Emscripten does not support WebAssembly

[Viktor Engelmann]

The emscripten package delivers emscripten version 1.22.1 from 2014, which did not have support for WebAssembly.

Compiling a newer version manually isn't that hard (see https://askubuntu.com/questions/891630/how-to-install-the-latest-emscripten-on-ubuntu-using-command-line ), but since WebAssembly has been agreed upon by all major browser manufacturers and seems to be the upcoming web-technology, ubuntu should definitely offer support for developers.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[C.W.Holeman II (cwhii)]

Why would emcc from the current version of emscripten, 1.22.1-1build1, installed from the ubuntu synaptic package manager expect LLVM to be at 3.4 when the LLVM versions listed in synaptic are 3.7, 3.8, 3.9 & 4.0? I would presume that emcc would not give an error if I did things correctly. What is not right?

$ emcc -v
emcc (Emscripten GCC-like replacement + linker emulating GNU ld ) 1.22.1
clang version 4.0.0-1ubuntu1 (tags/RELEASE_400/rc1)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/7.0.1
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.0.1
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/7.0.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.0.1
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.0.1
Candidate multilib: .;@m64
Selected multilib: .;@m64
WARNING root: LLVM version appears incorrect (seeing "(tags/RELEASE_400/rc1)", expected "3.4")
INFO root: (Emscripten: Running sanity checks)

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 17.04
Release: 17.04
Codename: zesty