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In a SFINAE context composite_pointer_type returns error_mark_node if the given pointer types are incompatible. But the SPACESHIP_EXPR case of cp_build_binary_op wasn't prepared for this error_mark_node result, which led to an ICE (from spaceship_comp_cat) for the below testcase. (In a non-SFINAE context composite_pointer_type issues a permerror and returns cv void* in this case, so this ICE seems specific to SFINAE.) PR c++/107542 gcc/cp/ChangeLog: * typeck.cc (cp_build_binary_op): In the SPACESHIP_EXPR case, handle an error_mark_node result type. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/spaceship-sfinae2.C: New test.
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