Failed link with libswiftUnicodeDataTables

Related Projects Swift for WebAssembly
1

I'm trying to link wasm32-unknown-none-wasm/libswiftUnicodeDataTables.a to embedded web assembly executable target application.

something like this:

swift build -c release --product EmbeddedApp \
    --triple wasm32-unknown-none-wasm \
    -Xlinker -L -Xlinker ${SWIFT_TOOLCHAIN}/usr/lib/swift/embedded/wasm32-unknown-none-wasm -Xlinker -lswiftUnicodeDataTables

Unfortunately getting error.

Building for production...
error: link command failed with exit code 1 (use -v to see invocation)
wasm-ld: error: UnicodeData.cpp.o: section too large
clang: error: linker command failed with exit code 1 (use -v to see invocation)
[1/2] Linking EmbeddedApp.wasm
Fatal: Failed opening '.build/release/EmbeddedApp.wasm'

How I can overcome this error and make it link or should I file a bug report somewhere?

2

Unicode tables currently can't be linked on WebAssembly due to linker limitations. The recommended workaround is to avoid Unicode-related operations on String (e.g. its Equatable and Hashable conformances in String-backed enums and String keys of Dictionary) and to use JSString instead where possible.

3

I don't think I can do something like this with JSString.

let shaderString: String = "code string"

let source = UnsafeMutablePointer<Int8>.allocate(capacity: shaderString.count)
let size = shaderString.count
var idx = 0
for u in shaderString.utf8 {
    if idx == size - 1 { break }
    source[idx] = Int8(u)
    idx += 1
}
source[idx] = 0 // NUL-terminate the C string in the array.
4

I got away with StaticString this time! Thanks for response, now I know about limitations.

let vertexShaderSource:StaticString = "shader code"
let source = UnsafeMutablePointer<Int8>.allocate(capacity: vertexShaderSource.utf8CodeUnitCount)
let size = vertexShaderSource.utf8CodeUnitCount

for idx in 0..<size {
    let u = vertexShaderSource.utf8Start[idx]
    source[idx] = Int8(u)
}