linux-kernel - Re: [PATCH 2/7] Makefile, x86, LLVM: disable unsupported optimization flags

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Message-ID: <74cbe721-40c0-f78c-7a55-9f4fcf63c7d3@zytor.com>
Date:   Fri, 17 Mar 2017 14:34:45 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Michael Davidson <md@...gle.com>, Michal Marek <mmarek@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Shaohua Li <shli@...nel.org>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Kaehlcke <mka@...omium.org>, x86@...nel.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: [PATCH 2/7] Makefile, x86, LLVM: disable unsupported optimization
 flags

On 03/17/17 14:32, H. Peter Anvin wrote:
> 
> NAK.  Fix your compiler, or use a wrapper script or something.  It is
> absolutely *not* acceptable to disable this since future versions of
> clang *should* support that.
> 
> That being said, it might make sense to look for a key pattern like
> "(un|not )supported" on stderr the try-run macro.  Is there really no
> -Wno- or -Werror= option to turn off this craziness?
> 

Well, guess what... I found it myself.

-W{no-,error=}ignored-optimization-argument

Either variant will make this sane.

	-hpa