[fpc-pascal] Testing existence of a file at compilation time

[Sven Barth]

Am 26.04.2012 11:21 schrieb "Mark Morgan Lloyd" <
markMLl.fpc-pascal at telemetry.co.uk>:
>
> Is it possible to test for the existence of a file, directory or package
at compilation time, i.e. {$if exists() or similar?
>
> The specific scenario I'm looking at is where I want to publish a couple
of projects on Berlios, and the functionality will differ depending on
whether a particular (Lazarus) package is available: as an example,
character-by-character (not syntax-defined) colouring which I don't think I
can do in any standard text-output controls. If at compilation time it was
possible to detect that a package was available, it would then be possible
to enable the code that at runtime created a graphical component from that
package without any intervention on the part of the user building the app.

That's currently not possible.

> I've just checked the 2.6.0 manuals: where are things like {$if
declared() defined?

It's in the Programmer's manual:
http://www.freepascal.org/docs-html/prog/progsu112.html#x124-1250002.4.1

Regards,
Sven
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