linux-kernel - Re: [PATCH] perf tools: Speed up git-version test on re-make

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Date:	Wed, 02 Oct 2013 15:47:19 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Ahern <dsahern@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] perf tools: Speed up git-version test on re-make

On Tue, 1 Oct 2013 16:46:18 +0200, Ingo Molnar wrote:

[SNIP]
>  
> -$(OUTPUT)PERF-VERSION-FILE: .FORCE-PERF-VERSION-FILE
> +$(OUTPUT)PERF-VERSION-FILE: ../../.git/HEAD
>  	@$(SHELL_PATH) util/PERF-VERSION-GEN $(OUTPUT)
> +	@touch $(OUTPUT)PERF-VERSION-FILE
>  
>  CC = $(CROSS_COMPILE)gcc
>  AR = $(CROSS_COMPILE)ar
> @@ -813,7 +814,17 @@ clean: $(LIBTRACEEVENT)-clean $(LIBLK)-c
>  	$(RM) $(OUTPUT)util/*-flex*
>  	$(python-clean)
>  
> +#
> +# Trick: if ../../.git does not exist - we are building out of tree for example,
> +# then force version regeneration:
> +#
> +ifeq ($(wildcard ../../.git/HEAD),) 
> +    GIT-HEAD-PHONY = ../../.git/HEAD
> +else 
> +    GIT-HEAD-PHONY =
> +endif
> +
>  .PHONY: all install clean strip $(LIBTRACEEVENT) $(LIBLK)
>  .PHONY: shell_compatibility_test please_set_SHELL_PATH_to_a_more_modern_shell
> -.PHONY: .FORCE-PERF-VERSION-FILE TAGS tags cscope .FORCE-PERF-CFLAGS
> +.PHONY: $(GIT-HEAD-PHONY) TAGS tags cscope .FORCE-PERF-CFLAGS
>  

I found an unrelated bug.  When I tried to build perf out of tree after
'make perf-targz-src-pkg' it cannot get any version number.

      GEN common-cmds.h
      * new build flags or prefix
  make[1]: *** No rule to make target `kernelversion'.  Stop.
  PERF_VERSION = 
      ...
      AR libperf.a
      LINK perf

  $ ./perf --version
  perf version 


It looks like we should save and pass the result of 'make kernelversion'
to the tarball.

Thanks,
Namhyung
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