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dft_tools/cmake/FindPython.cmake
Olivier Parcollet 5105e04ac7 Add new wrapper generator 
- with pytriqs.wrap_test as an example.
2014-05-11 21:47:46 +02:00

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CMake
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# Copyright Olivier Parcollet 2012
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
#
# Python settings :
#
# This module checks that :
# - the python interpreter is working and version >= 2.6.5
# - it has modules : distutils, numpy
#
# This module defines the variables
# - PYTHON_INTERPRETER : name of the python interpreter
# - PYTHON_INCLUDE_DIRS : include for compilation
# - PYTHON_NUMPY_INCLUDE_DIR : include for compilation with numpy
# - PYTHON_LIBRARY : link flags
# - PYTHON_SITE_PKG : path to the standard packages of the python interpreter
# - PYTHON_EXTRA_LIBS : libraries which must be linked in when embedding
# - PYTHON_LINK_FOR_SHARED : linking flags needed when building a shared lib for external modules
set(PYTHON_MINIMAL_VERSION 2.6.5)
MESSAGE( STATUS "-------- Python detection -------------")
# IF PYTHON_INTERPRETER is not defined, try to find a python
if (NOT PYTHON_INTERPRETER )
find_program(PYTHON_INTERPRETER python PATHS $ENV{PATH})
endif (NOT PYTHON_INTERPRETER)
if (NOT PYTHON_INTERPRETER)
MESSAGE(FATAL_ERROR "No python interpreter found")
endif(NOT PYTHON_INTERPRETER)
MESSAGE (STATUS "Python interpreter ${PYTHON_INTERPRETER}")
#
# The function EXEC_PYTHON_SCRIPT executes the_script in python interpreter
# and set the variable of output_var_name in the calling scope
#
FUNCTION ( EXEC_PYTHON_SCRIPT the_script output_var_name)
EXECUTE_PROCESS(COMMAND ${PYTHON_INTERPRETER} -c "${the_script}"
OUTPUT_VARIABLE res RESULT_VARIABLE returncode OUTPUT_STRIP_TRAILING_WHITESPACE)
IF (NOT returncode EQUAL 0)
MESSAGE(FATAL_ERROR "The script : ${the_script} \n did not run properly in the Python interpreter. Check your python installation.")
ENDIF (NOT returncode EQUAL 0)
SET( ${output_var_name} ${res} PARENT_SCOPE)
ENDFUNCTION (EXEC_PYTHON_SCRIPT)
#
# Check the interpreter and its version
#
EXEC_PYTHON_SCRIPT ("import sys, string; print sys.version.split()[0]" PYTHON_VERSION)
STRING(COMPARE GREATER ${PYTHON_MINIMAL_VERSION} ${PYTHON_VERSION} PYTHON_VERSION_NOT_OK)
IF (PYTHON_VERSION_NOT_OK)
MESSAGE(FATAL_ERROR "Python intepreter version is ${PYTHON_VERSION} . It should be >= ${PYTHON_MINIMAL_VERSION}")
ENDIF (PYTHON_VERSION_NOT_OK)
EXEC_PYTHON_SCRIPT ("import mako.template" nulle) # check that Mako is there...
EXEC_PYTHON_SCRIPT ("import distutils " nulle) # check that distutils is there...
EXEC_PYTHON_SCRIPT ("import numpy" nulle) # check that numpy is there...
EXEC_PYTHON_SCRIPT ("import h5py" nulle) # check that h5py is there...
EXEC_PYTHON_SCRIPT ("import scipy" nulle) # check that scipy is there...
MESSAGE(STATUS "Python interpreter and modules are ok : version ${PYTHON_VERSION}" )
#
# Check for Python include path
#
EXEC_PYTHON_SCRIPT ("import distutils ; from distutils.sysconfig import * ; print distutils.sysconfig.get_python_inc()" PYTHON_INCLUDE_DIRS )
message(STATUS "PYTHON_INCLUDE_DIRS = ${PYTHON_INCLUDE_DIRS}" )
mark_as_advanced(PYTHON_INCLUDE_DIRS)
FIND_PATH(TEST_PYTHON_INCLUDE patchlevel.h PATHS ${PYTHON_INCLUDE_DIRS} NO_DEFAULT_PATH)
if (NOT TEST_PYTHON_INCLUDE)
message (ERROR "The Python herader files have not been found. Please check that you installed the Python headers and not only the interpreter.")
