Linking tests with SwiftWasm 5.5 snapshots requires additional linker flags

[MaxDesiatov]

Currently tests fail to build without additional flags passed to swift build when using wasm-5.5-SNAPSHOT-2021-11-16-a toolchain. The required flags are -Xlinker -licuuc -Xlinker -licui18n, there weren't previously needed with SwiftWasm 5.4.

Without them we get these linker errors:

wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFRegularExpression.c.obj): undefined symbol: uregex_useAnchoringBounds_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFRegularExpression.c.obj): undefined symbol: uregex_close_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFRegularExpression.c.obj): undefined symbol: uregex_close_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFStringTransform.c.obj): undefined symbol: utrans_trans_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFStringTransform.c.obj): undefined symbol: utrans_close_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFStringTransform.c.obj): undefined symbol: utrans_openU_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFStringTransform.c.obj): undefined symbol: utrans_openU_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFStringTransform.c.obj): undefined symbol: utrans_openU_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFStringTransform.c.obj): undefined symbol: utrans_openU_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFStringTransform.c.obj): undefined symbol: utrans_close_64
wasm-ld: error: /Users/maxd/Library/Developer/Toolchains/swift-wasm-5.5-SNAPSHOT-2021-11-16-a.xctoolchain
/usr/lib/swift_static/wasi/libFoundation.a(CFStringTransform.c.obj): undefined symbol: utrans_close_64
...

[MaxDesiatov]

@kateinoigakukun could this be related to recent autolinking changes?

[MaxDesiatov]

Ah, this could be one of the manifestations of #3707, right?

[kateinoigakukun]

@MaxDesiatov 5.5 branch doesn't have -public-autolink-library feature. It's only available in main branch, so this issue is not fixed in 5.5 toolchain.

[MaxDesiatov]

Ok, since I can easily work around this by passing these flags in carton, I'm not going to dig into it just for 5.5. But will keep the issue open for posterity, at least until we release 5.6 or whatever the next version, just to make sure it's fixed in those later versions.