[fpc-pascal] H2pas tool vs others, C header translation

[Marco van de Voort]

In our previous episode, Dmitry Boyarintsev said:
> 
> I'm using Chelper.  (http://wiki.freepascal.org/Chelper)
> It's my choice, because it preserves comments (which is usually an
> important part of open-source libs)
> plus, can be configured to handle library header-specific defines.
> Naturally, the process is semi-automatic, but get be done quite quickly.

Note that to convert C (as in source code, not headers), I did use other
tools in the past. Can't remember which though.