linux-kernel - Re: [m68k:master 1174/1174] arch/m68k/include/asm/string.h:72:25: warning: '__builtin_memcpy' forming offset 8 is out of the bounds [0, 7]

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Message-ID: <CAMuHMdU9gke1=5PfjpJWuUbSBQ=bPQjpEVD3+t3F3tHvh9szWg@mail.gmail.com>
Date:   Mon, 11 Mar 2019 11:05:44 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Andreas Schwab <schwab@...ux-m68k.org>
Cc:     Finn Thain <fthain@...egraphics.com.au>,
        kbuild test robot <lkp@...el.com>, kbuild-all@...org,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [m68k:master 1174/1174] arch/m68k/include/asm/string.h:72:25:
 warning: '__builtin_memcpy' forming offset 8 is out of the bounds [0, 7]

Hi Andreas,

On Mon, Mar 11, 2019 at 10:56 AM Andreas Schwab <schwab@...ux-m68k.org> wrote:
> On Mär 11 2019, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > On Thu, Mar 7, 2019 at 10:42 PM Finn Thain <fthain@...egraphics.com.au> wrote:
> >> No, the link fails because the compiler still emits some references to
> >> strlen().
> >
> > Despite -ffreestanding?!?
>
> *Because* of -ffreestanding.  Without that, strlen would be recognized
> and turned into __builtin_strlen.

Now I'm confused: if we have a static inline or #define for strlen(), why
would the compiler still emit references to the strlen() symbol?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds