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If Polly is built with LLVM_POLLY_LINK_INTO_TOOLS=ON (the default for monorepo builds), then Polly will become a dependency of the LLVMExtensions component, which is part of LLVMExports. As such, all the Polly libraries also have to be part of LLVMExports. However, if Polly is built with LLVM_POLLY_LINK_INTO_TOOLS=OFF, we also end up adding Polly libraries to LLVMExports. This is undesirable, as it adds a hard dependency from llvm on polly. Fix this by only exporting polly libraries from LLVMExports if LLVM_POLLY_LINK_INTO_TOOLS is enabled.