add feature test macros to non-c99 math tests

[libc-test] / src / math / exp10f.c

diff --git a/src/math/exp10f.c b/src/math/exp10f.c
index 1ca2034..09cafb1 100644 (file)
--- a/src/math/exp10f.c
+++ b/src/math/exp10f.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE 1
 #include <stdint.h>
 #include <stdio.h>
 #include "mtest.h"