- investigate how minimal Cocoa application looks like -
it is enough to display "Hello world" in otherwise emtpy window
(view?), preferably without the presence of .nib files
1. build the minimal app is easy, gcc on Mac knows
how to handle and link the file types without
any unusual flags (although one can get fancy and
specify architectures for "universal binaries" etc.)
The following command works, to mix a C main file
have it start an objective-C Cocoa application: