--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/lto/pr90939_0.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,64 @@
+// PR ipa/90939
+// { dg-lto-do link }
+// { dg-lto-options { { -flto -O3 } } }
+
+
+typedef char uint8_t;
+template <class T> class A {
+public:
+  A(T *);
+};
+template <typename Derived, typename Base> const Derived &To(Base &p1) {
+  return static_cast<const Derived &>(p1);
+}
+class H;
+template <typename, typename Base> const H *To(Base *p1) {
+  return p1 ? &To<H>(*p1) : nullptr;
+}
+enum TextDirection : uint8_t;
+enum WritingMode : unsigned;
+class B {
+public:
+  WritingMode m_fn1();
+};
+class C {
+public:
+  int &m_fn2();
+};
+class D { double d;};
+class H : public D {};
+class F {
+public:
+  F(C, A<const int>, B *, WritingMode, TextDirection);
+};
+
+class G {
+public:
+  C NGLayoutAlgorithm_node;
+  B NGLayoutAlgorithm_space;
+  TextDirection NGLayoutAlgorithm_direction;
+  H NGLayoutAlgorithm_break_token;
+  G(A<const int> p1) __attribute__((noinline))
+    : break_token_(&NGLayoutAlgorithm_break_token),
+        container_builder_(NGLayoutAlgorithm_node, p1, &NGLayoutAlgorithm_space,
+                           NGLayoutAlgorithm_space.m_fn1(),
+                           NGLayoutAlgorithm_direction) {}
+  G(C p1, const H *) : G(&p1.m_fn2()) {}
+  A<H> break_token_;
+  F container_builder_;
+};
+
+class I : G {
+public:
+  I(const D *) __attribute__((noinline));
+};
+C a;
+I::I(const D *p1) : G(a, To<H>(p1)) {}
+
+D gd[10];
+
+int main (int argc, char *argv[])
+{
+  I i(&(gd[argc%2]));
+  return 0;
+}