Charlie Clark schrieb am 22.02.22 um 09:48:
On 21 Feb 2022, at 20:37, Jens Tröger wrote:
Yes, when I installed lxml it built locally on my Intel Mac 10.14.6 with
Python 3.9.10, and in another email I actually wanted to ask for a
pre-compiled whl:
Collecting lxml
Using cached lxml-4.8.0.tar.gz (3.2 MB)
Using legacy 'setup.py install' for lxml, since package 'wheel' is not
installed.
Installing collected packages: lxml
Running setup.py install for lxml ... done
Successfully installed lxml-4.8.0
FWIW I can confirm that this happens if lxml is built on the machine but
not with the wheel
This is locally build lxml
Python : sys.version_info(major=3, minor=9, micro=10,
releaselevel='final', serial=0)
lxml.etree : (4, 8, 0, 0)
libxml used : (2, 9, 12)
libxml compiled : (2, 9, 12)
libxslt used : (1, 1, 34)
libxslt compiled : (1, 1, 34)
3
<Element b at 0x103815a00> b'<b id="b-1">\n <c id="b-1-c">baz</c>\n
</b>\n <b id="b-2">\n <c id="b-2-c">baz</c>\n </b>\n <b
id="b-3">\n <c id="b-3-c">baz</c>\n </b>\n</a>\n '
<Element b at 0x103815a40> b'<b id="b-2">\n <c id="b-2-c">baz</c>\n
</b>\n <b id="b-3">\n <c id="b-3-c">baz</c>\n </b>\n</a>\n '
<Element b at 0x103815a80> b'<b id="b-3">\n <c id="b-3-c">baz</c>\n
</b>\n</a>\n'
And this with the wheel
Python : sys.version_info(major=3, minor=9, micro=10,
releaselevel='final', serial=0)
lxml.etree : (4, 8, 0, 0)
libxml used : (2, 9, 12)
libxml compiled : (2, 9, 12)
libxslt used : (1, 1, 34)
libxslt compiled : (1, 1, 34)
3
<Element b at 0x101b1b9c0> b'<b id="b-1">\n <c id="b-1-c">baz</c>\n
</b>\n '
<Element b at 0x101b1ba00> b'<b id="b-2">\n <c id="b-2-c">baz</c>\n
</b>\n '
<Element b at 0x101b1ba40> b'<b id="b-3">\n <c id="b-3-c">baz</c>\n </b>\n'
All libraries have the same version so it must be something else. I use
MacPorts to keep libraries up to date.
Sadly, libxml2 2.9.12 is not libxml2 2.9.12 here. On your machine, you
probably have the latest release version installed. The lxml wheels are
built with a newer git version that has a fix for this issue. Or a
work-around, if you want.
If you set STATIC_BUILD=true, and LIBXML_VERSION=2.9.12, lxml will use the
git version instead of the release version.
It would probably be worth adding a runtime detection for this issue, so
that lxml can fail to import if it finds an incompatible libxml2 version.
The broken behaviour seems heavy enough to fail hard instead of issuing
just a warning (which the build currently does, but you normally won't see
that in pip installations).
Stefan
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