According to Omar Abu Al-Haija:
Is there any good Documentation for the GNU-Pascal Compiler, something like a programmers reference, or like the Borland's Help ...
In recent (beta/alpha) versions of GPC we have started to implement such an online reference manual. From RHIDE, you can call it with Ctrl+F1 - just like from Borland's IDE. Or else, you can run it through TeX and print it out.
But a lot of work will have to be done to complete this.
Greetings,
Peter