## Macro: SB-EXT:DEFGLOBAL
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> Defines NAME as a global variable that is always bound. VALUE is evaluated
> and assigned to NAME both at compile- and load-time, but only if NAME is not
> already bound.
> 
> Global variables share their values between all threads, and cannot be
> locally bound, declared special, defined as constants, and neither bound
> nor defined as symbol macros.
> 
> See also the declarations SB-EXT:GLOBAL and SB-EXT:ALWAYS-BOUND.

### Lambda list
```cl
(sb-impl::name sb-impl::value &optional sb-impl::doc)
```