linux-kernel - Re: [PATCH 2/9] perf build: Pass O option to Makefile.perf in build-test

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Date:	Thu, 14 Jan 2016 10:32:58 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	acme@...nel.org, linux-kernel@...r.kernel.org, pi3orama@....com,
	lizefan@...wei.com, Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 2/9] perf build: Pass O option to Makefile.perf in
 build-test

On Wed, Jan 13, 2016 at 12:17:15PM +0000, Wang Nan wrote:
> Doesn't like tools/perf/Makefile, tools/perf/Makefile.perf obey 'O'
> option when it is passed through cmdline only, because of code in
> tools/scripts/Makefile.include:
> 
>  ifneq ($(O),)
>  ifeq ($(origin O), command line)
>  	...
>  	ABSOLUTE_O := $(shell cd $(O) ; pwd)
>  	OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/)
>  endif
>  endif
> 
> This patch passes 'O' to Makefile.perf through cmdline explicitly
> to make it follow O variable during build-test.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/tests/make | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/tests/make b/tools/perf/tests/make
> index c0ee679..14d7b8d 100644
> --- a/tools/perf/tests/make
> +++ b/tools/perf/tests/make
> @@ -5,7 +5,7 @@ ifeq ($(MAKECMDGOALS),)
>  # no target specified, trigger the whole suite
>  all:
>  	@echo "Testing Makefile";      $(MAKE) -sf tests/make MK=Makefile
> -	@echo "Testing Makefile.perf"; $(MAKE) -sf tests/make MK=Makefile.perf SET_PARALLEL=1
> +	@echo "Testing Makefile.perf"; $(MAKE) -sf tests/make MK=Makefile.perf SET_PARALLEL=1 SET_O=1
>  else
>  # run only specific test over 'Makefile'
>  %:
> @@ -13,6 +13,14 @@ else
>  endif
>  else
>  PERF := .
> +O_OPT :=
> +
> +ifneq ($(O),)
> +  FULL_O := $(shell readlink -f $(O) || echo $(O))
> +  ifeq ($(SET_O),1)
> +    O_OPT := 'O=$(FULL_O)'
> +  endif
> +endif
>  
>  PARALLEL_OPT=
>  ifeq ($(SET_PARALLEL),1)
> @@ -261,7 +269,7 @@ clean := @(cd $(PERF); make -s -f $(MK) clean >/dev/null)
>  $(run):
>  	$(call clean)
>  	@TMP_DEST=$$(mktemp -d); \
> -	cmd="cd $(PERF) && make -f $(MK) $(PARALLEL_OPT) DESTDIR=$$TMP_DEST $($@)"; \
> +	cmd="cd $(PERF) && make -f $(MK) $(PARALLEL_OPT) $(O_OPT) DESTDIR=$$TMP_DEST $($@)"; \

hum, but this set is to test make without O=... so why would you set it?
run_O is the target for O=... tests

thanks,
jirka