Dll support: testers needed

[Benjamin Thaut]

I'm currently back on dll support and I'm applying finishing touches to 
my dll support PR. Now I want to know if I missed any corner cases and 
it would be great if a few more people gave the dll support a try.

-To try it out you will need to build dmd, druntime and phobos yourself. 
I'm not going to provide a binary distribution.
-You will need to target the microsoft linker. E.g. either use -m64 or 
-m32mscoff when compiling your programs.
-be warned, the state of the dll support is not final and subject to 
change. There is no garantuee that there won't be any breaking changes 
to dll support.

You can find a quick start guide here: 
http://stuff.benjamin-thaut.de/D/getting_started.html
If you need more information and examples take a look here: 
https://github.com/Ingrater/DIPs/blob/ReviveDIP45/DIPs/DIP45.md

Not all of phobos/druntime has correct export annotations yet as this is 
not the goal of my initial pull request. If you use a function from 
druntime/phobos that does not have a correct export annotation you will 
get a linker error. I'm not interrested in those. I'm interrested in 
cases where export is correctly used and you will still get linker 
errors / incorrect program behavior. So if you encounter a linker error 
first check if the declaration has a export annotation or not. Try 
adding it and see if the error goes away. If it does not go away, report 
it here or send me an e-mail to code at benjamin-thaut.de

If you find anything, small repro cases would be appreciated as it makes 
my life a lot easier.

-- 
Kind Regards
Benjamin Thaut