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 an interpreted, interactive, object-oriented programming language that combines remarkable power with very clear syntax. For an introduction to programming in Python you are referred to the Python Tutorial. The Python Library Reference documents built-in and standard types, constants, functions and modules. Finally, the Python Reference Manual describes the syntax and semantics of the core language in (perhaps too) much detail. (These documents may be located via http://www.python.org; they may be installed on your system as well.)

Python's basic power can be extended with your own modules written in C or C++. On most systems such modules may be dynamically loaded. Python is also adaptable as an extension language for existing applications. See the internal documentation for hints.

Documentation for installed Python modules and packages can be viewed by running the pydoc program.

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:

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:

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} &&
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:

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} &&
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:

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} &&
ln -sfv multiarch_wrapper /usr/bin/python &&
ln -sfv multiarch_wrapper /usr/bin/python2.7 &&
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.h << "EOF"
/* pyconfig.h.h - Stub Header  */
#ifndef __STUB__PYCONFIG.H_H__
#define __STUB__PYCONFIG.H_H__

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

#endif /* __STUB__PYCONFIG.H_H__ */
EOF

Creating a Stub Header For Mips

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

#include <sgidefs.h>

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

#endif /* __STUB__PYCONFIG.H_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	???