[LLVMdev] debugging LLVM generated executables???

[Mark Oskin]

> I think you probably need to pass -O0 to llvm-ld.  The link-time  
> optimizations are probably killing your debug info.
>
No dice.  Doing it this way makes gdb spew out this:

warning: Could not find object file "/var/folders/cQ/cQ+L3+RP2RWOpE 
+8ZNQdPU+++TI/-Tmp-//ccVljWhn.o" - no debug information available for  
"defs.h"

And then no debug symbols are available.

I also discovered a major down side to the "solution" I found last  
night.  While the line number data does get successfully transfered  
into gdb, I cannot inspect any variables.  Those appear to have been  
lost.

Any other suggestions out there?

thanks!

-mark

> --Owen
>
> On May 5, 2008, at 8:21 PM, Mark Oskin wrote:
>
>> Hi everyone again,
>>
>> I did discover the following works (see below).  However, does anyone
>> know of the "proper" way with LLVM?
>>
>> llvm-gcc -g -c -emit-llvm helloworld.c
>> opt -load=mypass.dylib -mypass < helloworld.o > helloworld-mypass.o
>> llc -fast -f -o helloworld.s helloworld-mypass.o
>> as -o helloworld-prime.o
>> gcc -o helloworld helloworld-prime.o
>> gdb helloworld
>>
>> On May 5, 2008, at 4:17 PM, Mark Oskin wrote:
>>
>>> Hi everyone,
>>>
>>> I have a question that seems simple, but has been confounding me for
>>> several hours.  I'd like to debug a binary produced with LLVM.  For
>>> the life of me, I can't get any symbols into gdb and llvm-db won't
>>> even start the program nor load any useful information about it.
>>> Here's my current strategy (which isn't working):
>>>
>>> llvm-gcc -g -O0 -c -emit-llvm helloworld.c
>>> opt -load=mypass.dylib -mypass < helloworld.o > helloworld-mypass.o
>>> llvm-ld -native -o helloworld helloworld-mypass.o
>>> gdb helloworld
>>>
>>> I've tried several variations on the above.
>>>
>>> Any suggestions?
>>>
>>> Note, what is critical about the whole thing is I must run  
>>> "mypass" on
>>> the bytecode file.  I'm hoping there's an easy fix, that will both
>>> allow me to run my arbitrary pass, and debug a program.
>>>
>>> thanks,
>>>
>>> -Mark
>>> _______________________________________________
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>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
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