GNU bug report logs - #51104
comp-tests.elc messes up after reconfiguring for different machine

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Emacs bug reports and feature requests <bug-gnu-emacs <at> gnu.org>
Cc: Andrea Corallo <andrea_corallo <at> yahoo.it>
Subject: comp-tests.elc messes up after reconfiguring for different machine
Date: Fri, 8 Oct 2021 15:59:06 -0700

When trying out the emacs-28 branch on both 32- and 64-bit platforms, I 
had test failures that I tracked down to this line:

test/src/comp-tests.el:933:       (integer ,most-negative-fixnum 
,most-positive-fixnum))

My problem was that I'd built test/src/comp-tests.elc on a 32-bit 
platform (using "./configure CC='gcc -m32'" on an x86-64 machine) so 
that .elc file had been built assuming 32-bit values for 
most-negative-fixnum and most-positive fixnum. When I then re-ran 
'configure' for a 64-bit platform the .elc files were not automatically 
rebuilt for it (they're supposed to be machine-independent, right?) and 
so the optimizations were incorrect for a 64-bit platform and the tests 
failed.

What's a good way to fix this problem, while still testing everything 
that comp-tests.el wants to test?

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