Can I update the emscripten-llvm-backend by myself?

[Wanghb Wang]

As you can  see in the https://github.com/emscripten-core/emscripten/issues/9023. 

sbc100 fix the bug “getting an Optional.h hasValue assert”.

but the latest upstream-llvm version(1.38.42-upstream ) don't contain the code (cf2b8722d4e3bc4f0c106a5724778d56074e1ec7 -> 369423).

my question is: Can I update the emscripten-llvm-backend version?How to do it ?

[Thomas Lively]

Sure, you can build tip of tree llvm and clang from source and update your .emscripten file to point to your local build. Random checkouts of LLVM are not guaranteed to work because they have not necessarily been tested alongside your particular version of Emscripten on our CI, but in practice they usually work fine. Instructions to build LLVM are here: https://llvm.org/docs/CMake.html. 

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[Mehdi Sabwat]

If you're using emsdk, you can update tags then :

emsdk install tot-upstream

then activate the sdk to change emscripten configuration