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CMake/Modules/FindPythonLibs.cmake
Brad King 86578eccf2 Simplify CMake per-source license notices 
Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool.  Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience.  Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.

Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices.  It also references version control
history for more precise information.  Therefore we no longer need to spell
out the list of Contributors in each source file notice.

Replace CMake per-source copyright/license notice headers with a short
description of the license and links to `Copyright.txt` and online information
available from "https://cmake.org/licensing".  The online URL also handles
cases of modules being copied out of our source into other projects, so we
can drop our notices about replacing links with full license text.

Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority
of the replacements mechanically.  Manually fix up shebang lines and trailing
newlines in a few files.  Manually update the notices in a few files that the
script does not handle.
2016-09-27 15:14:44 -04:00

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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:
# FindPythonLibs
# --------------
#
# Find python libraries
#
# This module finds if Python is installed and determines where the
# include files and libraries are. It also determines what the name of
# the library is. This code sets the following variables:
#
# ::
#
# PYTHONLIBS_FOUND - have the Python libs been found
# PYTHON_LIBRARIES - path to the python library
# PYTHON_INCLUDE_PATH - path to where Python.h is found (deprecated)
# PYTHON_INCLUDE_DIRS - path to where Python.h is found
# PYTHON_DEBUG_LIBRARIES - path to the debug library (deprecated)
# PYTHONLIBS_VERSION_STRING - version of the Python libs found (since CMake 2.8.8)
#
#
#
# The Python_ADDITIONAL_VERSIONS variable can be used to specify a list
# of version numbers that should be taken into account when searching
# for Python. You need to set this variable before calling
# find_package(PythonLibs).
#
# If you'd like to specify the installation of Python to use, you should
# modify the following cache variables:
#
# ::
#
# PYTHON_LIBRARY - path to the python library
# PYTHON_INCLUDE_DIR - path to where Python.h is found
#
# If calling both ``find_package(PythonInterp)`` and
# ``find_package(PythonLibs)``, call ``find_package(PythonInterp)`` first to
# get the currently active Python version by default with a consistent version
# of PYTHON_LIBRARIES.
# Use the executable's path as a hint
set(_Python_LIBRARY_PATH_HINT)
if(PYTHON_EXECUTABLE)
if(WIN32)
get_filename_component(_Python_PREFIX ${PYTHON_EXECUTABLE} PATH)
if(_Python_PREFIX)
set(_Python_LIBRARY_PATH_HINT ${_Python_PREFIX}/libs)
endif()
unset(_Python_PREFIX)
else()
get_filename_component(_Python_PREFIX ${PYTHON_EXECUTABLE} PATH)
get_filename_component(_Python_PREFIX ${_Python_PREFIX} PATH)
if(_Python_PREFIX)
set(_Python_LIBRARY_PATH_HINT ${_Python_PREFIX}/lib)
endif()
unset(_Python_PREFIX)
endif()
endif()
include(${CMAKE_CURRENT_LIST_DIR}/CMakeFindFrameworks.cmake)
# Search for the python framework on Apple.
CMAKE_FIND_FRAMEWORKS(Python)
# Save CMAKE_FIND_FRAMEWORK
if(DEFINED CMAKE_FIND_FRAMEWORK)
set(_PythonLibs_CMAKE_FIND_FRAMEWORK ${CMAKE_FIND_FRAMEWORK})
else()
unset(_PythonLibs_CMAKE_FIND_FRAMEWORK)
endif()
