I declare an external function in C source file, but never used by the
code, then compile it to wasm by EMCC.   there is no doubt the external
function will be eliminated by the compiler.

Is there any approach to keep this external function and then be compiled
to an import function in wasm?

The motivation to remain the external function is that I want to insert
some wasm code in the wasm file after it's generated.

Thanks all!

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