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

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Package: emacs;

Reported by: Glenn Morris <rgm <at> gnu.org>

Date: Tue, 11 Dec 2018 19:00:02 UTC

Severity: minor

Found in version 27.0.50

Fixed in version 29.0.50

Done: Glenn Morris <rgm <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Paul Eggert <paul.eggert <at> verizon.net>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 33709 <at> debbugs.gnu.org
Subject: bug#33709: 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.
This bug report was last modified 3 years and 172 days ago.

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