make _GNU_SOURCE definitions consistent with luajit, include before f…

…eatures.h

Signed-off-by: Justin Cormack <[email protected]>

gcc-preinclude.h

@@ -2,6 +2,8 @@
 // See: http://www.win.tue.nl/~aeb/linux/misc/gcc-semibug.html
 //      https://rjpower9000.wordpress.com/2012/04/09/fun-with-shared-libraries-version-glibc_2-14-not-found/
 
+#define _GNU_SOURCE 1
+
 #include <features.h>
 
 #ifndef __ASSEMBLER__

src/core/memory.c

@@ -9,7 +9,7 @@
 // virtual addresses (remove the tag bits) and to test addresses for
 // validity (check the tag bits).
 
-#define _GNU_SOURCE
+#define _GNU_SOURCE 1
 
 #include <assert.h>
 #include <fcntl.h>

src/lib/traceprof/traceprof.c

@@ -1,6 +1,6 @@
 // Location where the next instruction pointer value will be stored.
 
-#define _GNU_SOURCE
+#define _GNU_SOURCE 1
 
 #include <assert.h>
 #include <stdio.h>