gccclangnoreturn

Is it a problem to have an incorrect "'noreturn' should not return" warning?

I'M USING NOSTDLIB! So I can't use C's abort. In fact I'm implementing a variant of it

I get the following warning in clang

a.c:12:1: warning: function declared 'noreturn' should not return [-Winvalid-noreturn]

in GCC it says

a.c:12:1: warning: ‘noreturn’ function does return

Is this a problem or fix-able? It seems like gettid is implicit even though the man pages says it is in unistd.h.

#include <signal.h>
#define _GNU_SOURCE
#include <unistd.h>

#ifndef __clang__
[[noreturn]]
#endif
__attribute__ ((__noreturn__))
void test()
{
        kill(gettid(), SIGABRT);
}

int main() {
        test();
        return 0;
}
Solution

  • You can do:

    __attribute__ ((__noreturn__))
void test(void)
{
        kill(gettid(), SIGABRT);
        __builtin_unreachable();
}