[Xen-changelog] [xen-unstable] arm: fix build with gcc 4.7.x

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1340624492 -7200
# Node ID e08cf97e76f0b8fa8ff68050e6108c97ef7d9af4
# Parent  8c70ad9fd221c4e1549579b63ad20d0f8d4ced83
arm: fix build with gcc 4.7.x

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=).

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---


diff -r 8c70ad9fd221 -r e08cf97e76f0 xen/arch/arm/Rules.mk
--- a/xen/arch/arm/Rules.mk     Mon Jun 25 10:18:23 2012 +0100
+++ b/xen/arch/arm/Rules.mk     Mon Jun 25 13:41:32 2012 +0200
@@ -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")

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