How to use LLVM/Clang version 7 to build WASM binaries

[Osman Zakir]

I want to know how I can use LLVM/Clang version 7 with Emscripten.  Is it possible?  

Along with that I'd like help on the other questions I've asked (sorry for opening more than one thread).  

My code is here: https://github.com/DragonOsman/currency_converter .  The code I want to compile to WebAssembly is of course currency_converter.cpp (it's using Boost.ASIO's asynchronous networking functions).  I used the official port of ASIO that's been added to the Emscripten Ports GitHub page.  I think someone should verify the version used somehow, but for now it's probably okay.

[Sam Clegg]

On Tue, Nov 20, 2018 at 2:23 PM Osman Zakir <osman...@gmail.com> wrote:
>
> I want to know how I can use LLVM/Clang version 7 with Emscripten. Is it possible?

If you want to use upstream llvm/clang with emscripten you probably
want to be using llvm HEAD which is currently on 8.0.0. This is
because there are still changes being made to the ABI and
emscripten/binaryen expects the latest version.

If you don't want to build from source you can grab a version of the
emsdk that contains the upstream backend.
e.g emsdk install sdk-upstream-1892-64bit.

>
> Along with that I'd like help on the other questions I've asked (sorry for opening more than one thread).
>
> My code is here: https://github.com/DragonOsman/currency_converter . The code I want to compile to WebAssembly is of course currency_converter.cpp (it's using Boost.ASIO's asynchronous networking functions). I used the official port of ASIO that's been added to the Emscripten Ports GitHub page. I think someone should verify the version used somehow, but for now it's probably okay.
>

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[Osman Zakir]

Thanks for the reply. I'll try the upstream emsdk.  

[Osman Zakir]

The command for installing the upstream emsdk version gave me this error:

Error: No tool or SDK found by name 'sdk-upstream-1892-64bit'.

 

[Osman Zakir]

What I want is the latest stable release.  I don't want the release candidates.  But yeah, please also help with the error I got when trying to install the upstream version.  

[Osman Zakir]

Oh and, also, I installed LLVM version 7.0.0 which is why I wanted to know how to use it with Emscripten.  I read that it's possible to use the LLVM that doesn't have any of Emscripten-specific modifications, and that WebAssembly is intended to be a first-class target for LLVM.  That's why I asked.  

[Sam Clegg]

On Wed, Nov 21, 2018 at 3:16 AM Osman Zakir <osman...@gmail.com> wrote:
>
> Oh and, also, I installed LLVM version 7.0.0 which is why I wanted to know how to use it with Emscripten. I read that it's possible to use the LLVM that doesn't have any of Emscripten-specific modifications, and that WebAssembly is intended to be a first-class target for LLVM. That's why I asked.
>

There is indeed upstream support in LLVM for WebAssembly today. With
version 7.0.0 however it is not included by default (you need to
compile with `LLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly`).

Once version llvm version 8.0.0 is released it will have WebAssembly
as one of the default targets (see
https://reviews.llvm.org/D52850).

If you have such as version of LLVM on your system then emscripten
will use this LLVM_ROOT in your config file to point to this version.