linux-kernel - Re: [PATCH v2 2/2] powerpc/math-emu: Remove -w build flag and fix warnings

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Date:   Fri, 2 Sep 2022 10:59:54 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH v2 2/2] powerpc/math-emu: Remove -w build flag and fix warnings

On Fri, Sep 02, 2022 at 08:37:23AM -0700, Nathan Chancellor wrote:
> On Fri, Sep 02, 2022 at 12:08:55PM +0200, Christophe Leroy wrote:
> > This should have been detected by gcc at build time, but due to
> > '-w' flag it went undetected.
> > 
> > Removing that flag leads to many warnings hence errors.

> Thanks for figuring out what was going on here! I took this patch for a
> spin with clang and it has a few more errors around
> -Wimplicit-fallthrough:

Maybe add -Wno-implicit-fallthrough?  This code is a copy from outside
the kernel, no one has ever wanted to maintain it, if nothing else (the
more politically correct formulation is "we cannot as easily pick up
improvements from upstream if we modify stuff").


Segher