endif (NOT TEST_PYTHON_INCLUDE)
mark_as_advanced(TEST_PYTHON_INCLUDE)
#
# include files for numpy
#
EXEC_PYTHON_SCRIPT ("import numpy;print numpy.get_include()" PYTHON_NUMPY_INCLUDE_DIR)
MESSAGE(STATUS "PYTHON_NUMPY_INCLUDE_DIR = ${PYTHON_NUMPY_INCLUDE_DIR}" )
mark_as_advanced(PYTHON_NUMPY_INCLUDE_DIR)
#
# include files for numpy
#
EXEC_PYTHON_SCRIPT ("import numpy;print numpy.version.version" PYTHON_NUMPY_VERSION)
MESSAGE(STATUS "PYTHON_NUMPY_VERSION = ${PYTHON_NUMPY_VERSION}" )
mark_as_advanced(PYTHON_NUMPY_VERSION)
#
# Check for site packages
#
EXEC_PYTHON_SCRIPT ("from distutils.sysconfig import * ;print get_python_lib(0,0)"
PYTHON_SITE_PKG)
MESSAGE(STATUS "PYTHON_SITE_PKG = ${PYTHON_SITE_PKG}" )
mark_as_advanced(PYTHON_SITE_PKG)
#
# Check for Python library path
#
#EXEC_PYTHON_SCRIPT ("import string; from distutils.sysconfig import * ;print string.join(get_config_vars('VERSION'))" PYTHON_VERSION_MAJOR_MINOR)
EXEC_PYTHON_SCRIPT ("import string; from distutils.sysconfig import *; print '%s/config' % get_python_lib(0,1)" PYTHON_LIBRARY_BASE_PATH)
EXEC_PYTHON_SCRIPT ("import string; from distutils.sysconfig import *; print 'libpython%s' % string.join(get_config_vars('VERSION'))" PYTHON_LIBRARY_BASE_FILE)
IF(BUILD_SHARED_LIBS)
FIND_FILE(PYTHON_LIBRARY NAMES "${PYTHON_LIBRARY_BASE_FILE}.so" PATHS ${PYTHON_LIBRARY_BASE_PATH})
IF(NOT PYTHON_LIBRARY)
FIND_FILE(PYTHON_LIBRARY NAMES "${PYTHON_LIBRARY_BASE_FILE}.a" PATHS ${PYTHON_LIBRARY_BASE_PATH})
ENDIF(NOT PYTHON_LIBRARY)
ELSE(BUILD_SHARED_LIBS)
FIND_FILE(PYTHON_LIBRARY NAMES "${PYTHON_LIBRARY_BASE_FILE}.a" PATHS ${PYTHON_LIBRARY_BASE_PATH})
ENDIF(BUILD_SHARED_LIBS)
MESSAGE(STATUS "PYTHON_LIBRARY = ${PYTHON_LIBRARY}" )
mark_as_advanced(PYTHON_LIBRARY)
#
# Cython
#
EXEC_PYTHON_SCRIPT("from Cython.Compiler import Version as V;print V.version.split('.')[1]" PYTHON_CYTHON_VERSION )
MESSAGE(STATUS "Found cython 0.${PYTHON_CYTHON_VERSION}.xxx")
# check version here
#
# libraries which must be linked in when embedding
#
EXEC_PYTHON_SCRIPT ("from distutils.sysconfig import * ;print (str(get_config_var('LOCALMODLIBS')) + ' ' + str(get_config_var('LIBS'))).strip()"
PYTHON_EXTRA_LIBS)
MESSAGE(STATUS "PYTHON_EXTRA_LIBS =${PYTHON_EXTRA_LIBS}" )
mark_as_advanced(PYTHON_EXTRA_LIBS)
#
# Looking for ipython ... (optional)
# not very useful... in static case, we should not allow ipython anyway I guess...
EXECUTE_PROCESS(COMMAND ${PYTHON_INTERPRETER} -c "try :\n import IPython\n print 1\nexcept:\n print 0" OUTPUT_VARIABLE TRIQS_IPYTHON_DETECTED RESULT_VARIABLE returncode OUTPUT_STRIP_TRAILING_WHITESPACE)
if (TRIQS_IPYTHON_DETECTED)
MESSAGE(STATUS "IPython found")
else (TRIQS_IPYTHON_DETECTED)
MESSAGE(STATUS "IPython NOT FOUND ")
endif (TRIQS_IPYTHON_DETECTED)
#
# linking flags needed when embedding (building a shared lib)
# To BE RETESTED
#
#EXEC_PYTHON_SCRIPT ("from distutils.sysconfig import *;print get_config_var('LINKFORSHARED')"
# PYTHON_LINK_FOR_SHARED)
#MESSAGE(STATUS "PYTHON_LINK_FOR_SHARED = ${PYTHON_LINK_FOR_SHARED}" )
#mark_as_advanced(PYTHON_LINK_FOR_SHARED)
# Correction on Mac
#IF(APPLE)
# SET (PYTHON_LINK_FOR_SHARED -u _PyMac_Error -framework Python)
# SET (PYTHON_LINK_MODULE -bundle -undefined dynamic_lookup)
#ELSE(APPLE)
# SET (PYTHON_LINK_MODULE -shared)
#ENDIF(APPLE)
set (PYTHONLIBS_FOUND TRUE) #${PYTHON_FOUND})
# used in BOOST ONLY !!
FUNCTION(PYTHON_ADD_MODULE _NAME )
OPTION(PYTHON_ENABLE_MODULE_${_NAME} "Add module ${_NAME}" TRUE)
OPTION(PYTHON_MODULE_${_NAME}_BUILD_SHARED "Add module ${_NAME} shared" ${BUILD_SHARED_LIBS})
IF(PYTHON_ENABLE_MODULE_${_NAME})
IF(PYTHON_MODULE_${_NAME}_BUILD_SHARED)
SET(PY_MODULE_TYPE MODULE)
ELSE(PYTHON_MODULE_${_NAME}_BUILD_SHARED)
SET(PY_MODULE_TYPE STATIC)
SET_PROPERTY(GLOBAL APPEND PROPERTY PY_STATIC_MODULES_LIST ${_NAME})
ENDIF(PYTHON_MODULE_${_NAME}_BUILD_SHARED)
SET_PROPERTY(GLOBAL APPEND PROPERTY PY_MODULES_LIST ${_NAME})
ADD_LIBRARY(${_NAME} ${PY_MODULE_TYPE} ${ARGN})
# TARGET_LINK_LIBRARIES(${_NAME} ${PYTHON_LIBRARIES})
ENDIF(PYTHON_ENABLE_MODULE_${_NAME})
ENDFUNCTION(PYTHON_ADD_MODULE)
MESSAGE( STATUS "--------------------------------------------")
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