GNU bug report logs - #33709
Hang when compiled with --coverage and gcc 7.3

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Message #21 received at 33709 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <paul.eggert <at> verizon.net>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 33709 <at> debbugs.gnu.org
Subject: Hang when compiled with --coverage and gcc 7.3
Date: Thu, 27 Dec 2018 20:06:56 -0800

I'm surprised that --coverage ever worked in a dumped emacs. I think libgcov 
uses the dynamic linker's malloc (so Emacs has *three* malloc implementations) 
and our trick for switching from the Emacs malloc in temacs to the system malloc 
in bootstrap-emacs won't work for memory allocated for --coverage. 
Unfortunately, the libgcov actions do not seem to be easy to disable in temacs 
and re-enable in bootstrap-emacs.

I suggest that we just say this combination isn't supported; if you want to 
build Emacs with gcc --coverage you can configure with CANNOT_DUMP=yes.

If the portable dumper ever gets working, --coverage should be easy to support, 
of course.

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