[PR c++/83667] Fix tree_dump ICE

https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00148.html
	PR c++/83667
	* method.c (make_alias_for): Copy DECL_CONTEXT.

	PR c++/83667
	* g++.dg/ipa/pr83667.C: New.

From-SVN: r256179

gcc/cp/ChangeLog

+2018-01-03  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/83667
+	* method.c (make_alias_for): Copy DECL_CONTEXT.
+
 2018-01-03  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/83592

gcc/cp/method.c

@@ -206,7 +206,7 @@ make_alias_for (tree target, tree newid)
 			   TREE_CODE (target), newid, TREE_TYPE (target));
   DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (target);
   cxx_dup_lang_specific_decl (alias);
-  DECL_CONTEXT (alias) = NULL;
+  DECL_CONTEXT (alias) = DECL_CONTEXT (target);
   TREE_READONLY (alias) = TREE_READONLY (target);
   TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (target);
   TREE_PUBLIC (alias) = 0;

gcc/testsuite/ChangeLog

+2018-01-03  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/83667
+	* g++.dg/ipa/pr83667.C: New.
+
 2018-01-03  Martin Liska  <mliska@suse.cz>
 
 	PR tree-optimization/83593

gcc/testsuite/g++.dg/ipa/pr83667.C

+/* { dg-options "-fdump-ipa-inline" } */
+// c++/83667 ICE dumping a static thunk
+
+struct a
+{
+  virtual ~a ();
+};
+
+struct b
+{
+  virtual void d (...);
+};
+
+struct c : a, b
+{
+  void d (...)
+  {
+  }
+};
+
+c c;
+
+// { dg-final { scan-ipa-dump "summary for void c::\\*.LTHUNK0" "inline" } }