For starters, you have a lot of load-path shadows, including Gnus.
Bytecode breakage could easily be due to some kind of mix'n'match
problem.
Sure, but I re-bytecompile everything in such cases.
Second, overflows and GPFs in e_r_o sound like stack stompage to me.
That could easily be large regexps. Try
cd src rm regex.o @cl -nologo -W3 -DSTRICT -ZI -Od -G6 -Gr -MDd
-DREGEX_MALLOC -o regex.o regex.c # or however you say that in MS-land
^^^^^^^^^^^^^^^^
This is the right one ! It is mandatory to me. It even fixed the problem
that I couldn't run compiled with -O2.
Third, if you're building with Mule, get rid of anything that
shadows
core from the mule-base package. Ben moved some stuff from the
package to the core for 21.5.
Sorry, the directories where empty. I noticed that.
Many, many thanks,
Fabrice