[U-Boot] [PATCH v3 19/19] sunxi: update Pine64 README

[Tom Rini]

On Thu, Apr 20, 2017 at 12:21:41AM +0200, Andreas Färber wrote:
> Am 18.04.2017 um 22:38 schrieb André Przywara:
> > On 16/04/17 02:20, Andreas Färber wrote:
> >> Build-testing this series with both pine64_plus_defconfig and
> >> orangepi_pc2_defconfig, I ran into a ~1616 size overflow with gcc5. gcc6
> >> worked okay. Would be helpful to document such requirements here.
> > 
> > Can you say which version of GCC 5? I think I used GCC 5.3.0 for a while
> > and this was fine, but I need to re-check this.
> 
> Failure was with a Linaro GCC 5.1.
> 
> Working was Linaro GCC 6.3.1.
> 
> I would happily use our latest SUSE GCC 7.0.1 if only U-Boot had a
> private libgcc for aarch64... :(

With some quick hacking here, we could get away with adding
arch/arm/lib/dummy.S, with a comment of why (to have an empty lib.a be
generated) and then we could fake out the not-required libgcc.

The other way to go here would be to see what platforms really require
-lgcc and introduce another flag, CONFIG_USE_COMPILER_LIBGCC and then
allow for PLATFORM_LIBGCC to just be empty.

-- 
Tom
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