FYI my experience with D' version

[Don Clugston]

On 30/07/12 14:32, Jacob Carlborg wrote:
> On 2012-07-30 12:30, torhu wrote:
>
>> version is good for global options that you set with -version on the
>> command line.  And can also be used internally in a module, but doesn't
>> work across modules.  But it seems you have discovered this the hard way
>> already.
>>
>> I think there was a discussion about this a few years ago, Walter did it
>> this way on purpose.  Can't remember the details, though.
>
> He probably wants to avoid the C macro hell.
>


IIRC it's because version identifiers are global.

______________________________
module b;
version = CoolStuff;
______________________________

module a;
import b;
version (X86)
{
    version = CoolStuff;
}

version(CoolStuff)
{
    // Looks as though this is only true on X86.
    // But because module b used the same name, it's actually true always.
}
______________________________

These types of problems would be avoided if we used the one-definition 
rule for version statements, bugzilla 7417.