Re: [PATCH RFC 2/3] rust: implement a test balloon via the "varint" subsystem

> On 2025-09-04 at 14:26:44, Patrick Steinhardt wrote:
> > diff --git a/meson.build b/meson.build
> > index 1c0e98bbc14..b52a68b0bb6 100644
> > --- a/meson.build
> > +++ b/meson.build
> > @@ -1713,6 +1712,10 @@ rust_option = get_option('rust').disable_auto_if(not rust_available)
> >  
> >  if rust_option.allowed() and meson.version().version_compare('>=1.9.0')
> >    subdir('src')
> > +else
> > +  libgit_sources += [
> > +    'varint.c',
> > +  ]
> >  endif
> 
> Can we also add a #define constant when building?  For instance, if I'm
> writing interop code in Rust, I'll need to be able to do something like
> this:
> 
>     int do_foobar()
>     {
>     #ifdef RUST
>       /* Call some code */
>     #else
>       die(_("interoperability not supported"));
>     #endif
>     }