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According to MSDN Visual C++ can emit C4711 warning: function X selected for inline expansion if the compiler decides to inline a function that was not marked inline.
I don’t see how this warning can be useful. Suppose I compile my code and see this warning. Now what? Why would I care?
It isn’t on by default. You can turn it on if for some reason you’d like to know when functions are inlined. This can be relevant if, say, code size is at a severe premium, or you were expecting to jump into the function from outside the module, or you need the assembly to look a certain way. It can help track down code generation bugs as well.
It’s purely informational.