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From: "sbergman at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96994] New: Missing code from consteval constructor
 initializing const variable
Date: Wed, 09 Sep 2020 11:27:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96994

            Bug ID: 96994
           Summary: Missing code from consteval constructor initializing
                    const variable
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sbergman at redhat dot com
  Target Milestone: ---

At least with a local build of recent GCC 11 trunk and with
gcc-c++-10.2.1-1.fc32.x86_64:

> $ cat test.cc
> #include <iostream>
> struct S1 {
>     consteval S1() { i =3D 1; }
>     int i =3D 0;
> };
> struct S2 {
>     constexpr S2() { i =3D 1; }
>     int i =3D 0;
> };
> S1 const s1a;
> constexpr S1 s1b;
> S2 const s2;
> int main() { std::cout << s1a.i << ' ' << s1b.i << ' ' << s2.i << '\n'; }

> $ g++ -std=3Dc++20 test.cc
> $ ./a.out
> 0 1 1

The first "0" is not as expected, the following two "1" demonstrate how sli=
ght
modifications of the code would lead to the expected outcome.=