PR c++/92496 - ICE with <=> and no #include <compare>.

	* typeck.c (cp_build_binary_op): Handle error from spaceship_type.

From-SVN: r279331

gcc/cp/ChangeLog

+2019-12-12  Jason Merrill  <jason@redhat.com>
+
+	PR c++/92496 - ICE with <=> and no #include <compare>.
+	* typeck.c (cp_build_binary_op): Handle error from spaceship_type.
+
 2019-12-11  David Malcolm  <dmalcolm@redhat.com>
 
 	* cxx-pretty-print.c (cxx_pretty_printer::clone): New vfunc

gcc/cp/typeck.c

@@ -5418,7 +5418,11 @@ cp_build_binary_op (const op_location_t &location,
 	result_type = NULL_TREE;
 
       if (result_type)
-	build_type = spaceship_type (result_type, complain);
+	{
+	  build_type = spaceship_type (result_type, complain);
+	  if (build_type == error_mark_node)
+	    return error_mark_node;
+	}
 
       if (result_type && arithmetic_types_p)
 	{

gcc/testsuite/g++.dg/cpp2a/spaceship-synth-neg3.C

+// PR c++/92496
+// { dg-do compile { target c++2a } }
+
+template<auto V>
+struct A {};
+
+struct B {
+    constexpr auto operator<=>(const B&) const = default; // { dg-error "" }
+    int value;
+};
+
+A<B{}> t;