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Pin xcode_swift_toolchain to a macOS execution platform #1886

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Pin xcode_swift_toolchain to a macOS execution platform #1886

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6 changes: 6 additions & 0 deletions swift/toolchains/xcode_swift_toolchain.bzl
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Expand Up @@ -1165,6 +1165,12 @@ for incremental compilation using a persistent mode.
},
),
doc = "Represents a Swift compiler toolchain provided by Xcode.",
# This toolchain requires Xcode and can only run on macOS. Without an
# explicit constraint, a build that lists non-mac execution platforms
# first (e.g. Linux remote executors for cross-compilation) resolves this
# rule to a non-mac execution platform, and `use_cc_toolchain()` then
# pairs the Xcode Swift toolchain with that platform's C++ toolchain.
exec_compatible_with = ["@platforms//os:macos"],
toolchains = use_cc_toolchain(),
fragments = [
"cpp",
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