$NetBSD: patch-xen_arch_x86_Makefile,v 1.1 2021/04/18 12:31:26 bouyer Exp $

also filter out flags added by pkgsrc

--- xen/arch/x86/Makefile.orig	2020-12-11 18:09:56.686501836 +0100
+++ xen/arch/x86/Makefile	2020-12-11 18:10:47.737620837 +0100
@@ -252,7 +252,7 @@
 
 efi.lds: AFLAGS-y += -DEFI
 xen.lds efi.lds: xen.lds.S
-	$(CPP) -P $(filter-out -Wa$(comma)%,$(a_flags)) -MQ $@ -o $@ $<
+	$(CPP) -P $(filter-out -Wa$(comma)% -g3,$(a_flags)) -MQ $@ -o $@ $<
 
 boot/mkelf32: boot/mkelf32.c
 	$(HOSTCC) $(HOSTCFLAGS) -o $@ $<