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Date:   Thu, 3 Feb 2022 12:45:49 -0800
From:   Nick Desaulniers <>
To:     Kees Cook <>
Cc:, Arvind Sankar <>,
        Fangrui Song <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,
        Dave Hansen <>,
        "H. Peter Anvin" <>,
        Nathan Chancellor <>,
        Andi Kleen <>,,,
Subject: Re: [PATCH v2] x86/build: don't build CONFIG_X86_32 as -ffreestanding

On Thu, Feb 3, 2022 at 12:40 PM Kees Cook <> wrote:
> From: Nick Desaulniers <>
> -ffreestanding typically inhibits "libcall optimizations" where calls to
> certain library functions can be replaced by the compiler in certain
> cases to calls to other library functions that may be more efficient.
> This can be problematic for embedded targets that don't provide full
> libc implementations.

While the bcmp shenanigans were ultimately resolved by
commit 5f074f3e192f ("lib/string.c: implement a basic bcmp")
(and this popped up again in
commit 1e1b6d63d634 ("lib/string.c: implement stpcpy")
).  I'm still very much in favor of this patch, and should have
pursued it. Thanks for resending!

~Nick Desaulniers

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