https://bugs.exim.org/show_bug.cgi?id=2923
--- Comment #3 from Jeremy Harris <jgh146exb@???> ---
I run Exim in production with a normal build. There are no signs of a
"stack overflow".
So at first sight whatever this compiler switch is doing is bogus.
Certainly the lack of detail on what and where it tripped is unhelpful.
Documentation for this #define seems hard to find.
You could try setting up for setuid-coredumps, to try to get
a stacktrace.
I do note that
https://man7.org/linux/man-pages/man7/feature_test_macros.7.html
says "some conforming programs might fail".
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