[tip:perf/core] perf data: Add doc when no conversion support compiled

["tip-bot for Geneviève Bastien" <tipbot@zytor.com>]

Commit-ID:  6b7007af728df7258bb60ed73099be3b59b3030e
Gitweb:     http://git.kernel.org/tip/6b7007af728df7258bb60ed73099be3b59b3030e
Author:     Geneviève Bastien <gbastien@versatic.net>
AuthorDate: Thu, 27 Jul 2017 14:12:05 -0400
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 28 Jul 2017 16:30:45 -0300

perf data: Add doc when no conversion support compiled

This adds documentation on the environment variables needed to the
message telling that no conversion support is compiled in.

Committer testing:

  $ make -C tools/perf install
  $ perf data convert --all --to-ctf myctftrace
  No conversion support compiled in. perf should be compiled with environment variables LIBBABELTRACE=1 and LIBBABELTRACE_DIR=/path/to/libbabeltrace/
  $

Signed-off-by: Geneviève Bastien <gbastien@versatic.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Francis Deslauriers <francis.deslauriers@efficios.com>
Cc: Julien Desfossez <jdesfossez@efficios.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170727181205.24843-3-gbastien@versatic.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-data.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-data.c b/tools/perf/builtin-data.c
index 0adb5f8..46cd849 100644
--- a/tools/perf/builtin-data.c
+++ b/tools/perf/builtin-data.c
@@ -69,7 +69,7 @@ static int cmd_data_convert(int argc, const char **argv)
 	};
 
 #ifndef HAVE_LIBBABELTRACE_SUPPORT
-	pr_err("No conversion support compiled in.\n");
+	pr_err("No conversion support compiled in. perf should be compiled with environment variables LIBBABELTRACE=1 and LIBBABELTRACE_DIR=/path/to/libbabeltrace/\n");
 	return -1;
 #endif