Miscellaneous fixes for Wasm platform toward SwiftPM integration#998

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kateinoigakukun wants to merge 6 commits intoswiftlang:mainfrom

kateinoigakukun:yt/fix-wasm-sdk

Commits on Dec 26, 2025

SwiftSDK: Support specifying metadata JSON path as an artifact variant
kateinoigakukun
committed
SwiftSDK: Fix default Swift SDKs directory to respect XDG_CONFIG_HOME on non-macOS
kateinoigakukun
committed
Wasm: Remove obsolete linker flags hacks now that swiftc linker driver is supported
kateinoigakukun
committed
Wasm: Pass `-resource-dir` to linker driver
kateinoigakukun
committed
Wasm: Override SWIFTC_SDKROOT_LINKER_INPUT to use `-sdk` over `-sysroot` for now
kateinoigakukun
committed
SWBCore: Impose SDKROOT only if SDK is available
kateinoigakukun
committed