test compiling c to wasm without c-lib or emscripten using clang-7 and ./0m shell script
lenstr.wasm print length of string in the textarea on console log after pressing button
because lenstr.wasm uses wasm memory add linker flag -Wl,--import-memory to clang
It needs lld package installed and python webserver but not thttpd
python -m SimpleHTTPDServer
Then browse to localhost:8000
Using firefox developers console to see output from console.log()
end.