SWIG_swiglib_result)
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if(SWIG_swiglib_result)
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if(SWIG_FIND_REQUIRED)
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message(SEND_ERROR "Command \"${SWIG_EXECUTABLE} -swiglib\" failed with output:\n${SWIG_swiglib_error}")
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else()
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message(STATUS "Command \"${SWIG_EXECUTABLE} -swiglib\" failed with output:\n${SWIG_swiglib_error}")
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endif()
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else()
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string(REGEX REPLACE "[\n\r]+" ";" SWIG_swiglib_output ${SWIG_swiglib_output})
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find_path(SWIG_DIR swig.swg PATHS ${SWIG_swiglib_output} NO_CMAKE_FIND_ROOT_PATH)
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if(SWIG_DIR)
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set(SWIG_USE_FILE ${CMAKE_CURRENT_LIST_DIR}/UseSWIG.cmake)
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execute_process(COMMAND ${SWIG_EXECUTABLE} -version
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OUTPUT_VARIABLE SWIG_version_output
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ERROR_VARIABLE SWIG_version_output
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RESULT_VARIABLE SWIG_version_result)
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if(SWIG_version_result)
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message(SEND_ERROR "Command \"${SWIG_EXECUTABLE} -version\" failed with output:\n${SWIG_version_output}")
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else()
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string(REGEX REPLACE ".*SWIG Version[^0-9.]*\([0-9.]+\).*" "\\1"
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SWIG_version_output "${SWIG_version_output}")
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set(SWIG_VERSION ${SWIG_version_output} CACHE STRING "Swig version" FORCE)
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endif()
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endif()
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endif()
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if(SWIG_FIND_COMPONENTS)
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execute_process(COMMAND ${SWIG_EXECUTABLE} -help
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OUTPUT_VARIABLE SWIG_swighelp_output
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ERROR_VARIABLE SWIG_swighelp_error
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RESULT_VARIABLE SWIG_swighelp_result)
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if(SWIG_swighelp_result)
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message(SEND_ERROR "Command \"${SWIG_EXECUTABLE} -help\" failed with output:\n${SWIG_swiglib_error}")
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else()
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string(REPLACE "\n" ";" SWIG_swighelp_output "${SWIG_swighelp_output}")
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foreach(SWIG_line IN LISTS SWIG_swighelp_output)
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if(SWIG_line MATCHES "-([A-Za-z0-9_]+) +- *Generate.*wrappers")
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set(SWIG_${CMAKE_MATCH_1}_FOUND TRUE)
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endif()
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endforeach()
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endif()
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endif()
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endif()
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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find_package_handle_standard_args(
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SWIG HANDLE_COMPONENTS
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REQUIRED_VARS SWIG_EXECUTABLE SWIG_DIR
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VERSION_VAR SWIG_VERSION)
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mark_as_advanced(SWIG_DIR SWIG_VERSION SWIG_EXECUTABLE)
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