[Bug c++/104877] New: missing standard gnu++20 in diagnostic

[roland.illig at gmx dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104877

            Bug ID: 104877
           Summary: missing standard gnu++20 in diagnostic
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roland.illig at gmx dot de
  Target Milestone: ---

cp/parser.cc says:
> use of %<auto%> in parameter declaration only available with %<-std=c++20%> 
> or %<-fconcepts%>

What about %<-std=gnu++20%>?