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An empty expansion is possible, but as documented its effect is to disable the feature, so that isn't a good example. Instead, use the GCC implementation as the default: it's plausible that it could work even on compilers that don't advertise themselves as sufficiently GCC-like to define __GNUC__, and if not it gives users a concrete idea of what the macro is supposed to do. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>