* [PATCH] build: disable default built-in rules and variables
@ 2015-12-01 21:19 Doug Goldstein
2015-12-01 21:54 ` Andrew Cooper
0 siblings, 1 reply; 2+ messages in thread
From: Doug Goldstein @ 2015-12-01 21:19 UTC (permalink / raw)
To: xen-devel
Cc: Keir Fraser, Ian Campbell, Tim Deegan, Doug Goldstein,
Jan Beulich, Ian Jackson
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>
---
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
+MAKEFLAGS += -rR
+
EFI_MOUNTPOINT ?= $(BOOT_DIR)/efi
.PHONY: default
--
2.4.10
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] build: disable default built-in rules and variables
2015-12-01 21:19 [PATCH] build: disable default built-in rules and variables Doug Goldstein
@ 2015-12-01 21:54 ` Andrew Cooper
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Cooper @ 2015-12-01 21:54 UTC (permalink / raw)
To: Doug Goldstein, xen-devel
Cc: Ian Jackson, Tim Deegan, Keir Fraser, Ian Campbell, Jan Beulich
On 01/12/2015 21:19, Doug Goldstein wrote:
> 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>
Trying this out, it reliably drops Xen's build time from ~58s to ~52s on
the dev box I have to hand.
~Andrew
^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-12-01 21:19 [PATCH] build: disable default built-in rules and variables Doug Goldstein
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