diff --git a/libgloss/ChangeLog b/libgloss/ChangeLog
index f06bc7c0b..b78f12ed6 100644
--- a/libgloss/ChangeLog
+++ b/libgloss/ChangeLog
@@ -1,3 +1,7 @@
+2005-08-02  Shaun Jackman  <sjackman@gmail.com>
+
+        * libgloss/arm/libcfunc.c (isatty): New function.
+
 2005-08-02  Shaun Jackman  <sjackman@gmail.com>
 
         * libgloss/arm/syscalls.c (_exit): Call _kill with the second
diff --git a/libgloss/arm/libcfunc.c b/libgloss/arm/libcfunc.c
index f684c2526..26f563308 100644
--- a/libgloss/arm/libcfunc.c
+++ b/libgloss/arm/libcfunc.c
@@ -43,6 +43,16 @@ alarm (unsigned seconds)
 	return 0;
 }
 
+int _isatty(int fildes);
+int __attribute__((weak))
+isatty(int fildes)
+{
+	/* GDB does not yet support the IsTTY SWI that _isatty
+	 * calls, so always return true for now. */
+	(void)fildes;
+	return 1;
+}
+
 int __attribute__((weak))
 pause (void)
 {