From 6c83ed5236196bc958718f86d547551f25592659 Mon Sep 17 00:00:00 2001
From: Tom Tromey <tromey@redhat.com>
Date: Wed, 20 Jul 2011 15:13:49 +0000
Subject: [PATCH] 	* dwarf2read.c (process_enumeration_scope): Do not
 call new_symbol 	in some declaration-only cases.

---
 gdb/ChangeLog    |  5 +++++
 gdb/dwarf2read.c | 26 ++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ca053d27f4..aa5bdf10c5 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2011-07-20  Tom Tromey  <tromey@redhat.com>
 
+	* dwarf2read.c (process_enumeration_scope): Do not call new_symbol
+	in some declaration-only cases.
+
+2011-07-18  Tom Tromey  <tromey@redhat.com>
+
 	PR symtab/12984:
 	* dwarf2read.c (dwarf2_section_info_def): New typedef.
 	(struct dwarf2_per_objfile) <types>: Change to a VEC.
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index a373b09c62..64325cbc2f 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -1207,6 +1207,11 @@ static struct die_info *follow_die_sig (struct die_info *,
 					struct attribute *,
 					struct dwarf2_cu **);
 
+static struct signatured_type *lookup_signatured_type_at_offset
+    (struct objfile *objfile,
+     struct dwarf2_section_info *section,
+     unsigned int offset);
+
 static void read_signatured_type_at_offset (struct objfile *objfile,
 					    struct dwarf2_section_info *sect,
 					    unsigned int offset);
@@ -7730,6 +7735,27 @@ process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
 	TYPE_UNSIGNED (this_type) = 1;
     }
 
+  /* If we are reading an enum from a .debug_types unit, and the enum
+     is a declaration, and the enum is not the signatured type in the
+     unit, then we do not want to add a symbol for it.  Adding a
+     symbol would in some cases obscure the true definition of the
+     enum, giving users an incomplete type when the definition is
+     actually available.  Note that we do not want to do this for all
+     enums which are just declarations, because C++0x allows forward
+     enum declarations.  */
+  if (cu->per_cu->debug_type_section
+      && die_is_declaration (die, cu))
+    {
+      struct signatured_type *type_sig;
+
+      type_sig
+	= lookup_signatured_type_at_offset (dwarf2_per_objfile->objfile,
+					    cu->per_cu->debug_type_section,
+					    cu->per_cu->offset);
+      if (type_sig->type_offset != die->offset)
+	return;
+    }
+
   new_symbol (die, this_type, cu);
 }