I feel it has little advantage to push out a nightly build
No, nightly please, the code is a bit unstable on windows...
I'm not sure what should I do on windows about the autodetection:
1. Probably should do something like the compiler
2. I can hardcode c:\mingw\bin\gdb.exe
3. Get the default bin directory of gcc
4. Something else
Probably 3 is the best choice, what do you think?