ensure _GNU_SOURCE is defined instead of defining it unconditionally

Gabriel Schulhof · Gabriel Schulhof · commit 2d6be5e752e7 · 2020-03-13T14:46:09.000-07:00
diff --git a/src/large_pages/node_large_page.cc b/src/large_pages/node_large_page.cc
@@ -30,7 +30,9 @@
 #include "uv.h"
 
 #if defined(__linux__)
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <link.h>
 #endif
 #include <sys/types.h>
