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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 . A prototype for this exists in the fir-dev branch and should be upstreamed in the hopefully near future). However, even a flang built from the fir-dev branch is not currently capable of compiling a hello world on windows on arm. Current progress towards that goal is tracked in Jira.