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LLVM_VERSION_MAJOR
CMake variable as a directory property (l…
…lvm#83346) This allows users who include `llvm-project` as a subrepository to access the `LLVM_VERSION_MAJOR` variable on par with if they were relying on an installed LLVM and `FindLLVM.cmake`. They just need to do something like: ``` get_directory_property(LLVM_VERSION_MAJOR DIRECTORY "third_party/llvm-project/llvm" LLVM_VERSION_MAJOR) ``` Context: iree-org/iree#16606 -- like other projects with similar needs that I found by some googling, our work-around had been to rely on the CMake cached variable `CLANG_EXECUTABLE_VERSION`. Being cached, it over time inevitably ended up having a wrong value.
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