[release/8.0] Fix compilation of runtime with Xcode 16 #112208
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jeffschwMSFT
approved these changes
Feb 5, 2025
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Backport of #106744, #106442, and #111530 to release/8.0
Ref: dotnet/sdk#46006 (comment)
Customer Impact
Apple build tools (Xcode) are updated annually. Customers are expected to use up to date version to build applications, which is often enforced through policies on Apple systems and tooling (eg. uploading to App Store or signing and notarizing may enforce minimum Xcode version necessary for building apps). Xcode 16 started enforcing restriction on correct layout of unwinding information in relation to publicly exported symbols. In order to allow compilation with the new tooling we need to mark some of the runtime symbols with .alt_entry to signify they are not function entrypoints but rather just labels pointing at specific instruction in a given function.
Regression
Testing
The runtime repository was built on Apple machine with Xcode 16.2 and it no longer produces compilation errors and linker warning. NativeAOT smoke tests were used to verify that the code still links and runs as it should.
Risk
Low