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

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Date:	Tue, 10 Dec 2013 11:05:04 +0100
From:	Jean Pihet <jean.pihet@...aro.org>
To:	Jiri Olsa <jolsa@...hat.com>
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

Hi Jiri,

On 10 December 2013 10:57, Jiri Olsa <jolsa@...hat.com> wrote:
> 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?
>
> 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
Yes that is the idea. The per-feature flags are designed for that
purpose. For now I have the fix for libunwind only, cf. here below.
All features should use the flags. There are complex cases though (e.g
perl flags in config/Makefile andconfig/feature-checks)...

My plan is to submit the ix for libunwind first and if ok care about
the other features. Is that OK?

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index d24b4bd..65bc78e 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -56,10 +56,14 @@ else
   endif
   LIBUNWIND_LDFLAGS += $(LIBUNWIND_LIBS)

+  # Set per-feature check compilation flags
   FEATURE_CHECK_CFLAGS-libunwind = $(LIBUNWIND_CFLAGS)
   FEATURE_CHECK_LDFLAGS-libunwind = $(LIBUNWIND_LDFLAGS)
   FEATURE_CHECK_CFLAGS-libunwind-debug-frame = $(LIBUNWIND_CFLAGS)
   FEATURE_CHECK_LDFLAGS-libunwind-debug-frame = $(LIBUNWIND_LDFLAGS)
+  #  and the flags for the test-all case
+  FEATURE_CHECK_CFLAGS-all += $(LIBUNWIND_CFLAGS)
+  FEATURE_CHECK_LDFLAGS-all += $(LIBUNWIND_LDFLAGS)
 endif

 ifeq ($(NO_PERF_REGS),0)


>
> jirka

Thx,
Jean
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