math: fix expm1f overflow threshold

[musl] / src / math / sincos.c

diff --git a/src/math/sincos.c b/src/math/sincos.c
index 49f8a09..35b2d92 100644 (file)
--- a/src/math/sincos.c
+++ b/src/math/sincos.c
@@ -10,6 +10,7 @@
  * ====================================================
  */
 
+#define _GNU_SOURCE
 #include "libm.h"
 
 void sincos(double x, double *sin, double *cos)