[Interest] Debugging on Mac OS X
paulf at free.fr
Sat Feb 23 20:27:07 CET 2013
Thanks for the quick reply (as ever).
On 23 Feb 2013, at 18:34, Thiago Macieira wrote:
> On sábado, 23 de fevereiro de 2013 18.29.31, Paul Floyd wrote:
>> 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?
> How did you enable the debug libraries? Did you set DYLD_IMAGE_SUFFIX?
Yes, via Qt Creator.
> I've also been told you should try lldb instead of gdb. Also, if you have
> Apple clang 3.2, it means you don't have the latest XCode. Can you try to
This is clang from llvm.org. Apple clang 4.2 is included with XCode, which won't install on OS X 10.6. The clang in XCode 4.0 is clang 2.0
I'll try lldb.
> Does this problem happen on later versions of Mac OS X?
I don't have access to a later version (I could upgrade to 10.7 with some effort).
>> In the Qt 5 version of the same code (hastily ported), I get a lockup
>> earlier, in a call to QFileDialog::getExistingDirectory. The callstack
> Is that the entire backtrace? It contains no Qt frames there, so it doesn't
> help me.
It's the top 3 elements. The (almost) full stack is:
0 mach_msg_trap 0x1022e0e3a
1 mach_msg 0x1022e15ef
2 __CFRunLoopRun 0x7fff8a4fd902
3 CFRunLoopRunSpecific 0x7fff8a4fcd8f
4 RunCurrentEventLoopInMode 0x7fff88cea7ee
5 ReceiveNextEventCommon 0x7fff88cea5f3
6 BlockUntilNextEventMatchingListInMode 0x7fff88cea4ac
7 _DPSNextEvent 0x7fff890b0eb2
8 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] 0x7fff890b0801
9 -[NSApplication _realDoModalLoop:peek:] 0x7fff892ebdc3
10 -[NSApplication runModalForWindow:] 0x7fff892e9951
11 -[NSSavePanel runModal] 0x7fff8954f112
12 -[QNSOpenSavePanelDelegate runApplicationModalPanel] 0x103444e17
13 QCocoaFileDialogHelper::exec 0x103448bac
14 QDialog::exec 0x10052ee7f
15 QFileDialog::getExistingDirectory 0x10053c440
16 EngineeringDataModel::LoadAll TableModel.cpp 17 0x100033694
17 EngineeringDataModel::EngineeringDataModel TableModel.h 22 0x100028761
18 EngineeringDataModel::EngineeringDataModel TableModel.h 23 0x100019b75
19 MainWindow::MainWindow mainwindow.cpp 41 0x100006036
20 MainWindow::MainWindow mainwindow.cpp 156 0x100005f9d
> Also note that Mac OS X 10.6 is not a valid development target for Qt 5. You
> have to develop on 10.7 or 10.8, but you can deploy (and debug) there.
OK, but I shouldn't have problems with Qt 4.8., right?
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