linux-kernel - Re: [PATCH v4] Fixes for compiling with clang

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Message-ID: <CAOFdcFMTQbkE4ODTmrxq2dkzkNV8PXcMD0V3UhXyL62xvhgTGA@mail.gmail.com>
Date:   Thu, 1 Dec 2016 10:13:30 -0800
From:   Peter Foley <pefoley2@...oley.com>
To:     Michal Marek <mmarek@...e.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v4] Fixes for compiling with clang

On Tue, Nov 29, 2016 at 6:22 AM, Michal Marek <mmarek@...e.com> wrote:
> Dne 28.11.2016 v 07:44 Peter Foley napsal(a):
> This adds new -Wno-* options also for the gcc case, is there a reason
> for this? Also, the -Wno-missing-field-initializers option is not
> available in some old gccs, so we would need a HOSTCC equivalent of
> cc-disable-warning.
>
> Michal

It appeared that the conditional was simply reversed, as
-fno-delete-null-pointer-checks is only supported by gcc, and
explicitly not supported by clang.
(see https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/Makefile?id=61163efae02040f66a95c8ed17f4407951ba58fa)
It could be that the fno-delete-null-pointer-checks option was simply
misplaced, and the Wno-options should still be guarded by if(clang),
would that be a better approach?

Thanks,

Peter