[CMake] Prevent libraries from linking twice during LLVM build

Thu Apr 20 11:56:54 EDT 2017

Hello,

I'm proposing a patch to the Polly/LLVM project that involves linking
libPolly.a or libPolly.so to NVPTX back-end libraries. I'm currently using,
target_link_libraries(Polly
      LLVMNVPTXCodeGen
      LLVMNVPTXInfo
      LLVMNVPTXDesc
      LLVMNVPTXAsmPrinter
      )

The opt binary links to both Polly and NVPTX back-end libraries, therefore
including the back-end libraries twice which causes problems. Can linking
the libraries as an INTERFACE to Polly solve the problem ?

target_link_libraries(Polly INTERFACE
      LLVMNVPTXCodeGen
      LLVMNVPTXInfo
      LLVMNVPTXDesc
      LLVMNVPTXAsmPrinter
      )

Thank You,
Sanjay
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