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

[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.

> Amicalement,
> -- 
> Albert.

Amicalement,
-- 
Albert.