Am 28.02.2017 20:37 schrieb "Lars via Lazarus" < lazarus@lists.lazarus-ide.org>: > > On 2017-02-16 05:35, Graeme Geldenhuys via Lazarus wrote: >> >> On 2017-02-16 11:18, Ondrej Pokorny via Lazarus wrote: >>> >>> Well, you mixed up DEFINED and DECLARED macros. >> >> > > Sorry newbie question regarding these $IF directives: > > can someone explain why you would use "$IF defined" instead of $IFDEF... > > Obviously there are likely reasons for using one over the other.
$IFDEF FOO is an abbreviation for $IF DEFINED(FOO). The latter also allows to combine multiple checks using AND and OR (and also allowing comparisons with constant values) while the former can always only check for a single define. Regards, Sven
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