linux-kernel - Re: [PATCH] perf build: Fix libbabeltrace detection

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Date:	Tue, 10 Mar 2015 10:44:00 -0400
From:	Jérémie Galarneau 
	<jeremie.galarneau@...icios.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jeremie Galarneau <jgalar@...icios.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH] perf build: Fix libbabeltrace detection

On Tue, Mar 10, 2015 at 10:11 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> On Tue, Mar 10, 2015 at 11:01:34AM -0300, Arnaldo Carvalho de Melo wrote:
>> Em Tue, Mar 10, 2015 at 01:00:35PM +0100, Jiri Olsa escreveu:
>> > On Mon, Mar 09, 2015 at 08:28:45PM -0300, Arnaldo Carvalho de Melo wrote:
>> > > Em Mon, Mar 09, 2015 at 08:11:19PM -0300, Arnaldo Carvalho de Melo escreveu:
>> > > > Em Mon, Mar 09, 2015 at 06:51:21PM -0300, Arnaldo Carvalho de Melo escreveu:
>> > > [root@zoo ~]# find /opt/libbabeltrace/include/babeltrace/ -type f | xargs grep bt_ctf_stream_class_get_packet_context_type
>> > > /opt/libbabeltrace/include/babeltrace/ctf-ir/stream-class.h:extern struct bt_ctf_field_type *bt_ctf_stream_class_get_packet_context_type(
>>
>> > > That seems to be included from the file included in the feature test code :-\
>> > > Really ran out of time now...
>>
>> > ouch, thanks a lot for debugging.. the reason is indeed the -Werror added by:
>> >   b49f1a4be701 perf tools: Improve feature test debuggability
>>
>> > following patch seems to fix this for me
>> > ---
>> > Following patch added -Werror for feature builds:
>> >   b49f1a4be701 perf tools: Improve feature test debuggability
>>
>> > and broke libbabeltrace feature build, because it was including
>> > wrong header and gcc couldn't find the used symbol definition.
>>
>> > Adding proper header and keeping the old one as it is needed
>> > also (libbabeltrace quirk).
>>
>> > +++ b/tools/perf/config/feature-checks/test-libbabeltrace.c
>> >  #include <babeltrace/ctf-writer/writer.h>
>> > +#include <babeltrace/ctf-ir/stream-class.h>
>>
>> Right, that was the fix I found as well, well, I was trying to include
>> _just_ babeltrace/ctf-ir/stream-class.h, but that is buggy in that it
>> doesn't include the header file with the uint32_t and int64_t types:
>
> yep, thats the 'libbabeltrace quirk' I mentioned in the changelog ;-)
>

Seems I missed that being discussed. Fixed in Babeltrace master as of 48d711aa2.

Jérémie

>>
>> [acme@zoo linux]$ cat /tmp/build/perf/config/feature-checks/make-libbabeltrace
>> make[1]: Entering directory `/home/git/linux/tools/perf/config/feature-checks'
>> gcc -MD -I/opt/libbabeltrace//include -Wall -Werror -o /tmp/build/perf/config/feature-checks/test-libbabeltrace.bin test-libbabeltrace.c -Wl,-z,noexecstack -L/opt/libbabeltrace//lib -lbabeltrace-ctf # -lbabeltrace provided by
>> In file included from test-libbabeltrace.c:2:0:
>> /opt/libbabeltrace//include/babeltrace/ctf-ir/stream-class.h:118:1: error: unknown type name ‘int64_t’
>>  extern int64_t bt_ctf_stream_class_get_id(
>>  ^
>> /opt/libbabeltrace//include/babeltrace/ctf-ir/stream-class.h:134:45: error: unknown type name ‘uint32_t’
>>    struct bt_ctf_stream_class *stream_class, uint32_t id);
>>                                              ^
>> make[1]: *** [test-libbabeltrace.bin] Error 1
>> make[1]: Leaving directory `/home/git/linux/tools/perf/config/feature-checks'
>> [acme@zoo linux]$
>>
>> >
>> >  int main(void)
>> >  {
>> > --
>> > 1.9.3
>>
>> Ah, I found the following patch useful in debugging this, if you're ok with it,
>> I'll put it in my tree with your Acked-by, ok?
>>
>> - Arnaldo
>>
>> [acme@zoo linux]$ git diff tools/perf/config/Makefile
>> diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
>> index e2350ada6ccd..4992c39652e6 100644
>> --- a/tools/perf/config/Makefile
>> +++ b/tools/perf/config/Makefile
>> @@ -184,7 +184,7 @@ endif
>>
>>  feature_check = $(eval $(feature_check_code))
>>  define feature_check_code
>> -  feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C config/feature-checks test-$1.bin >/dev/null 2>/dev/null && echo 1 ||
>> +  feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C config/feature-checks test-$1.bin > $(OUTPUT_FEATURES)make-$(1) 2>&1
>>  endef
>
> ack, that seem usefull.. I always redirected this to '>> /tmp/krava'
> never got enough will to make it nice and generic ;-)
>
> thanks,
> jirka



-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com
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