[tip: perf/core] perf report: Add warning when libunwind not compiled in

[tip-bot2 for Jin Yao]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     800d3f561659b5436f8c57e7c26dd1f6928b5615
Gitweb:        https://git.kernel.org/tip/800d3f561659b5436f8c57e7c26dd1f6928b5615
Author:        Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
AuthorDate:    Fri, 11 Oct 2019 10:21:22 +08:00
Committer:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Tue, 15 Oct 2019 08:36:22 -03:00

perf report: Add warning when libunwind not compiled in

We received a user report that call-graph DWARF mode was enabled in
'perf record' but 'perf report' didn't unwind the callstack correctly.
The reason was, libunwind was not compiled in.

We can use 'perf -vv' to check the compiled libraries but it would be
valuable to report a warning to user directly (especially valuable for
a perf newbie).

The warning is:

Warning:
Please install libunwind development packages during the perf build.

Both TUI and stdio are supported.

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20191011022122.26369-1-yao.jin@xxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-report.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index aae0e57..7accaf8 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -399,6 +399,13 @@ static int report__setup_sample_type(struct report *rep)
 				PERF_SAMPLE_BRANCH_ANY))
 		rep->nonany_branch_mode = true;
 
+#ifndef HAVE_LIBUNWIND_SUPPORT
+	if (dwarf_callchain_users) {
+		ui__warning("Please install libunwind development packages "
+			    "during the perf build.\n");
+	}
+#endif
+
 	return 0;
 }