linux-kernel - Re: [PATCH v5 0/4] ARM: ep93xx: ts72xx: Add support for BK3 board

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Message-ID: <20171217222856.2c5937a4@jawa>
Date:   Sun, 17 Dec 2017 22:28:56 +0100
From:   Lukasz Majewski <lukma@...x.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Russell King <linux@...linux.org.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v5 0/4] ARM: ep93xx: ts72xx: Add support for BK3 board

Hi Arnd,

> On Sun, Dec 17, 2017 at 8:41 PM, Lukasz Majewski <lukma@...x.de>
> wrote:
> >> >> We also need to think about upholding support in GCC for
> >> >> ARMv4(t) for the foreseeable future if there is a big web of
> >> >> random deeply embedded systems out there that will need
> >> >> updates.  
> >> >
> >> > But we should definitely preserve at least what we have.  
> >>
> >> Plain ARMv4 (and earlier) support in gcc is already marked
> >> 'deprecated' and will likely be gone in gcc-8 (it's still there as
> >> of last week). ARMv4T is going to be around for a while, and you
> >> can even keep building for ARMv4 using "-march=armv4t -marm" when
> >> linking with 'ld --fix-v4bx'.  
> >
> > I think that we shall start complaining on the gcc-devel mailing
> > list now.
> >
> > I would be hard to wake up in 2 years time and realise that we don't
> > have a modern compiler.  
> 
> What distro or build system are you using?

I'm using OE with the "include conf/machine/include/tune-arm920t.inc"

GCC 7.2 is working 

> It would also be helpful
> to test whether the -march=armv4t/--fix-v4bx workaround produces
> working binaries for you, in that case you could report to the gcc
> developers that the removal of armv4 can continue but that
> the --fix-v4bx option in ld needs to stay around.

I may ask this issue on OE/Yocto mailing list as well....

Thanks for hint.

> 
>        Arnd



Best regards,

Lukasz Majewski

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