Hello, i build LLVM on windows under Visual Studio 2019 with the config like this: cmake -S llvm\llvm -B build -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang;lld" ...

OpenCL comes as a runtime environment and has to be installed on your target machine, no matter if you are using Windows or Linux. For Mac OS X, OpenCL is already part of the system, so there is ...