A replacement buildsystem for CPython.
This CMake buildsystem has the following advantages:
- No compiled program for the target architecture is used in the build itself. This makes cross-compiling easier, less error prone, and reduces manual steps.
- Same build information for all platforms - there's no need to maintain the autotools configuration separately from four different MSVC project files.
- Support for other build systems and IDE's like Ninja, Sublime Text, and many others.
- Easily build C-extensions against other C/C++ libraries built with CMake.
- It's much faster to compile: 7 seconds instead of 58 seconds in my unscientific test.
How to use this buildsystem:
- Checkout the buildsystem
cd ~/scratch
git clone git://github.com/python-cmake-buildsystem/python-cmake-buildsystem- Build
# Unix
cd ~/scratch
mkdir -p python-build && mkdir -p python-install
cd python-build
cmake -DCMAKE_INSTALL_PREFIX:PATH=${HOME}/scratch/python-install ../python-cmake-buildsystem
make -j10
make install
# Windows
cd %HOME%/scratch
mkdir python-build
mkdir python-install
cd python-build
cmake -G "Visual Studio 16 2019" -A x64 -DCMAKE_INSTALL_PREFIX:PATH=%HOME%/scratch/python-install ../python-cmake-buildsystem
cmake --build . --config Release -- /m
cmake --build . --config Release --target INSTALLNote
By default, the build system will download the python 3.9.10 source from http://www.python.org/ftp/python/
You can pass options to CMake to control the way Python is built. You only need to give each option once - they get saved in CMakeCache.txt. Pass options on the commandline with -DOPTION=VALUE, or use the "ccmake" gui.
PYTHON_VERSION=major.minor.patch (defaults to 3.9.10)
The version of Python to build.
PYTHON_APPLY_PATCHES=ON|OFF (defaults to ON)
Apply patches required to build CPython based on the system and compiler
found when configuring the project. Note that when cross-compiling, patches
coresponding to the target system are applied.
Patches can be found in "patches" directory.
CMAKE_BUILD_TYPE=Debug|Release
Build with debugging symbols or with optimisations.
CMAKE_INSTALL_PREFIX=<path> (defaults to /usr/local)
Path in which to install Python.
DOWNLOAD_SOURCES=ON|OFF (defaults to ON)
Download, check MD5 sum and extract python sources in the parent directory.
Source archive is downloaded from http://www.python.org/ftp/python
BUILD_LIBPYTHON_SHARED=ON|OFF (defaults to OFF)
Build libpython as a shared library (.so or .dll) or a static library
(.a).
Note that Python extensions are always built as shared libraries. On
Windows it is not possible to build shared .dll extensions against a
static libpython, so you must build any extensions you want into libpython
itself (see the BUILTIN flags below).
BUILD_EXTENSIONS_AS_BUILTIN=ON|OFF (defaults to OFF)
If enabled, all extensions are statically compiled into the built python
libraries (static and/or shared).
Note that all previously set BUILTIN_<extension> options are ignored and
reset to their original value.
WITH_STATIC_DEPENDENCIES=ON|OFF (defaults to OFF, available only on UNIX)
If this is set to ON then cmake will compile statically libpython and all
extensions. External dependencies (ncurses, sqlite, ...) will be builtin
only if they are available as static libraries.
BUILD_WININST=ON|OFF (only for windows, defaults to ON if not crosscompiling)
If enabled, build the 'Windows Installer' program for distutils if not
already provided in the source tree.
BUILD_WININST_ALWAYS=ON|OFF (only for windows, defaults to OFF)
If enabled, always build 'Windows Installer' program for distutils even
if it is already provided in the source tree.
INSTALL_DEVELOPMENT=ON|OFF (defaults to ON)
If enabled, install files required to develop C extensions.
INSTALL_MANUAL=ON|OFF (defaults to ON)
If enabled, install manuals.
INSTALL_TEST=ON|OFF (defaults to ON)
If enabled, install test files.
