I am trying to debug on windows.
A simple hello world app compiled with
```
"c:\D\ldc2-1.38.0-windows-x64\bin\ldc2.exe" -gdwarf -O0 app.d
```
has debug symbols.
But the same app compiled with
```
dub build -b debug
--compiler="c:\D\ldc2-1.38.0-windows-x64\bin\ldc2.exe" --force
--root ../..
```
and dub.json
```
{
"name" : "testd1",
"description" : "Hello World - A minimal DUB bundle.",
"dependencies" : {
},
"dflags": ["-gdwarf", "-O0", "-d-debug"]
}
```
has NO debug symbols. gdb reports
```
Reading symbols from ./testd1.exe...
(No debugging symbols found in ./testd1.exe)
```
If add additional option `-vv` to `dflags` the it is visible that
ldc2 receives the `gdwarf` option. Probably the dub does some
thing wrong? Or I am wrong. :-(
