Is it possible to test for the existence of a file, directory or package
at compilation time, i.e. {$if exists() or similar?
The specific scenario I'm looking at is where I want to publish a couple
of projects on Berlios, and the functionality will differ depending on
whether a particular (Lazarus) package is available: as an example,
character-by-character (not syntax-defined) colouring which I don't
think I can do in any standard text-output controls. If at compilation
time it was possible to detect that a package was available, it would
then be possible to enable the code that at runtime created a graphical
component from that package without any intervention on the part of the
user building the app.
I've just checked the 2.6.0 manuals: where are things like {$if
declared() defined?
I note that the FPC documentation pointed to at
http://wiki.lazarus.freepascal.org/Lazarus_Documentation#Free_Pascal_Compiler_Documentation
is still 2.2.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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