[LLVMdev] Help with the 'WritingAnLLVMPass' tutorial

[John Criswell]

On 7/9/14, 1:56 AM, Akhi Singhania wrote:
> Hi,
>
> I'm making my way through the WritingAnLLVMPass tutorial and hitting 
> the following issue.
>
> $ opt -load ../../../Debug+Asserts/lib/LLVMHello.so -hello < hello.bc 
> > /dev/null
> opt: symbol lookup error: ../../../Debug+Asserts/lib/LLVMHello.so: 
> undefined symbol: AnnotateHappensAfter

If AnnotateHappensAfter is from one of the LLVM libraries, then you must 
make sure your pass links with that library.  When you find the library 
that AnnotateHappensAfter lives in, be sure that library is included in 
the LINK_COMPONENTS or USED_LIBS variable in your Makefile.

That's what I suspect the problem is, anyway.

Regards,

John Criswell

>
> nm -g ../../../Debug+Asserts/lib/LLVMHello.so
>                  U AnnotateHappensAfter
> ...
>
> $ ldd ../../../Debug+Asserts/lib/LLVMHello.so
> linux-vdso.so.1 =>  (0x00007fffa87fe000)
> libz.so.1 => /lib64/libz.so.1 (0x00007f21b409e000)
> libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f21b3e80000)
> libtinfo.so.5 => /lib64/libtinfo.so.5 (0x00007f21b3c56000)
> libdl.so.2 => /lib64/libdl.so.2 (0x00007f21b3a52000)
> libm.so.6 => /lib64/libm.so.6 (0x00007f21b374a000)
> libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f21b3442000)
> libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f21b322c000)
> libc.so.6 => /lib64/libc.so.6 (0x00007f21b2e6c000)
> /lib64/ld-linux-x86-64.so.2 (0x0000003baaa00000)
>
> Am I not linking against some library I should have?
>
> Thanks,
> Akhi
>
>
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