[U-Boot] [RFC PATCH 1/4] ARM: enable Thumb build

[Tom Rini]

On Mon, Feb 6, 2012 at 4:37 AM, Aneesh V <aneesh at ti.com> wrote:
> Enable Thumb build and ARM-Thumb interworking based on the new
> config flag CONFIG_SYS_THUMB_BUILD
>
> Signed-off-by: Aneesh V <aneesh at ti.com>
[snip]
> -# Explicitly specifiy 32-bit ARM ISA since toolchain default can be -mthumb:
> -PF_CPPFLAGS_ARM := $(call cc-option,-marm,)
> +# Choose between ARM/Thumb instruction sets
> +ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
> +PF_CPPFLAGS_ARM += $(call cc-option, -mthumb -mthumb-interwork, \
> +               -marm -mno-thumb-interwork)
> +else
> +PF_CPPFLAGS_ARM += $(call cc-option, -marm -mno-thumb-interwork)
> +endif

We need the ':=' syntax to evaluate this once rather than for every
file we build.  Same with the rest of the changes here.

-- 
Tom