[release/6.0][mono] Fix iOS/tvOS build with Xcode 14 #76448
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Before Xcode 14 the `objc_super` struct definition in the SDK headers looked like this:
```
#if !defined(__cplusplus) && !__OBJC2__
/* For compatibility with old objc-runtime.h header */
__unsafe_unretained _Nonnull Class class;
#else
__unsafe_unretained _Nonnull Class super_class;
#endif
```
With Xcode 14 however the iOS/tvOS SDK header was changed to only define `super_class`, but the MacOSX SDK stayed the same.
Added CMake detection of this case so we can compile both on older and newer Xcode SDKs across platforms.
(cherry picked from commit d6f4ee1)
# Conflicts:
# src/mono/cmake/config.h.in
akoeplinger
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vargaz
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steveisok
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Sep 30, 2022
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@carlossanlop since this is a build change, I think it can go right in after CI completes. Can you merge it for us? |
lambdageek
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Sep 30, 2022
rbhanda
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Approved, signed off, CI green. No OOB package authoring changes needed. Ready to merge. |
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Backport of #76433 to release/6.0
Customer Impact
This impacts our official build, without it we can't build iOS/tvOS with Xcode 14 as soon as it rolls out to AzDO.
Testing
Local tests with Xcode 14 confirmed it fixes the issue.
Risk
Low.
IMPORTANT: Is this backport for a servicing release? If so and this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.