GNU bug report logs - #77828
LTO build fails with grep 3.12

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Christian Hesse <list <at> eworm.de>
Subject: bug#77828: closed (Re: bug#77828: LTO build fails with grep 3.12)
Date: Sun, 20 Apr 2025 06:42:02 +0000

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Your bug report

#77828: LTO build fails with grep 3.12

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

The explanation is attached below, along with your original report.
If you require more details, please reply to 77828 <at> debbugs.gnu.org.

-- 
77828: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=77828
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Christian Hesse <list <at> eworm.de>
Cc: 77828-done <at> debbugs.gnu.org
Subject: Re: bug#77828: LTO build fails with grep 3.12
Date: Sat, 19 Apr 2025 23:41:17 -0700

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On 2025-04-15 10:01, Christian Hesse wrote:

> The build succeed as soon as I disable link time optimization. Would be nice
> to have a fix for this to reenable lto.

Thanks for reporting that. It's a false alarm from GCC. I worked around 
the problem by installing the attached patch into Gnulib to pacify GCC, 
and I'm closing the grep bug report.

[0001-dfa-pacify-gcc-Wstringop-overflow.patch (text/x-patch, attachment)]

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From: Christian Hesse <list <at> eworm.de>
To: bug-grep <at> gnu.org
Subject: LTO build fails with grep 3.12
Date: Tue, 15 Apr 2025 19:01:59 +0200

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Hello everybody,

I am building grep 3.12 in a clean build environment for Arch Linux. That
fails when building with link time optimization is enabled:

  CCLD     grep
In function 'dfaoptimize',
    inlined from 'dfaanalyze' at ../lib/dfa.c:2873:3:
../lib/dfa.c:2606:12: error: writing 1 byte into a region of size 0
  [-Werror=stringop-overflow=] 2606 |   flags[0] |= OPT_QUEUED;
      |            ^
In function 'icalloc',
    inlined from 'xicalloc' at ../lib/xmalloc.c:304:10,
    inlined from 'xizalloc' at ../lib/xmalloc.c:289:10,
    inlined from 'dfaoptimize' at ../lib/dfa.c:2589:17,
    inlined from 'dfaanalyze' at ../lib/dfa.c:2873:3:
../lib/ialloc.h:91:10: note: destination object of size [0,
  9223372036854775807] allocated by 'calloc' 91 |   return calloc (n, s);
      |          ^
lto1: all warnings being treated as errors

The build succeed as soon as I disable link time optimization. Would be nice
to have a fix for this to reenable lto. Let me know if I can provide more
information on this. Thanks!
-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Best regards             my address:    */=0;b=c[a++];)
putchar(b-1/(/*    Chris            cc -ox -xc - && ./x    */b/42*2-3)*42);}

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