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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.
Polly - Polyhedral optimizations for LLVM ----------------------------------------- http://polly.llvm.org/ Polly uses a mathematical representation, the polyhedral model, to represent and transform loops and other control flow structures. Using an abstract representation it is possible to reason about transformations in a more general way and to use highly optimized linear programming libraries to figure out the optimal loop structure. These transformations can be used to do constant propagation through arrays, remove dead loop iterations, optimize loops for cache locality, optimize arrays, apply advanced automatic parallelization, drive vectorization, or they can be used to do software pipelining.