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-rw-r--r--math/s_nexttowardf.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/math/s_nexttowardf.c b/math/s_nexttowardf.c
index 06350d47bf..30cd81b454 100644
--- a/math/s_nexttowardf.c
+++ b/math/s_nexttowardf.c
@@ -20,6 +20,7 @@
  *   Special cases:
  */
 
+#include <errno.h>
 #include <math.h>
 #include <math_private.h>
 #include <float.h>
@@ -61,10 +62,12 @@ float __nexttowardf(float x, long double y)
 	if(hy>=0x7f800000) {
 	  float u = x+x;			/* overflow  */
 	  math_force_eval (u);
+	  __set_errno (ERANGE);
 	}
 	if(hy<0x00800000) {
 	    float u = x*x;			/* underflow */
 	    math_force_eval (u);		/* raise underflow flag */
+	    __set_errno (ERANGE);
 	}
 	SET_FLOAT_WORD(x,hx);
 	return x;