Re: [PATCH] arm: fix build with gcc 4.7.x

[David Vrabel <david.vrabel@citrix.com>]

On 25/06/12 11:57, Jan Beulich wrote:
> As was already pointed out months ago (see
> http://lists.xen.org/archives/html/xen-devel/2012-02/msg00826.html),
> gcc 4.7.x (imo validly) refuses to take both -mcpu=cortex-a15 and
> -march=armv7-a due to conflicting feature sets causing amibiguity in
> instruction selection. Since the former implies the latter, just use
> the former (and drop the -march=).

Given that we currently use the v7-A envelope model rather than a
Cortex-A15 I think -march=armv7-a is the correct option.

David

> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
> 
> --- a/xen/arch/arm/Rules.mk
> +++ b/xen/arch/arm/Rules.mk
> @@ -24,7 +24,7 @@ ifneq ($(call cc-option,$(CC),-fvisibili
>  CFLAGS += -DGCC_HAS_VISIBILITY_ATTRIBUTE
>  endif
>  
> -CFLAGS += -march=armv7-a -mcpu=cortex-a15 -mfpu=vfpv3 -mfloat-abi=softfp
> +CFLAGS += -mcpu=cortex-a15 -mfpu=vfpv3 -mfloat-abi=softfp
>  
>  # Require GCC v3.4+ (to avoid issues with alignment constraints in Xen headers)
>  check-$(gcc) = $(call cc-ver-check,CC,0x030400,"Xen requires at least gcc-3.4")