[PATCH] Makefile: conditionally include GIT-VERSION-FILE

The 'clean' target is noticeably slow on cygwin, even for a 'do-nothing' invocation of 'make clean'. For example, the second 'make clean' given below:

  $ make clean >/dev/null 2>&1
  $ make clean
  GITGUI_VERSION = 0.21.0.85.g3e5c
  rm -rf git-gui lib/tclIndex po/*.msg
  rm -rf GIT-VERSION-FILE GIT-GUI-VARS
  $

has been timed at 1.934s on my laptop (an old core i5-4200M @ 2.50GHz, 8GB RAM, 1TB HDD).

Notice that the Makefile, as part of processing the 'clean' target, is updating the 'GIT-VERSION-FILE' file. This is to ensure that the $(GITGUI_VERSION) make variable is set, once that file had been included. However, the 'clean' target does not use the $(GITGUI_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 0.676s, on my laptop, giving an improvement of 65.05%).

Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
---

Hi Pratyush,

This is the promised 'separated out' patch to git-gui from the "speed up 'make clean'" series. Note that the speed improvement doesn't appear to be as good 'stand-alone'; it seems to be about 1.3s rather than 1.976s when called as part of the git Makefile. (Also, on Linux, the numbers are 0.091s -> 0.020s for an 78% improvement).

This patch was build on git-gui 'master' branch (@3e5c911) tonight.

Thanks!

ATB, Ramsay Jones

 Makefile | 2 ++
 1 file changed, 2 insertions(+)