cmake/Modules/FindPythonLibs.cmake

# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FindPythonLibs
--------------

.. versionchanged:: 3.27
  This module is available only if policy :policy:`CMP0148` is not set to ``NEW``.

.. deprecated:: 3.12

  Use :module:`FindPython3`, :module:`FindPython2` or :module:`FindPython` instead.

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.
#]=======================================================================]

cmake_policy(PUSH)
cmake_policy(SET CMP0159 NEW) # file(STRINGS) with REGEX updates CMAKE_MATCH_<n>

cmake_policy(GET CMP0148 _FindPythonLibs_CMP0148)
if(_FindPythonLibs_CMP0148 STREQUAL "NEW")
  message(FATAL_ERROR "The FindPythonLibs module has been removed by policy CMP0148.")
endif()

if(_FindPythonLibs_testing)
  set(_FindPythonLibs_included TRUE)
  cmake_policy(POP)
  return()
endif()

# Use the executable's path as a hint
set(_Python_LIBRARY_PATH_HINT)
if(IS_ABSOLUTE "${PYTHON_EXECUTABLE}")
  if(WIN32)
    get_filename_component(_Python_PREFIX "${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()

block(SCOPE_FOR POLICIES)
  cmake_policy(SET CMP0173 OLD)
  include(${CMAKE_CURRENT_LIST_DIR}/CMakeFindFrameworks.cmake)
endblock()
# 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 3.14 3.13 3.12 3.11 3.10 3.9 3.8 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)

# Python distribution: define which architectures can be used
if (CMAKE_SIZEOF_VOID_P)
  # In this case, search only for 64bit or 32bit
  math (EXPR _PYTHON_ARCH "${CMAKE_SIZEOF_VOID_P} * 8")
  set (_PYTHON_ARCH2 _PYTHON_PREFIX_ARCH})
else()
  if (PYTHON_EXECUTABLE)
    # determine interpreter architecture
    execute_process (COMMAND "${PYTHON_EXECUTABLE}" -c "import sys; print(sys.maxsize > 2**32)"
                     RESULT_VARIABLE _PYTHON_RESULT
                     OUTPUT_VARIABLE _PYTHON_IS64BIT
                     ERROR_VARIABLE _PYTHON_IS64BIT)
      if (NOT _PYTHON_RESULT)
        if (_PYTHON_IS64BIT)
          set (_PYTHON_ARCH 64)
          set (_PYTHON_ARCH2 64)
        else()
          set (_PYTHON_ARCH 32)
          set (_PYTHON_ARCH2 32)
        endif()
      endif()
  else()
    # architecture unknown, search for both 64bit and 32bit
    set (_PYTHON_ARCH 64)
    set (_PYTHON_ARCH2 32)
  endif()
endif()

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
      NAMES_PER_DIR
      HINTS ${_Python_LIBRARY_PATH_HINT}
      PATHS
      [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs/Debug
      [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH}\\InstallPath]/libs/Debug
      [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH2}\\InstallPath]/libs/Debug
      [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs/Debug
      [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH}\\InstallPath]/libs/Debug
      [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH2}\\InstallPath]/libs/Debug
      [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
      [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH}\\InstallPath]/libs
      [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH2}\\InstallPath]/libs
      [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
      [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH}\\InstallPath]/libs
      [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH2}\\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}
    NAMES_PER_DIR
    HINTS
      ${_Python_LIBRARY_PATH_HINT}
    PATHS
      ${PYTHON_FRAMEWORK_LIBRARIES}
      [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
      [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH}\\InstallPath]/libs
      [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH2}\\InstallPath]/libs
      [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
      [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH}\\InstallPath]/libs
      [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH2}\\InstallPath]/libs
  )
  # Look for the static library in the Python config directory
  find_library(PYTHON_LIBRARY
    NAMES python${_CURRENT_VERSION_NO_DOTS} python${_CURRENT_VERSION}
    NAMES_PER_DIR
    # This is where the static library is usually located
    PATH_SUFFIXES python${_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)
    # PYTHON_LIBRARY may contain a list because of SelectLibraryConfigurations
    # which may have been run previously. If it is the case, the list can be:
    #   optimized;<FILEPATH_TO_RELEASE_LIBRARY>;debug;<FILEPATH_TO_DEBUG_LIBRARY>
    foreach(lib ${PYTHON_LIBRARY} ${PYTHON_DEBUG_LIBRARY})
      if(IS_ABSOLUTE "${lib}")
        get_filename_component(_Python_PREFIX "${lib}" PATH)
        get_filename_component(_Python_PREFIX "${_Python_PREFIX}" PATH)
        if(_Python_PREFIX)
          list(APPEND _Python_INCLUDE_PATH_HINT ${_Python_PREFIX}/include)
        endif()
        unset(_Python_PREFIX)
      endif()
    endforeach()

    # 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_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH}\\InstallPath]/include
        [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH2}\\InstallPath]/include
        [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/include
        [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH}\\InstallPath]/include
        [HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-${_PYTHON_ARCH2}\\InstallPath]/include
      PATH_SUFFIXES
        python${_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()

cmake_policy(POP)