False positive when calling a macro from within another macro

[jufajardini]

If I have a file with MACRO_B calling MACRO_A - which is defined in header-a.h, cppclean will complain that header-a.h doesn't need to be included:

Three files to reproduce:

• main.c

#include "macro-a.h"
#include <stdio.h>

int main( )
{
    int result = MY_RESULT(3);
    printf("result is %d\n", result);
    
    return 0;
}

• macro-b.h

#include "macro-a.h"

#define MY_RESULT(c) {          \
    ( MY_REPLACE_MACRO - (c))   \
}

• macro-a.h

#define MY_REPLACE_MACRO 345

Program compiles as runs as expected, but running cppclean gives a false positive:

cppclean macro-b.h 
macro-b.h:1: 'macro-a.h' does not need to be #included

Removing the macro-a.h include leads to a compilation error:

main.c:6:18: error: use of undeclared identifier 'MY_REPLACE_MACRO'
    int result = MY_RESULT(3);
                 ^
./macro-b.h:4:7: note: expanded from macro 'MY_RESULT'
    ( MY_REPLACE_MACRO - (c))   \