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# (C) Copyright 2011- ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
# In applying this licence, ECMWF does not waive the privileges and immunities
# granted to it by virtue of its status as an intergovernmental organisation nor
# does it submit to any jurisdiction.
##############################################################################
#.rst:
#
# ecbuild_find_python
# ===================
#
# Find Python interpreter, its version and the Python libraries. ::
#
# ecbuild_find_python( [ VERSION <version> ] [ REQUIRED ] [ NO_LIBS ] )
#
# Options
# -------
#
# VERSION : optional
# minimum required version
#
# REQUIRED : optional
# fail if Python was not found
#
# NO_LIBS : optional
# only search for the Python interpreter, not the libraries
#
# Unless ``NO_LIBS`` is set, the ``python-config`` utility, if found, is used
# to determine the Python include directories, libraries and link line. Set the
# CMake variable ``PYTHON_NO_CONFIG`` to use CMake's FindPythonLibs instead.
#
# Output variables
# ----------------
#
# The following CMake variables are set if python was found:
#
# :Python_Interpreter_FOUND: Python interpreter was found
# :Python_Development_FOUND: Python (development) libraries were found
# :Python_FOUND: Python was found (both interpreter and libraries)
# :Python_EXECUTABLE: Python executable
# :Python_VERSION_MAJOR: Major version number
# :Python_VERSION_MINOR: Minor version number
# :Python_VERSION_PATCH: Patch version number
# :Python_VERSION: Python version
# :Python_INCLUDE_DIRS: Python include directories
# :Python_LIBRARIES: Python libraries
# :Python_SITELIB: Python site packages directory
#
# The following variables with prefix ``PYTHON_`` are now *DEPRECATED* and
# will be removed in a future version; these variables are still set for
# backwards compatibility. The new variables with prefix ``Python_``
# should be used instead.
#
# :PYTHONINTERP_FOUND: Python interpreter was found
# :PYTHONLIBS_FOUND: Python libraries were found
# :PYTHON_FOUND: Python was found (both interpreter and libraries)
# :PYTHON_EXECUTABLE: Python executable
# :PYTHON_VERSION_MAJOR: major version number
# :PYTHON_VERSION_MINOR: minor version number
# :PYTHON_VERSION_PATCH: patch version number
# :PYTHON_VERSION_STRING: Python version
# :PYTHON_INCLUDE_DIRS: Python include directories
# :PYTHON_LIBRARIES: Python libraries
# :PYTHON_SITE_PACKAGES: Python site packages directory
#
##############################################################################
set( __test_python ${CMAKE_CURRENT_LIST_DIR}/pymain.c )
function( ecbuild_find_python )
# parse parameters
set( options REQUIRED NO_LIBS )
set( single_value_args VERSION )
set( multi_value_args )
cmake_parse_arguments( _p "${options}" "${single_value_args}" "${multi_value_args}" ${_FIRST_ARG} ${ARGN} )
if(_p_UNPARSED_ARGUMENTS)
ecbuild_critical("Unknown keywords given to ecbuild_find_python(): \"${_p_UNPARSED_ARGUMENTS}\"")
endif()
if( _p_REQUIRED )
ecbuild_debug( "ecbuild_find_python: Searching for Python interpreter (required) ..." )
set( _p_REQUIRED REQUIRED )
else()
ecbuild_debug( "ecbuild_find_python: Searching for Python interpreter ..." )
unset( _p_REQUIRED )
endif()
# find python interpreter/executable
# Search first without specifying the version, since doing so gives preference to the specified
# version even though a never version of the interpreter may be available
if ( _p_NO_LIBS )
find_package( Python ${_p_VERSION} COMPONENTS Interpreter ${_p_REQUIRED} )
set( __required_vars Python_FOUND Python_Interpreter_FOUND )
else()
find_package( Python ${_p_VERSION} COMPONENTS Interpreter Development ${_p_REQUIRED} )
set( __required_vars Python_FOUND Python_Interpreter_FOUND Python_Development_FOUND )
endif()
if( Python_Interpreter_FOUND )
ecbuild_debug( "ecbuild_find_python: Found Python interpreter version '${Python_VERSION}' at '${Python_EXECUTABLE}'" )
# python site-packages are located at...
ecbuild_debug( "ecbuild_find_python: Python_SITELIB=${Python_SITELIB}" )
else()
ecbuild_debug( "ecbuild_find_python: could NOT find Python interpreter!" )
endif()
find_package_handle_standard_args( Python DEFAULT_MSG ${__required_vars} )
set( Python_FOUND ${Python_FOUND} PARENT_SCOPE )
set( Python_Interpreter_FOUND ${Python_Interpreter_FOUND} PARENT_SCOPE )
set( Python_Development_FOUND ${Python_Development_FOUND} PARENT_SCOPE )
set( Python_EXECUTABLE ${Python_EXECUTABLE} PARENT_SCOPE )
set( Python_VERSION_MAJOR ${Python_VERSION_MAJOR} PARENT_SCOPE )
set( Python_VERSION_MINOR ${Python_VERSION_MINOR} PARENT_SCOPE )
set( Python_VERSION_PATCH ${Python_VERSION_PATCH} PARENT_SCOPE )
set( Python_VERSION ${Python_VERSION} PARENT_SCOPE )
set( Python_INCLUDE_DIRS ${Python_INCLUDE_DIRS} PARENT_SCOPE )
set( Python_LIBRARIES ${Python_LIBRARIES} PARENT_SCOPE )
set( Python_SITELIB ${Python_SITELIB} PARENT_SCOPE )
# To keep backwards compatibility, the old variable names (PYTHON_*) are set as well
set( PYTHON_FOUND "${Python_FOUND}" PARENT_SCOPE )
set( PYTHONINTERP_FOUND "${Python_Interpreter_FOUND}" PARENT_SCOPE )
set( PYTHONLIBS_FOUND "${Python_Development_FOUND}" PARENT_SCOPE )
set( PYTHON_EXECUTABLE "${Python_EXECUTABLE}" PARENT_SCOPE )
set( PYTHON_VERSION_MAJOR "${Python_VERSION_MAJOR}" PARENT_SCOPE )
set( PYTHON_VERSION_MINOR "${Python_VERSION_MINOR}" PARENT_SCOPE )
set( PYTHON_VERSION_PATCH "${Python_VERSION_PATCH}" PARENT_SCOPE )
set( PYTHON_VERSION_STRING "${Python_VERSION}" PARENT_SCOPE )
set( PYTHON_INCLUDE_DIRS "${Python_INCLUDE_DIRS}" PARENT_SCOPE )
set( PYTHON_LIBRARIES "${Python_LIBRARIES}" PARENT_SCOPE )
set( PYTHON_SITE_PACKAGES "${Python_SITELIB}" PARENT_SCOPE )
endfunction( ecbuild_find_python )
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