From ccd62a896ffe3dbd60f3b7570a2b74e4fe030ed6 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Sat, 16 Apr 2016 09:36:32 -0300 Subject: [PATCH] perf trace: Fix build when DWARF unwind isn't available MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The variable is initialized and then conditionally set to a different value, but not used when DWARF unwinding is not available, bummer, write 1000 times: "Run make -C tools/perf build-test"... builtin-trace.c: In function ‘cmd_trace’: builtin-trace.c:3112:6: error: variable ‘max_stack_user_set’ set but not used [-Werror=unused-but-set-variable] bool max_stack_user_set = true; ^ cc1: all warnings being treated as err Fix it by marking it as __maybe_unused. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Milian Wolff Cc: Namhyung Kim Cc: Wang Nan Fixes: 056149932602 ("perf trace: Make --(min,max}-stack imply "--call-graph dwarf"") Link: http://lkml.kernel.org/n/tip-85r40c5hhv6jnmph77l1hgsr@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 026ec0c749b0..0e3c1cecef1b 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -3109,7 +3109,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused) "per thread proc mmap processing timeout in ms"), OPT_END() }; - bool max_stack_user_set = true; + bool __maybe_unused max_stack_user_set = true; bool mmap_pages_user_set = true; const char * const trace_subcommands[] = { "record", NULL }; int err; -- 2.39.2