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[GunChleoc <fios@xxxxxxxxxxxxxxxxxxx>]

Here's the answer:

http://stackoverflow.com/questions/1610030/why-can-you-return-from-a-non-void-function-without-returning-a-value-without-pr

-Werror=return-type will treat just that warning as an error.

Full manual:

https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
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