How to do an explicit fall-through in C

Question

The newer versions of gcc offer the Wimplicit-fallthrough, which is great to have for most switch statements. However, I have one switch statement where I want

Answer 1

GCC fallghrough magic comments

You should not use this if you can help it, it is insane, but good to know about:

int main(int argc, char **argv) {
    (void)argv;
    switch (argc) {
        case 0:
            argc = 1;
            // fall through
        case 1:
            argc = 2;
    };
}

prevents the warning on GCC 7.4.0 with:

gcc -Wall -Wextra main.c

man gcc describes how different comments may or not be recognized depending on the value of:

-Wimplicit-fallthrough=n

C++17 [[fallthrough]] attribute

C++17 got a standardized syntax for this: GCC 7, -Wimplicit-fallthrough warnings, and portable way to clear them?