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lc0 builds with -march=native, which can lead to Illegal instruction on docker hosts #5

@Simske

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@Simske

Easiest solution: use old anoth architecture that most machines can run it (e.g. -march=broadwell).

Alternatively: compile multiple versions with different -march, choose on runtime.

-march=native is set in meson.build line 41 in lc0 source

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