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Various build tools may produce command lines invoking clang-cl and lld-link which contain /link twice like so: e.g. `clang-cl.exe sanitycheckcpp.cc /Fesanitycheckcpp.exe .... /link /link ...` If link.exe is used, it ignores the extra `/link` and just issues a warning, however lld-link tries to treat `/link` as a file name. This PR adds a flag which is ignored in order to improve compatibility with link.exe There's some extra context including an "in-the-wild" example and reproducer of the problem here: https://github.com/frankier/meson_clang_win_activation Co-authored-by: Frankie Robertson <frankie@robertson.name>