[fpc-devel] Purpose of "uses ... in"?
daniel.mantione at freepascal.org
Sun Jul 11 19:48:10 CEST 2010
Op Sun, 11 Jul 2010, schreef Hans-Peter Diettrich:
> I know that the "in <filespec>" is part of the Delphi syntax, but what is it
> really good for?
In my opinion, it is not usefull. I have never seen a clear description of
what the semantics should be, for example what happens if the code being
compiled is found in the unit path, or if you point to a different
directory than the current (i.e. "fpc subdir/unit.pas"). If you use it,
you often also get into trouble with include files.
Another problem is that filename pathnames syntactically depend on the
In my opinion, the unit path (-Fu) is the proper way to instruct the
compiler where it should search for your units. "uses ... in" is a Delphi
relic we have inherited.
> AFAIK it's not allowed to "rename" units this way, and since (currently) only
> absolute filenames are implemented, I really wonder why FPC allows to use it
> IMO the filespec should allow for relative pathes, and also the use of FPC
> macros should be possible (e.g. FPCSourceDir).
> When there exists interest in such an extended functionality, but nobody has
> the time to implement it, I'll try to implement it myself.
I am skeptical, but if you can make it more usefull...
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