m4/python.m4 - automake - Git at Google

 ## ------------------------                                 -*- Autoconf -*-
 ## Python file handling
 ## From Andrew Dalke
 ## Updated by James Henstridge
 ## ------------------------
 # Copyright (C) 1999-2018 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.


 # AM_PATH_PYTHON([MINIMUM-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
 # ---------------------------------------------------------------------------
 # Adds support for distributing Python modules and packages.  To
 # install modules, copy them to $(pythondir), using the python_PYTHON
 # automake variable.  To install a package with the same name as the
 # automake package, install to $(pkgpythondir), or use the
 # pkgpython_PYTHON automake variable.
 #
 # The variables $(pyexecdir) and $(pkgpyexecdir) are provided as
 # locations to install python extension modules (shared libraries).
 # Another macro is required to find the appropriate flags to compile
 # extension modules.
 #
 # If your package is configured with a different prefix to python,
 # users will have to add the install directory to the PYTHONPATH
 # environment variable, or create a .pth file (see the python
 # documentation for details).
 #
 # If the MINIMUM-VERSION argument is passed, AM_PATH_PYTHON will
 # cause an error if the version of python installed on the system
 # doesn't meet the requirement.  MINIMUM-VERSION should consist of
 # numbers and dots only.
 AC_DEFUN([AM_PATH_PYTHON],
  [
   dnl Find a Python interpreter.  Python versions prior to 2.0 are not
   dnl supported. (2.0 was released on October 16, 2000).
   m4_define_default([_AM_PYTHON_INTERPRETER_LIST],
 [python python2 python3 dnl
  python3.9 python3.8 python3.7 python3.6 python3.5 python3.4 python3.3 dnl
  python3.2 python3.1 python3.0 dnl
  python2.7 python2.6 python2.5 python2.4 python2.3 python2.2 python2.1 dnl
  python2.0])

   AC_ARG_VAR([PYTHON], [the Python interpreter])

   m4_if([$1],[],[
     dnl No version check is needed.
     # Find any Python interpreter.
     if test -z "$PYTHON"; then
       AC_PATH_PROGS([PYTHON], _AM_PYTHON_INTERPRETER_LIST, :)
     fi
     am_display_PYTHON=python
   ], [
     dnl A version check is needed.
     if test -n "$PYTHON"; then
       # If the user set $PYTHON, use it and don't search something else.
       AC_MSG_CHECKING([whether $PYTHON version is >= $1])
       AM_PYTHON_CHECK_VERSION([$PYTHON], [$1],
 			      [AC_MSG_RESULT([yes])],
 			      [AC_MSG_RESULT([no])
 			       AC_MSG_ERROR([Python interpreter is too old])])
       am_display_PYTHON=$PYTHON
     else
       # Otherwise, try each interpreter until we find one that satisfies
       # VERSION.
       AC_CACHE_CHECK([for a Python interpreter with version >= $1],
 	[am_cv_pathless_PYTHON],[
 	for am_cv_pathless_PYTHON in _AM_PYTHON_INTERPRETER_LIST none; do
 	  test "$am_cv_pathless_PYTHON" = none && break
 	  AM_PYTHON_CHECK_VERSION([$am_cv_pathless_PYTHON], [$1], [break])
 	done])
       # Set $PYTHON to the absolute path of $am_cv_pathless_PYTHON.
       if test "$am_cv_pathless_PYTHON" = none; then
 	PYTHON=:
       else
         AC_PATH_PROG([PYTHON], [$am_cv_pathless_PYTHON])
       fi
       am_display_PYTHON=$am_cv_pathless_PYTHON
     fi
   ])

   if test "$PYTHON" = :; then
   dnl Run any user-specified action, or abort.
     m4_default([$3], [AC_MSG_ERROR([no suitable Python interpreter found])])
   else

   dnl Query Python for its version number.  Getting [:3] seems to be
   dnl the best way to do this; it's what "site.py" does in the standard
   dnl library.

   AC_CACHE_CHECK([for $am_display_PYTHON version], [am_cv_python_version],
     [am_cv_python_version=`$PYTHON -c "import sys; sys.stdout.write(sys.version[[:3]])"`])
   AC_SUBST([PYTHON_VERSION], [$am_cv_python_version])

   dnl Use the values of $prefix and $exec_prefix for the corresponding
   dnl values of PYTHON_PREFIX and PYTHON_EXEC_PREFIX.  These are made
   dnl distinct variables so they can be overridden if need be.  However,
   dnl general consensus is that you shouldn't need this ability.

