$NetBSD: patch-xen_Makefile,v 1.1 2023/11/21 11:38:26 bouyer Exp $

--- xen/Makefile.orig	2023-10-06 19:17:42.000000000 +0200
+++ xen/Makefile	2023-10-10 16:04:53.552602218 +0200
@@ -260,7 +260,7 @@
 
 # Copy CFLAGS generated by "Config.mk" so they can be reused later without
 # reparsing Config.mk by e.g. arch/x86/boot/.
-export XEN_TREEWIDE_CFLAGS := $(CFLAGS)
+export XEN_TREEWIDE_CFLAGS :=  $(EXTRA_CFLAGS) $(CFLAGS)
 
 # CLANG_FLAGS needs to be calculated before calling Kconfig
 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)