# To avoid picking up the system Python.h pre-maturely.
set(CMAKE_FIND_FRAMEWORK LAST)
set(_PYTHON1_VERSIONS 1.6 1.5)
set(_PYTHON2_VERSIONS 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0)
set(_PYTHON3_VERSIONS 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0)
if(PythonLibs_FIND_VERSION)
if(PythonLibs_FIND_VERSION_COUNT GREATER 1)
set(_PYTHON_FIND_MAJ_MIN "${PythonLibs_FIND_VERSION_MAJOR}.${PythonLibs_FIND_VERSION_MINOR}")
unset(_PYTHON_FIND_OTHER_VERSIONS)
if(PythonLibs_FIND_VERSION_EXACT)
if(_PYTHON_FIND_MAJ_MIN STREQUAL PythonLibs_FIND_VERSION)
set(_PYTHON_FIND_OTHER_VERSIONS "${PythonLibs_FIND_VERSION}")
else()
set(_PYTHON_FIND_OTHER_VERSIONS "${PythonLibs_FIND_VERSION}" "${_PYTHON_FIND_MAJ_MIN}")
endif()
else()
foreach(_PYTHON_V ${_PYTHON${PythonLibs_FIND_VERSION_MAJOR}_VERSIONS})
if(NOT _PYTHON_V VERSION_LESS _PYTHON_FIND_MAJ_MIN)
list(APPEND _PYTHON_FIND_OTHER_VERSIONS ${_PYTHON_V})
endif()
endforeach()
endif()
unset(_PYTHON_FIND_MAJ_MIN)
else()
set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON${PythonLibs_FIND_VERSION_MAJOR}_VERSIONS})
endif()
else()
set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON3_VERSIONS} ${_PYTHON2_VERSIONS} ${_PYTHON1_VERSIONS})
endif()
# Set up the versions we know about, in the order we will search. Always add
# the user supplied additional versions to the front.
# If FindPythonInterp has already found the major and minor version,
# insert that version between the user supplied versions and the stock
# version list.
set(_Python_VERSIONS ${Python_ADDITIONAL_VERSIONS})
if(DEFINED PYTHON_VERSION_MAJOR AND DEFINED PYTHON_VERSION_MINOR)
list(APPEND _Python_VERSIONS ${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR})
endif()
list(APPEND _Python_VERSIONS ${_PYTHON_FIND_OTHER_VERSIONS})
unset(_PYTHON_FIND_OTHER_VERSIONS)
unset(_PYTHON1_VERSIONS)
unset(_PYTHON2_VERSIONS)
unset(_PYTHON3_VERSIONS)
foreach(_CURRENT_VERSION ${_Python_VERSIONS})
string(REPLACE "." "" _CURRENT_VERSION_NO_DOTS ${_CURRENT_VERSION})
if(WIN32)
find_library(PYTHON_DEBUG_LIBRARY
NAMES python${_CURRENT_VERSION_NO_DOTS}_d python
HINTS ${_Python_LIBRARY_PATH_HINT}
PATHS
[HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs/Debug
[HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs/Debug
[HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
[HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
)
endif()
set(PYTHON_FRAMEWORK_LIBRARIES)
if(Python_FRAMEWORKS AND NOT PYTHON_LIBRARY)
foreach(dir ${Python_FRAMEWORKS})
list(APPEND PYTHON_FRAMEWORK_LIBRARIES
${dir}/Versions/${_CURRENT_VERSION}/lib)
endforeach()
endif()
find_library(PYTHON_LIBRARY
NAMES
python${_CURRENT_VERSION_NO_DOTS}
python${_CURRENT_VERSION}mu
python${_CURRENT_VERSION}m
python${_CURRENT_VERSION}u
python${_CURRENT_VERSION}
HINTS
${_Python_LIBRARY_PATH_HINT}
PATHS
${PYTHON_FRAMEWORK_LIBRARIES}
[HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
[HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
# Avoid finding the .dll in the PATH. We want the .lib.
NO_SYSTEM_ENVIRONMENT_PATH
)
