[Interest] Debugging on Mac OS X

[Paul Floyd]

Hi

I'm trying to build and run an app that a colleague wrote, without too much success. It works OK on Linux (and Windows, but I'm not certain of that).

I have
Mac OS X 10.6.8
XCode 4.0
clang 3.2
Qt 4.8.4 built with whatever compiler it chooses by default, probably GCC 4.2
Qt 5.0.1 built with clang 3.2, release only

With Qt 4.8.4 and g++ 4.2, it crashes in the call to QApplication::exec() with an abort(). Even with the debug version of Qt, I can't step into this code. Any ideas how I can debug this problem?

In the Qt 5 version of the same code (hastily ported), I get a lockup earlier, in a call to QFileDialog::getExistingDirectory. The callstack contains

mach_msg_trap
mach_msg
__CFRunLoopRun

The file dialog won't be dismissed with either OK or Cancel, but Command-Q does close the application. Again, any ideas what might be wrong?

TIA
Paul