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Ignore prebuilt module cache when building the prebuilt module cache #1649

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Merged
merged 1 commit into from
Jul 7, 2024
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Ignore prebuilt module cache when building the prebuilt module cache #1649

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12 changes: 12 additions & 0 deletions Sources/swift-build-sdk-interfaces/main.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -157,6 +157,18 @@ do {
try localFileSystem.createDirectory(mcpPath, recursive: true)
}
}

// When building modules for an SDK, ignore any existing prebuilt modules.
// modules. Do so by passing an intentially-bad path for the prebuilt
// module cache path that's derived from the output path (but not the same
// as that path). This prohibits the frontend scanning job from adding the
// default prebuilt module cache path, while ensuring that we find no
// prebuilt modules during this scan.
args.append("-Xfrontend")
args.append("-prebuilt-module-cache-path")
args.append("-Xfrontend")
args.append(outputDir.appending(component: "__nonexistent__").pathString)

let baselineABIDir = try getArgumentAsPath("-baseline-abi-dir")
var driver = try Driver(args: args,
diagnosticsOutput: .engine(diagnosticsEngine),
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