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> I only have an Ubuntu 20 install via WSL2 here to test, and using the default compilers there (clang 10 and gcc 9.3), things look pretty nice:

WSL2 is not that bad, but installing a real Linux in a VM takes about 10 minutes, so this seems a weird thing to say.

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WSL2 is a real Linux in a VM.

WSL2, afaik, runs modified Linux kernel (maintained by MS) on a modified Hyper-V. I would hardly call that a VM in traditional sense because it might introduce differences in behavior. However it is true that WSL2 uses virtualization technologies, so in that sense it is a VM. But calling it "a real Linux in a VM" is a stretch imho.

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