[release/10.0] clang-21 on macos fixes#126319
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[release/10.0] clang-21 on macos fixes#126319github-actions[bot] wants to merge 9 commits intorelease/10.0from
github-actions[bot] wants to merge 9 commits intorelease/10.0from
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Addresses various build failures when compiling with the latest Xcode. ``` % clang --version Apple clang version 21.0.0 (clang-2100.0.123.102) Target: arm64-apple-darwin25.4.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin ```
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
…meter type in SSLSetALPNProtocol
…acceptableIssuers in AppleCryptoNative_NwConnectionCreate
…geLength in SwiftErrorHandling
AaronRobinsonMSFT
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akoeplinger
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Mar 30, 2026
jkotas
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Mar 30, 2026
am11
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This was referenced Mar 30, 2026
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Backport of #126235 to release/10.0
/cc @AaronRobinsonMSFT
Customer Impact
Updating Xcode moved to clang 21 and introduced some breaking changes during compilation of C and Swift sources.
Customer mention #119706 (comment)
Clang 21 changes for
-Wc++-keyword- https://releases.llvm.org/21.1.0/tools/clang/docs/ReleaseNotes.html#id11Partially related unicode-org/icu#2913
Regression
This is not a dotnet/runtime regression.
Testing
Infrastructure changes (that is, tool chain). All tests pass.
Risk
Low.