   AC_SUBST([PYTHON_PREFIX], ['${prefix}'])
   AC_SUBST([PYTHON_EXEC_PREFIX], ['${exec_prefix}'])

   dnl At times (like when building shared libraries) you may want
   dnl to know which OS platform Python thinks this is.

   AC_CACHE_CHECK([for $am_display_PYTHON platform], [am_cv_python_platform],
     [am_cv_python_platform=`$PYTHON -c "import sys; sys.stdout.write(sys.platform)"`])
   AC_SUBST([PYTHON_PLATFORM], [$am_cv_python_platform])

   # Just factor out some code duplication.
   am_python_setup_sysconfig="\
 import sys
 # Prefer sysconfig over distutils.sysconfig, for better compatibility
 # with python 3.x.  See automake bug#10227.
 try:
     import sysconfig
 except ImportError:
     can_use_sysconfig = 0
 else:
     can_use_sysconfig = 1
 # Can't use sysconfig in CPython 2.7, since it's broken in virtualenvs:
 # <https://github.com/pypa/virtualenv/issues/118>
 try:
     from platform import python_implementation
     if python_implementation() == 'CPython' and sys.version[[:3]] == '2.7':
         can_use_sysconfig = 0
 except ImportError:
     pass"

   dnl Set up 4 directories:

   dnl pythondir -- where to install python scripts.  This is the
   dnl   site-packages directory, not the python standard library
   dnl   directory like in previous automake betas.  This behavior
   dnl   is more consistent with lispdir.m4 for example.
   dnl Query distutils for this directory.
   AC_CACHE_CHECK([for $am_display_PYTHON script directory],
     [am_cv_python_pythondir],
     [if test "x$prefix" = xNONE
      then
        am_py_prefix=$ac_default_prefix
      else
        am_py_prefix=$prefix
      fi
      am_cv_python_pythondir=`$PYTHON -c "
 $am_python_setup_sysconfig
 if can_use_sysconfig:
     sitedir = sysconfig.get_path('purelib', vars={'base':'$am_py_prefix'})
 else:
     from distutils import sysconfig
     sitedir = sysconfig.get_python_lib(0, 0, prefix='$am_py_prefix')
 sys.stdout.write(sitedir)"`
      case $am_cv_python_pythondir in
      $am_py_prefix*)
        am__strip_prefix=`echo "$am_py_prefix" | sed 's|.|.|g'`
        am_cv_python_pythondir=`echo "$am_cv_python_pythondir" | sed "s,^$am__strip_prefix,$PYTHON_PREFIX,"`
        ;;
      *)
        case $am_py_prefix in
          /usr|/System*) ;;
          *)
 	  am_cv_python_pythondir=$PYTHON_PREFIX/lib/python$PYTHON_VERSION/site-packages
 	  ;;
        esac
        ;;
      esac
     ])
   AC_SUBST([pythondir], [$am_cv_python_pythondir])

   dnl pkgpythondir -- $PACKAGE directory under pythondir.  Was
   dnl   PYTHON_SITE_PACKAGE in previous betas, but this naming is
   dnl   more consistent with the rest of automake.

   AC_SUBST([pkgpythondir], [\${pythondir}/$PACKAGE])

   dnl pyexecdir -- directory for installing python extension modules
   dnl   (shared libraries)
   dnl Query distutils for this directory.
   AC_CACHE_CHECK([for $am_display_PYTHON extension module directory],
     [am_cv_python_pyexecdir],
     [if test "x$exec_prefix" = xNONE
      then
        am_py_exec_prefix=$am_py_prefix
      else
        am_py_exec_prefix=$exec_prefix
      fi
      am_cv_python_pyexecdir=`$PYTHON -c "
 $am_python_setup_sysconfig
 if can_use_sysconfig:
     sitedir = sysconfig.get_path('platlib', vars={'platbase':'$am_py_prefix'})
 else:
     from distutils import sysconfig
     sitedir = sysconfig.get_python_lib(1, 0, prefix='$am_py_prefix')
 sys.stdout.write(sitedir)"`
      case $am_cv_python_pyexecdir in
      $am_py_exec_prefix*)
        am__strip_prefix=`echo "$am_py_exec_prefix" | sed 's|.|.|g'`
        am_cv_python_pyexecdir=`echo "$am_cv_python_pyexecdir" | sed "s,^$am__strip_prefix,$PYTHON_EXEC_PREFIX,"`
        ;;
      *)
        case $am_py_exec_prefix in
          /usr|/System*) ;;
          *)
 	   am_cv_python_pyexecdir=$PYTHON_EXEC_PREFIX/lib/python$PYTHON_VERSION/site-packages
 	   ;;
        esac
        ;;
      esac
     ])
   AC_SUBST([pyexecdir], [$am_cv_python_pyexecdir])

