[U-Boot] [PATCH] PPC: fix "Warning: FOO uses hard float, BAR uses soft float".

[Anatolij Gustschin]

Hi Wolfgang,

On Thu, 22 Dec 2011 15:29:41 +0100
Wolfgang Denk <wd at denx.de> wrote:

> It appears that with recent versions of GCC the explicit
> "-mhard-float" command line option takes precedence over the
> ``asm(".gnu_attribute 4, 2");'' in the source file, so this no longer
> helps to avoid the warnings we get when linking code that uses FP
> instructions with other code that was built using soft-float.
> 
> We can remove the ".gnu_attribute" (which appears to carry no other
> information, at least so far) from the object files, but we also have
> to make sure we don't pull in the __gcc_qsub() and __gcc_qmul()
> functions from the standard libgcc, as these would again "infect" our
> linking.  We copy this code from:
> 	gcc-4.2.2/gcc/config/rs6000/darwin-ldouble.c
> This old version was chosen because it was still available under a
> compatible license (GCC v2+).   The file was stripped down to the
> needed parts, and reformatted so it passes checkpatch with only one
> warning (do not add new typedefs).
> 
> Signed-off-by: Wolfgang Denk <wd at denx.de>
> Cc: Kumar Gala <galak at kernel.crashing.org>
> Cc: Stefan Roese <sr at denx.de>
> Cc: Andy Fleming <afleming at gmail.com>
> Cc: Kim Phillips <kim.phillips at freescale.com>

Tested on TQM5200.

Tested-by: Anatolij Gustschin <agust at denx.de>

Anatolij