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
507d1856cc