llvm dev - Jul 2012 - [LLVMdev] Linkage error in simple call graph pass?

Evening All,

So I need a call graph pass and having done several other passes, I went to work
on a simple pass, inheriting from CallGraphSCCPass.

However, while I was quickly able to build the pass, when I went to run it I got
the following:

opt -load ../Passes/HierchalFunctions/Hierchal/hierchal.dylib -hierchal <
hello.bc > /dev/null
Error opening '../Passes/HierchalFunctions/Hierchal/hierchal.dylib':
dlopen(../Passes/HierchalFunctions/Hierchal/hierchal.dylib, 9): Symbol not
found: __ZTIN4llvm16CallGraphSCCPassE
  Referenced from:
/Users/jcarlson/Software/LLDB/Passes/HierchalFunctions/Hierchal/hierchal.dylib
  Expected in: flat namespace
 in
/Users/jcarlson/Software/LLDB/Passes/HierchalFunctions/Hierchal/hierchal.dylib
  -load request ignored.
opt: Unknown command line argument '-hierchal'.  Try: 'opt
-help'
opt: Did you mean '-verify'?

It was suggested that I might have forgotten to link in the ipa lib so I tried
to modify my cmakelists and then even ran by hand:

 /usr/local/bin/clang++   -dynamiclib -Wl,-headerpad_max_install_names
-Wl,-flat_namespace -Wl,-undefined -Wl,suppress   -o hierchal.dylib
-install_name
/Users/jcarlson/Software/LLDB/Passes/HierchalFunctions/Hierchal/hierchal.dylib
CMakeFiles/hierchal.dir/Hierchal.o -L/usr/local/lib -lLLVMipa -lLLVMAnalysis
-lLLVMTarget -lLLVMCore -lLLVMMC -lLLVMObject -lLLVMSupport -lpthread

When I run otool -l on the dylib I get:

otool -L hierchal.dylib 
hierchal.dylib:
	/Users/jcarlson/Software/LLDB/Passes/HierchalFunctions/Hierchal/hierchal.dylib
(compatibility version 0.0.0, current version 0.0.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version
159.1.0)
	/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version
52.0.0)

I have the feeling I'm just missing something simple but I've been
banging my head on this for a bit now…  Any suggestions?

Thanks,

- Jared


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Jared Carlson <jared.carlson23 <at> gmail.com> writes:

> opt -load ../Passes/HierchalFunctions/Hierchal/hierchal.dylib -hierchal 
> < hello.bc > /dev/null
> Error opening
'../Passes/HierchalFunctions/Hierchal/hierchal.dylib':
> dlopen(../Passes/HierchalFunctions/Hierchal/hierchal.dylib, 9): 
> Symbol not found: 
__ZTIN4llvm16CallGraphSCCPassE
>   Referenced from: 
>   /Users/jcarlson/Software/LLDB/Passes/
>          HierchalFunctions/Hierchal/hierchal.dylib
>   Expected in: flat namespace
>  in /Users/jcarlson/Software/LLDB/Passes/
>         HierchalFunctions/Hierchal/hierchal.dylib
>   -load request ignored.
> opt: Unknown command line argument '-hierchal'.  Try: 'opt
-help'
> opt: Did you mean '-verify'?
> 
Alright... so I must have built without something...  the symbol isn't 
there in the libs, so I'm assuming a flag of some sort wasn't set...  
I did a grep in the libs for the exact and related symbols and I've 
got the right libs...


$grep -l ZTIN4llvm16CallGraphSCCPassE *

... "nothing"...

$ grep -l llvm16CallGraphSCCPassE *
libLLVMipa.a
libLLVMipo.a
libLTO.dylib

Just going to close the loop here... the issue was that CMake build obscured
RTTI
and exceptions being on..  Check out the CXX_FLAGS for opt in the source tree 
and everything works out.