Python

Download Source:	http://www.python.org/ftp/python/2.7.8/Python-2.7.8.tar.bz2
Required Patch:	http://svn.cross-lfs.org/svn/repos/patches/Python/Python-2.7.8-gdbm-1.patch
Required Patch (For Multilib):	http://svn.cross-lfs.org/svn/repos/patches/Python/Python-2.7.8-multilib-1.patch

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Introduction to Python

Python is a dynamic object-oriented programming language that can be used for many kinds of software development. It offers strong support for integration with other languages and tools, comes with extensive standard libraries, and can be learned in a few days. Many Python programmers report substantial productivity gains and feel the language encourages the development of higher quality, more maintainable code.

Project Homepage: http://www.python.org/

Dependencies

Optional

• OpenSSL
• Tk
• GDBM
• X Window System

Non-Multilib

Note

If the test suite (make test) fails because it cannot find python's math library, then you will need to install python before you can run the tests.

Note

If the installation of python fails, rebuild python. It appears to be somewhat inconsistant with regards to whether it works or not. The -fwrapv flag used with make attempts to fixes this. If it still doesn't complete make install without failing, then use make -i install instead (-i tells make to ignore errors). It's less desirable, but it should work. The other option is to run make install twice. The second time around it locates the installed python libraries it needs for the installation and is able to complete it.

Compile the package:

sed -i "s@/usr/X11R6@${XORG_PREFIX}@g" setup.py &&
patch -Np1 -i ../Python-2.7.8-gdbm-1.patch &&
./configure --prefix=/usr --enable-shared &&
make EXTRA_CFLAGS="-fwrapv"

Install the package

make install

Command Explanations

--enable-shared: Enables the building of shared libraries.

-fwrapv: This flag is used to make it so that make test can find the python libraries and so that make install doesn't fail. Why this fixes the problem is unknown. According to GCC, -fwrapv "instructs the compiler to assume that signed arithmetic overflow of addition, subtraction and multiplication wraps around using twos-complement representation."

Multilib

32Bit

Compile the package:

sed -i "s@/usr/X11R6@${XORG_PREFIX}@g" setup.py &&
patch -Np1 -i ../Python-2.7.8-gdbm-1.patch &&
CC="gcc ${BUILD32}" CXX="g++ ${BUILD32}" ./configure --prefix=/usr \
    --enable-shared &&
make EXTRA_CFLAGS="-fwrapv"

Install the package

make install &&
mv -v /usr/bin/python{,-32} &&
mv -v /usr/bin/python2.7{,-32} &&
rm -v /usr/bin/python-config &&
mv -v /usr/bin/python2.7-config{,-32} && 
mv -v /usr/include/python2.7/pyconfig{,-32}.h

N32

Change the libdir that Python is going to use to lib32:

patch -Np1 -i ../Python-2.7.8-multilib-1.patch
sed -i -e "s:@@MULTILIB_DIR@@:lib32:g" \
        Lib/distutils/command/install.py \
        Lib/distutils/sysconfig.py \
        Lib/site.py \
        Makefile.pre.in \
        Modules/Setup.dist \
        Modules/getpath.c \
        setup.py

Compile the package:

sed -i "s@/usr/X11R6@${XORG_PREFIX}@g" setup.py &&
patch -Np1 -i ../Python-2.7.8-gdbm-1.patch &&
CC="gcc ${BUILDN32}" CXX="g++ ${BUILDN32}" ./configure --prefix=/usr \
    --libdir=/usr/lib32 --enable-shared &&
make EXTRA_CFLAGS="-fwrapv"

Install the package

make install &&
mv -v /usr/bin/python{,-n32} &&
mv -v /usr/bin/python2.7{,-n32} &&
rm -v /usr/bin/python-config &&
mv -v /usr/bin/python2.7-config{,-n32} && 
mv -v /usr/include/python2.7/pyconfig{,-n32}.h

64Bit

Change the libdir that Python is going to use to lib64:

patch -Np1 -i ../Python-2.7.8-multilib-1.patch
sed -i -e "s:@@MULTILIB_DIR@@:lib64:g" \
        Lib/distutils/command/install.py \
        Lib/distutils/sysconfig.py \
        Lib/site.py \
        Makefile.pre.in \
        Modules/Setup.dist \
        Modules/getpath.c \
        setup.py

Compile the package:

sed -i "s@/usr/X11R6@${XORG_PREFIX}@g" setup.py &&
patch -Np1 -i ../Python-2.7.8-gdbm-1.patch &&
CC="gcc ${BUILD64}" CXX="g++ ${BUILD64}" ./configure --prefix=/usr \
    --libdir=/usr/lib64 --enable-shared &&
make EXTRA_CFLAGS="-fwrapv"

Install the package

make install &&
mv -v /usr/bin/python{,-64} &&
mv -v /usr/bin/python2.7{,-64} &&
rm -v /usr/bin/python-config &&
mv -v /usr/bin/python2.7-config{,-64} && 
ln -sfv multiarch_wrapper /usr/bin/python &&
ln -sfv multiarch_wrapper /usr/bin/python2.7 &&
ln -sfv multiarch_wrapper /usr/bin/python2.7-config
ln -sfv /usr/bin/python2.7-config /usr/bin/python-config
mv -v /usr/include/python2.7/pyconfig{,-64}.h

Creating a Stub Header (Multilib Only)

Creating a Generic Stub Header

cat > /usr/include/python2.7/pyconfig.h << "EOF"
/* pyconfig.h - Stub Header  */
#ifndef __STUB__PYCONFIG_H__
#define __STUB__PYCONFIG_H__

#if defined(__x86_64__) || \
    defined(__sparc64__) || \
    defined(__arch64__) || \
    defined(__powerpc64__) || \
    defined (__s390x__)
# include "pyconfig-64.h"
#else
# include "pyconfig-32.h"
#endif

#endif /* __STUB__PYCONFIG_H__ */
EOF

Creating a Stub Header For Mips

cat > /usr/include/python2.7/pyconfig.h << "EOF"
/* pyconfig.h - Stub Header  */
#ifndef __STUB__PYCONFIG_H__
#define __STUB__PYCONFIG_H__

#include <sgidefs.h>

#if (_MIPS_SIM == _ABIO32)
# include "pyconfig-32.h"
#elif (_MIPS_SIM == _ABIN32)
# include "pyconfig-n32.h"
#elif (_MIPS_SIM == _ABI64)
# include "pyconfig-64.h"
#endif

#endif /* __STUB__PYCONFIG_H__ */
EOF

Contents

Installed Programs:	pydoc, python, python2.7, python-config, python2.7-config, smtpd.py, and (if Tk is installed) idle
Installed Libraries:	libpython2.7.so and various modules in /usr/lib/lib-dynload
Installed Directories:	/usr/include/python2.7, /usr/lib/python2.7

Short Descriptions

pydoc	is a tool for reading python documentation.
python	is an interpreted, interactive, object-oriented programming language.
python2.7	is a version-specific version of python.
python-config	is a symlink to python2.7-config.
python2.7.8-config	???
smtpd.py	is a Python implemention of the minimal SMTP protocol as defined in RFC 821.
idle	is an Integrated DeveLopment Environment (IDLE) for Python. It's based on Tkinter, Python's bindings to the Tk widget set.
libpython2.7.so	???