llvm dev - Dec 2014 - [LLVMdev] [LLVMDev] Undefined symbol with the basic hello world pass

Hi guys,

I had a pass written which was working fine earlier. I just tried to reuse
the pass, and now I see the following problem.

sandeep at ubuntu:~/llvm-3.2.src/lib/Transforms/Hello$ opt -load
../../../Release+Asserts/lib/Hello.so -help | grep hello
Error opening '../../../Release+Asserts/lib/Hello.so':
../../../Release+Asserts/lib/Hello.so: undefined symbol:
_ZN4llvm12FunctionPass16doInitializationERNS_6ModuleE
  -load request ignored.

To see if there is any problem with my pass, I replaced it with the simple
hello world pass from the
below LLVM tutorial but I still got the same issue.

http://llvm.org/releases/3.0/docs/WritingAnLLVMPass.html#quickstart

Can someone please help me with it? I can't figure out the issue here.

Thanks and regards,
Sandeep.
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Hi Sandeep,

On 7 December 2014 at 22:04, Sandeep K Chaudhary
<babbusandy2006 at gmail.com> wrote:
> sandeep at ubuntu:~/llvm-3.2.src/lib/Transforms/Hello$ opt -load
> [...]
> http://llvm.org/releases/3.0/docs/WritingAnLLVMPass.html#quickstart
>
> Can someone please help me with it? I can't figure out the issue here.
These are two different (and old) versions of LLVM, and it's not clear
that the "opt" you're using corresponds to either of them. The
HelloWorld pass you build must be loaded into the exact same version
of opt.

Cheers.

Tim.

Hi,

I know this is old. I was having the same issue and found no answer online,
so I thought I'd write for completeness sake.

The problem I had was that I was using the wrong version of opt,
 not the one for which I built the pass.
 That's why there's some symbols that mismatch.

Hope that helps someone in the future.

P.S: damn this formular is picky... 
you should format emails automatically if you don't like long lines...
I had to remove the rest of the thread for this by the way...

Cheers,

Andrés