Here we ICE because early_check_defaulted_comparison passed a null ctx to same_type_p. The attached test is ill-formed according to [class.compare.default]/1, so fixed by detecting this case early.
Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk? PR c++/94478 - ICE with defaulted comparison operator * method.c (early_check_defaulted_comparison): Give an error when the context is null. * g++.dg/cpp2a/spaceship-err4.C: New test. --- gcc/cp/method.c | 11 +++++++++++ gcc/testsuite/g++.dg/cpp2a/spaceship-err4.C | 7 +++++++ 2 files changed, 18 insertions(+) create mode 100644 gcc/testsuite/g++.dg/cpp2a/spaceship-err4.C diff --git a/gcc/cp/method.c b/gcc/cp/method.c index 41b9ff86bdd..9a21bfc1f66 100644 --- a/gcc/cp/method.c +++ b/gcc/cp/method.c @@ -1102,6 +1102,17 @@ early_check_defaulted_comparison (tree fn) return false; } + if (!ctx) + { + if (DECL_OVERLOADED_OPERATOR_IS (fn, SPACESHIP_EXPR)) + error_at (loc, "three-way comparison operator can only be defaulted " + "in a class definition"); + else + error_at (loc, "equality comparison operator can only be defaulted " + "in a class definition"); + return false; + } + if (!DECL_OVERLOADED_OPERATOR_IS (fn, SPACESHIP_EXPR) && !same_type_p (TREE_TYPE (TREE_TYPE (fn)), boolean_type_node)) { diff --git a/gcc/testsuite/g++.dg/cpp2a/spaceship-err4.C b/gcc/testsuite/g++.dg/cpp2a/spaceship-err4.C new file mode 100644 index 00000000000..00f90ced255 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp2a/spaceship-err4.C @@ -0,0 +1,7 @@ +// PR c++/94478 - ICE with defaulted comparison operator. +// { dg-do compile { target c++2a } } + +struct B {}; +bool operator!=(const B&, const B&) = default; // { dg-error "equality comparison operator can only be defaulted in a class definition" } +bool operator==(const B&, const B&) = default; // { dg-error "equality comparison operator can only be defaulted in a class definition" } +bool operator<=>(const B&, const B&) = default; // { dg-error "three-way comparison operator can only be defaulted in a class definition" } base-commit: 3d947f1f27188e3a61ba7f42399b1c348469fe13 -- Marek Polacek • Red Hat, Inc. • 300 A St, Boston, MA