ENABLE_<extension>=ON|OFF (defaults to ON)
BUILTIN_<extension>=ON|OFF (defaults to OFF except for POSIX, PWD and
NT extensions which are builtin by default)
These two options control how individual python extensions are built.
<extension> is the name of the extension in upper case, and without any
leading underscore (_). Known extensions for 2.7.12 include:
ARRAY AUDIOOP BINASCII BISECT BSDDB BZ2 CMATH CODECS_CN CODECS_HK
CODECS_ISO2022 CODECS_JP CODECS_KR CODECS_TW COLLECTIONS CPICKLE CRYPT
CSTRINGIO CSV CTYPES CTYPES_TEST CURSES CURSES_PANEL DATETIME DBM
ELEMENTTREE FCNTL FUNCTOOLS FUTURE_BUILTINS GDBM GRP HASHLIB HEAPQ
HOTSHOT IO ITERTOOLS JSON LINUXAUDIODEV LOCALE LSPROF LZMA MATH MMAP
MULTIBYTECODEC MULTIPROCESSING NIS NT OPERATOR OSSAUDIODEV PARSER POSIX
PWD PYEXPAT RANDOM READLINE RESOURCE SELECT SOCKET SPWD SQLITE3 SSL
STROP STRUCT SYSLOG TERMIOS TESTCAPI TIME TKINTER UNICODEDATA ZLIB
All extensions are enabled by default, but some might depend on system
libraries and will get disabled if they're not available (a list of
extensions that didn't have all their prerequisites available will be
printed when you run cmake).
By default extensions are compiled as separate shared libraries (.so or
.dll files) and installed in lib/python2.7/lib-dynload. If you set
BUILTIN_<extension> to ON then the extension is compiled into libpython
instead.
USE_LIB64=ON|OFF (defaults to OFF)
If this is set to ON then cmake will look for dependencies in lib64 as
well as lib directories. Compiled python extensions will also be
installed into lib64/python2.7/lib-dynload instead of
lib/python2.7/lib-dynload.
Py_USING_UNICODE (only for python2, defaults to ON)
Enable unicode support. By default, ucs2 is used. It can be
forced to ucs4 setting Py_UNICODE_SIZE to 4.
WITH_C_LOCALE_COERCION (only for python3.7 and above, default to ON)
Enable C locale coercion to a UTF-8 based locale.
WITH_DECIMAL_CONTEXTVAR (only for python3.8 and above, default to ON)
Build _decimal module using a coroutine-local rather than a thread-local context.
WITH_TRACE_REFS (only for python3.8 and above, default to OFF)
Enable tracing references for debugging purpose
WITH_SSL_DEFAULT_SUITES (only for python3.7 and above, default to "python")
Override default cipher suites string:
* python: use Python's preferred selection (default)
* openssl: leave OpenSSL's defaults untouched
* STRING: use a custom string, PROTOCOL_SSLv2 ignores the setting
EXTRA_PYTHONPATH=dir1:dir2 (defaults to "")
Colon (:) separated list of extra directories to add to the compiled-in
PYTHONPATH.
USE_SYSTEM_LIBRARIES=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect system libraries will be done.
Options documented below allow to enable/disable detection of particular
libraries.
USE_SYSTEM_Curses=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect Curses libraries will be done.
Associated python extensions are: CURSES, CURSES_PANEL, READLINE
Following CMake variables can manually be set: CURSES_LIBRARIES, PANEL_LIBRARIES
USE_SYSTEM_EXPAT=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect Expat libraries will be done.
Associated python extensions are: ELEMENTTREE, PYEXPAT
Following CMake variables can manually be set: EXPAT_LIBRARIES, EXPAT_INCLUDE_DIRS
USE_SYSTEM_LibFFI=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect libffi libraries will be done.
