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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Glenn Morris <rgm <at> gnu.org>
Subject: bug#33709: closed (Re: bug#33709: Hang when compiled with
 --coverage and gcc 7.3)
Date: Sat, 29 Jan 2022 19:19:02 +0000

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Your bug report

#33709: Hang when compiled with --coverage and gcc 7.3

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 33709 <at> debbugs.gnu.org.

-- 
33709: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=33709
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Glenn Morris <rgm <at> gnu.org>
To: 33709-done <at> debbugs.gnu.org
Subject: Re: bug#33709: Hang when compiled with --coverage and gcc 7.3
Date: Sat, 29 Jan 2022 14:18:00 -0500

Version: 29.0.50

In https://hydra.nixos.org/build/165911357 I stopped forcing gcc 4.8
in the coverage build. It worked ok with gcc 7.3.0.

Ref
http://git.savannah.gnu.org/cgit/hydra-recipes.git/diff/?id=f7344f0e8d56f57de28d4259db96e31f6a013812&id2=5686a5540572a2a6fbc2ba81a429ebdb36fcb631

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From: Glenn Morris <rgm <at> gnu.org>
To: submit <at> debbugs.gnu.org
Subject: Hang when compiled with --coverage and gcc 7.3
Date: Tue, 11 Dec 2018 13:59:34 -0500

Package: emacs
Version: 27.0.50

The Emacs hydra jobset at https://hydra.nixos.org/jobset/gnu/emacs-trunk
was recently updated to a more recent version of the Nix package
collection. Ever since then, the "coverage" job (which is the one that
runs "make check") has timed out after spending hours failing to
compiled the first test .el file.

I have reproduced the problem on RHEL 7.6 as follows:

bootstrap as normal
./make-dist --snapshot --no-check --no-changelog --no-compress
tar xvf ../emacs-27.0.50.tar
cd emacs-27.0.50

scl enable devtoolset-7  # this enables gcc 7.3.1 as the default compiler
export CFLAGS=--coverage
./configure --without-all --without-x --without-libgmp
make -j8

The build completes fine, but now eg:

./src/emacs --help

never exits. It prints the usage message, then hangs.

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