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 11:28:23 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	pi3orama@....com, lizefan@...wei.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

Em Thu, Jan 14, 2016 at 05:56:06PM +0800, Wangnan (F) escreveu:
> 
> 
> On 2016/1/14 17:32, Jiri Olsa wrote:
> >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
> 
> I have strong motivation to avoid polluting source directory.

yeah!
 
> I have different platforms and sometime I want to build them
> (cross-compile) parallelly. I use yocto for this. Yocto appends 'O'
> automatically. This is good for building, but when I use the
> framework for build-test I have to manually adjust the generated
> scripts (and it would be regenerated again in next run) to make it
> work, and also I'm unable to test them in parallel.
> 
> For people who don't care about this, $(O_OPT) is empty so he/she
> still tests without 'O=...' case.
> 
> Thank you.