perf tools: Do not put a variable sized type not at the end of a struct

As this is a GNU extension and while harmless in this case, we can do
the same thing in a more clearer way by using an existing thread_map
constructor.

With this we avoid this while compiling with clang:

  util/parse-events.c:2024:21: error: field 'map' with variable sized type 'struct thread_map' not at the end of a struct or class is a GNU extension
        [-Werror,-Wgnu-variable-sized-type-not-at-end]
                  struct thread_map map;
                                  ^
  1 error generated.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-tqocbplnyyhpst6drgm2u4m3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 07be076..281e44a 100644 (file)
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -2020,17 +2020,14 @@ static bool is_event_supported(u8 type, unsigned config)
                .config = config,
                .disabled = 1,
        };
-       struct {
-               struct thread_map map;
-               int threads[1];
-       } tmap = {
-               .map.nr  = 1,
-               .threads = { 0 },
-       };
+       struct thread_map *tmap = thread_map__new_by_tid(0);
+
+       if (tmap == NULL)
+               return false;
 
        evsel = perf_evsel__new(&attr);
        if (evsel) {
-               open_return = perf_evsel__open(evsel, NULL, &tmap.map);
+               open_return = perf_evsel__open(evsel, NULL, tmap);
                ret = open_return >= 0;
 
                if (open_return == -EACCES) {
@@ -2042,7 +2039,7 @@ static bool is_event_supported(u8 type, unsigned config)
                         *
                         */
                        evsel->attr.exclude_kernel = 1;
-                       ret = perf_evsel__open(evsel, NULL, &tmap.map) >= 0;
+                       ret = perf_evsel__open(evsel, NULL, tmap) >= 0;
                }
                perf_evsel__delete(evsel);
        }