Possible false positive on macro expansion

[Daniel R]

Hi,

With the following code:

#include <stdio.h>

#define bar(x) x % 2
#define foo(x) printf(#x "\n")

int main(void)
{
    foo(bar(3));
    return 0;
}

cppcheck returns the following error:

Checking test.c ...
test.c:8:5: error: printf format string requires 1 parameter but only 0 are given. [wrongPrintfScanfArgNum]
    foo(bar(3));
    ^

But upon execution I get the expected behaviour:

$ gcc test.c -o test && ./test
bar(3)

Can you please confirm it's a false positive?

Thanks!

[Daniel Marjamäki]

Thanks! It's a preprocessor bug. I have created this issue:
https://github.com/danmar/simplecpp/issues/296