Add testcase from PR71959

	libgomp/

	PR lto/71959
	* testsuite/libgomp.oacc-c++/pr71959-aux.cc: New.
	* testsuite/libgomp.oacc-c++/pr71959.C: New.

Co-Authored-By: Julian Brown <julian@codesourcery.com>

From-SVN: r267806

libgomp/ChangeLog

+2019-01-10  Nathan Sidwell  <nathan@acm.org>
+	    Julian Brown  <julian@codesourcery.com>
+
+	PR lto/71959
+	* testsuite/libgomp.oacc-c++/pr71959-aux.cc: New.
+	* testsuite/libgomp.oacc-c++/pr71959.C: New.
+
 2019-01-09  Sebastian Huber  <sebastian.huber@embedded-brains.de>
 
 	* config/rtems/bar.c: Include "../linux/bar.c" and delete copy

libgomp/testsuite/libgomp.oacc-c++/pr71959-aux.cc

+// { dg-do compile }
+
+#define STR1(X) #X
+#define STR2(X) STR1(X)
+#define LABEL(X) STR2(__USER_LABEL_PREFIX__) X
+
+struct Iter
+{
+  int *cursor;
+
+  void ctor (int *cursor_) asm (LABEL ("_ZN4IterC1EPi"));
+  int *point () const asm (LABEL ("_ZNK4Iter5pointEv"));
+};
+
+#pragma acc routine
+void Iter::ctor (int *cursor_)
+{
+  cursor = cursor_;
+}
+
+#pragma acc routine
+int *Iter::point () const
+{
+  return cursor;
+}
+
+void apply (int (*fn)(), Iter out) asm (LABEL ("_ZN5Apply5applyEPFivE4Iter"));
+
+#pragma acc routine
+void apply (int (*fn)(), struct Iter out)
+{ *out.point() = fn (); }
+
+extern "C" void __gxx_personality_v0 ()
+{
+}

libgomp/testsuite/libgomp.oacc-c++/pr71959.C

+// { dg-additional-sources "pr71959-aux.cc" }
+
+// PR lto/71959 ICEd LTO due to mismatch between writing & reading behaviour
+
+struct Iter
+{
+  int *cursor;
+
+  Iter(int *cursor_) : cursor(cursor_) {}
+
+  int *point() const { return cursor; }
+};
+
+#pragma acc routine seq
+int one () { return 1; }
+
+struct Apply
+{
+  static void apply (int (*fn)(), Iter out)
+  { *out.point() = fn (); }
+};
+
+int main ()
+{
+  int x;
+
+#pragma acc parallel copyout(x)
+  Apply::apply (one, Iter (&x));
+
+  return x != 1;
+}