wasm-ld reports error with LLVM web assembly backend

[Chuck H]

Hi, 

I manage to use LLVM web assembly backend in the emscripten with LLVM 9.0.0. And it gets the following error for the third party bc files:

wasm-ld: error: lib.bc: machine type must be wasm32

So what is the possible issue? any solution to it?  Thanks!

[Alon Zakai]

Bitcode files generated with an earlire version of emscripten need to be rebuilt. They will be rebuilt into wasm object files.

(Or, you can try to build everything with -s WASM_OBJECT_FILES=0 which uses LLVM IR as object files, but that is not guaranteed to be compatible between versions of LLVM, so it's best to rebuild anyhow.)

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