What does -vtls compiler flag does and ...

[welkam]

On Wednesday, 3 October 2018 at 20:58:01 UTC, Stanislav Blinov 
wrote:
> No, all *static non-immutable* variables are thread-local by 
> default, not just "all variables".
I misspoke but this should write something
https://run.dlang.io/is/3u1wFp

If you look at asm output there are "call _d_arraycatT at PLT32" 
instruction so those variables weren't optimized away and yet no 
output to stdout.

If remove that flag ldc now compiles dmd but lacks optimizations 
so more work needs to be done.