[LLVMdev] Pass options to the linker

[Duncan Sands]

Hi Jorge,

> I'm trying to use the PPL (Parma Polyhedra Library,
> bugseng.com/products/ppl) in one of my LLVM passes getting the error:
>
>> Error opening
>> '/home/jorge/SvnReps/Systems/llvm/build/Debug+Asserts/lib/MyAnalysis.so':
>> /home/jorge/SvnReps/Systems/llvm/build/Debug+Asserts/lib/MyAnalysis.so:
>> undefined symbol: _ZNK23Parma_Polyhedra_Library13PIP_Tree_Node2OKEv
>> -load request ignored.

was MyAnalysis.so linked with the PPL library?  Run
   ldd MyAnalysis.so
to see what it was linked with.

Ciao, Duncan.

>
> Let me explain how I get to this point.
>
> To make simpler my explanation I took the "Hello World" pass provided
> in the directory llvm/lib/Transforms/Hello/Hello.cpp.
>
> I compiled Hello.cpp using the Makefile:
>
>> LEVEL=../../../..
>> LIBRARYNAME=MyAnalysis
>> LOADABLE_MODULE=1
>> SHARED_LIBRARY=1
>> include $(LEVEL)/Makefile.common
>
> and then:
>
> clang test.c -c -emit-llvm -o test.bc
> opt -load /home/jorge/SvnReps/Systems/llvm/build/Debug+Asserts/lib/MyAnalysis.so -hello -stats test.bc
>
>> Hello: modulo
>> ===-------------------------------------------------------------------------===
>>                            ... Statistics Collected ...
>> ===-------------------------------------------------------------------------===
>> 1 hello - Counts number of functions greeted
>
> So far, so good. No compiler/linker errors and I get the expected
> output.
>
> Now, in order to use PPL from my Hello pass I just need (based on PPL
> documentation) to add in Hello.cpp the header:
>
> #include<ppl.hh>
>
> and then I modify the above Makefile as follows:
>
>> LEVEL=../../../..
>> LIBRARYNAME=MyAnalysis
>> LOADABLE_MODULE=1
>> SHARED_LIBRARY=1
>> include $(LEVEL)/Makefile.common
>
>> # These two lines are new:
>> CXX.Flags += -I/home/jorge/include -fexceptions -Wno-variadic-macros
>> LD.Flags  += -L/home/jorge/lib -lppl -lgmp
>
> Then, it's when I get the above error:
>
>> Error opening
>> '/home/jorge/SvnReps/Systems/llvm/build/Debug+Asserts/lib/MyAnalysis.so':
>> /home/jorge/SvnReps/Systems/llvm/build/Debug+Asserts/lib/MyAnalysis.so:
>   >undefined symbol: _ZNK23Parma_Polyhedra_Library13PIP_Tree_Node2OKEv
>
> It's important to mention that I can compile/link programs with the
> header "#include<ppl.hh>" without any problem using the command:
>
> g++ test.c -L/home/jorge/lib -lppl -lgmp -o test
>
> I guess the problem is how I pass the flags to the linker.  Does
> anybody have a clue what I'm doing wrong?
>
> Thanks!
>
> Jorge
>
>
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