fix deadlock race in pthread_once

[musl] / src / math / j1f.c

diff --git a/src/math/j1f.c b/src/math/j1f.c
index 6abde34..58875af 100644 (file)
--- a/src/math/j1f.c
+++ b/src/math/j1f.c
@@ -13,6 +13,7 @@
  * ====================================================
  */
 
+#define _GNU_SOURCE
 #include "libm.h"
 
 static float ponef(float), qonef(float);