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RFC: https://discourse.llvm.org/t/rfc-cmake-linker-flags-need-wl-equivalent-for-intel-c-icx-on-windows/82446 The Intel C++ Compiler (ICX) passes linker flags through the driver unlike MSVC and clang-cl, and therefore needs them to be prefixed with `/Qoption,link` (the equivalent of `-Wl,` for gcc on *nix). Previous PRs did not catch this because I did not try building with `LLVM_BUILD_INSTRUMENTED=ON`. `CMAKE_CXX_LINKER_WRAPPER_FLAG` is empty for plain clang-cl (icx on windows behaves as clang-cl), so this is NFC for clang-cl.
See docs/CMake.html for instructions on how to build LLVM with CMake.