   dnl pkgpyexecdir -- $(pyexecdir)/$(PACKAGE)

   AC_SUBST([pkgpyexecdir], [\${pyexecdir}/$PACKAGE])

   dnl Run any user-specified action.
   $2
   fi

 ])


 # AM_PYTHON_CHECK_VERSION(PROG, VERSION, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
 # ---------------------------------------------------------------------------
 # Run ACTION-IF-TRUE if the Python interpreter PROG has version >= VERSION.
 # Run ACTION-IF-FALSE otherwise.
 # This test uses sys.hexversion instead of the string equivalent (first
 # word of sys.version), in order to cope with versions such as 2.2c1.
 # This supports Python 2.0 or higher. (2.0 was released on October 16, 2000).
 AC_DEFUN([AM_PYTHON_CHECK_VERSION],
  [prog="import sys
 # split strings by '.' and convert to numeric.  Append some zeros
 # because we need at least 4 digits for the hex conversion.
 # map returns an iterator in Python 3.0 and a list in 2.x
 minver = list(map(int, '$2'.split('.'))) + [[0, 0, 0]]
 minverhex = 0
 # xrange is not present in Python 3.0 and range returns an iterator
 for i in list(range(0, 4)): minverhex = (minverhex << 8) + minver[[i]]
 sys.exit(sys.hexversion < minverhex)"
   AS_IF([AM_RUN_LOG([$1 -c "$prog"])], [$3], [$4])])
	## ------------------------ -- Autoconf --
	## Python file handling
	## From Andrew Dalke
	## Updated by James Henstridge
	## ------------------------
	# Copyright (C) 1999-2018 Free Software Foundation, Inc.
	#
	# This file is free software; the Free Software Foundation
	# gives unlimited permission to copy and/or distribute it,
	# with or without modifications, as long as this notice is preserved.


	# AM_PATH_PYTHON([MINIMUM-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
	# ---------------------------------------------------------------------------
	# Adds support for distributing Python modules and packages. To
	# install modules, copy them to $(pythondir), using the python_PYTHON
	# automake variable. To install a package with the same name as the
	# automake package, install to $(pkgpythondir), or use the
	# pkgpython_PYTHON automake variable.
	#
	# The variables $(pyexecdir) and $(pkgpyexecdir) are provided as
	# locations to install python extension modules (shared libraries).
	# Another macro is required to find the appropriate flags to compile
	# extension modules.
	#
	# If your package is configured with a different prefix to python,
	# users will have to add the install directory to the PYTHONPATH
	# environment variable, or create a .pth file (see the python
	# documentation for details).
	#
	# If the MINIMUM-VERSION argument is passed, AM_PATH_PYTHON will
	# cause an error if the version of python installed on the system
	# doesn't meet the requirement. MINIMUM-VERSION should consist of
	# numbers and dots only.
	AC_DEFUN([AM_PATH_PYTHON],
	[
	dnl Find a Python interpreter. Python versions prior to 2.0 are not
	dnl supported. (2.0 was released on October 16, 2000).
	m4_define_default([_AM_PYTHON_INTERPRETER_LIST],
	[python python2 python3 dnl
	python3.9 python3.8 python3.7 python3.6 python3.5 python3.4 python3.3 dnl
	python3.2 python3.1 python3.0 dnl
	python2.7 python2.6 python2.5 python2.4 python2.3 python2.2 python2.1 dnl
	python2.0])

