Is "FPC_FULLVERSION" not configured properly in some builds?

[TRon]

Will the use of revinc (still) influence the $fpcversion define/variable ?

[PascalDragon]

How does writeln(FPC_FULLVERSION) work then?

Where does FPC_FULLVERSION come from if it's only a define.
(I can't use any other defines like that)

O, forget my question.
It's a macro.
What line only works if macros is on ( {$MACRO ON}  ).

It's not a macro. It's a preprocessor constant that can be used no matter if $MACRO is enabled or not, just like any (untyped or preprocessor) constant does.

Will the use of revinc (still) influence the $fpcversion define/variable ?

FPCVERSION is not, FPCFULLVERSION is.

[rvk]

It's not a macro. It's a preprocessor constant that can be used no matter if $MACRO is enabled or not, just like any (untyped or preprocessor) constant does.

I couldn't. I needed to add {$MACRO ON} before FPC_FULLVERSION was recognized in writeln(FPC_FULLVERSION).

I can try again later.

[PascalDragon]

Now I understand what you mean. FPC_FULLVERSION is supposed to be used inside preprocessor directives. That does not need {$MACRO ON}, however using it as a “constant” in the real Pascal source does.

The correct way without {$MACRO ON} is to use {$I %FPCVERSION%} (though the be fair that is the string variant with dots instead of the numeric version 🤷‍♀️)