Is there some way to globally declare version= or debug= statements in a file and have them apply to the entire project being compiled?  As the documentation says these only apply to the module scope they exist in, and need to be added to the command line otherwise.  It would be a bit easier for me to maintain a separate .d source file when I want to add/comment out statements for testing than to keep updating the build command line.  I tried using a mixin, such as:

// constants.d
module constants;
enum VERSIONS = q{
	version=Compress;
};

// main.d
import constants;
mixin(VERSIONS);
void main() {
	version(Compress)
		writeln("Compress it!");
	version(Decompress)
		writeln("Decompress it!");
}

This does seem to work inside function bodies, but not at module scope in the importing file.  e.g.:

// main.d
import constants;
mixin(VERSIONS)
version(Compress) {
	...
}

Gives: Error: version `Compress` defined after use

On Wednesday, 12 February 2020 at 08:44:24 UTC, cc wrote:
> Is there some way to globally declare version= or debug= statements in a file and have them apply to the entire project being compiled?  As the documentation says these only apply to the module scope they exist in, and need to be added to the command line otherwise.  It would be a bit easier for me to maintain a separate .d source file when I want to add/comment out statements for testing than to keep updating the build command line.

https://dlang.org/dmd-windows.html#switches

specifies that DMD may be passed a file on the command line that contains compiler arguments and switches. This may be freely combined with regular command line arguments if you so wish.

So, you could have a file called 'versions' containing this:

# Setting 'Compress' version
-version=Compress
# Optionally set other versions
#-version=Foo
#-version=Bar

and feed it to dmd like so:

    dmd -w -wi -g @versions -main foo.d

--
  Simen

On Wednesday, 12 February 2020 at 09:28:15 UTC, Simen Kjærås wrote:
> https://dlang.org/dmd-windows.html#switches
>
> specifies that DMD may be passed a file on the command line that contains compiler arguments and switches. This may be freely combined with regular command line arguments if you so wish.
>
> So, you could have a file called 'versions' containing this:
>
> # Setting 'Compress' version
> -version=Compress
> # Optionally set other versions
> #-version=Foo
> #-version=Bar
>
> and feed it to dmd like so:
>
>     dmd -w -wi -g @versions -main foo.d
>
> --
>   Simen

Ahh missed that, that should do it, thanks!