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From: "r-gcc at mail dot uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96155] New: "throw" that is not executed in constexpr
 function fails to compile
Date: Fri, 10 Jul 2020 15:11:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96155

            Bug ID: 96155
           Summary: "throw" that is not executed in constexpr function
                    fails to compile
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: r-gcc at mail dot uk
  Target Milestone: ---

This fails to compile on gcc trunk, while the same code compiles fine in cl=
ang:

constexpr bool foo()
{
    for(int i =3D 0; i !=3D 5; ++i)
    {
        if(i =3D=3D 3)
            return false;
    }
    throw 5;
    return true;
}


this is the message I am getting:

error: expression =E2=80=98<throw-expression>=E2=80=99 is not a constant ex=
pression

live example:

https://godbolt.org/z/eqqr4f=