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[Xen-devel] [PATCH] 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@xxxxxxxxxx>
 xen/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/Makefile b/xen/Makefile
index fa9cf0a..3a1de99 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
 .PHONY: default

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