linux-kernel - Re: Unify the various copies of libgcc into lib

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Message-ID: <CAMuHMdUP2RbjV+09UGkzjJcRrsoyy9F6XT8fbCPEd0mQCDFvFw@mail.gmail.com>
Date:   Wed, 24 May 2017 11:21:22 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Michal Simek <monstr@...str.eu>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Chen Liqin <liqin.linux@...il.com>,
        Lennox Wu <lennox.wu@...il.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: Unify the various copies of libgcc into lib

Hi Palmer,

On Wed, May 24, 2017 at 12:05 AM, Palmer Dabbelt <palmer@...belt.com> wrote:
> I'm in the process of submitting the RISC-V Linux port, and someone noticed
> that we were adding copies of some libgcc emulation routines that were the same
> as some of the other ports.  This prompted me to go through and check all the
> ports for libgcc.h and to merge the versions that were functionally identical.
>
> The only difference in libgcc.h was that there was a #define for little vs big
> endian.  The differences in the emulation routines were all just whitespace.
>
> This patch set comes in two parts:
>
>  * Patch 1 adds new copies of all the C files copied from libgcc, as well as
>    moving libgcc.h to include/lib (that's a new folder, which probably means
>    it's the wrong place to put it, but I couldn't find anything better).  There
>    are Kconfig entries for each of these library functions so architectures can
>    select them one at a time.

I would call the Kconfig symbols GENERIC_* instead of LIB_*, for consistency
with other generic implementations.

>  * The rest of the patches convert each architecture over to the new system.

Thanks! For all but "[PATCH 4/7] mips: ...":

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>

> Unless I screwed something up, this patch set shouldn't actually change any
> functionality.  Unfortunately I don't actually have all these cross compilers
> setup so I can't actually test any of this, but I did convert the RISC-V port
> over to using this system and it appears to be OK there so at least this isn't
> completely broken.

https://www.kernel.org/pub/tools/crosstool/

BTW, blackfin, h8300, m68k, and parisc have their own implementations, too.
They look different, but I believe their functionality is identical.
They can be converted later, though.

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