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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: ac_python_devel
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<hr>
<h1>
ac_python_devel
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_PYTHON_DEVEL([version])</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Note: Defines as a precious variable "PYTHON_VERSION". Don't override it in
your configure.ac.
</p>
<p>
This macro checks for Python and tries to get the include path to
'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LDFLAGS) output
variables. It also exports $(PYTHON_EXTRA_LIBS) and $(PYTHON_EXTRA_LDFLAGS)
for embedding Python in your code.
</p>
<p>
You can search for some particular version of Python by passing a parameter
to this macro, for example ">= '2.3.1'", or "== '2.4'". Please note that
you *have* to pass also an operator along with the version to match, and
pay special attention to the single quotes surrounding the version number.
Don't use "PYTHON_VERSION" for this: that environment variable is declared
as precious and thus reserved for the end-user.
</p>
<p>
This macro should work for all versions of Python >= 2.1.0. As an end
user, you can disable the check for the python version by setting the
PYTHON_NOVERSIONCHECK environment variable to something else than the empty
string.
</p>
<p>
If you need to use this macro for an older Python version, please contact
the authors. We're always open for feedback.
</p>
</div>
<h2>
Authors
</h2>
<p class="indent">
Sebastian Huber <sebastian-huber@web.de>, Alan W. Irwin
<irwin@beluga.phys.uvic.ca>, Rafael Laboissiere
<rafael@laboissiere.net>, Andrew Collier <colliera@ukzn.ac.za>,
Matteo Settenvini <matteo@member.fsf.org>, and Horst Knorr
<hk_classes@knoda.org>.
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2006-10-22
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_PYTHON_DEVEL],[
#
# Allow the use of a (user set) custom python version
#
AC_ARG_VAR([PYTHON_VERSION],[The installed Python
version to use, for example '2.3'. This string
will be appended to the Python interpreter
canonical name.])
AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
if test -z "$PYTHON"; then
AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
PYTHON_VERSION=""
fi
#
# Check for a version of Python >= 2.1.0
#
AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
ac_supports_python_ver=`$PYTHON -c "import sys, string; \
ver = string.split(sys.version)[[0]]; \
print ver >= '2.1.0'"`
if test "$ac_supports_python_ver" != "True"; then
if test -z "$PYTHON_NOVERSIONCHECK"; then
AC_MSG_RESULT([no])
AC_MSG_FAILURE([
This version of the AC@&t@_PYTHON_DEVEL macro
doesn't work properly with versions of Python before
2.1.0. You may need to re-run configure, setting the
variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
to something else than an empty string.
])
else
AC_MSG_RESULT([skip at user request])
fi
else
AC_MSG_RESULT([yes])
fi
#
# if the macro parameter ``version'' is set, honour it
#
if test -n "$1"; then
AC_MSG_CHECKING([for a version of Python $1])
ac_supports_python_ver=`$PYTHON -c "import sys, string; \
ver = string.split(sys.version)[[0]]; \
print ver $1"`
if test "$ac_supports_python_ver" = "True"; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
AC_MSG_ERROR([this package requires Python $1.
If you have it installed, but it isn't the default Python
interpreter in your system path, please pass the PYTHON_VERSION
variable to configure. See ``configure --help'' for reference.
])
PYTHON_VERSION=""
fi
fi
#
# Check if you have distutils, else fail
#
AC_MSG_CHECKING([for the distutils Python package])
ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
if test -z "$ac_distutils_result"; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
AC_MSG_ERROR([cannot import Python module "distutils".
