[Patch] add more C++ name hints. v2

[Ulrich Drepper]

Ping!  Anyone interested in this.  I'm bootstrapping my trunk builds with
this patch without problems.

On Mon, Aug 22, 2022 at 9:09 PM Ulrich Drepper <drepper@redhat.com> wrote:

> This is the second version of the proposed patch to add more identifiers
> to the known list to give hints about #include and version numbers.
>
> Marek looked through the first version and found it acceptable but
> remarked that the list is getting long and the sequential search performed
> by the current code might not be adequate.  Especially because I offered to
> add even more known names to the list.
>
> This second version replaces the current lookup implementation with a
> gperf-generated hash function.  Since gperf is already a dependency for
> maintainers the use of the tool itself shouldn't be a problem.
>
> I followed the existing practice for the cfns.gperf file and its use so,
> if the handling of that file works, so should the handling of the new file,
> std-name-hint.gperf.
>
> Please let me know if this is acceptable.  I built a compiler with this
> code and tested the hinting.
>
> contrib/ChangeLog
>         * gcc_update (files_and_dependencies): Add gcc/cp/std-name-hint.h
>         depend on gcc/cp/std-name-hint.gperf.
>
> gcc/cp/ChangeLog
>         * Make-lang.in: Add rule to build std-name-hint.h.
>         * name-lookup.cc (struct std_name_hint): Remove definition.
> Instead...
>         Include "std-name-hint.h".
>         (get_std_name_hint): Remove hints array and lookup code.  Instead
> call
>         std_name_hint_lookup::find.
>         * std-name-hint.gperf: New file.
>         * std-name-hint.h: New file.
>