1 # - Find python libraries
2 # This module finds the libraries corresponding to the Python interpreter
3 # FindPythonInterp provides.
4 # This code sets the following variables:
6 # PYTHONLIBS_FOUND - have the Python libs been found
7 # PYTHON_PREFIX - path to the Python installation
8 # PYTHON_LIBRARIES - path to the python library
9 # PYTHON_INCLUDE_DIRS - path to where Python.h is found
10 # PYTHON_MODULE_EXTENSION - lib extension, e.g. '.so' or '.pyd'
11 # PYTHON_MODULE_PREFIX - lib name prefix: usually an empty string
12 # PYTHON_SITE_PACKAGES - path to installation site-packages
13 # PYTHON_IS_DEBUG - whether the Python interpreter is a debug build
15 # Thanks to talljimbo for the patch adding the 'LDVERSION' config
18 #=============================================================================
19 # Copyright 2001-2009 Kitware, Inc.
20 # Copyright 2012 Continuum Analytics, Inc.
22 # All rights reserved.
24 # Redistribution and use in source and binary forms, with or without
25 # modification, are permitted provided that the following conditions
28 # * Redistributions of source code must retain the above copyright
29 # notice, this list of conditions and the following disclaimer.
31 # * Redistributions in binary form must reproduce the above copyright
32 # notice, this list of conditions and the following disclaimer in the
33 # documentation and/or other materials provided with the distribution.
35 # * Neither the names of Kitware, Inc., the Insight Software Consortium,
36 # nor the names of their contributors may be used to endorse or promote
37 # products derived from this software without specific prior written
40 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
41 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
42 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
43 # # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
44 # HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
46 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
47 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
48 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
49 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
50 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
51 #=============================================================================
53 # Checking for the extension makes sure that `LibsNew` was found and not just `Libs`.
54 if(PYTHONLIBS_FOUND AND PYTHON_MODULE_EXTENSION)
58 # Use the Python interpreter to find the libs.
59 if(PythonLibsNew_FIND_REQUIRED)
60 find_package(PythonInterp ${PythonLibsNew_FIND_VERSION} REQUIRED)
62 find_package(PythonInterp ${PythonLibsNew_FIND_VERSION})
65 if(NOT PYTHONINTERP_FOUND)
66 set(PYTHONLIBS_FOUND FALSE)
70 # According to http://stackoverflow.com/questions/646518/python-how-to-detect-debug-interpreter
71 # testing whether sys has the gettotalrefcount function is a reliable, cross-platform
72 # way to detect a CPython debug interpreter.
74 # The library suffix is from the config var LDVERSION sometimes, otherwise
75 # VERSION. VERSION will typically be like "2.7" on unix, and "27" on windows.
76 execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c"
77 "from distutils import sysconfig as s;import sys;import struct;
78 print('.'.join(str(v) for v in sys.version_info));
80 print(s.get_python_inc(plat_specific=True));
81 print(s.get_python_lib(plat_specific=True));
82 print(s.get_config_var('SO'));
83 print(hasattr(sys, 'gettotalrefcount')+0);
84 print(struct.calcsize('@P'));
85 print(s.get_config_var('LDVERSION') or s.get_config_var('VERSION'));
86 print(s.get_config_var('LIBDIR') or '');
87 print(s.get_config_var('MULTIARCH') or '');
89 RESULT_VARIABLE _PYTHON_SUCCESS
90 OUTPUT_VARIABLE _PYTHON_VALUES
