Bug 1898060 - libproxy fails to build with Python 3.10: Could NOT find Python3Interp (truncates Python version to 3.1)
Summary: libproxy fails to build with Python 3.10: Could NOT find Python3Interp (trunc...
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: libproxy
Version: rawhide
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: David King
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: PYTHON3.10
TreeView+ depends on / blocked
Reported: 2020-11-16 10:05 UTC by Miro Hrončok
Modified: 2021-02-09 16:23 UTC (History)
6 users (show)

Fixed In Version:
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Type: Bug

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Description Miro Hrončok 2020-11-16 10:05:58 UTC
libproxy fails to build with Python 3.10.0a2.

-- Could NOT find Python3Interp (missing: PYTHON3_EXECUTABLE PYTHON3_VERSION_STRING) 
RPM build errors:
error: File not found: /builddir/build/BUILDROOT/libproxy-0.4.15-27.fc34.x86_64/usr/lib/python3.10/site-packages/__pycache__/*
error: File not found: /builddir/build/BUILDROOT/libproxy-0.4.15-27.fc34.x86_64/usr/lib/python3.10/site-packages/libproxy.*
    File not found: /builddir/build/BUILDROOT/libproxy-0.4.15-27.fc34.x86_64/usr/lib/python3.10/site-packages/__pycache__/*
    File not found: /builddir/build/BUILDROOT/libproxy-0.4.15-27.fc34.x86_64/usr/lib/python3.10/site-packages/libproxy.*

For the build logs, see:

For all our attempts to build libproxy with Python 3.10, see:

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.10:

Let us know here if you have any questions.

Python 3.10 will be included in Fedora 35. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.10.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.

Setting severity to high, because libproxy is a critpath package.

Comment 1 Miro Hrončok 2020-11-16 10:08:54 UTC
This is because the Python version is constructed in CMakeLists.txt via string slicing to 3 characters:

$ rg -F 'sys.version' libproxy-0.4.15
9:		    -c "import sys; print (sys.version[0:3])"

9:		    -c "import sys; print (sys.version[0:3])"

$ python3.10 -c "import sys; print (sys.version[0:3])"

I recommend using something like this instead:

$ python3.10 -c "import sys; print('{}.{}'.format(*sys.version_info[0:2]))"

Comment 2 Ben Cotton 2021-02-09 16:11:53 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 34 development cycle.
Changing version to 34.

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