Please check your Python installation. The error was:
$ac_distutils_result])
PYTHON_VERSION=""
fi
#
# Check for Python include path
#
AC_MSG_CHECKING([for Python include path])
if test -z "$PYTHON_CPPFLAGS"; then
python_path=`$PYTHON -c "import distutils.sysconfig; \
print distutils.sysconfig.get_python_inc();"`
if test -n "${python_path}"; then
python_path="-I$python_path"
fi
PYTHON_CPPFLAGS=$python_path
fi
AC_MSG_RESULT([$PYTHON_CPPFLAGS])
AC_SUBST([PYTHON_CPPFLAGS])
#
# Check for Python library path
#
AC_MSG_CHECKING([for Python library path])
if test -z "$PYTHON_LDFLAGS"; then
# (makes two attempts to ensure we've got a version number
# from the interpreter)
py_version=`$PYTHON -c "from distutils.sysconfig import *; \
from string import join; \
print join(get_config_vars('VERSION'))"`
if test "$py_version" == "[None]"; then
if test -n "$PYTHON_VERSION"; then
py_version=$PYTHON_VERSION
else
py_version=`$PYTHON -c "import sys; \
print sys.version[[:3]]"`
fi
fi
PYTHON_LDFLAGS=`$PYTHON -c "from distutils.sysconfig import *; \
from string import join; \
print '-L' + get_python_lib(0,1), \
'-lpython';"`$py_version
fi
AC_MSG_RESULT([$PYTHON_LDFLAGS])
AC_SUBST([PYTHON_LDFLAGS])
#
# Check for site packages
#
AC_MSG_CHECKING([for Python site-packages path])
if test -z "$PYTHON_SITE_PKG"; then
PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
print distutils.sysconfig.get_python_lib(0,0);"`
fi
AC_MSG_RESULT([$PYTHON_SITE_PKG])
AC_SUBST([PYTHON_SITE_PKG])
#
# libraries which must be linked in when embedding
#
AC_MSG_CHECKING(python extra libraries)
if test -z "$PYTHON_EXTRA_LIBS"; then
PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
conf = distutils.sysconfig.get_config_var; \
print conf('LOCALMODLIBS'), conf('LIBS')"`
fi
AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
AC_SUBST(PYTHON_EXTRA_LIBS)
#
# linking flags needed when embedding
#
AC_MSG_CHECKING(python extra linking flags)
if test -z "$PYTHON_EXTRA_LDFLAGS"; then
PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
conf = distutils.sysconfig.get_config_var; \
print conf('LINKFORSHARED')"`
fi
AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
AC_SUBST(PYTHON_EXTRA_LDFLAGS)
#
# final check to see if everything compiles alright
#
AC_MSG_CHECKING([consistency of all components of python development environment])
AC_LANG_PUSH([C])
# save current global flags
LIBS="$ac_save_LIBS $PYTHON_LDFLAGS"
CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
AC_TRY_LINK([
#include <Python.h>
],[
Py_Initialize();
],[pythonexists=yes],[pythonexists=no])
AC_MSG_RESULT([$pythonexists])
if test ! "$pythonexists" = "yes"; then
AC_MSG_ERROR([
Could not link test program to Python. Maybe the main Python library has been
installed in some non-standard library path. If so, pass it to configure,
via the LDFLAGS environment variable.
Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
============================================================================
ERROR!
You probably have to install the development version of the Python package
for your distribution. The exact name of this package varies among them.
============================================================================
])
PYTHON_VERSION=""
fi
AC_LANG_POP
# turn back to default flags
CPPFLAGS="$ac_save_CPPFLAGS"
LIBS="$ac_save_LIBS"
#
# all done!
#
])
</pre>
</div>
<h2>
License
</h2>
<div class="indent">
<span style="white-space:nowrap;">Copyright © 2006 Sebastian Huber
<sebastian-huber@web.de></span><br>
<span style="white-space:nowrap;">Copyright © 2006 Alan W. Irwin
<irwin@beluga.phys.uvic.ca></span><br>
<span style="white-space:nowrap;">Copyright © 2006 Rafael Laboissiere
<rafael@laboissiere.net></span><br>
<span style="white-space:nowrap;">Copyright © 2006 Andrew Collier
<colliera@ukzn.ac.za></span><br>
<span style="white-space:nowrap;">Copyright © 2006 Matteo Settenvini
<matteo@member.fsf.org></span><br>
<span style="white-space:nowrap;">Copyright © 2006 Horst Knorr
<hk_classes@knoda.org></span>
<p>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
</p>
<p>
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
</p>
<p>
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc., 59
Temple Place - Suite 330, Boston, MA 02111-1307, USA.
</p>
<p>
As a special exception, the respective Autoconf Macro's copyright owner
gives unlimited permission to copy, distribute and modify the configure
scripts that are the output of Autoconf when processing the Macro. You need
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distributing such scripts, even though portions of the text of the Macro
appear in them. The GNU General Public License (GPL) does govern all other
use of the material that constitutes the Autoconf Macro.
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<p>
This special exception to the GPL applies to versions of the Autoconf Macro
released by the Autoconf Macro Archive. When you make and distribute a
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exception to the GPL to apply to your modified version as well.
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