Duncan,
I am not sure that even if you answer these questions that I can help,
but I'll try.
How did you start gdb? What commands? Exactly what process did you
attach to? What is in xcode and what is not?
How exactly are you trying to set the break point? And what does gdb
respond with when you set it from the command line?
Was anything compiled from xcode?
Was rgl.so compiled with debug symbols turned on?
Was X11gui compiled with debug symbols turned on?
Xcode integration with gdb is a complicated situation. Just because
xcode can see something does not really mean that gdb can see it,
although it usually works with Apple magic. Are you indicating that
gdb can see the source file or that xcode can see the source file?
Running x11, R, and rgl all in debug mode would seem a real
challenge. Not being an x11 expert, I would also raise the question
with people familiar with X11 debugging in Mac OS X. I would start
with breakpoints only in rgl.so (which is probably what you are trying
to do) and not x11gui.cpp:300.
You might want to run gdb without xcode and see what's going on.
You'll have to wade through a bunch of command line stuff, but you do
get direct feedback without it being absorbed by xcode.
Neil
On Jul 8, 2009, at 8:53 AM, Duncan Murdoch wrote:
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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