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From: Krishna Narayanan <krishnanarayanan132002@gmail.com>
Date: Thu, 10 Feb 2022 00:13:40 +0530
Message-ID: <CABhGnjs7x2EceW=BLBtAvCXOMqMjwSE+XDpk0oYS+GmbDr7opw@mail.gmail.com>
Subject: Re: Extended doubt regarding the bug 93432
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: Jonathan Wakely <jwakely.gcc@gmail.com>, gcc-help <gcc-help@gcc.gnu.org>
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Noted with thanks.
Krishna Narayanan

On Wed, Feb 9, 2022 at 10:31 PM Segher Boessenkool <
segher@kernel.crashing.org> wrote:

> On Tue, Feb 08, 2022 at 05:37:12PM +0000, Jonathan Wakely via Gcc-help
> wrote:
> > It warns with -O1, which is the documented behaviour:
> >
> >       The effectiveness of some warnings depends on optimizations also
> > being enabled. For example -Wsuggest-final-types is more
> >       effective with link-time optimization and -Wmaybe-uninitialized
> does
> > not warn at all unless optimization is enabled.
> >
> > So no, I don't think it' a bug. GCC is behaving as designed. Ideally it
> > would be better at warning without optimization, but changing that would
> be
> > hard.
>
> GCC does not execute most of its code at -O0.  This is important for
> speed of course, but much more importantly it also allows us to use -O0
> when other optimisation levels crash or generate wrong code.  This is
> useful for the compiler developers of course, but it also is an
> important workaround for users, when bad things happen.
>
>
> Segher
>