"How do I get the equivalent of -Wall?"
After you have specified MinGW as the compiler to use, and the appropriate platform (i.e. Windows application, console app, DLL, etc.) you will need to:
(a) Select "Build->Select compiler" and click on the "Edit configuration" button AFTER you have chosen "MinGW" from the list;
(b) There are several -W options to choose from, unfortunately -Wall is not among those. Look at how the other -W... options are handled and act accordingly.
Unfortunately, this is what happens when you try to define a universal interface for a virtually unlimited number of compilers. I personally think there would be a better design with XML configuration files, but the choice was made to use a prehistoric key/value (Windows INI-type) of configuration.
