Undefined reference while linking with 3.8 and GCC5

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1

I'm getting these errors while linking my project now (being migrated
from 3.3 to 3.8, now using GCC5):

    build/libleaf_ir_llvm.so: undefined reference to `typeinfo for
llvm::Value'
    build/libleaf_ir_llvm.so: undefined reference to `typeinfo for
llvm::CmpInst'
    build/libleaf_ir_llvm.so: undefined reference to `typeinfo for
llvm::Instruction'
    build/libleaf_ir_llvm.so: undefined reference to `typeinfo for
llvm::Function'
    build/libleaf_ir_llvm.so: undefined reference to `typeinfo for
llvm::UnaryInstruction'

I'm presuming my linking is basically correct otherwise I'd get hundreds
of undefined references. Am I perhaps using a constructor that isn't
being provided anymore?

I built LLVM with this command:

    cmake .. -DENABLE_EH=ON -DENABLE_RTTI=ON -DLLVM_ENABLE_CXX1Y=ON
-DLLVM_LINK_LLVM_DYLIB=ON -DLLVM_ENABLE_FFI=ON
-DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_BUILD_DOCS=ON
-DLLVM_ENABLE_DOXYGEN=ON -DLLVM_OPTIMIZED_TABLEGEN=ON
-DCMAKE_INSTALL_PREFIX="/opt/llvm/install"

And I link to the installed LLVM-3-8.so

2

I think my ENABLE_RTTI flag might not be correct/enough. I'm trying
again with LLVM_REQUIRES_RTTI.