[R-SIG-Mac] Debugging package code in Xcode?

Duncan Murdoch murdoch at stats.uwo.ca
Wed Jul 8 15:53:45 CEST 2009

Neil Tiffin wrote:
> You might research gdb fb command (future-break.)  It allows you to  
> set a breakpoint in code that is not loaded when the debugger is  
> started.  I believe you would have to use the debugger console not the  
> GUI with a syntax like "fb rgl.so:function_name".

But it is loaded when I want to set the breakpoint.  I can see the 
source file, set a breakpoint in it, but it doesn't work.  I opened the 
gdb console (thanks for the suggestion),  and I see warnings like

Warning - No location found for "x11gui.cpp:300"

when I try to set a breakpoint in rgl.  How do I tell it where to find 
the location corresponding to that file?

Duncan Murdoch
> On Jul 8, 2009, at 5:57 AM, Duncan Murdoch wrote:
>> I'd like to use Xcode to debug the rgl package, which is crashing  
>> sometimes in X11 on OSX.   In the past, I've done this for debugging  
>> R itself, and have a project set up for that.  I can attach to the  
>> process ID, and then I see rgl.so is loaded, but I can't see how to  
>> set a breakpoint in the rgl.so code.
>> Has anyone else done this before?  Can you point me to step-by-step  
>> instructions?
>> Duncan Murdoch
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