[fpc-pascal] When are used units recompiled? (wiki page added)

[Tom Verhoeff]

On Fri, Apr 07, 2006 at 10:24:59AM +0200, Peter Vreman wrote:
> 
> There is nothing different compared with TP / Delphi. The internal PPU
> format is made for speed and contains direct references from one PPU to
> another PPU. Incompatible PPUs can therefor never be used together.

I could not find any of this in the documentation, but I may have
looked in the wrong places.  Of course, I am not reading TP / Delphi
doc when using FPC :-).

> The release of closed source PPUs need to be done on a per stable release.
> Just like with delphi and tp7.
> 
> So please don't make a big issue out of this, the situation is still the
> same as it was for the last 20+ years.

Except that there were fewer releases/platforms to cope with, when using
TP or Delphi.

I just happened to be bitten by it in an unexpected way.  If it is
properly documented, then there is no issue.  I have tried to remedy
that by creating the wiki page on relasing units without source code.
It could be helpful if an FPC developer checks that page:

<http://www.freepascal.org/wiki/index.php/Releasing_units_without_source_code>

It might be useful to include a bit in the User's Manual as well
(updated Section 3.3 on Compiling a unit).

	Tom
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