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Date: Tue, 10 Dec 2013 10:57:23 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: Jean Pihet <jean.pihet@linaro.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>,
        Ingo Molnar <mingo@kernel.org>, Arnaldo <acme@ghostprotocols.net>,
        Will Deacon <will.deacon@arm.com>, Patch Tracking <patches@linaro.org>
Subject: Re: [PATCH 2/2] perf: unwinding: use the per-feature check flags
Message-ID: <20131210095723.GB2352@krava.brq.redhat.com>
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On Mon, Dec 09, 2013 at 07:02:02PM +0100, Jean Pihet wrote:
> Hi Jiri,
> 
> On 9 December 2013 18:17, Jiri Olsa <jolsa@redhat.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@linaro.org>
> >> Cc: Jiri Olsa <jolsa@redhat.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?

hum, I'm just dealing with same issue for new libdw feature.. ;-)

I was wondering we could just setup:
  FEATURE_CHECK_CFLAGS-all
  FEATURE_CHECK_LDFLAGS-all

automatically from all defined FEATURE_CHECK_(C|LD)FLAGS-*
just a thought.. haven't tried it yet

jirka