	AC_ARG_VAR([PYTHON], [the Python interpreter])

	m4_if([$1],[],[
	dnl No version check is needed.
	# Find any Python interpreter.
	if test -z "$PYTHON"; then
	AC_PATH_PROGS([PYTHON], _AM_PYTHON_INTERPRETER_LIST, :)
	fi
	am_display_PYTHON=python
	], [
	dnl A version check is needed.
	if test -n "$PYTHON"; then
	# If the user set $PYTHON, use it and don't search something else.
	AC_MSG_CHECKING([whether $PYTHON version is >= $1])
	AM_PYTHON_CHECK_VERSION([$PYTHON], [$1],
	[AC_MSG_RESULT([yes])],
	[AC_MSG_RESULT([no])
	AC_MSG_ERROR([Python interpreter is too old])])
	am_display_PYTHON=$PYTHON
	else
	# Otherwise, try each interpreter until we find one that satisfies
	# VERSION.
	AC_CACHE_CHECK([for a Python interpreter with version >= $1],
	[am_cv_pathless_PYTHON],[
	for am_cv_pathless_PYTHON in _AM_PYTHON_INTERPRETER_LIST none; do
	test "$am_cv_pathless_PYTHON" = none && break
	AM_PYTHON_CHECK_VERSION([$am_cv_pathless_PYTHON], [$1], [break])
	done])
	# Set $PYTHON to the absolute path of $am_cv_pathless_PYTHON.
	if test "$am_cv_pathless_PYTHON" = none; then
	PYTHON=:
	else
	AC_PATH_PROG([PYTHON], [$am_cv_pathless_PYTHON])
	fi
	am_display_PYTHON=$am_cv_pathless_PYTHON
	fi
	])

	if test "$PYTHON" = :; then
	dnl Run any user-specified action, or abort.
	m4_default([$3], [AC_MSG_ERROR([no suitable Python interpreter found])])
	else

	dnl Query Python for its version number. Getting [:3] seems to be
	dnl the best way to do this; it's what "site.py" does in the standard
	dnl library.

	AC_CACHE_CHECK([for $am_display_PYTHON version], [am_cv_python_version],
	[am_cv_python_version=`$PYTHON -c "import sys; sys.stdout.write(sys.version[[:3]])"`])
	AC_SUBST([PYTHON_VERSION], [$am_cv_python_version])

	dnl Use the values of $prefix and $exec_prefix for the corresponding
	dnl values of PYTHON_PREFIX and PYTHON_EXEC_PREFIX. These are made
	dnl distinct variables so they can be overridden if need be. However,
	dnl general consensus is that you shouldn't need this ability.

	AC_SUBST([PYTHON_PREFIX], ['${prefix}'])
	AC_SUBST([PYTHON_EXEC_PREFIX], ['${exec_prefix}'])

	dnl At times (like when building shared libraries) you may want
	dnl to know which OS platform Python thinks this is.

	AC_CACHE_CHECK([for $am_display_PYTHON platform], [am_cv_python_platform],
	[am_cv_python_platform=`$PYTHON -c "import sys; sys.stdout.write(sys.platform)"`])
	AC_SUBST([PYTHON_PLATFORM], [$am_cv_python_platform])

	# Just factor out some code duplication.
	am_python_setup_sysconfig="\
	import sys
	# Prefer sysconfig over distutils.sysconfig, for better compatibility
	# with python 3.x. See automake bug#10227.
	try:
	import sysconfig
	except ImportError:
	can_use_sysconfig = 0
	else:
	can_use_sysconfig = 1
	# Can't use sysconfig in CPython 2.7, since it's broken in virtualenvs:
	# <https://github.com/pypa/virtualenv/issues/118>
	try:
	from platform import python_implementation
	if python_implementation() == 'CPython' and sys.version[[:3]] == '2.7':
	can_use_sysconfig = 0
	except ImportError:
	pass"

	dnl Set up 4 directories:

