re PR c++/68184 (Exception from a virtual function does not get caught)

	PR ipa/68184
	* g++.dg/torture/pr68184.C: New testcase.
	* cgraphunit.c (cgraph_node::analyze): Set can_throw_external.

From-SVN: r231217

gcc/ChangeLog

+2015-12-02  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/68184
+	* cgraphunit.c (cgraph_node::analyze): Set can_throw_external.
+
 2015-12-02  Aditya Kumar  <aditya.k7@samsung.com>
 	    Sebastian Pop  <s.pop@samsung.com>
 

gcc/cgraphunit.c

@@ -575,6 +575,7 @@ cgraph_node::analyze (void)
       cgraph_node *t = cgraph_node::get (thunk.alias);
 
       create_edge (t, NULL, 0, CGRAPH_FREQ_BASE);
+      callees->can_throw_external = !TREE_NOTHROW (t->decl);
       /* Target code in expand_thunk may need the thunk's target
 	 to be analyzed, so recurse here.  */
       if (!t->analyzed)

gcc/testsuite/ChangeLog

+2015-12-02  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/68184
+	* g++.dg/torture/pr68184.C: New testcase.
+
 2015-12-03  Jakub Jelinek  <jakub@redhat.com>
 
 	PR preprocessor/57580

gcc/testsuite/g++.dg/torture/pr68184.C

+// { 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;
+}
+