Will the c++ compiler optimize away unused return value?

Question

If I have a function that returns an object, but this return value is never used by the caller, will the compiler optimize away the copy? (Possibly an always/sometimes/never

Answer 1

just tried this example on compiler explorer, and at -O3 the mov is not generated when the return value is not used.

https://gcc.godbolt.org/z/v5WGPr