perf tools: Print warning when HAVE_DEBUGINFOD_SUPPORT is not set and user...

perf tools: Print warning when HAVE_DEBUGINFOD_SUPPORT is not set and user tries to use debuginfod support

When one requests debuginfod, either via --debuginfod option, or with a
perf-config value, complain when perf is not built with it.
Signed-off-by: Martin Liška <mliska@suse.cz>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lore.kernel.org/lkml/35bae747-3951-dc3d-a66b-abf4cebcd9cb@suse.czSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/util.c

@@ -430,6 +430,11 @@ void perf_debuginfod_setup(struct perf_debuginfod *di)
 		setenv("DEBUGINFOD_URLS", di->urls, 1);
 
 	pr_debug("DEBUGINFOD_URLS=%s\n", getenv("DEBUGINFOD_URLS"));
+
+#ifndef HAVE_DEBUGINFOD_SUPPORT
+	if (di->set)
+		pr_warning("WARNING: debuginfod support requested, but perf is not built with it\n");
+#endif
 }
 
 /*