Accepting contributions for Rust-based font indexing?

[Werner LEMBERG]

>> What exactly do you mean with 'build option'?  I would like to have
>> a the possibility to select the backend at runtime so that it is
>> easy to run regression tests with different backends using a single
>> FontConfig library.  This would need an additional (but rather
>> trivial) API function, though, I guess.
> 
> I mean a compile time option in meson, which results in preprocessor
> definitions that produce different builds of FontConfig, compare
> here:
> https://gitlab.freedesktop.org/drott/fontconfig/-/blob/fontationsIndexing/src/fcdir.c?ref_type=heads#L88

OK.

> This could be made to work as a runtime switch where FontConfig is
> linked with both backends, but that increases binary size and my
> assumption is FontConfig clients generally do not need switchable
> backends?

Correct.  However, I see much benefits in such a switch being
conditionally available (with another Meson option) so that people can
install a 'debug version' of FontConfig that allows switching,
probably via the `FC_DEBUG` environment variable.  Such a feature
would tremendously simplify checking real-world problems by comparing
the created log files of the two different backends.


    Werner