[LLVMdev] debugging LLVM generated executables???
oskin at cs.washington.edu
Tue May 6 09:36:31 CDT 2008
> 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
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
Any other suggestions out there?
> 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.
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
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