linux-kernel - Re: [PATCH v4 3/3] powerpc/prom_init: Use -ffreestanding to avoid a reference to bcmp

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Message-ID: <20191014093501.GE28442@gate.crashing.org>
Date:   Mon, 14 Oct 2019 04:35:01 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] powerpc/prom_init: Use -ffreestanding to avoid a reference to bcmp

On Sun, Oct 13, 2019 at 07:51:01PM -0700, Nathan Chancellor wrote:
> r374662 gives LLVM the ability to convert certain loops into a reference
> to bcmp as an optimization; this breaks prom_init_check.sh:

When/why does LLVM think this is okay?  This function has been removed
from POSIX over a decade ago (and before that it always was marked as
legacy).


Segher