linux-kernel - Re: [PATCH 08/36] perf build: Add builtin objects building

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Date:	Wed, 21 Jan 2015 20:12:23 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Alexis Berlemont <alexis.berlemont@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 08/36] perf build: Add builtin objects building

On Wed, Jan 21, 2015 at 11:52:07AM -0700, David Ahern wrote:
> On 1/20/15 9:39 AM, Jiri Olsa wrote:
> >Move the rest of builtin objects (bench and test are
> >already in) building under build framework.
> >
> >Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> >Cc: Alexis Berlemont <alexis.berlemont@...il.com>
> >Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> >Cc: Borislav Petkov <bp@...en8.de>
> >Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> >Cc: David Ahern <dsahern@...il.com>
> >Cc: Frederic Weisbecker <fweisbec@...il.com>
> >Cc: Ingo Molnar <mingo@...nel.org>
> >Cc: Namhyung Kim <namhyung@...nel.org>
> >Cc: Paul Mackerras <paulus@...ba.org>
> >Cc: Peter Zijlstra <peterz@...radead.org>
> >Cc: Stephane Eranian <eranian@...gle.com>
> >---
> >  tools/perf/Build           | 29 +++++++++++++++++++++++++++++
> >  tools/perf/Makefile.perf   | 35 -----------------------------------
> >  tools/perf/config/Makefile |  4 ++++
> >  3 files changed, 33 insertions(+), 35 deletions(-)
> 
> This one fails to build:
> 
> $ git --no-pager log --oneline -1
> cd2a9b144028 perf build: Add builtin objects building
> 
> $ make O=/tmp/junk
> ...
> builtin-help.c:10:25: fatal error: common-cmds.h: No such file or directory
> compilation terminated.
>   CC       /tmp/junk/fs/fs.o
>   CC       /tmp/junk/builtin-script.o
>   CC       /tmp/junk/builtin-kmem.o
>   CC       /tmp/junk/perf-read-vdso32
>   CC       /tmp/junk/ui/gtk/browser.o
>   CC       /tmp/junk/fd/array.o
>   CC       /tmp/junk/ui/gtk/hists.o
>   CC       /tmp/junk/builtin-lock.o
> make[2]: *** [/tmp/junk/builtin-help.o] Error 1
> make[2]: *** Waiting for unfinished jobs....

hum I can't reproduce, but I can see why

on the commit you mentioned there're foolowing dependencies:

	$(PERF_IN): FORCE
		@$(MAKE) $(build)=perf

	$(OUTPUT)perf.o: perf.c $(OUTPUT)common-cmds.h $(OUTPUT)PERF-CFLAGS
		$(QUIET_CC)$(CC) -include $(OUTPUT)PERF-VERSION-FILE \
			'-DPERF_HTML_PATH="$(htmldir_SQ)"' \
			$(CFLAGS) -c $(filter %.c,$^) -o $@

	$(OUTPUT)perf: $(OUTPUT)perf.o $(BUILTIN_OBJS) $(PERFLIBS) $(PERF_IN)
		$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(OUTPUT)perf.o \
		       $(BUILTIN_OBJS) $(PERF_IN) $(LIBS) -o $@


so $(OUTPUT)common-cmds.h gets build only for perf.o, while
it's needed before we dive in to $(PERF_IN) target..

this get's fixed later on within commit:
  a07488a79e78 perf build: Add perf.o object building

where we have:
	$(PERF_IN): $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h FORCE
		$(Q)$(MAKE) $(build)=perf


I'll propagate the $(OUTPUT)common-cmds.h dependency to commit
  cd2a9b144028 perf build: Add builtin objects building

like attached change

thanks for testing,
jirka


---
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index b0df3ec91104..061289d25fa8 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -550,7 +550,7 @@ PERF_IN := $(OUTPUT)perf-in.o
 export srctree OUTPUT RM CC LD AR CFLAGS V
 build := -f $(srctree)/tools/build/Makefile.build dir=. obj
 
-$(PERF_IN): FORCE
+$(PERF_IN): FORCE $(OUTPUT)common-cmds.h
 	@$(MAKE) $(build)=perf
 
 $(OUTPUT)perf.o: perf.c $(OUTPUT)common-cmds.h $(OUTPUT)PERF-CFLAGS
--
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