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
operating system.
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
everywhere?
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...
Daniël
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