[U-Boot] [PATCH] ARM: enable CONFIG_USE_PRIVATE_LIBGCC by default

[Albert ARIBAUD <albert.u.boot@aribaud.net>]

Hello Masahiro,

On Thu, 2 Jul 2015 21:21:12 +0900, Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
> Hi Albert,
> 
> 
> 2015-07-02 6:21 GMT+09:00 Albert ARIBAUD <albert.u.boot@aribaud.net>:
> > On Thu, 16 Apr 2015 11:21:44 +0200, Albert ARIBAUD
> > <albert.u.boot@aribaud.net> wrote:
> >> Hello Masahiro,
> >>
> >> Your patch clashes with Pavel's already committed
> >> break-if-private-libgcc-and-thumb, causing many boards to fail building.
> >>
> >> I am putting your patch in 'under review' state until I can have a look
> >> at what happens with private libgcc and thumb.
> >
> > Hmm, even with the libgcc+thumb thing fixed, this patch still causes
> > quite a few target to fail:
> >
> > - without the patch, buildman yields 503 1 12 / 516.
> > - With the patch, buildman yields 488 1 27 / 516.
> >
> > Of these, 10 are aarch64 boards which now try to build a private libgcc
> > with some hardwired 32-bit mnemonics :
> >
> > | arch/arm/lib/_ashldi3.S:21: Error: operand 1 should be an integer
> > register -- `subs r3,r2,#32' | arch/arm/lib/_ashldi3.S:22: Error: unknown mnemonic `rsb' -- `rsb ip,r2,#32'
> > | arch/arm/lib/_ashldi3.S:23: Error: unknown mnemonic `movmi' -- `movmi r1,r1,lsl r2'
> > | arch/arm/lib/_ashldi3.S:24: Error: unknown mnemonic `movpl' -- `movpl r1,r0,lsl r3'
> > | arch/arm/lib/_ashldi3.S:25: Error: unknown mnemonic `orrmi' -- `orrmi r1,r1,r0,lsr ip'
> > | arch/arm/lib/_ashldi3.S:26: Error: operand 1 should be an integer register -- `mov r0,r0,lsl r2'
> > | arch/arm/lib/_ashldi3.S:27: Error: operand 1 should be an integer register -- `mov pc,lr'
> >
> > This should be fairly easy to fix by
> >  defaulting CONFIG_USE_PRIVATE_LIBGCC to
> >
> > The other 5 failures are snow, smdk5250, peach-pi, smdk5420, and
> > peach-pit, all of which show the same error:
> >
> >> arch/arm/lib/lib.a(div0.o): In function `__div0':
> >> arch/arm/lib/div0.c:13: undefined reference to `hang'
> >> make[2]: *** [spl/u-boot-spl] Error 1
> >> make[1]: *** [spl/u-boot-spl] Error 2
> >
> > That one is be a dependency on hang(). This function... hangs out... in
> > lib/hang.c, which according to lib/Makefile should be included in any
> > build, SPL or otherwise; but it appears lib/ is not built at all for
> > SPL, at least for these five targets.
> >
> > Masahiro, can you have a look at e.g. snow (arm) and ls2085ardb
> > (aarch64) and see if you can update your patch to make sure these two
> > targets build? The other 13 should follow then.
> 
> OK.
> I will take a look.

Ok -- don't rush, though. Seeing as there are contrary opinions on
whether we should use a private libgcc or not, I won't decide on
committing the patch right away.

> -- 
> Best Regards
> Masahiro Yamada

Amicalement,
-- 
Albert.