How to compile and link simple application?

[Julian]

On Monday, 8 April 2019 at 18:54:10 UTC, Julian wrote:
>   @property
>   string root_dir() {
>       static string cache;
>       static bool isInit = false;
>       if (!isInit) {
>           isInit = true;
>           cache = dirName(thisExePath());
>       }
>       return cache;
>   }

Shorter:

   string root_dir() {
       static string cache;
       return cache ? cache : (cache = dirName(thisExePath()));
   }

This might spam readlink() syscalls if they somehow return the 
empty string,
but how would that even happen...