	dnl pythondir -- where to install python scripts. This is the
	dnl site-packages directory, not the python standard library
	dnl directory like in previous automake betas. This behavior
	dnl is more consistent with lispdir.m4 for example.
	dnl Query distutils for this directory.
	AC_CACHE_CHECK([for $am_display_PYTHON script directory],
	[am_cv_python_pythondir],
	[if test "x$prefix" = xNONE
	then
	am_py_prefix=$ac_default_prefix
	else
	am_py_prefix=$prefix
	fi
	am_cv_python_pythondir=`$PYTHON -c "
	$am_python_setup_sysconfig
	if can_use_sysconfig:
	sitedir = sysconfig.get_path('purelib', vars={'base':'$am_py_prefix'})
	else:
	from distutils import sysconfig
	sitedir = sysconfig.get_python_lib(0, 0, prefix='$am_py_prefix')
	sys.stdout.write(sitedir)"`
	case $am_cv_python_pythondir in
	$am_py_prefix*)
	am__strip_prefix=`echo "$am_py_prefix" \| sed 's\|.\|.\|g'`
	am_cv_python_pythondir=`echo "$am_cv_python_pythondir" \| sed "s,^$am__strip_prefix,$PYTHON_PREFIX,"`
	;;
	*)
	case $am_py_prefix in
	/usr\|/System*) ;;
	*)
	am_cv_python_pythondir=$PYTHON_PREFIX/lib/python$PYTHON_VERSION/site-packages
	;;
	esac
	;;
	esac
	])
	AC_SUBST([pythondir], [$am_cv_python_pythondir])

	dnl pkgpythondir -- $PACKAGE directory under pythondir. Was
	dnl PYTHON_SITE_PACKAGE in previous betas, but this naming is
	dnl more consistent with the rest of automake.

	AC_SUBST([pkgpythondir], [\${pythondir}/$PACKAGE])

	dnl pyexecdir -- directory for installing python extension modules
	dnl (shared libraries)
	dnl Query distutils for this directory.
	AC_CACHE_CHECK([for $am_display_PYTHON extension module directory],
	[am_cv_python_pyexecdir],
	[if test "x$exec_prefix" = xNONE
	then
	am_py_exec_prefix=$am_py_prefix
	else
	am_py_exec_prefix=$exec_prefix
	fi
	am_cv_python_pyexecdir=`$PYTHON -c "
	$am_python_setup_sysconfig
	if can_use_sysconfig:
	sitedir = sysconfig.get_path('platlib', vars={'platbase':'$am_py_prefix'})
	else:
	from distutils import sysconfig
	sitedir = sysconfig.get_python_lib(1, 0, prefix='$am_py_prefix')
	sys.stdout.write(sitedir)"`
	case $am_cv_python_pyexecdir in
	$am_py_exec_prefix*)
	am__strip_prefix=`echo "$am_py_exec_prefix" \| sed 's\|.\|.\|g'`
	am_cv_python_pyexecdir=`echo "$am_cv_python_pyexecdir" \| sed "s,^$am__strip_prefix,$PYTHON_EXEC_PREFIX,"`
	;;
	*)
	case $am_py_exec_prefix in
	/usr\|/System*) ;;
	*)
	am_cv_python_pyexecdir=$PYTHON_EXEC_PREFIX/lib/python$PYTHON_VERSION/site-packages
	;;
	esac
	;;
	esac
	])
	AC_SUBST([pyexecdir], [$am_cv_python_pyexecdir])

	dnl pkgpyexecdir -- $(pyexecdir)/$(PACKAGE)

	AC_SUBST([pkgpyexecdir], [\${pyexecdir}/$PACKAGE])

	dnl Run any user-specified action.
	$2
	fi

	])


	# AM_PYTHON_CHECK_VERSION(PROG, VERSION, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
	# ---------------------------------------------------------------------------
	# Run ACTION-IF-TRUE if the Python interpreter PROG has version >= VERSION.
	# Run ACTION-IF-FALSE otherwise.
	# This test uses sys.hexversion instead of the string equivalent (first
	# word of sys.version), in order to cope with versions such as 2.2c1.
	# This supports Python 2.0 or higher. (2.0 was released on October 16, 2000).
	AC_DEFUN([AM_PYTHON_CHECK_VERSION],
	[prog="import sys
	# split strings by '.' and convert to numeric. Append some zeros
	# because we need at least 4 digits for the hex conversion.
	# map returns an iterator in Python 3.0 and a list in 2.x
	minver = list(map(int, '$2'.split('.'))) + [[0, 0, 0]]
	minverhex = 0
	# xrange is not present in Python 3.0 and range returns an iterator
	for i in list(range(0, 4)): minverhex = (minverhex << 8) + minver[[i]]
	sys.exit(sys.hexversion < minverhex)"
	AS_IF([AM_RUN_LOG([$1 -c "$prog"])], [$3], [$4])])