Associated python extensions are: CTYPES
Following CMake variables can manually be set: LibFFI_LIBRARY and LibFFI_INCLUDE_DIR
USE_SYSTEM_OpenSSL=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect OpenSSL libraries will be done.
Associated python extensions are: HASHLIB, SSL, MD5, SHA, SHA256, SHA512
Following CMake variables can manually be set: OPENSSL_INCLUDE_DIR, OPENSSL_LIBRARIES
If [OPENSSL_INCLUDE_DIR, OPENSSL_LIBRARIES] are found, extensions [HASHLIB, SSL] will be built
If [OPENSSL_INCLUDE_DIR, OPENSSL_LIBRARIES] are NOT found, extensions [SHA, SHA256, SHA512] will be built
USE_SYSTEM_TCL=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect Tcl libraries will be done.
Associated python extensions are: TKINTER
Following CMake variables can manually be set: TCL_LIBRARY, TK_LIBRARY, TCL_INCLUDE_PATH, TK_INCLUDE_PATH
USE_SYSTEM_ZLIB=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect ZLIB libraries will be done.
Associated python extensions are: BINASCII, ZLIB
Following CMake variables can manually be set: ZLIB_LIBRARY, ZLIB_INCLUDE_DIR, ZLIB_ROOT
ZLIB_ROOT should be set only if USE_SYSTEM_ZLIB is ON
If [ZLIB_LIBRARY, ZLIB_INCLUDE_DIR] are found, extensions [BINASCII] will be built with ZLIB_CRC32
USE_SYSTEM_DB=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect DB libraries will be done.
Associated python extensions are: BSDDB
Following CMake variables can manually be set: DB_INCLUDE_PATH, DB_LIBRARY
USE_SYSTEM_GDBM=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect GDBM libraries will be done.
Associated python extensions are: DBM, GDBM
Following CMake variables can manually be set: GDBM_INCLUDE_PATH, GDBM_LIBRARY, GDBM_COMPAT_LIBRARY, NDBM_TAG, <NDBM_TAG>_INCLUDE_PATH
USE_SYSTEM_LZMA=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect LZMA libraries will be done.
Associated python extensions are: LZMA
Following CMake variables can manually be set: LZMA_INCLUDE_PATH, LZMA_LIBRARY
USE_SYSTEM_READLINE=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect Readline libraries will be done.
Associated python extensions are: READLINE
Following CMake variables can manually be set: READLINE_INCLUDE_PATH, READLINE_LIBRARY
USE_SYSTEM_SQLite3=ON|OFF (defaults to ON)
If set to OFF, no attempt to detect SQLite3 libraries will be done.
Associated python extensions are: SQLITE3
Following CMake variables can manually be set: SQLite3_INCLUDE_DIR, SQLite3_LIBRARY
CMAKE_OSX_SDK (MacOSX, default is autodetected, e.g 'macosx10.06')
By default, the variable is automatically set running `xcrun` and/or `xcodebuild`. Note that its
value can also be explicitly set when doing a clean configuration either by adding a cache entry in
`cmake-gui` or by passing the argument `-DCMAKE_OSX_SDK:STRING=macosx10.6` when running `cmake`.
Then, this variable is used to initialize `CMAKE_OSX_SYSROOT`, `CMAKE_OSX_DEPLOYMENT_TARGET`
and `MACOSX_DEPLOYMENT_TARGET` variables.
Materials in this repository are distributed under the following licenses:
All software is licensed under the Apache 2.0 License. See LICENSE_Apache_20 file for details.
From the python.org wiki, the answer to the question What if I want to contribute my code to the PSF mentions that if code is going to end up in Python or the standard library, the PSF will require you to license code under "Academic Free License" or "Apache License 2.0".
This project supports building multiple versions of CPython 2.7 and CPython 3. See current list of supported version in top-level CMakeLists.txt.
Since this repository is maintained separately from python/CPython itself, it needs to be manually updated whenever there is a new release of Python.