• Dennis Ritchie (11/11) Feb 11 2015 Tell me, please, is it possible to set an arbitrary condition
• Vladimir Panteleev (9/20) Feb 11 2015 Specify -version=USE_MYLIB12 on the command line.
• Dennis Ritchie (1/1) Feb 11 2015 Thanks.

"Dennis Ritchie" <dennis.ritchie mail.ru> writes:

Tell me, please, is it possible to set an arbitrary condition 
conditional compilation at the command prompt, type DUSE_MYLIB12 
and in the code as:

version(USE_MYLIB12) {
        .....
}

And I didn't like Any DeclarationBlock or Statement that is not 
compiled in still must be syntactically correct:
http://dlang.org/version.html

It may be that using an optional library code is correct, and 
without it not?

"Vladimir Panteleev" <vladimir thecybershadow.net> writes:

On Wednesday, 11 February 2015 at 11:26:20 UTC, Dennis Ritchie 
wrote:
 Tell me, please, is it possible to set an arbitrary condition 
 conditional compilation at the command prompt, type 
 DUSE_MYLIB12 and in the code as:

 version(USE_MYLIB12) {
        .....
 }

Specify -version=USE_MYLIB12 on the command line.

 And I didn't like Any DeclarationBlock or Statement that is not 
 compiled in still must be syntactically correct:
 http://dlang.org/version.html

 It may be that using an optional library code is correct, and 
 without it not?

No, that's not possible. Syntactically correct != semantically 
correct. It just means that the syntax rules of the language are 
respected, e.g. parens must be correctly nested (no [} or 
something like that). Since D libraries can't affect the syntax 
of the language, no code can be syntactically correct only in 
that library's presence.

"Dennis Ritchie" <dennis.ritchie mail.ru> writes:

Thanks.