とりあえずFoundationリンクできないやつは治った https://github.com/swiftwasm/swift-corelibs-foundation/pull/143

[WASM] Restore lost _withStackOrHeapBuffer implementation by katein...

Resolve swiftwasm/swift#1824 (comment) $ swift build -c debug --build-tests --destination wasm32-unknown-wasi.json wasm-ld: error: /path/to/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-10-05-a/usr/lib/swi...