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Depending on which revision of flang you’re building, you should now have one or both of f18.exe or flang-new.exe in %build_dir%/bin.
At the time of writing, clang version 13.0.0 is known to work for building flang. The flang binary obtained from main does not have support for code generation yet (although a prototype for this exists in the fir-dev branch and should be upstreamed in the hopefully near future).