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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/96184] [9/10 Regression] GCC treats "use of local variable
 with automatic storage from containing function" differently in versions
Date: Fri, 10 Sep 2021 06:56:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96184

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |rejects-valid
     Ever confirmed|0                           |1
            Summary|GCC treats "use of local    |[9/10 Regression] GCC
                   |variable with automatic     |treats "use of local
                   |storage from containing     |variable with automatic
                   |function" differently in    |storage from containing
                   |versions                    |function" differently in
                   |                            |versions
   Target Milestone|---                         |9.5
   Last reconfirmed|                            |2021-09-10

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So I think it is legal because if we have:


int main(){
    int a  =3D 10;
    int const b =3D 10;
    static constexpr int d =3D b ? 0 : a =3D b;
    auto p1 =3D [ ] () noexcept ( d) { return d;};
    return d;
}

the d is a constexpr at this point and a valid one and was even accepted be=
fore
in GCC 8.5.0.

So this is only a regression in GCC 9 and GCC 10.=