gdb shows only disassembler when debugging using Qt5 kit on Mac

Steps to reproduce:

• open/create a Qt application (Qt Console/Qt Gui does not matter)
• configure and assign Qt4 and Qt5 kit for this project
• set a breakpoint in main()
• debug with Qt4 kit - breakpoint is hit, code of main() is displayed as expected, stop debugging
• select Qt5-kit for debugging, start debugging

Current result:

• when breakpoint is hit, disassembler for this code is displayed

Expected result:

• debugger shows code as it does for Qt4

Note: tested with Qt5.0.1 and Qt5.1.0rc as kits Qt version.