Add support for target_feature cfgs #142
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This PR adds support for target-feature cfgs, by allowing users to specify the target features manually. As the gotchas page notes this is potentially unsafe, so I'm very open to suggestions on more automated / safer ways to do this.
My use case is a project that depends on the
sha
crate, which runs fine when I supply[ "sha" "sse2" ]
as targetFeatures.This fixes #136.