linux-kernel - Re: [PATCH 2/2] perf: unwinding: use the per-feature check flags

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Date:	Mon, 9 Dec 2013 19:15:47 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Jean Pihet <jean.pihet@...aro.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo <acme@...stprotocols.net>,
	Will Deacon <will.deacon@....com>,
	Patch Tracking <patches@...aro.org>
Subject: Re: [PATCH 2/2] perf: unwinding: use the per-feature check flags

On Mon, Dec 09, 2013 at 07:02:02PM +0100, Jean Pihet wrote:
> Hi Jiri,
> 
> On 9 December 2013 18:17, Jiri Olsa <jolsa@...hat.com> wrote:
> > On Sat, Dec 07, 2013 at 11:17:41AM +0100, Jean Pihet wrote:
> >> Use the per-feature check flags for the unwinding feature in order
> >> to correctly compile the libunwind and libunwind-debug-frame feature
> >> checks.
> >>
> >> Tested on x86_64, ARMv7 and ARMv8 with and without LIBUNWIND_DIR set
> >> in 'make -C tools/perf'
> >>
> >> Signed-off-by: Jean Pihet <jean.pihet@...aro.org>
> >> Cc: Jiri Olsa <jolsa@...hat.com>
> >
> > SNIP
> >
> >> +BUILD = $(CC) $(CFLAGS) -o $(OUTPUT)$@ $@.c $(LDFLAGS)
> >>
> >>  ###############################
> >>
> >>  test-all:
> >> -     $(BUILD) -Werror -fstack-protector -fstack-protector-all -O2 -Werror -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma $(LIBUNWIND_LIBS) -lelf -laudit -I/usr/include/slang -lslang $(shell pkg-config --libs --cflags gtk+-2.0 2>/dev/null) $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl
> >> +     $(BUILD) -Werror -fstack-protector -fstack-protector-all -O2 -Werror -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lelf -laudit -I/usr/include/slang -lslang $(shell pkg-config --libs --cflags gtk+-2.0 2>/dev/null) $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl
> >
> > hum, the test-all build command should have every possible flags we use, right?
> > including LIBUNWIND_CFLAGS, LIBUNWIND_LDFLAGS
> Oh yes you are right. I am overlooked the test-all feature (which
> never builds on my modest embedded systems).
> $(LIBUNWIND_LIBS) should be replaced by $(LIBUNWIND_CFLAGS)
> $(LIBUNWIND_LDFLAGS), is that a reasonable approach?
> 
> >
> > also, this patch no longer applies on acme's perf/core
> I am using a recent mainline (3.12-rc2).
> 
> Let me correct the patch on acme's perf/core. Is that OK?

yep, thats the best practise 

jirka
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