How do you declare manifest constants?

[Steven Schveighoffer]

On 11/4/21 12:43 PM, Andrey Zherikov wrote:
> I want to embed some info from build system - version info, for example. 
> I can easily do this with C++ compiler by `-DVERSION="1.2.3"` but there 
> is no such an option in dmd. So I'm wondering how do people workaround 
> this?
> I see only one way: generate a file and add it to the build (file might 
> be `.d` source or something included by import expression).

D doesn't have any equivalent for this. The closest you can get is to 
turn on `version` identifiers.

There is also a quirky `-version=123` which is IMO, a completely useless 
feature.

Your best bet is to do what you are doing -- generate a d file, and then 
include it.

Note, there is at least one dub package which does this for you: 
https://code.dlang.org/packages/gen-package-version

I use it in my build and it works OK. You just have to remember to 
attribute your tag in git.

-Steve