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COMPATIBLE_MACHINE is used to forbid the use of a recipe or its packages for a specific set of machines. In some cases, it may make more sense to have the logic inverted and have the recipe always forbidden except for hand-picked machines. Such could be the case for pieces of software that only support some architectures. In that scenario, it is sometimes a bit easier on the eye and for maintenance to use the OVERRIDES mechanism but for that, a default should be set. COMPATIBLE_MACHINE:aarch64 = "^(aarch64)$" COMPATIBLE_MACHINE:mips64 = "^(mips64)$" wouldn't do much because if COMPATIBLE_MACHINE isn't set, the recipe is assumed compatible and therefore, if no default is provided we enter that case. Hence, we need to add COMPATIBLE_MACHINE = "^$" as default so that it only matches the empty string, which isn't possible for MACHINEOVERRIDES. Cc: Quentin Schulz <foss+yocto@0leil.net> (From yocto-docs rev: 52196d39bc85de267daffb0074eb59786751f57d) Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com> Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>