[Bug c++/88446] New: __builtin_is_constant_evaluated rejects some converted constant expressions.

[eric at efcs dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88446

            Bug ID: 88446
           Summary: __builtin_is_constant_evaluated rejects some converted
                    constant expressions.
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: eric at efcs dot ca
  Target Milestone: ---

__builtin_is_constant_evaluated() is not a constant expression when used in
array bounds or new expressions.


// g++ -fsyntax-only -std=c++2a 
char CA[__builtin_is_constant_evaluated()]; // rejects-valid
auto CP = new char[3][__builtin_is_constant_evaluated()]; // rejects-valid