void sbs(){
exit(0);
}
warning:
function might be possible candidate for attribute ‘noreturn’
Getting a warning as no return.. But here the return is not called, instead exit(0) is called.
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Natan Streppel
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Angus
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3What's your question? – Kerrek SB Sep 08 '14 at 18:58
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2You're explicitly calling the `exit()` system call which abnormally terminates the function call. That means control will never return to the above stack frame. – Jason Sep 08 '14 at 19:06
2 Answers
4
The warning is completely legit.
Attribute noreturn means you should write your prototype like this:
C11:
_Noreturn void neverreturn()
_Noreturn is the attribute.
or the GCC variant:
__attribute__((__noreturn__)) void neverreturn()
Here its obviously __noreturn__.
With this the compiler can make optimizations because it knows the function never will return.
Marco
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As mentioned by others ,your function should give the indication to compiler that it will not return to the caller.
Please check the bellow links.
