DMD: can't get extern __gshared to work right (vs. LDC)

rikki cattermole rikki at
Mon Feb 18 17:51:09 UTC 2019

On 19/02/2019 6:26 AM, DanielG wrote:
> In the meantime, while I'm waiting for this bug to be noticed by anybody 
> with the skills to address it, what would be the most elegant way of 
> working around it?
> Obviously I could do a:
> version(Windows) {
>    export extern __gshared ...
> } else {
>    extern __gshared ...
> }
> But what's the minimal way of toggling the presence of "export" in a 
> declaration? Using mixins feels kind of gross for this, but if that's 
> the only option ...
> Almost makes me long for the C preprocessor :P

Because you need two different versions to choose between them, either 
set a per module version or use static if with enum's.

But yeah, I would do that. Of course a mixin template with a code string 
(q{ ... }) would be cleaner. After all, ``export { mixin(str); }`` would 
work well.

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