re PR debug/37890 (Incorrect nesting for DW_TAG_imported_declaration)

	PR debug/37890
	* name-lookup.c (do_namespace_alias): Don't call global_decl debug
	hook at function scope.

From-SVN: r144913

gcc/cp/ChangeLog

@@ -6,6 +6,10 @@
 	* cp-gimplify.c (cp_gimplify_expr): Don't assert the first operand
 	is a NAMESPACE_DECL.
 
+	PR debug/37890
+	* name-lookup.c (do_namespace_alias): Don't call global_decl debug
+	hook at function scope.
+
 	PR debug/39471
 	* cp-gimplify.c (cp_gimplify_expr): Don't set DECL_NAME
 	on IMPORTED_DECL.

gcc/cp/name-lookup.c

@@ -3337,7 +3337,8 @@ do_namespace_alias (tree alias, tree name_space)
   pushdecl (alias);
 
   /* Emit debug info for namespace alias.  */
-  (*debug_hooks->global_decl) (alias);
+  if (!building_stmt_tree ())
+    (*debug_hooks->global_decl) (alias);
 }
 
 /* Like pushdecl, only it places X in the current namespace,