2017-02-28  Jakub Jelinek  <jakub@redhat.com>

	Backport from mainline
	2015-12-02  Jan Hubicka  <hubicka@ucw.cz>

	PR ipa/68184
	* cgraphunit.c (cgraph_node::analyze): Set can_throw_external.

	* g++.dg/torture/pr68184.C: New testcase.

--- gcc/cgraphunit.c.jj	2014-09-10 09:15:51.000000000 +0200
+++ gcc/cgraphunit.c	2017-02-28 08:24:44.387385510 +0100
@@ -626,8 +626,10 @@ cgraph_analyze_function (struct cgraph_n
     }
   else if (node->thunk.thunk_p)
     {
-      cgraph_create_edge (node, cgraph_get_node (node->thunk.alias),
-			  NULL, 0, CGRAPH_FREQ_BASE);
+      struct cgraph_node *t = cgraph_get_node (node->thunk.alias);
+      cgraph_create_edge (node, t, NULL, 0,
+			  CGRAPH_FREQ_BASE)->can_throw_external
+	= !TREE_NOTHROW (t->symbol.decl);
     }
   else if (node->dispatcher_function)
     {
--- gcc/testsuite/g++.dg/torture/pr68184.C.jj	2017-02-28 08:26:09.205246069 +0100
+++ gcc/testsuite/g++.dg/torture/pr68184.C	2015-12-03 16:39:34.589010321 +0100
@@ -0,0 +1,31 @@
+// { dg-do run }
+namespace {
+struct IFoo { virtual void foo() = 0; };
+struct IBar { virtual void bar() = 0; };
+
+struct FooBar : private IBar, private IFoo
+{
+    void call_foo()
+    {
+        try
+        {
+            static_cast<IFoo*>(this)->foo();
+        }
+        catch( ... ) {}
+    }
+    void foo() { throw 1; }
+    void bar()  {}
+};
+
+void test()
+{
+    FooBar foobar;
+    foobar.call_foo();
+}
+}
+int main()
+{
+    test();
+    return 0;
+}
+