rmathew proposed a patch following our discussion. It solved my SWT crashing issue and made its way to gcc trunk. Helping fixing this bug was a rather enjoyable experience, and remembered me how much I liked assembly language and low-level issues.

Anyway, a canonical SWT "HelloWorld" now works properly, as well as the tray variation I've initially chosen as a simple example.

Now that this code compiles and runs properly, I'm focusing on its packaging. NSIS seems like an obvious choice, but I'd first like to "clean" my compiled app.

Indeed, I'm kind of surprised by its size; this basic example weights 52MB. Stripping it and compressing it with the excellent UPX leads to a 4MB executable, but it still does feel like an awful lot. Perhaps some code analysis could remove unneeded parts? I'll have to goggle about this.