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Subject: [Bug c++/108116] [12 Regression] ICE in check_noexcept_r, at
 cp/except.cc:1074 since r12-6897-gdec8d0e5fa00ceb2
Date: Tue, 07 Mar 2023 02:18:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108116

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:09c5937d8295fbc96f6d05cc12ec3709740a277d

commit r12-9230-g09c5937d8295fbc96f6d05cc12ec3709740a277d
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri Dec 23 11:17:45 2022 -0500

    c++: get_nsdmi in template context [PR108116]

    Here during ahead of time checking of C{}, we indirectly call get_nsdmi
    for C::m from finish_compound_literal, which in turn calls
    break_out_target_exprs for C::m's (non-templated) initializer, during
    which we build a call to A::~A and check expr_noexcept_p for it (from
    build_vec_delete_1).  But this is all done with processing_template_decl
    set, so the built A::~A call is templated (whose form was recently
    changed by r12-6897-gdec8d0e5fa00ceb2) which expr_noexcept_p doesn't
    expect, and we crash.

    This patch fixes this by clearing processing_template_decl before
    the call to break_out_target_exprs from get_nsdmi.  And since it more
    generally seems we shouldn't be seeing (or producing) non-templated
    trees in break_out_target_exprs, this patch also adds an assert to
    that effect.

            PR c++/108116

    gcc/cp/ChangeLog:

            * constexpr.cc (maybe_constant_value): Clear
            processing_template_decl before calling break_out_target_exprs.
            * init.cc (get_nsdmi): Likewise.
            * tree.cc (break_out_target_exprs): Assert processing_template_=
decl
            is cleared.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/nsdmi-template24.C: New test.

    (cherry picked from commit cf59c8983ef6590f0d69014f8dc8778b5b7691c6)=