Sorry for resending this email. I forgot using “Reply All”.

Thank you for your response, Arsen and Jakub.
I did not know C++ also supports Unicode identifiers.
I looked a little into C++ and found C++ accepts the same form of
identifiers as Rust.
So I will do further investigation of libcpp with the hope that it can also
be used in the Rust frontend.

Raiki Tamura

On Thu, Mar 16, 2023 at 0:18 Jakub Jelinek <jakub@redhat.com> wrote:

> On Wed, Mar 15, 2023 at 11:00:19AM +0000, Philip Herron via Gcc wrote:
> > Excellent work on getting up to speed on the rust front-end. From my
> > perspective I am interested to see what the wider GCC community thinks
> > about using https://www.gnu.org/software/libunistring/ library within
> GCC
> > instead of rolling our own, this means it will be another dependency on
> GCC.
> >
> > The other option is there is already code in the other front-ends to do
> > this so in the worst case it should be possible to extract something out
> of
> > them and possibly make this a shared piece of functionality which we can
> > mentor you through.
>
> I don't know what exactly Rust FE needs in this area, but e.g. libcpp
> already handles whatever C/C++ need from Unicode support POV and can handle
> it without any extra libraries.
> So, if we could avoid the extra dependency, it would be certainly better,
> unless you really need massive amounts of code from those libraries.
> libcpp already e.g. provides mapping of unicode character names to code
> points, determining which unicode characters can appear at the start or
> in the middle of identifiers, etc.
>
>         Jakub
>
>