summaryrefslogtreecommitdiffstats
path: root/Modules/FindSWIG.cmake
blob: 370fff05f7365677156c219c0b69a0d21a843d38 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
# 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)