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10ef20f6a6
While MLIR currently supports building a libMLIR.so, it does not support actually linking against it for its own tools. When building with LTO, this means we have to relink the world for every tool, and the resulting binaries are large. This adds basic support for MLIR_LINK_MLIR_DYLIB, modelled after how CLANG_LINK_CLANG_DYLIB is implemented: Libraries that are part of libMLIR.so should be added via mlir_target_link_libraries instead of target_link_libraries. This will replace them with libMLIR.so if MLIR_LINK_MLIR_DYLIB is enabled. This adds basic support, I think there are two more things that can be done here: * C API unit tests should link against libMLIR-C.so. Currently these still link statically. * Linking the test libs (not part of libMLIR.so) still pulls in dependencies statically that should come from libMLIR.so.