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: 1: warning: "I: \ Qt \ emsdk - master \ upstream \ emscripten \ emcc bat" is 2 by qmake, but "I: \ Qt \ emsdk - master \ upstream \ bin \ clang exe" is configured in the kit.
Both Please update your kit (Qt 5.15.2 WebAssembly) or choose a mkspec for qmake that matches your target environment better.