On Thu, Apr 6, 2017 at 7:50 PM, Vasco Alexandre da Silva Costa <
vasco.co...@gmail.com> wrote:
>
> On Thu, Apr 6, 2017 at 2:51 PM, Marco Domingues <
> marcodomingue...@gmail.com> wrote:
>
>> I’m trying to use ‘gdb’ to debug an OpenCL kernel but I’m having trouble
>> using the command: (gdb) break filename:linenum
>>
>> My idea was to set a breakpoint in the function “clEnqueueNDRangeKernel”
>> (in src/librt/primitives/primitive_util.c) because I read online that
>> kernels are only visible to ‘gdb’ after they are compiled.
>>
>
> It is probably worse than that. The kernels likely are only visible after
> they're both compiled and linked.
>
>
>> But when I run the following commands inside the brlcad main directory:
>>
>> $ gdb --args build/bin/mged build/bool.g
>> (gdb) b src/librt/primitives/primitive_util.c:1063
>>
>> I get “no source file named src/librt/primitives/primitive_util.c”, even
>> when i try to specify the full path to the file
>>
>> Maybe someone that have used ‘gdb’ with brlcad before could point me what
>> is missing?
>>
>
> There's another thing you can do, other than set a breakpoint. You can
> emit an interrupt in the code (e.g. with kill(0, SIGINT)). Then the
> executable will stop. Then you can just use the 'continue' command. Or just
> hit CTRL-C in the middle of execution. Assuming the code takes long enough
> to run that you can do it...
>
> Still, if you want to debug the raytracer backend, it is not 'mged' you
> want to debug. What you want to debug is the 'rt' command. 'mged' is just a
> graphic interface that IIRC has no rendering code in it. That's probably
> why you can't set the breakpoint in the first place. The code isn't in
> 'mged'. One good way to check this out, assuming you compiled with debug
> symbols, is to run 'ldd build/bin/mged' and see if 'librt.so' shows up in
> the list of linked libraries.
>
> If you can also a list of the debug symbols in an executable or a library
> with the 'nm' command. e.g. 'nm -S build/bin/mged'.
>
PS: Of course what I meant to say was:
You can also list the debug symbols in an executable or library with the
'nm' command. e.g. 'nm -S build/bin/mged'.
Heh,
--
Vasco Alexandre da Silva Costa
PhD in Computer Engineering (Computer Graphics)
Instituto Superior Técnico/University of Lisbon, Portugal
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