[PATCH v2] x86/boot: Optimise 32 bit C source code

[Frediano Ziglio <frediano.ziglio@xxxxxxxxx>]

The various filters are removing all optimisations.
No need to have all optimisations turned off.

Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
---
 xen/arch/x86/boot/Makefile | 1 +
 1 file changed, 1 insertion(+)
---
Changes since v1
- reuse optimization level from XEN_CFLAGS.

diff --git a/xen/arch/x86/boot/Makefile b/xen/arch/x86/boot/Makefile
index 8f5bbff0cc..8352ce023b 100644
--- a/xen/arch/x86/boot/Makefile
+++ b/xen/arch/x86/boot/Makefile
@@ -16,6 +16,7 @@ $(call 
cc-options-add,CFLAGS_x86_32,CC,$(EMBEDDED_EXTRA_CFLAGS))
 CFLAGS_x86_32 += -Werror -fno-builtin -g0 -msoft-float -mregparm=3
 CFLAGS_x86_32 += -nostdinc -include $(filter 
%/include/xen/config.h,$(XEN_CFLAGS))
 CFLAGS_x86_32 += $(filter -I%,$(XEN_CFLAGS))
+CFLAGS_x86_32 += $(filter -O%,$(XEN_CFLAGS))
 
 # override for 32bit binaries
 $(head-bin-objs): CFLAGS_stack_boundary :=
-- 
2.34.1