Passing revision tag to the compiler

[Leandro Motta Barros]

On Sun, Mar 31, 2013 at 10:09 AM, Tobias Pankrath <tobias at pankrath.net> wrote:
> On Sunday, 31 March 2013 at 02:00:46 UTC, Leandro Motta Barros wrote:
>>
>> Hello,
>>
>>
>> I'd like to include the version control revision tag in a program. In
>> the C/C++ world I'd make my build system call the compiler like this:
>>
>>    g++ -D<MY_REVISION_HERE> .....
>>
>
> D has no preprocessor and no way to define global variables via a cmdline
> switch. The -version switch can be used conditionally compile in blocks of
> code but wont help you to "import" a value into your program. You can
> however use import expressions for this.
>
> See http://dlang.org/expression.html search import expression.
>
> ---
> immutable Revision = import("revision.data");
> ---
> And tell your VCS to always keep the revision in that file. DMD looks for
> imports in directories specified by the -J option.

Hello Tobias,

I have (miss)used import expressions before, but I forgot I could use them here.

Thanks a lot!

LMB