linux-kernel - Re: [PATCH 05/11] perf data: Add tracepoint events fields CTF conversion support

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Date:	Mon, 9 Mar 2015 20:28:45 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	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 05/11] perf data: Add tracepoint events fields CTF
 conversion support

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:
> > Doesn't work as well...
> > 
> > :-\
> > 
> > Will try debugging...
> 
> So I tried checkout out before Ingo's changes to libbabeltrace detection, i.e.:
> 
> [acme@zoo linux]$ git checkout -b ttmp 9a75606ca06d94aab1ed0dbe96935e3f89dfb81c
> 
> And it works:

So it seems its due to the -Werror
 
> [acme@zoo linux]$ git bisect bad
> b49f1a4be701c2386ccc7496dc8442cf26424d5c is the first bad commit
> commit b49f1a4be701c2386ccc7496dc8442cf26424d5c
> Author: Ingo Molnar <mingo@...nel.org>
> Date:   Sat Feb 28 10:16:27 2015 +0100
> 
>     perf tools: Improve feature test debuggability
>     
>     Certain feature tests fail with link errors:
> 
> --------------------------------------------------------------
> 
> Ran out of time, will continue later/tomorrow.

[acme@zoo linux]$ git diff
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index e2350ada6ccd..d46e0ef45417 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-$1.bin >/tmp/output-$(1) 2>/dev/null && ec
 endef
 
 feature_set = $(eval $(feature_set_code))
[acme@zoo linux]$ cd /home/git/linux/tools/perf/config/feature-checks
[acme@zoo 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
test-libbabeltrace.c: In function ‘main’:
test-libbabeltrace.c:6:2: error: implicit declaration of function ‘bt_ctf_stream_class_get_packet_context_type’ [-Werror=implicit-function-declaration]
  bt_ctf_stream_class_get_packet_context_type((void *) 0);
  ^
cc1: all warnings being treated as errors
[acme@zoo feature-checks]$

[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: * bt_ctf_stream_class_get_packet_context_type: get the stream class' packet
/opt/libbabeltrace/include/babeltrace/ctf-ir/stream-class.h:extern struct bt_ctf_field_type *bt_ctf_stream_class_get_packet_context_type(
[root@zoo ~]#

That seems to be included from the file included in the feature test code :-\

Really ran out of time now...

- Arnaldo
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