Explicitely disable WASM code generation for Emscripten #51875
Merged
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Emscripten changed the default behavior recently:
https://github.com/kripken/emscripten/blob/bd050e64bb0d9952df1344b8ea9356252328ad83/ChangeLog.markdown#v1381-05172018
It now defaults to WebAssembly and requires an explicit flag to generate asm.js.
WASM=0 is also valid for older emcc and thus doesn't break it.