Compiler warning for statement on same line as #endif-CodePudding

Consider code:

#include <stdio.h>

int main() {
    int a = 4;
#if 1
    printf("Hello world\n");
#endif a  ;
    printf("a is %d\n", a);
}

Inadvertently, statement a ; is on the same line as a #endif and is not evaluated. As a result, the final output is:

Hello world
a is 4

On x86-64 clang 12, this is captured as a warning with using option -Wextra-tokens. See

CodePudding user response：

There's compiler warning C4067. It looks like you need to set the flag /Za for it to apply to #endif directives.