91 ERROR_VARIABLE _PYTHON_ERROR_VALUE)
93 if(NOT _PYTHON_SUCCESS MATCHES 0)
94 if(PythonLibsNew_FIND_REQUIRED)
96 "Python config failure:\n${_PYTHON_ERROR_VALUE}")
98 set(PYTHONLIBS_FOUND FALSE)
102 # Convert the process output into a list
103 string(REGEX REPLACE ";" "\\\\;" _PYTHON_VALUES ${_PYTHON_VALUES})
104 string(REGEX REPLACE "\n" ";" _PYTHON_VALUES ${_PYTHON_VALUES})
105 list(GET _PYTHON_VALUES 0 _PYTHON_VERSION_LIST)
106 list(GET _PYTHON_VALUES 1 PYTHON_PREFIX)
107 list(GET _PYTHON_VALUES 2 PYTHON_INCLUDE_DIR)
108 list(GET _PYTHON_VALUES 3 PYTHON_SITE_PACKAGES)
109 list(GET _PYTHON_VALUES 4 PYTHON_MODULE_EXTENSION)
110 list(GET _PYTHON_VALUES 5 PYTHON_IS_DEBUG)
111 list(GET _PYTHON_VALUES 6 PYTHON_SIZEOF_VOID_P)
112 list(GET _PYTHON_VALUES 7 PYTHON_LIBRARY_SUFFIX)
113 list(GET _PYTHON_VALUES 8 PYTHON_LIBDIR)
114 list(GET _PYTHON_VALUES 9 PYTHON_MULTIARCH)
116 # Make sure the Python has the same pointer-size as the chosen compiler
117 # Skip if CMAKE_SIZEOF_VOID_P is not defined
118 if(CMAKE_SIZEOF_VOID_P AND (NOT "${PYTHON_SIZEOF_VOID_P}" STREQUAL "${CMAKE_SIZEOF_VOID_P}"))
119 if(PythonLibsNew_FIND_REQUIRED)
120 math(EXPR _PYTHON_BITS "${PYTHON_SIZEOF_VOID_P} * 8")
121 math(EXPR _CMAKE_BITS "${CMAKE_SIZEOF_VOID_P} * 8")
123 "Python config failure: Python is ${_PYTHON_BITS}-bit, "
124 "chosen compiler is ${_CMAKE_BITS}-bit")
126 set(PYTHONLIBS_FOUND FALSE)
130 # The built-in FindPython didn't always give the version numbers
131 string(REGEX REPLACE "\\." ";" _PYTHON_VERSION_LIST ${_PYTHON_VERSION_LIST})
132 list(GET _PYTHON_VERSION_LIST 0 PYTHON_VERSION_MAJOR)
133 list(GET _PYTHON_VERSION_LIST 1 PYTHON_VERSION_MINOR)
134 list(GET _PYTHON_VERSION_LIST 2 PYTHON_VERSION_PATCH)
136 # Make sure all directory separators are '/'
137 string(REGEX REPLACE "\\\\" "/" PYTHON_PREFIX ${PYTHON_PREFIX})
138 string(REGEX REPLACE "\\\\" "/" PYTHON_INCLUDE_DIR ${PYTHON_INCLUDE_DIR})
139 string(REGEX REPLACE "\\\\" "/" PYTHON_SITE_PACKAGES ${PYTHON_SITE_PACKAGES})
143 "${PYTHON_PREFIX}/libs/Python${PYTHON_LIBRARY_SUFFIX}.lib")
145 # when run in a venv, PYTHON_PREFIX points to it. But the libraries remain in the
146 # original python installation. They may be found relative to PYTHON_INCLUDE_DIR.
147 if(NOT EXISTS "${PYTHON_LIBRARY}")
148 get_filename_component(_PYTHON_ROOT ${PYTHON_INCLUDE_DIR} DIRECTORY)
150 "${_PYTHON_ROOT}/libs/Python${PYTHON_LIBRARY_SUFFIX}.lib")
153 # raise an error if the python libs are still not found.
154 if(NOT EXISTS "${PYTHON_LIBRARY}")
155 message(FATAL_ERROR "Python libraries not found")
160 set(_PYTHON_LIBS_SEARCH "${PYTHON_LIBDIR}/${PYTHON_MULTIARCH}" "${PYTHON_LIBDIR}")
162 set(_PYTHON_LIBS_SEARCH "${PYTHON_LIBDIR}")
164 #message(STATUS "Searching for Python libs in ${_PYTHON_LIBS_SEARCH}")
165 # Probably this needs to be more involved. It would be nice if the config
166 # information the python interpreter itself gave us were more complete.
167 find_library(PYTHON_LIBRARY
168 NAMES "python${PYTHON_LIBRARY_SUFFIX}"
169 PATHS ${_PYTHON_LIBS_SEARCH}
172 # If all else fails, just set the name/version and let the linker figure out the path.
173 if(NOT PYTHON_LIBRARY)
174 set(PYTHON_LIBRARY python${PYTHON_LIBRARY_SUFFIX})
183 # We use PYTHON_INCLUDE_DIR, PYTHON_LIBRARY and PYTHON_DEBUG_LIBRARY for the
184 # cache entries because they are meant to specify the location of a single
185 # library. We now set the variables listed by the documentation for this
187 SET(PYTHON_INCLUDE_DIRS "${PYTHON_INCLUDE_DIR}")
188 SET(PYTHON_LIBRARIES "${PYTHON_LIBRARY}")
189 SET(PYTHON_DEBUG_LIBRARIES "${PYTHON_DEBUG_LIBRARY}")
191 find_package_message(PYTHON
192 "Found PythonLibs: ${PYTHON_LIBRARY}"
193 "${PYTHON_EXECUTABLE}${PYTHON_VERSION}")
195 set(PYTHONLIBS_FOUND TRUE)