We should add a toolchain named (emcc). like this

and add a new platform and arch, wasm and wasm32

then run

./configure --plat=wasm --arch=wasm32
make

and we can improve to detect platform/arch in emcc envs.

so we just need

./configure
make

Added a new toolchain called wasm32_unknown_wasm, I'm not sure if this is the correct triplet name so please let me know if I should change it.

and you can check envs to detect wasm platform and arch automatically.

and you can check envs to detect wasm platform and arch automatically.

Do you have a suggestion for which environment variable to check? It looks like EMMAKEN_JUST_CONFIGURE=1 is set when emconfigure is run, that one might be useful. I suppose we could also just check for EMSCRIPTEN too. Which do you prefer?

Looks like EMSDK is the only reliable variable present when the Emscripten SDK shell has been loaded up, so I'm checking for that. Seems to work as expected when I run this:

docker run -v `pwd`:`pwd` -w `pwd` -u $(id -u):$(id -g) emscripten/emsdk /bin/sh -c "./configure"

Output:

checking for platform ... wasm
checking for architecture ... x86_64
checking for make ... ok
checking for the c (cc) ... emcc
checking for the c++ (cxx) ... emcc
checking for the assembler (as) ... emcc
checking for the objc (mm) ... emcc
checking for the objc++ (mxx) ... emcc
checking for the linker (ld) ... em++
checking for the static (ar) ... emar
checking for the shared (sh) ... em++
checking for toolchain ... emcc
...

ok, thanks!

Thank you, too!