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I assume it's from incremental compilation, because I don't know how a normal compile could do this.
I have a case where somehow (I think a failed or cancelled compile) an old version of a .swiftmodule
was uploaded to the remote cache. For example, I have an action that sets these env variables:
"environmentVariables": [{
"name": "APPLE_SDK_PLATFORM",
"value": "MacOSX"
}, {
"name": "APPLE_SDK_VERSION_OVERRIDE",
"value": "14.2"
}, {
"name": "SWIFT_AVOID_WARNING_USING_OLD_DRIVER",
"value": "1"
}, {
"name": "XCODE_VERSION_OVERRIDE",
"value": "15.1.0.15C5042i"
}]
but I'm getting back a .swiftmodule
from the remote cache that was compiled against macOS SDK 14.0:
/Users/brentley/Developer/rules_xcodeproj/tools/generators/lib/PBXProj/src/Dictionary+Extensions.swift:1:8: Cannot load module 'OrderedCollections' built with SDK 'macosx14.0' when using SDK 'macosx14.2': /Users/brentley/Developer/rules_xcodeproj/bazel-output-base/rules_xcodeproj.noindex/build_output_base/execroot/_main/bazel-out/macos-arm64-min13.0-applebin_macos-darwin_arm64-dbg-ST-95054d4cebee/bin/external/_main~non_module_deps~com_github_apple_swift_collections/OrderedCollections.swiftmodule
I feel there is an edge case in the incremental compilation support that could allow something like this to happen (because it has old versions laying around).
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