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Subject: [Bug c++/100367] [11/12 Regression] Internal compiler error when
 std::lexicographical_compare_three_way third and fourth argument are reverse
 iterators
Date: Wed, 19 May 2021 20:17:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100367

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:cd67343703ef4fa61de837f4690eba70d2760825

commit r12-928-gcd67343703ef4fa61de837f4690eba70d2760825
Author: Jason Merrill <jason@redhat.com>
Date:   Tue May 18 12:29:33 2021 -0400

    c++: ICE with <=3D> fallback [PR100367]

    Here, when genericizing lexicographical_compare_three_way, we haven't y=
et
    walked the operands, so (a =3D=3D a) still sees ADDR_EXPR <a>, but this=
 is
after
    we've changed the type of a to REFERENCE_TYPE.  When we try to fold (a =
=3D=3D
a)
    by constexpr evaluation, the constexpr code doesn't understand trying to
    take the address of a reference, and we end up crashing.

    Fixed by avoiding constexpr evaluation in genericize_spaceship, by using
    fold_build2 instead of build_new_op on scalar operands.  Class operands
    should have been expanded during parsing.

            PR c++/100367
            PR c++/96299

    gcc/cp/ChangeLog:

            * method.c (genericize_spaceship): Use fold_build2 for scalar
            operands.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/spaceship-fallback1.C: New test.=