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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: This statement may fall through - how?
Date: Wed, 29 Apr 2020 17:58:30 -0700
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mathog <mathog@caltech.edu> writes:

> [..warning 'statement may fall through'..]
>
> [...] Is there really some way that usage() can
> avoid hitting exit() or is the compiler just emitting a general
> warning without actually looking at usage()?
>
> void usage()
> {
>     printf("%s",usage_string);
>     exit(0);
> }
>
> [call to 'usage()' just before a 'case' label]

    _Noreturn void usage(){ ... }

gcc-8 -std=c11 -pedantic-errors -Wall -Wextra ...