cl -Wall -Zs

...would be a good place to start. You'll get more errors/warnings if you
remove -Zs (syntax check only) and let the compiler generate an OBJ file
since many warnings/errors are raised in the compiler back end.  You'll
frequently get warnings from an optimized build that you don't get from a
debug build as well.

If you have Visual Studio team system, you can use

cl -analyze

to do extensive static checking on the code.

-cd