File 0005-S390-Name-invisible-registers-with-the-empty-string-.patch of Package gdb.783

Part of fate#318039

From 87de11c05253566abb04479a4842cc934d0c822e Mon Sep 17 00:00:00 2001
From: Andreas Arnez <arnez@linux.vnet.ibm.com>
Date: Wed, 4 Mar 2015 10:40:41 +0100
Subject: [PATCH] S390: Name "invisible" registers with the empty string
 instead of NULL

When adding vector register support to GDB, s390_register_name() was
added to suppress the right halves of the first 16 vector registers.
However, that function returned NULL instead of an empty string in such
a case.  This leads to an incomplete list of registers returned by
"complete info registers ", because completion stops at the first NULL
return value from user_reg_map_regnum_to_name().

gdb/ChangeLog:

	* s390-linux-tdep.c (s390_register_name): Return empty string
	instead of NULL for registers that shouldn't be visible.
---
 gdb/ChangeLog         | 5 +++++
 gdb/s390-linux-tdep.c | 6 +++---
 2 files changed, 8 insertions(+), 3 deletions(-)

Index: gdb-7.9.1/gdb/s390-linux-tdep.c
===================================================================
--- gdb-7.9.1.orig/gdb/s390-linux-tdep.c	2015-07-10 16:18:36.000000000 +0200
+++ gdb-7.9.1/gdb/s390-linux-tdep.c	2015-07-10 16:19:20.000000000 +0200
@@ -263,15 +263,15 @@ regnum_is_vxr_full (struct gdbarch_tdep
 	  && regnum <= tdep->v0_full_regnum + 15);
 }
 
-/* Return the name of register REGNO.  Return NULL for registers that
-   shouldn't be visible.  */
+/* Return the name of register REGNO.  Return the empty string for
+   registers that shouldn't be visible.  */
 
 static const char *
 s390_register_name (struct gdbarch *gdbarch, int regnum)
 {
   if (regnum >= S390_V0_LOWER_REGNUM
       && regnum <= S390_V15_LOWER_REGNUM)
-    return NULL;
+    return "";
   return tdesc_register_name (gdbarch, regnum);
 }