[Bug other/100695] New: Format decoder, quoting in 'dump_printf' etc.

[tschwinge at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100695

            Bug ID: 100695
           Summary: Format decoder, quoting in 'dump_printf' etc.
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
                CC: dmalcolm at gcc dot gnu.org
  Target Milestone: ---

For user-visible '-fopt-info' diagnostics ('dump_printf' etc.), I'm trying to
pretty-print a TREE DECL, using the '%T' format code.  As in other compiler
diagnostics, I'd like the output to be quoted, so I tried using '%qT' but that
prints the same as '%T' (unexpected?).  Using '%<%T%>' prints the desired
output -- but GCC bootstrap doesn't like that one:

    [...]/gcc/omp-low.c:10171:33: error: ‘T’ conversion used within a quoted
sequence [-Werror=format=]
    10171 |                    "variable %<%T%> ", decl);
          |                                 ^

I'll work around that, but something seems inconsistent here?