lldb/cmake/modules/FindPythonInterpAndLibs.cmake

#.rst:
# FindPythonInterpAndLibs
# -----------
#
# Find the python interpreter and libraries as a whole.

macro(FindPython3)
  # Use PYTHON_HOME as a hint to find Python 3.
  set(Python3_ROOT_DIR "${PYTHON_HOME}")
  find_package(Python3 COMPONENTS Interpreter Development)
  if(Python3_FOUND AND Python3_Interpreter_FOUND)
    set(PYTHON_LIBRARIES ${Python3_LIBRARIES})
    set(PYTHON_INCLUDE_DIRS ${Python3_INCLUDE_DIRS})
    set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE})

    # The install name for the Python 3 framework in Xcode is relative to
    # the framework's location and not the dylib itself.
    #
    #   @rpath/Python3.framework/Versions/3.x/Python3
    #
    # This means that we need to compute the path to the Python3.framework
    # and use that as the RPATH instead of the usual dylib's directory.
    #
    # The check below shouldn't match Homebrew's Python framework as it is
    # called Python.framework instead of Python3.framework.
    if (APPLE AND Python3_LIBRARIES MATCHES "Python3.framework")
      string(FIND "${Python3_LIBRARIES}" "Python3.framework" python_framework_pos)
      string(SUBSTRING "${Python3_LIBRARIES}" "0" ${python_framework_pos} PYTHON_RPATH)
    endif()

    set(PYTHON3_FOUND TRUE)
    mark_as_advanced(
      PYTHON_LIBRARIES
      PYTHON_INCLUDE_DIRS
      PYTHON_EXECUTABLE
      PYTHON_RPATH
      SWIG_EXECUTABLE)
  endif()
endmacro()

macro(FindPython2)
  # Use PYTHON_HOME as a hint to find Python 2.
  set(Python2_ROOT_DIR "${PYTHON_HOME}")
  find_package(Python2 COMPONENTS Interpreter Development)
  if(Python2_FOUND AND Python2_Interpreter_FOUND)
    set(PYTHON_LIBRARIES ${Python2_LIBRARIES})
    set(PYTHON_INCLUDE_DIRS ${Python2_INCLUDE_DIRS})
    set(PYTHON_EXECUTABLE ${Python2_EXECUTABLE})

    set(PYTHON2_FOUND TRUE)
    mark_as_advanced(
      PYTHON_LIBRARIES
      PYTHON_INCLUDE_DIRS
      PYTHON_EXECUTABLE
      SWIG_EXECUTABLE)
  endif()
endmacro()

if(PYTHON_LIBRARIES AND PYTHON_INCLUDE_DIRS AND PYTHON_EXECUTABLE AND SWIG_EXECUTABLE)
  set(PYTHONINTERPANDLIBS_FOUND TRUE)
else()
  find_package(SWIG 2.0)
  if (SWIG_FOUND)
    if(NOT CMAKE_VERSION VERSION_LESS 3.12)
      if (LLDB_PYTHON_VERSION)
        if (LLDB_PYTHON_VERSION VERSION_EQUAL "2")
          FindPython2()
        elseif(LLDB_PYTHON_VERSION VERSION_EQUAL "3")
          FindPython3()
        endif()
      else()
        FindPython3()
        if (NOT PYTHON3_FOUND AND NOT CMAKE_SYSTEM_NAME STREQUAL Windows)
          FindPython2()
        endif()
      endif()
    else()
      find_package(PythonInterp)
      find_package(PythonLibs)
      if(PYTHONINTERP_FOUND AND PYTHONLIBS_FOUND AND SWIG_FOUND)
        if (NOT CMAKE_CROSSCOMPILING)
          string(REPLACE "." ";" pythonlibs_version_list ${PYTHONLIBS_VERSION_STRING})
          list(GET pythonlibs_version_list 0 pythonlibs_major)
          list(GET pythonlibs_version_list 1 pythonlibs_minor)

          # Ignore the patch version. Some versions of macOS report a different
          # patch version for the system provided interpreter and libraries.
          if (CMAKE_CROSSCOMPILING OR (PYTHON_VERSION_MAJOR VERSION_EQUAL pythonlibs_major AND
              PYTHON_VERSION_MINOR VERSION_EQUAL pythonlibs_minor))
            mark_as_advanced(
              PYTHON_LIBRARIES
              PYTHON_INCLUDE_DIRS
              PYTHON_EXECUTABLE
              SWIG_EXECUTABLE)
          endif()
        endif()
      endif()
    endif()
  else()
    message(STATUS "SWIG 2 or later is required for Python support in LLDB but could not be found")
  endif()


  include(FindPackageHandleStandardArgs)
  find_package_handle_standard_args(PythonInterpAndLibs
                                    FOUND_VAR
                                      PYTHONINTERPANDLIBS_FOUND
                                    REQUIRED_VARS
                                      PYTHON_LIBRARIES
                                      PYTHON_INCLUDE_DIRS
                                      PYTHON_EXECUTABLE
                                      SWIG_EXECUTABLE)
endif()