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

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Message-ID: <CAK7LNAR2efi4e3-st-hP3T7v=Hkb81beKibgYeKzxs3Q3kP0uA@mail.gmail.com>
Date:   Thu, 6 Apr 2017 03:08:26 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Michael Davidson <md@...gle.com>
Cc:     Michal Marek <mmarek@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Shaohua Li <shli@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Kaehlcke <mka@...omium.org>, X86 ML <x86@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <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

Hi Michael,

2017-03-17 9:15 GMT+09:00 Michael Davidson <md@...gle.com>:
> Unfortunately, while clang generates a warning about these flags
> being unsupported it still exits with a status of 0 so we have
> to explicitly disable them instead of just using a cc-option check.
>
> Signed-off-by: Michael Davidson <md@...gle.com>


Instead, does the following work for you?
https://patchwork.kernel.org/patch/9657285/


You need to use
$(call cc-option, ...)
for -falign-jumps=1 and -falign-loops=1



-- 
Best Regards
Masahiro Yamada