From 2c4f313a7e62c7e559a469d4af4c3d03c49afa43 Mon Sep 17 00:00:00 2001
From: Doug Goldstein <cardoe@cardoe.com>
Date: Wed, 2 Dec 2015 15:22:56 +0100
Subject: [PATCH] xen/build: disable default built-in rules and variables

Disable the built-in rules and variables from GNU make to improve
build performance and avoid awkward corner cases with the built-in
rules. Currently none of the implicit rules are used but this is helpful
to do when developing changes to the build system.

Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
 xen/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/Makefile b/xen/Makefile
index fa9cf0a62b..3a1de99532 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -15,6 +15,9 @@ export XEN_BUILD_HOST	?= $(shell hostname)
 export BASEDIR := $(CURDIR)
 export XEN_ROOT := $(BASEDIR)/..
 
+# Do not use make's built-in rules and variables
+MAKEFLAGS += -rR
+
 EFI_MOUNTPOINT ?= $(BOOT_DIR)/efi
 
 .PHONY: default
-- 
2.30.2