Wasm: Use -sysroot value as the clang linker sysroot if provided
#2053
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For other Unix-like platforms, the driver already respects `-sysroot` over `-sdk` as the native sysroot (not Swift "SDK"). See the following PRs for reference: * swiftlang#1811 * swiftlang/swift#72352 For WebAssembly, this change makes the driver behave consistently with other platforms. This consistency is important for supporting swiftc as a swift-build's underlying linker driver for Wasm targets, as UnixLd.xcspec now uses `-sysroot` by default: https://github.com/swiftlang/swift-build/blob/02e9f6778b621375b5a5a2fe40f9a4b55bb44ba0/Sources/SWBGenericUnixPlatform/Specs/UnixLd.xcspec#L61-L68
kateinoigakukun
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…ot` for now The override is needed because swift-driver currently does not respect `-sysroot` for Wasm targets, but only `-sdk`. This will be fixed in swift-driver in the change: swiftlang/swift-driver#2053
kateinoigakukun
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Dec 26, 2025
…ot` for now The override is needed because swift-driver currently does not respect `-sysroot` for Wasm targets, but only `-sdk`. This will be fixed in swift-driver in the change: swiftlang/swift-driver#2053
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For other Unix-like platforms, the driver already respects
-sysrootover-sdkas the native sysroot (not Swift "SDK"). See the following PRs for reference:-sysrootflag for all non-Darwin Unix platforms, not just Android #1811-sysrootoption for non-Darwin targets swift#72352For WebAssembly, this change makes the driver behave consistently with other platforms. This consistency is important for supporting swiftc as a swift-build's underlying linker driver for Wasm targets, as UnixLd.xcspec now uses
-sysrootby default:https://github.com/swiftlang/swift-build/blob/02e9f6778b621375b5a5a2fe40f9a4b55bb44ba0/Sources/SWBGenericUnixPlatform/Specs/UnixLd.xcspec#L61-L68