More fun with toStringz and the GC

[Steven Schveighoffer]

On 8/5/22 7:13 PM, jfondren wrote:
> On Friday, 5 August 2022 at 22:51:07 UTC, Don Allen wrote:
>> My theory: because gc_protect2 is never referenced, I'm guessing that 
>> the compiler is optimizing away the storage of the returned pointer, 
>> the supporting evidence being what I said in the previous paragraph. 
>> Anyone have a better idea?
> 
> A local variable definitely isn't enough: 
> https://forum.dlang.org/thread/xchnfzvpmxgytqprbosz@forum.dlang.org
> 
> This package came of it: https://code.dlang.org/packages/keepalive
> 

Yes, but I will warn you, the compilers are smart buggers. I think 
someone came up with a case where this still doesn't keep it alive (been 
a while since I made that).

The only true solution is to use `GC.addRoot` on the string and 
`GC.removeRoot` when you are done.

-Steve