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