Making a DLL with clang

[LB]

I'm trying to make a DLL with clang. I'm following a tutorial for MinGW (because I am using the version of clang for MinGW) and it stops at a linker error.

My Test.cpp:

void __declspec(dllexport) f()
{
}

I am invoking clang as:

clang++ -v -std=c++11 -shared -o Test.dll -Wl,--out-implib,libTest.lib Test.cpp

When I build I get this https://gist.github.com/LB--/4728067
(Speficially, Cannot export __Z1fv: symbol not found)

Edit: if I wrap it in extern "C" then it has the same error but with _f