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

[Tom Verhoeff]

On Thu, Apr 06, 2006 at 11:04:02PM +0200, Jonas Maebe wrote:
> 
> On 6 apr 2006, at 22:59, Tom Verhoeff wrote:
> 
> >This raises the concern that precompiled units become obsolete when
> >the user of such a unit upgrades the compiler.  The compiler  
> >apparently
> >requires that the System unit of the precompiled unit and of the using
> >program are IDENTICAL (which is enforced by the somewhat weaker check
> >of comparing their checksums; but in practice that will have the same
> >effect).
> 
> The checksum is only calculated on the interface (i.e. all exported  
> symbols), it's not a generic binary checksum of the entire unit.

OK.  I didn't know that, and haven't found it in the documentation
(or have I missed it?).  I have updated the wiki page accordingly.

	Tom
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