Support for conditional compile

[pottmi]

COBOL Crew,

Is there any support conditional compile similar to what is
implemented for IBM here:

https://www.ibm.com/docs/en/i/7.4?topic=cd-conditional-compilation

Or for Micro Focus here:

https://www.microfocus.com/documentation/visual-cobol/vc60/DevHub/HRLHLHCOMP0J.html

Or Micro Focus Constants:

https://www.microfocus.com/documentation/visual-cobol/vc60/DevHub/HRCDRHCDIR24.html

I would like to find a way to make something like this work:

CONSTANT MYSUB 10

01 SOMEVAR PIC X OCCURS MYSUB TIMES.

That is: I can define a constant and then do a replace anywhere in the
code with the specified value.

Similar to what the C preprocessor does with #define.

[Simon Sobisch]

IBM implemented the COBOL2002 CDF and constant definition - GnuCOBOL supports that, too (actually supported it much longer - before any other compiler) with one exception: >> EVALUATE is not implemented yet - patches welcome.
So in general you should be fine using that. The exact syntax is:

01 CONSTANT MYSUB 10.
01 SOMEVAR.
        05 PIC X OCCURS MYSUB TIMES.
01 SOMERED PIC X(MYSUB) REDEFINES SOMEVAR.

GnuCOBOL also supports the common extension with level 78 constants:

78 MYSUB VALUE 10.
01 SOMEVAR.
        05 PIC X OCCURS MYSUB TIMES.
01 SOMERED PIC X(MYSUB) REDEFINES SOMEVAR.

The programmer's guide likely has documentation on how to use this including how to pass definitions from the command-line.