re PR debug/77947 (ICE with -g and -O2 in strip_naming_typedef)

2016-10-12  Richard Biener  <rguenther@suse.de>

	PR debug/77947
	* cgraphunit.c (analyze_functions): Preserve cgraph nodes
	function context.

	* g++.dg/torture/pr77947.C: New testcase.

From-SVN: r241053

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2016-10-12  Richard Biener  <rguenther@suse.de>
+
+	PR debug/77947
+	* cgraphunit.c (analyze_functions): Preserve cgraph nodes
+	function context.
+
 2016-10-12  Thomas Schwinge  <thomas@codesourcery.com>
 
 	* lto-streamer.c: Fix LTO_STREAMER_DEBUG build.

gcc/cgraphunit.c

@@ -1126,6 +1126,13 @@ analyze_functions (bool first_time)
 		    = cgraph_node::get_create (DECL_ABSTRACT_ORIGIN (decl));
 		  origin_node->used_as_abstract_origin = true;
 		}
+	      /* Preserve a functions function context node.  It will
+		 later be needed to output debug info.  */
+	      if (tree fn = decl_function_context (decl))
+		{
+		  cgraph_node *origin_node = cgraph_node::get_create (fn);
+		  enqueue_node (origin_node);
+		}
 	    }
 	  else
 	    {

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2016-10-12  Richard Biener  <rguenther@suse.de>
+
+	PR debug/77947
+	* g++.dg/torture/pr77947.C: New testcase.
+
 2016-10-12  Pierre-Marie de Rodat  <derodat@adacore.com>
 
 	* gnat.dg/debug8.adb: New testcase.

gcc/testsuite/g++.dg/torture/pr77947.C

@@ -0,0 +1,29 @@
+// { dg-do compile }
+// { dg-additional-options "-g" }
+
+class A
+{
+public:
+  virtual bool m_fn1 () const = 0;
+};
+class B
+{
+  const A *m_fn2 () const;
+};
+inline const A *
+B::m_fn2 () const
+{
+  class C : A
+  {
+    bool
+    m_fn1 () const
+    {
+    }
+    C () {}
+  };
+}
+void
+fn1 (A &p1)
+{
+  p1.m_fn1 ();
+}