c++ - control may reach end of non-void function xcode -

i have third party library code segment has following structure:

class a;  func() {    if(...)    {        return a(...);    }    else if(...)    {        return a(...);    }    else    {        log(...);    }  } 

and gives error "control may reach end of non-void function" in xcode.

the same segment compile in vs2012 without problem. xcode c++ compiler dialect , standard library set c++89 , libstdc++. know expected behaviour doesn't vs2012 compiler behave in accordance standards?

when writing like

type func() {      ... } 

the compiler expect return object of type type in every paths of function, not here.

or log function return a object, doubt, , should write return log(), or log logging , should return a, null, throw exception or whatever need, don't reach end of function without returning anything.

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i don't know why vs2012 compile whereas, imho, shouldn't if does, don't write code that, you'll surprises later on project.