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authorJeffery To <jeffery.to@gmail.com>2020-04-01 22:11:07 +0800
committerJeffery To <jeffery.to@gmail.com>2020-04-02 14:57:30 +0800
commitc37b15e1c49cf27de8f34f43e93a7a5c184be9e0 (patch)
treea009f48d54bf7599950fbf6619004d9ef413d90e /lang/python/python-packages/README.md
parent3732cab3dfe711f9a445b1abff61178fd7c5519e (diff)
python-libraries: Remove Python 2-only packages
These are either libraries that backport Python 3 features for Python 2 programs, or libraries that have not had Python 3 variants added to them by anyone. These packages will be added to the abandoned packages feed. Signed-off-by: Jeffery To <jeffery.to@gmail.com>
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-This package allows users to package python modules without creating package
-Makefiles for each individual module and their dependencies. It provides a
-way making packaging python packages faster and may also facilitate the process
-of developing Makefiles for new python packages
-
-This is a raw DEVEL only package. Using it may entail a lot of implementation
-details and you may need to resolve target dependencies and package details on
-your own
-
-- Third party python packages may depend on features not included in e.g.
- python-light
-- Some python modules may require host install of another module to progress,
- e.g. target cryptography requires host cffi
-- Some python modules have external C library dependencies, e.g. pyOpenSSL
- requires openssl libs
-- Some packages may have an autoconf configure script whose arguments we
- cannot control with pip and has to be passed on (hacked) by overriding some
- environment variables
-
-## How it works
-
-1. Install host modules required for building target modules
-2. Install each target module to separate directories
-3. Install another copy of modules for cleanup purposes to make list of
- installed files to be removed from target modules installed in step 2
-
-Why should it be so
-
-1. Installing target cryptography requires host installation of cffi module
-2. cryptography requires setuptools and pip will install its own copy with
- --ignore-installed. When PACKAGE_python-setuptools is also selected, opkg
- will complain of data file clashes if it was not removed here.
-
-Pip will handle dependency requirements of python modules, but external
-dependencies like c libraries has to be prepared by the build system. The
-issue is that there is currently no way to express such dependencies, thus may
-cause build failure, e.g. pycrypto requires the presence of libgmp to build
-successfully.
-
-## Tips
-
-If something goes wrong, we can add additional arguments to pip command
-line to check the detailed build process. Some useful arguments may be
-
-- -v, for verbose output. Repeat this option if the current level of
- verbosity is not enough
-- --no-clean, for preserving pip build dir on build failure
-
-## Examples
-
-tornado (python-only module)
-
- CONFIG_PACKAGE_python-packages=y
- CONFIG_PACKAGE_python-packages-list="tornado==4.4.2"
-
-cryptography (requires installation of host modules and cleanup on target modules)
-
- CONFIG_PACKAGE_python-packages=y
- CONFIG_PACKAGE_python-packages-list-host="cffi"
- CONFIG_PACKAGE_python-packages-list="cryptography"
- CONFIG_PACKAGE_python-packages-list-cleanup="setuptools"
-
-pycrypto 2.7a1 (python module with autoconf configure script; depends on
-libgmp; broken wmmintrin.h). 2.6.1 does not work because of a flaw in
-the setup.py hardcoding host include directory
-
- CONFIG_PACKAGE_libgmp=y
- CONFIG_PACKAGE_python-packages=y
- CONFIG_PACKAGE_python-packages-list="https://github.com/dlitz/pycrypto/archive/v2.7a1.tar.gz"
- CONFIG_PACKAGE_python-packages-envs="ac_cv_header_wmmintrin_h=no build_alias=$(GNU_HOST_NAME) host_alias=$(GNU_TARGET_NAME) target_alias=$(GNU_TARGET_NAME)"
- CONFIG_PACKAGE_python-packages-extra-deps="libgmp.so.10"
-