Cleanup __builtin_available where platform is now guaranteed on Apple platforms#122789
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vcsjones merged 2 commits intodotnet:mainfrom Jan 17, 2026
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Pull request overview
This PR removes unnecessary runtime platform version checks (__builtin_available) that are no longer needed now that the minimum supported Apple platform versions have been raised to macOS 12 and iOS/tvOS 13. This simplifies the code by eliminating conditional compilation paths for older platform versions that are no longer supported.
Key changes:
- Removes fallback code paths for older OS versions
- Unconditionally uses newer platform APIs that are now guaranteed to be available
- Simplifies control flow in several native implementation files
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| src/native/minipal/memorybarrierprocesswide.c | Removes macOS 10.14/iOS 12/tvOS 9 check and fallback thread state implementation, now always uses thread_get_register_pointer_values |
| src/native/libs/System.Security.Cryptography.Native.Apple/pal_sec.c | Removes iOS 11.3/tvOS 11.3 check, now always uses SecCopyErrorMessageString instead of fallback formatting |
| src/native/libs/System.Security.Cryptography.Native.Apple/pal_rsa.c | Removes macOS 10.15/iOS 13/tvOS 13 check, now always adds kSecUseDataProtectionKeychain to RSA key attributes |
| src/native/libs/System.Security.Cryptography.Native.Apple/pal_ecc.c | Removes macOS 10.15/iOS 13/tvOS 13 check, now always adds kSecUseDataProtectionKeychain to ECC key attributes |
| src/mono/mono/utils/mono-mmap.c | Removes macOS 11 check, now unconditionally sets MAP_JIT flag on ARM64 (non-Catalyst) |
| src/mono/mono/utils/mono-codeman.c | Removes macOS 11 checks in both mono_codeman_enable_write and mono_codeman_disable_write, now unconditionally manages JIT write protection |
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… platforms (#122789) We had a couple of places that were using `__builtin_available` to guard against some platform version features. Now that our Apple platform floor is macOS 12 and iOS/tvOS 13, we can remove some of them. Co-authored-by: Jeremy Barton <jbarton@microsoft.com>
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We had a couple of places that were using
__builtin_availableto guard against some platform version features. Now that our Apple platform floor is macOS 12 and iOS/tvOS 13, we can remove some of them.