# Look for the static library in the Python config directory
find_library(PYTHON_LIBRARY
NAMES python${_CURRENT_VERSION_NO_DOTS} python${_CURRENT_VERSION}
# Avoid finding the .dll in the PATH. We want the .lib.
NO_SYSTEM_ENVIRONMENT_PATH
# This is where the static library is usually located
PATH_SUFFIXES python${_CURRENT_VERSION}/config
)
# Don't search for include dir until library location is known
if(PYTHON_LIBRARY)
# Use the library's install prefix as a hint
set(_Python_INCLUDE_PATH_HINT)
get_filename_component(_Python_PREFIX ${PYTHON_LIBRARY} PATH)
get_filename_component(_Python_PREFIX ${_Python_PREFIX} PATH)
if(_Python_PREFIX)
set(_Python_INCLUDE_PATH_HINT ${_Python_PREFIX}/include)
endif()
unset(_Python_PREFIX)
# Add framework directories to the search paths
set(PYTHON_FRAMEWORK_INCLUDES)
if(Python_FRAMEWORKS AND NOT PYTHON_INCLUDE_DIR)
foreach(dir ${Python_FRAMEWORKS})
list(APPEND PYTHON_FRAMEWORK_INCLUDES
${dir}/Versions/${_CURRENT_VERSION}/include)
endforeach()
endif()
find_path(PYTHON_INCLUDE_DIR
NAMES Python.h
HINTS
${_Python_INCLUDE_PATH_HINT}
PATHS
${PYTHON_FRAMEWORK_INCLUDES}
[HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/include
[HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/include
PATH_SUFFIXES
python${_CURRENT_VERSION}mu
python${_CURRENT_VERSION}m
python${_CURRENT_VERSION}u
python${_CURRENT_VERSION}
)
endif()
# For backward compatibility, set PYTHON_INCLUDE_PATH.
set(PYTHON_INCLUDE_PATH "${PYTHON_INCLUDE_DIR}")
if(PYTHON_INCLUDE_DIR AND EXISTS "${PYTHON_INCLUDE_DIR}/patchlevel.h")
file(STRINGS "${PYTHON_INCLUDE_DIR}/patchlevel.h" python_version_str
REGEX "^#define[ \t]+PY_VERSION[ \t]+\"[^\"]+\"")
string(REGEX REPLACE "^#define[ \t]+PY_VERSION[ \t]+\"([^\"]+)\".*" "\\1"
PYTHONLIBS_VERSION_STRING "${python_version_str}")
unset(python_version_str)
endif()
if(PYTHON_LIBRARY AND PYTHON_INCLUDE_DIR)
break()
endif()
endforeach()
unset(_Python_INCLUDE_PATH_HINT)
unset(_Python_LIBRARY_PATH_HINT)
mark_as_advanced(
PYTHON_DEBUG_LIBRARY
PYTHON_LIBRARY
PYTHON_INCLUDE_DIR
)
# We use PYTHON_INCLUDE_DIR, PYTHON_LIBRARY and PYTHON_DEBUG_LIBRARY for the
# cache entries because they are meant to specify the location of a single
# library. We now set the variables listed by the documentation for this
# module.
set(PYTHON_INCLUDE_DIRS "${PYTHON_INCLUDE_DIR}")
set(PYTHON_DEBUG_LIBRARIES "${PYTHON_DEBUG_LIBRARY}")
# These variables have been historically named in this module different from
# what SELECT_LIBRARY_CONFIGURATIONS() expects.
set(PYTHON_LIBRARY_DEBUG "${PYTHON_DEBUG_LIBRARY}")
set(PYTHON_LIBRARY_RELEASE "${PYTHON_LIBRARY}")
include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
SELECT_LIBRARY_CONFIGURATIONS(PYTHON)
# SELECT_LIBRARY_CONFIGURATIONS() sets ${PREFIX}_FOUND if it has a library.
# Unset this, this prefix doesn't match the module prefix, they are different
# for historical reasons.
unset(PYTHON_FOUND)
# Restore CMAKE_FIND_FRAMEWORK
if(DEFINED _PythonLibs_CMAKE_FIND_FRAMEWORK)
set(CMAKE_FIND_FRAMEWORK ${_PythonLibs_CMAKE_FIND_FRAMEWORK})
unset(_PythonLibs_CMAKE_FIND_FRAMEWORK)
else()
unset(CMAKE_FIND_FRAMEWORK)
endif()
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonLibs
REQUIRED_VARS PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS
VERSION_VAR PYTHONLIBS_VERSION_STRING)
