perf report: Add warning when libunwind not compiled in

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / tools / perf / builtin-report.c

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index f256fac..0f7ebac 100644 (file)
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -285,6 +285,13 @@ 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;
 }