1 files changed, 14 insertions, 3 deletions
diff --git a/winsup/mingw/mingwex/math/sqrtf.c b/winsup/mingw/mingwex/math/sqrtf.c
index 55ca39dbe..b1029cad8 100644
--- a/winsup/mingw/mingwex/math/sqrtf.c
+++ b/winsup/mingw/mingwex/math/sqrtf.c
@@ -1,9 +1,20 @@
 #include <math.h>
+#include <errno.h>
+
+extern float  __QNANF;
 
 float
 sqrtf (float x)
 {
-  float res;
-  asm ("fsqrt" : "=t" (res) : "0" (x));
-  return res;
+  if (x < 0.0F )
+    {
+      errno = EDOM;
+      return __QNANF;
+    }
+  else
+    {
+      float res;
+      asm ("fsqrt" : "=t" (res) : "0" (x));
+      return res;
+    }
 }