New submission from William Proffitt :
Wasn't sure where to file this. I built Python 3.8.12 for Windows recently from
the latest bugfix source release in the cpython repository. One tricky thing
came up I wanted to write-up in case it matters to someone else.
The version of libffi in the cpython-bin-deps repository seems to be too new
for Python 3.8.12 now. The script for fetching the external dependencies
(PCBuild\get_externals.bat) on the 3.8 branch fetches whatever is newest on the
libffi branch, and this led to it downloading files starting with "libffi-8"
and the build complaining about being unable to locate "libffi-7".
I managed to resolve this by manually replacing the fetched libffi in the
externals directory with the one from this commit, the latest commit I could
find where the filenames started with "libffi-7":
https://github.com/python/cpython-bin-deps/commit/1cf06233e3ceb49dc0a73c55e04b1174b436b632
After that, I was able to successfully run "build.bat -e -p x64" in PCBuild and
"build.bat -x64" in "Tools\msi\" and end up with a working build and a working
installer.
(Side note that isn't that important for me but maybe worth mentioning while
I'm here: the uninstaller on my newly minted installer didn't seem to work at
all and I had to manually resort to deleting registry keys to overwrite my
previous attempted install.)
--
components: Build, Installation, Windows, ctypes
messages: 402318
nosy: paul.moore, proffitt, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Compiling 3.8 branch on Windows attempts to use incompatible libffi
version
type: compile error
versions: Python 3.8
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<https://bugs.python.org/issue45257>
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