re PR ipa/60854 (inline constructor of extern template)

	PR ipa/60854
	* ipa.c (symtab_remove_unreachable_nodes): Mark targets of
	external aliases alive, too.
	* g++.dg/torture/pr60854.C: New testcase.

From-SVN: r209459

gcc/ChangeLog

+2014-04-16  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/60854
+	* ipa.c (symtab_remove_unreachable_nodes): Mark targets of
+	external aliases alive, too.
+
 2014-04-16  Andrew  Pinski  <apinski@cavium.com>
 
 	* config/host-linux.c (TRY_EMPTY_VM_SPACE): Change aarch64 ilp32

gcc/ipa.c

@@ -415,7 +415,18 @@ symtab_remove_unreachable_nodes (bool before_inlining_p, FILE *file)
 			  || !DECL_EXTERNAL (e->callee->decl)
 			  || e->callee->alias
 			  || before_inlining_p))
+		    {
+		      /* Be sure that we will not optimize out alias target
+			 body.  */
+		      if (DECL_EXTERNAL (e->callee->decl)
+			  && e->callee->alias
+			  && before_inlining_p)
+			{
+		          pointer_set_insert (reachable,
+					      cgraph_function_node (e->callee));
+			}
 		      pointer_set_insert (reachable, e->callee);
+		    }
 		  enqueue_node (e->callee, &first, reachable);
 		}
 

gcc/testsuite/ChangeLog

+2014-04-16  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/60854
+	* g++.dg/torture/pr60854.C: New testcase.
+
 2014-04-16  Catherine Moore  <clm@codesourcery.com>
 
 	* gcc.target/mips/umips-store16-2.c: New test.

gcc/testsuite/g++.dg/torture/pr60854.C

+template <typename T>
+class MyClass
+{
+public:
+  __attribute__ ((__always_inline__)) inline MyClass () { ; }
+};
+
+extern template class MyClass<double>;
+
+void Func()
+{
+  MyClass<double> x;
+}