http://sourceware.org/ml/gdb-cvs/2012-04/msg00225.html

### src/gdb/ChangeLog	2012/04/27 18:50:35	1.14177
### src/gdb/ChangeLog	2012/04/27 18:55:19	1.14178
## -1,3 +1,10 @@
+2012-04-27  Mark Wielaard  <mjw@redhat.com>
+
+	* dwarf2read.c (dwarf2_get_pc_bounds): Check DW_AT_high_pc form to
+	see whether it is an address or a constant offset from DW_AT_low_pc.
+	(dwarf2_record_block_ranges): Likewise.
+	(read_partial_die): Likewise.
+
 2012-04-26  Mark Wielaard  <mjw@redhat.com>
 
 	* MAINTAINERS (Write After Approval): Add myself to the list.
--- src/gdb/dwarf2read.c	2012/04/26 20:32:30	1.640
+++ src/gdb/dwarf2read.c	2012/04/27 18:55:19	1.641
@@ -6706,17 +6706,23 @@
 		      struct partial_symtab *pst)
 {
   struct attribute *attr;
+  struct attribute *attr_high;
   CORE_ADDR low = 0;
   CORE_ADDR high = 0;
   int ret = 0;
 
-  attr = dwarf2_attr (die, DW_AT_high_pc, cu);
-  if (attr)
+  attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
+  if (attr_high)
     {
-      high = DW_ADDR (attr);
       attr = dwarf2_attr (die, DW_AT_low_pc, cu);
       if (attr)
-	low = DW_ADDR (attr);
+        {
+	  low = DW_ADDR (attr);
+	  if (attr_high->form == DW_FORM_addr)
+	    high = DW_ADDR (attr_high);
+	  else
+	    high = low + DW_UNSND (attr_high);
+	}
       else
 	/* Found high w/o low attribute.  */
 	return 0;
@@ -6864,16 +6870,20 @@
 {
   struct objfile *objfile = cu->objfile;
   struct attribute *attr;
+  struct attribute *attr_high;
 
-  attr = dwarf2_attr (die, DW_AT_high_pc, cu);
-  if (attr)
+  attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
+  if (attr_high)
     {
-      CORE_ADDR high = DW_ADDR (attr);
-
       attr = dwarf2_attr (die, DW_AT_low_pc, cu);
       if (attr)
         {
           CORE_ADDR low = DW_ADDR (attr);
+	  CORE_ADDR high;
+	  if (attr_high->form == DW_FORM_addr)
+	    high = DW_ADDR (attr_high);
+	  else
+	    high = low + DW_UNSND (attr_high);
 
           record_block_range (block, baseaddr + low, baseaddr + high - 1);
         }
@@ -9925,6 +9935,7 @@
   struct attribute attr;
   int has_low_pc_attr = 0;
   int has_high_pc_attr = 0;
+  int high_pc_relative = 0;
 
   memset (part_die, 0, sizeof (struct partial_die_info));
 
@@ -9981,7 +9992,13 @@
 	  break;
 	case DW_AT_high_pc:
 	  has_high_pc_attr = 1;
-	  part_die->highpc = DW_ADDR (&attr);
+	  if (attr.form == DW_FORM_addr)
+	    part_die->highpc = DW_ADDR (&attr);
+	  else
+	    {
+	      high_pc_relative = 1;
+	      part_die->highpc = DW_UNSND (&attr);
+	    }
 	  break;
 	case DW_AT_location:
           /* Support the .debug_loc offsets.  */
@@ -10061,6 +10078,9 @@
 	}
     }
 
+  if (high_pc_relative)
+    part_die->highpc += part_die->lowpc;
+
   if (has_low_pc_attr && has_high_pc_attr)
     {
       /* When using the GNU linker, .gnu.linkonce. sections are used to