GNU bug report logs - #18995
Error: Could not reserve dynamic heap area.

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From: Alexander Shukaev <haroogan <at> gmail.com>
To: Daniel Colascione <dancol <at> dancol.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 18995-done <at> debbugs.gnu.org
Subject: bug#18995: Error: Could not reserve dynamic heap area.
Date: Sun, 9 Nov 2014 17:30:38 +0100

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>
> How can this be a bug in our code? Wraparound of unsigned values is
> well-defined.


True, it is well-defined, but it was not intended for sure, hence it's a
100% bug. Eli's term of "undefined behavior" was an exaggeration I think.

I don't think the compiler is justified in making this optimization.
> Since when is an infinite loop undefined behavior? GCC has no right to
> alter program semantics in this case, loop unrolling or no.


I would agree here, throwing out wrapped loop is just too much even though
such loop was unintended. GCC should have either left it alone since it is
infinite or make a warning. I think this case is still worth showing to GCC
developers.

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