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You will have to add flang, clang and mlir to the list of enabled projects.
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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. 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. Part of the issue is that the flang driver does not add all the runtime libraries needed on Windows. Current progress towards that goal
We are naturally working hard towards getting upstream flang to work on Windows on Arm in the cleanest way possible. In the meantime, if you would like to try a version that can compile a simple ‘hello world’, you can build from this (slightly hacky) branch. Note that you will also need clang for some of the steps, as detailed in this example script.
Current progress for flang on Windows on Arm is tracked in Jira.