python312 @3.12.5_0+lto+optimizations: aborts with ctypes

[quintusdias (John G Evans)]

I have a package called glymur that uses ctypes to interface with the openjpeg library and I have been running into segfaults when using python312 on intel. The more I try to isolate the bug, the more I think might not have anything to do with the openjpeg port, but rather with the ctypes module on python312.

The attached reproduction steps are basically pulled from the official python documentation at ​https://docs.python.org/3/library/ctypes.html#ctypes-callback-functions. It produces segfaults on python312, but not on python311 or python310. It also does not produce segfaults on Anaconda on the same machine. I do not see the segfaults on ARM either, just intel. Removing the +lto and +optimizations variants did not seem to change anything.

[quintusdias (John G Evans)]

reproduction steps

[quintusdias (John G Evans)]

crash log from ~/Library/Logs/DiagnosticsReports

[quintusdias (John G Evans)]

Apologies, mixed up a few fields when initially filling this out.

[jmroot (Joshua Root)]

Can this be reproduced with other distributions of Python 3.12, or just MacPorts?

[jmroot (Joshua Root)]

In abd158fe8d4007feb98ec94c25d41738e1986c9a/macports-ports (master):

python312: fix crash in ctypes

The configure script was adding -DUSING_APPLE_OS_LIBFFI=1 to CFLAGS
despite building against the MacPorts libffi.

Closes: #70603