2010-12-21  Ulrich Weigand  <uweigand@de.ibm.com>
 
	LP: #662324
	Backport from mainline:

	2010-12-17  Dodji Seketeli  <dodji@redhat.com>

	gcc/
	* dwarf2out.c (gen_type_die_with_usage): Do not try to emit debug
	info for a redundant typedef that has DECL_ORIGINAL_TYPE set. Use
	that underlying type instead.

	gcc/testsuite/
	* g++.dg/debug/dwarf2/self-ref-1.C: New test.
	* g++.dg/debug/dwarf2/self-ref-2.C: Likewise.

=== modified file 'gcc/dwarf2out.c'
--- old/gcc/dwarf2out.c	2010-10-04 00:50:43 +0000
+++ new/gcc/dwarf2out.c	2010-12-21 18:46:10 +0000
@@ -18993,6 +18993,16 @@
   if (type == NULL_TREE || type == error_mark_node)
     return;
 
+  if (TYPE_NAME (type) != NULL_TREE
+      && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
+      && is_redundant_typedef (TYPE_NAME (type))
+      && DECL_ORIGINAL_TYPE (TYPE_NAME (type)))
+    /* The DECL of this type is a typedef we don't want to emit debug
+       info for but we want debug info for its underlying typedef.
+       This can happen for e.g, the injected-class-name of a C++
+       type.  */
+    type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
+
   /* If TYPE is a typedef type variant, let's generate debug info
      for the parent typedef which TYPE is a type of.  */
   if (TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL

=== added file 'gcc/testsuite/g++.dg/debug/dwarf2/self-ref-1.C'
--- old/gcc/testsuite/g++.dg/debug/dwarf2/self-ref-1.C	1970-01-01 00:00:00 +0000
+++ new/gcc/testsuite/g++.dg/debug/dwarf2/self-ref-1.C	2010-12-21 18:46:10 +0000
@@ -0,0 +1,28 @@
+// Origin: PR debug/45088
+// { dg-do compile }
+// { dg-options "-g -dA" }
+// { dg-final { scan-assembler-times "\[^\n\r\]*\\(DIE\[^\n\r\]*DW_TAG_pointer_type\\)\[\n\r\]{1,2}\[^\n\r\]*DW_AT_byte_size\[\n\r\]{1,2}\[^\n\r\]*DW_AT_type" 4 } }
+
+struct A
+{
+    virtual ~A();
+};
+
+struct B : public A
+{
+    virtual ~B(){}
+};
+
+struct C : public B
+{
+    A* a1;
+};
+
+int
+main()
+{
+    C c;
+    c.a1 = 0;
+    return 0;
+}
+

=== added file 'gcc/testsuite/g++.dg/debug/dwarf2/self-ref-2.C'
--- old/gcc/testsuite/g++.dg/debug/dwarf2/self-ref-2.C	1970-01-01 00:00:00 +0000
+++ new/gcc/testsuite/g++.dg/debug/dwarf2/self-ref-2.C	2010-12-21 18:46:10 +0000
@@ -0,0 +1,29 @@
+// Origin: PR debug/45088
+// { dg-do compile }
+// { dg-options "-g -dA" }
+// { dg-final { scan-assembler-times "\[^\n\r\]*\\(DIE\[^\n\r\]*DW_TAG_pointer_type\\)\[\n\r\]{1,2}\[^\n\r\]*DW_AT_byte_size\[\n\r\]{1,2}\[^\n\r\]*DW_AT_type" 4 } }
+
+template<class T>
+struct A
+{
+    virtual ~A();
+};
+
+struct B : public A<int>
+{
+    virtual ~B(){}
+};
+
+struct C : public B
+{
+    A<int>* a1;
+};
+
+int
+main()
+{
+    C c;
+    c.a1 = 0;
+    return 0;
+}
+