bertrand@Virtual-Jessie:~$ debugapp ./GUITest.app/
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
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Reading symbols from /home/bertrand/GUITest.app/GUITest...done.
(gdb) run
Starting program: /home/bertrand/GUITest.app/GUITest 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff63cc500 in objc_msgSend_fpret ()
   from /usr/GNUstep/Local/Library/Libraries/libobjc.so.4.6
(gdb) backtrace
#0  0x00007ffff63cc500 in objc_msgSend_fpret ()
   from /usr/GNUstep/Local/Library/Libraries/libobjc.so.4.6
#1  0x00007ffff7504fd4 in +[NSGraphicsContext setCurrentContext:] (
    self=0x7ffff7a6fbe0 <_OBJC_CLASS_NSGraphicsContext>, 
    _cmd=0x7ffff7a1d170 <.objc_selector_list+576>, context=0xa26cf0)
    at NSGraphicsContext.m:169
#2  0x00007ffff7436468 in -[NSApplication _init] (self=0x994360, 
    _cmd=0x7ffff7a1dad0 <.objc_selector_list+2976>) at NSApplication.m:892
#3  0x00007ffff69f9461 in -[NSObject performSelector:withObject:] (self=0x994360, 
    _cmd=0x7ffff6f4bb50 <.objc_selector_list+832>, 
    aSelector=0x7ffff7a1dad0 <.objc_selector_list+2976>, anObject=0x994360)
    at NSObject.m:1808
#4  0x00007ffff6a85bf0 in -[NSObject(NSThreadPerformAdditions) performSelector:onThread:withObject:waitUntilDone:modes:] (self=0x994360, 
    _cmd=0x7ffff6f4ba50 <.objc_selector_list+576>, 
    aSelector=0x7ffff7a1dad0 <.objc_selector_list+2976>, aThread=0x789860, 
    anObject=0x994360, aFlag=1 '\001', anArray=0x8c99b0) at NSThread.m:1657
#5  0x00007ffff6a858d9 in -[NSObject(NSThreadPerformAdditions) performSelectorOnMainThread:withObject:waitUntilDone:modes:] (self=0x994360, 
    _cmd=0x7ffff6f4ba70 <.objc_selector_list+608>, 
    aSelector=0x7ffff7a1dad0 <.objc_selector_list+2976>, anObject=0x994360, 
    aFlag=1 '\001', anArray=0x8c99b0) at NSThread.m:1612
#6  0x00007ffff6a85951 in -[NSObject(NSThreadPerformAdditions) performSelectorOnMainThread:withObject:waitUntilDone:] (self=0x994360, 
    _cmd=0x7ffff7a1d310 <.objc_selector_list+992>, 
    aSelector=0x7ffff7a1dad0 <.objc_selector_list+2976>, anObject=0x994360, 
---Type <return> to continue, or q <return> to quit---
    aFlag=1 '\001') at NSThread.m:1623
#7  0x00007ffff7436a1d in -[NSApplication init] (self=0x994360, 
    _cmd=0x7ffff7a1d960 <.objc_selector_list+2608>) at NSApplication.m:978
#8  0x00007ffff7436273 in +[NSApplication sharedApplication] (
    self=0x7ffff7a1cae0 <_OBJC_CLASS_NSApplication>, 
    _cmd=0x6087f0 <.objc_selector_list+16>) at NSApplication.m:850
#9  0x0000000000400cfb in main () at guitest.m:6