[Bug c/104896] New: Messages use %<%s%> instead of the idiomatic %qs

[roland.illig at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104896

            Bug ID: 104896
           Summary: Messages use %<%s%> instead of the idiomatic %qs
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roland.illig at gmx dot de
                CC: egallager at gcc dot gnu.org, msebor at gcc dot gnu.org
  Target Milestone: ---

As of 2022-03-12, the GCC tree contains 44 instances of the string "%<%s%>".
Please have a look whether they can be replaced with the idiomatic %qs, and if
not, document them.