linux-kernel - Re: [tip:perf/core] perf tools: Add feature check for libbabeltrace

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Date:	Sat, 28 Feb 2015 10:25:03 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	dsahern@...il.com, jolsa@...nel.org, namhyung@...nel.org,
	acme@...hat.com, hpa@...or.com, fweisbec@...il.com,
	jgalar@...icios.com, linux-kernel@...r.kernel.org,
	wangnan0@...wei.com, bigeasy@...utronix.de, tzanussi@...il.com,
	tglx@...utronix.de, paulus@...ba.org, peterz@...radead.org
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf tools: Add feature check for libbabeltrace


* tip-bot for Jiri Olsa <tipbot@...or.com> wrote:

> Commit-ID:  53d0a57343949b2af9b27229db534b98e5a0c4d0
> Gitweb:     http://git.kernel.org/tip/53d0a57343949b2af9b27229db534b98e5a0c4d0
> Author:     Jiri Olsa <jolsa@...nel.org>
> AuthorDate: Fri, 20 Feb 2015 23:16:58 +0100
> Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
> CommitDate: Wed, 25 Feb 2015 12:42:24 -0300
> 
> perf tools: Add feature check for libbabeltrace
> 
> Adding feature check for babeltrace library [1], which will be used for
> perf data file CTF [2] conversion in following patches.

So this doesn't work on recent Ubuntu systems:

...                 libbabeltrace: [ OFF ]

triton:~/tip/tools/perf/config/feature-checks> make 
test-libbabeltrace.bin
gcc -MD  -Wall -Werror -o test-libbabeltrace.bin test-libbabeltrace.c  
# -lbabeltrace provided by 
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
Makefile:140: recipe for target 'test-libbabeltrace.bin' failed

I have all the requirements, libbabeltrace-ctf-dev and 
libbabeltrace-dev installed, yet the writer.h file:

-rw-r--r-- 1 root root 5283 Oct  7 14:44 /usr/include/babeltrace/ctf-writer/writer.h

does not include a prototype for 
bt_ctf_stream_class_get_packet_context_type().

If Ubuntu's writer.h is too old then either our API use should match 
the ones available:

triton:~/tip/tools/perf/config/feature-checks> grep extern 
/usr/include/babeltrace/ctf-writer/writer.h 
extern "C" {
extern struct bt_ctf_writer *bt_ctf_writer_create(const char *path);
extern struct bt_ctf_stream *bt_ctf_writer_create_stream(
extern int bt_ctf_writer_add_environment_field(struct bt_ctf_writer *writer,
extern int bt_ctf_writer_add_clock(struct bt_ctf_writer *writer,
extern char *bt_ctf_writer_get_metadata_string(struct bt_ctf_writer *writer);
extern void bt_ctf_writer_flush_metadata(struct bt_ctf_writer *writer);
extern int bt_ctf_writer_set_byte_order(struct bt_ctf_writer *writer,
extern void bt_ctf_writer_get(struct bt_ctf_writer *writer);
extern void bt_ctf_writer_put(struct bt_ctf_writer *writer);

or CTF support should be removed from the default set of perf 
features, because right now it blocks the 'all' build speedup.

Thanks,

	Ingo
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