Re^4: Installing Sybase::DBlib problems

That's not the way to do it. use statements are being executed at compile time, and the condition is being evaluated at runtime.

That's what the if module is for... (or use require instead of use)

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Re^5: Installing Sybase::DBlib problems by wilko (Acolyte) on Nov 20, 2008 at 13:46 UTC
Thanks almut and all Monks who offered their wisdom! I didn't know about the 'if' module `use lib './lib'; use if $ARGV[0] eq "recv", Sybase::DBlib;` [download] Regards John	[reply] [d/l]
Re^6: Installing Sybase::DBlib problems by almut (Canon) on Nov 20, 2008 at 14:01 UTC
Just two more things to be aware of. It's usually better to specify the module name as a string (`"Sybase::DBlib"`)¹, otherwise you'd get a "Bareword ... not allowed" error when running under `"use strict"`. Second, the `"use if ..."` condition is tested at compile time. In this particular case with `$ARGV[0]` this is not a problem, because the variable is initialized early on. But if you use some other variable, you might need to wrap its assigment in a `BEGIN {...}` block... ___ ¹ only with `"use if"`, that is — with plain `"use"`, in contrast, a bareword is needed.	[reply] [d/l] [select]