b84ffd85e2
Until now, the Python build system was building a _dbm.cpython-*.so
native module when BR2_PACKAGE_PYTHON3_BERKELEYDB was enabled, but
since the bump of Python to 3.11.x, it was no longer building this
native module.
Investigation this, we found out that Python 3.11 changed how libdb
was detected [1] and that check now fails:
quoting configure log:
checking for libdb... no
quoting python config.log:
conftest.c:(.text.startup+0x8): undefined reference to `__db_ndbm_open'
However, in fact it turns that this problem is not new in Python
3.11. In Python 3.10, the build system was always producing the native
module, but it was in fact not working at runtime:
>>> from _dbm import *
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: /usr/lib/python3.10/lib-dynload/_dbm.cpython-310-arm-linux-gnueabihf.so: undefined symbol: __db_ndbm_delete
It was not really visible because when one does "import dbm", it
actually tries several "backends", including ndbm (which relies on
_dbm above), and if it doesn't work, it falls back silently on a pure
Python implementation.
So the issue was never noticed, but has already been there,
potentially forever.
In order for this _dbm native module to be built (Python >= 3.11) or
to work (Python < 3.11), the BerkeleyDB library need to be built with
its so-called "dbm" interface, which we do by selecting select
BR2_PACKAGE_BERKELEYDB_DBM.
And now:
>>> import _dbm
>>>
[1] d2340ef257/configure.ac (L4002)
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
[Thomas: did more research to have a better explanation of what is
happening, and realize the problem is not related to Python 3.11]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
132 lines
2.9 KiB
Plaintext
132 lines
2.9 KiB
Plaintext
comment "python3 needs a toolchain w/ wchar, threads, dynamic library"
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depends on BR2_USE_MMU
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depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
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config BR2_PACKAGE_PYTHON3
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bool "python3"
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depends on BR2_USE_WCHAR
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# uses fork()
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depends on BR2_USE_MMU
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depends on BR2_TOOLCHAIN_HAS_THREADS # libffi
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depends on !BR2_STATIC_LIBS
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select BR2_PACKAGE_LIBFFI
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select BR2_PACKAGE_BLUEZ5_UTILS_HEADERS if BR2_PACKAGE_BLUEZ5_UTILS
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help
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The python language interpreter.
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http://www.python.org/
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if BR2_PACKAGE_PYTHON3
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choice
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prompt "python3 module format to install"
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default BR2_PACKAGE_PYTHON3_PYC_ONLY
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help
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Select Python module format to install on target (py, pyc or
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both)
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config BR2_PACKAGE_PYTHON3_PY_ONLY
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bool ".py sources only"
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config BR2_PACKAGE_PYTHON3_PYC_ONLY
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bool ".pyc compiled sources only"
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config BR2_PACKAGE_PYTHON3_PY_PYC
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bool ".py sources and .pyc compiled"
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endchoice
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menu "core python3 modules"
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comment "The following modules are unusual or require extra libraries"
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config BR2_PACKAGE_PYTHON3_2TO3
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bool "2to3 module"
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help
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code translation from python 2 to 3
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config BR2_PACKAGE_PYTHON3_BERKELEYDB
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bool "berkeleydb"
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select BR2_PACKAGE_BERKELEYDB
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select BR2_PACKAGE_BERKELEYDB_DBM
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help
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berkeleydb module for Python3
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config BR2_PACKAGE_PYTHON3_BZIP2
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bool "bz2 module"
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select BR2_PACKAGE_BZIP2
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help
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bzip2 module for Python3
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config BR2_PACKAGE_PYTHON3_CODECSCJK
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bool "codecscjk module"
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help
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Chinese/Japanese/Korean codecs module for Python (large).
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config BR2_PACKAGE_PYTHON3_CURSES
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bool "curses module"
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select BR2_PACKAGE_NCURSES
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help
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curses module for Python3.
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config BR2_PACKAGE_PYTHON3_DECIMAL
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bool "decimal module"
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select BR2_PACKAGE_MPDECIMAL
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help
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decimal module for Python3.
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config BR2_PACKAGE_PYTHON3_OSSAUDIODEV
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bool "ossaudiodev module"
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help
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ossaudiodev module for Python3.
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config BR2_PACKAGE_PYTHON3_READLINE
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bool "readline"
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select BR2_PACKAGE_READLINE
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help
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readline module for Python3 (required for command-line
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editing in the Python shell).
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config BR2_PACKAGE_PYTHON3_SSL
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bool "ssl"
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select BR2_PACKAGE_OPENSSL
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select BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL
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select BR2_PACKAGE_LIBOPENSSL_ENABLE_BLAKE2
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help
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_ssl module for Python3 (required for https in urllib etc).
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config BR2_PACKAGE_PYTHON3_UNICODEDATA
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bool "unicodedata module"
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default y
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help
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Unicode character database (used by stringprep module)
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(large).
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config BR2_PACKAGE_PYTHON3_SQLITE
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bool "sqlite module"
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select BR2_PACKAGE_SQLITE
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help
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SQLite database support
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config BR2_PACKAGE_PYTHON3_PYEXPAT
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bool "xml module"
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select BR2_PACKAGE_EXPAT
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help
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pyexpat and xml libraries for Python3.
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config BR2_PACKAGE_PYTHON3_XZ
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bool "xz module"
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select BR2_PACKAGE_XZ
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help
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xz (a.k.a lzma) module for Python3
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config BR2_PACKAGE_PYTHON3_ZLIB
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bool "zlib module"
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select BR2_PACKAGE_ZLIB
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help
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zlib support in Python3
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endmenu
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endif
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