# PYTHON_ADD_MODULE(<name> src1 src2 ... srcN) is used to build modules for python.
# PYTHON_WRITE_MODULES_HEADER(<filename>) writes a header file you can include
# in your sources to initialize the static python modules
function(PYTHON_ADD_MODULE _NAME )
get_property(_TARGET_SUPPORTS_SHARED_LIBS
GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS)
option(PYTHON_ENABLE_MODULE_${_NAME} "Add module ${_NAME}" TRUE)
option(PYTHON_MODULE_${_NAME}_BUILD_SHARED
"Add module ${_NAME} shared" ${_TARGET_SUPPORTS_SHARED_LIBS})
# Mark these options as advanced
mark_as_advanced(PYTHON_ENABLE_MODULE_${_NAME}
PYTHON_MODULE_${_NAME}_BUILD_SHARED)
if(PYTHON_ENABLE_MODULE_${_NAME})
if(PYTHON_MODULE_${_NAME}_BUILD_SHARED)
set(PY_MODULE_TYPE MODULE)
else()
set(PY_MODULE_TYPE STATIC)
set_property(GLOBAL APPEND PROPERTY PY_STATIC_MODULES_LIST ${_NAME})
endif()
set_property(GLOBAL APPEND PROPERTY PY_MODULES_LIST ${_NAME})
add_library(${_NAME} ${PY_MODULE_TYPE} ${ARGN})
# target_link_libraries(${_NAME} ${PYTHON_LIBRARIES})
if(PYTHON_MODULE_${_NAME}_BUILD_SHARED)
set_target_properties(${_NAME} PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}")
if(WIN32 AND NOT CYGWIN)
set_target_properties(${_NAME} PROPERTIES SUFFIX ".pyd")
endif()
endif()
endif()
endfunction()
function(PYTHON_WRITE_MODULES_HEADER _filename)
get_property(PY_STATIC_MODULES_LIST GLOBAL PROPERTY PY_STATIC_MODULES_LIST)
get_filename_component(_name "${_filename}" NAME)
string(REPLACE "." "_" _name "${_name}")
string(TOUPPER ${_name} _nameUpper)
set(_filename ${CMAKE_CURRENT_BINARY_DIR}/${_filename})
set(_filenameTmp "${_filename}.in")
file(WRITE ${_filenameTmp} "/*Created by cmake, do not edit, changes will be lost*/\n")
file(APPEND ${_filenameTmp}
"#ifndef ${_nameUpper}
#define ${_nameUpper}
#include <Python.h>
#ifdef __cplusplus
extern \"C\" {
#endif /* __cplusplus */
")
foreach(_currentModule ${PY_STATIC_MODULES_LIST})
file(APPEND ${_filenameTmp} "extern void init${PYTHON_MODULE_PREFIX}${_currentModule}(void);\n\n")
endforeach()
file(APPEND ${_filenameTmp}
"#ifdef __cplusplus
}
#endif /* __cplusplus */
")
foreach(_currentModule ${PY_STATIC_MODULES_LIST})
file(APPEND ${_filenameTmp} "int ${_name}_${_currentModule}(void) \n{\n static char name[]=\"${PYTHON_MODULE_PREFIX}${_currentModule}\"; return PyImport_AppendInittab(name, init${PYTHON_MODULE_PREFIX}${_currentModule});\n}\n\n")
endforeach()
file(APPEND ${_filenameTmp} "void ${_name}_LoadAllPythonModules(void)\n{\n")
foreach(_currentModule ${PY_STATIC_MODULES_LIST})
file(APPEND ${_filenameTmp} " ${_name}_${_currentModule}();\n")
endforeach()
file(APPEND ${_filenameTmp} "}\n\n")
file(APPEND ${_filenameTmp} "#ifndef EXCLUDE_LOAD_ALL_FUNCTION\nvoid CMakeLoadAllPythonModules(void)\n{\n ${_name}_LoadAllPythonModules();\n}\n#endif\n\n#endif\n")
# with configure_file() cmake complains that you may not use a file created using file(WRITE) as input file for configure_file()
execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different "${_filenameTmp}" "${_filename}" OUTPUT_QUIET ERROR_QUIET)
endfunction()
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