[Bug c++/95016] New: [DR 2082] Referring to parameters in unevaluated operands of default arguments

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95016

            Bug ID: 95016
           Summary: [DR 2082] Referring to parameters in unevaluated
                    operands of default arguments
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

We give two errors here:

void
f ()
{
  int i;
  extern void g(int x = i);         // error
  extern void h(int x = sizeof(i)); // OK
}

but [dcl.fct.default]/7 now says "A local variable cannot be odr-used
([basic.def.odr]) in a default argument."

This is https://wg21.link/cwg2082