Merge pull request #1102 from palmtenor/fixwarning

Fix compiler warning on redefined Macro

src/cc/BPFTable.cc

@@ -136,6 +136,7 @@ StatusTuple BPFPerfBuffer::close_all_cpu() {
   std::string errors;
   bool has_error = false;
 
+  if (epfd_ >= 0) {
     int close_res = close(epfd_);
     epfd_ = -1;
     ep_events_.reset();
@@ -143,6 +144,7 @@ StatusTuple BPFPerfBuffer::close_all_cpu() {
       has_error = true;
       errors += std::string(std::strerror(errno)) + "\n";
     }
+  }
 
   std::vector<int> opened_cpus;
   for (auto it : cpu_readers_)

src/cc/bcc_proc.c

@@ -13,7 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>

src/cc/perf_reader.c

@@ -244,7 +244,7 @@ void perf_reader_event_read(struct perf_reader *reader) {
       if (reader->lost_cb) {
         reader->lost_cb(lost);
       } else {
-        fprintf(stderr, "Possibly lost " PRIu64 " samples\n", lost);
+        fprintf(stderr, "Possibly lost %" PRIu64 " samples\n", lost);
       }
     } else if (e->type == PERF_RECORD_SAMPLE) {
       if (reader->type == PERF_TYPE_TRACEPOINT)