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* [PATCH 2/8] Documentation/Makefile: conditionally include ../GIT-VERSION-FILE
@ 2020-11-05 21:03 Ramsay Jones
  2020-11-05 21:52 ` Junio C Hamano
  2020-11-06 18:18 ` Jeff King
  0 siblings, 2 replies; 7+ messages in thread
From: Ramsay Jones @ 2020-11-05 21:03 UTC (permalink / raw)
  To: GIT Mailing-list; +Cc: Junio C Hamano


The 'clean' target is still noticeably slow on cygwin, despite the
substantial improvement made by the previous patch. For example, the
second invocation of 'make clean' below:

  $ make clean >/dev/null 2>&1
  $ make clean
  ...
  make[1]: Entering directory '/home/ramsay/git/Documentation'
  make[2]: Entering directory '/home/ramsay/git'
  make[2]: 'GIT-VERSION-FILE' is up to date.
  make[2]: Leaving directory '/home/ramsay/git'
  ...
  $

has been timed at 12.364s on my laptop (on old core i5-4200M @ 2.50GHz,
8GB RAM, 1TB HDD).

Notice that the 'clean' target is making a nested call to the parent
Makefile to ensure that the GIT-VERSION-FILE is up-to-date (prior to
the previous patch, there would have been _two_ such invocations).
This is to ensure that the $(GIT_VERSION) make variable is set, once
that file had been included.  However, the 'clean' target does not use
the $(GIT_VERSION) variable, so this is wasted effort.

In order to eliminate such wasted effort, use the value of the internal
$(MAKECMDGOALS) variable to only '-include ../GIT-VERSION-FILE' when the
target is not 'clean'. (This drops the time down to 10.361s, on my laptop,
giving an improvement of 16.20%).

Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
---
 Documentation/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 652d57a1b6..5c680024eb 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -272,7 +272,9 @@ install-html: html
 ../GIT-VERSION-FILE: FORCE
 	$(QUIET_SUBDIR0)../ $(QUIET_SUBDIR1) GIT-VERSION-FILE
 
+ifneq ($(MAKECMDGOALS),clean)
 -include ../GIT-VERSION-FILE
+endif
 
 #
 # Determine "include::" file references in asciidoc files.
-- 
2.29.0

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2020-11-06 21:43 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-11-05 21:03 [PATCH 2/8] Documentation/Makefile: conditionally include ../GIT-VERSION-FILE Ramsay Jones
2020-11-05 21:52 ` Junio C Hamano
2020-11-06  1:30   ` Ramsay Jones
2020-11-06 18:18 ` Jeff King
2020-11-06 19:38   ` Ramsay Jones
2020-11-06 20:56     ` Jeff King
2020-11-06 21:43     ` Junio C Hamano

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