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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.
.. versionadded:: 3.18
If a ``COMPONENTS`` or ``OPTIONAL_COMPONENTS`` argument is given to the
:command:`find_package` command, it will also determine supported target
languages.
.. versionadded:: 3.19
When a version is requested, it can be specified as a simple value or as a
range. For a detailed description of version range usage and capabilities,
refer to the :command:`find_package` command.
The module defines 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: ${SWIG_EXECUTABLE}")
if(NOT SWIG_fortran_FOUND)
message(WARNING "SWIG Fortran bindings cannot be generated")
endif()
endif()
.. _SWIG: https://swig.org
#]=======================================================================]
# compute list of possible names
unset (_SWIG_NAMES)
if (SWIG_FIND_VERSION_RANGE)
foreach (_SWIG_MAJOR IN ITEMS 4 3 2)
if (_SWIG_MAJOR VERSION_GREATER_EQUAL SWIG_FIND_VERSION_MIN_MAJOR
AND ((SWIG_FIND_VERSION_RANGE_MAX STREQUAL "INCLUDE" AND _SWIG_MAJOR VERSION_LESS_EQUAL SWIG_FIND_VERSION_MAX)
OR (SWIG_FIND_VERSION_RANGE_MAX STREQUAL "EXCLUDE" AND _SWIG_MAJOR VERSION_LESS SWIG_FIND_VERSION_MAX)))
list (APPEND _SWIG_NAMES swig${_SWIG_MAJOR}.0)
endif()
endforeach()
elseif(SWIG_FIND_VERSION)
if (SWIG_FIND_VERSION_EXACT)
set(_SWIG_NAMES swig${SWIG_FIND_VERSION_MAJOR}.0)
else()
foreach (_SWIG_MAJOR IN ITEMS 4 3 2)
if (_SWIG_MAJOR VERSION_GREATER_EQUAL SWIG_FIND_VERSION_MAJOR)
list (APPEND _SWIG_NAMES swig${_SWIG_MAJOR}.0)
endif()
endforeach()
endif()
else()
set (_SWIG_NAMES swig4.0 swig3.0 swig2.0)
endif()
if (NOT _SWIG_NAMES)
# try to find any version
set (_SWIG_NAMES swig4.0 swig3.0 swig2.0)
endif()
find_program(SWIG_EXECUTABLE NAMES ${_SWIG_NAMES} swig)
unset(_SWIG_NAMES)
if(SWIG_EXECUTABLE AND NOT SWIG_DIR)
# Find default value for SWIG library directory
execute_process(COMMAND "${SWIG_EXECUTABLE}" -swiglib
OUTPUT_VARIABLE _swig_output
ERROR_VARIABLE _swig_error
RESULT_VARIABLE _swig_result)
if(_swig_result)
set(_msg "Command \"${SWIG_EXECUTABLE} -swiglib\" failed with output:\n${_swig_error}")
if(SWIG_FIND_REQUIRED)
message(SEND_ERROR "${_msg}")
else()
message(STATUS "${_msg}")
endif()
unset(_msg)
else()
string(REGEX REPLACE "[\n\r]+" ";" _SWIG_LIB ${_swig_output})
endif()
# Find SWIG library directory
find_path(SWIG_DIR swig.swg PATHS ${_SWIG_LIB} NO_CMAKE_FIND_ROOT_PATH)
unset(_SWIG_LIB)
endif()
if(SWIG_EXECUTABLE AND SWIG_DIR AND NOT SWIG_VERSION)
# Determine SWIG version
execute_process(COMMAND "${SWIG_EXECUTABLE}" -version
OUTPUT_VARIABLE _swig_output
ERROR_VARIABLE _swig_output
RESULT_VARIABLE _swig_result)
if(_swig_result)
message(SEND_ERROR "Command \"${SWIG_EXECUTABLE} -version\" failed with output:\n${_swig_output}")
else()
string(REGEX REPLACE ".*SWIG Version[^0-9.]*\([0-9.]+\).*" "\\1"
_swig_output "${_swig_output}")
set(SWIG_VERSION ${_swig_output} CACHE STRING "Swig version" FORCE)
endif()
endif()
if(SWIG_EXECUTABLE AND SWIG_FIND_COMPONENTS)
execute_process(COMMAND "${SWIG_EXECUTABLE}" -help
OUTPUT_VARIABLE _swig_output
ERROR_VARIABLE _swig_error
RESULT_VARIABLE _swig_result)
if(_swig_result)
message(SEND_ERROR "Command \"${SWIG_EXECUTABLE} -help\" failed with output:\n${_swig_error}")
else()
string(REPLACE "\n" ";" _swig_output "${_swig_output}")
foreach(SWIG_line IN LISTS _swig_output)
if(SWIG_line MATCHES "-([A-Za-z0-9_]+) +- *Generate.*wrappers")
set(SWIG_${CMAKE_MATCH_1}_FOUND TRUE)
endif()
endforeach()
endif()
endif()
unset(_swig_output)
unset(_swig_error)
unset(_swig_result)
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
find_package_handle_standard_args(
SWIG HANDLE_COMPONENTS
REQUIRED_VARS SWIG_EXECUTABLE SWIG_DIR
VERSION_VAR SWIG_VERSION
HANDLE_VERSION_RANGE)
if(SWIG_FOUND)
set(SWIG_USE_FILE "${CMAKE_CURRENT_LIST_DIR}/UseSWIG.cmake")
endif()
mark_as_advanced(SWIG_DIR SWIG_VERSION SWIG_EXECUTABLE)
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