[clang][unittests] Fix linker error for DirectoryWatcherTest with CLANG_LINK_CLANG_DYLIB (#178455) Move clangDirectoryWatcher from LINK_LIBS to CLANG_LIBS so it gets replaced by clang-cpp when building with CLANG_LINK_CLANG_DYLIB=ON. When using both CLANG_LINK_CLANG_DYLIB=ON and LLVM_ENABLE_LTO=Thin, the test would fail with: ld.lld: error: undefined symbol: clang::DirectoryWatcher::create(llvm::StringRef, std::function<void (llvm::ArrayRef This happens because clangDirectoryWatcher was being linked as a separate library alongside clang-cpp (which already contains clangDirectoryWatcher), causing duplicate symbol issues with LTO. The fix correctly categorizes: - clangDirectoryWatcher → CLANG_LIBS (Clang library, bundled in clang-cpp) - LLVMTestingSupport → LINK_LIBS (LLVM library, always linked directly) #178302
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