Why can't I find compiler 'em++' when installing wasm directives?

[mirro]

Why is there a message indicating that you cannot link to the target when compiler 'em++' is already installed?

configure -xplatform wasm-emscripten -nomake examples -feature-thread -prefix C:/Qt/Qt5.15.2/5.15.2/wasm

[JonB]

@mirro
In the left hand pane you show running emsdk_env.bat to set up whatever environment necessary to run em++. How does that relate to the situation in the right-hand pane? You probably need to have run that .bat. Also, at left you are in the D:\emsdk directory, perhaps em++ is there? In the right-hand pane you are in a different directory. Perhaps you either need D:\emsdk on your PATH or you need the command from qmake to specify the full path as D:\emsdk\em++?

[mirro]

@JonB

Hi~,How does the qmake command set the path to D:\emsdk\em++?