45300aad3c
For backwards compatibility reasons the `ptrauth_qualifier` and `ptrauth_intrinsic` features need to be testable with `__has_feature()` on Apple platforms, but for other platforms this backwards compatibility issue does not exist. This PR resolves these issues by making the `ptrauth_qualifier` and `ptrauth_intrinsic` tests conditional upon a darwin target. This also allows us to revert the ptrauth_qualifier check from an extension to a feature test again, as is required on these platforms. At the same time we introduce a new predefined macro `__PTRAUTH__` that answers the same question as `__has_feature(ptrauth_qualifier)` and `__has_feature(ptrauth_intrinsic)` as those tests are synonymous and only exist separately for compatibility reasons. The requirement to test for the `__PTRAUTH__` macro also resolves the hazard presented by mixing the `ptrauth_qualifier` flag (that impacts ABI and security policies) with `-pedantics-errors`, which makes `__has_extension` return false for all extensions. --------- Co-authored-by: Aaron Ballman <aaron@aaronballman.com> (cherry picked from commit 624b724ca6df5d2d3ea16b9ed232851e5d061be4)
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