Support for legacy fastcomp versions

[atteneder]

Hi,

first of all thanks for this great action!

I need to maintain builds that run emscripten version 1.38.48-fastcomp.
This action seems to always install the latest (3.1.30 as of now) and runs it to install older versions. Unfortunately this won't install fastcomp versions any longer:

/home/runner/work/_temp/.../emsdk-main/emsdk install 1.38.48-fastcomp
error: the fastcomp backend is no longer supported.  Please use an older version of emsdk (for example 3.1.29) if you want to install the old fastcomp-based SDK

Is there a fix or way around it?

Thanks!

[atteneder]

I ended up using numworks/setup-emscripten.

It seems to smartly choose emscripten version 3.1.29 instead of the latest one in case the desired version contains fastcomp. Maybe that's something this action could adopt.

steps:
  - uses: numworks/setup-emscripten@v1
    with:
      sdk: latest-fastcomp
  - run: emcc --version

Thanks