https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117465
Bug ID: 117465
Summary: Disable -Wnonnull-compare in macros
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: david.bolvansky at gmail dot com
Target Milestone: ---
#include <cstdio>
#define DEBUG(ptr) if (ptr) printf("%p", (void *)ptr);
class Clz {
int data;
public:
Clz(void) {
DEBUG(this);
}
};
int main(void) {
int i;
DEBUG(&i);
Clz a;
return 0;
}
g++ -Wall -Wextra code.cpp
warning: 'nonnull' argument 'this' compared to NULL [-Wnonnull-compare]
3 | #define DEBUG(ptr) if (ptr) printf("%p", (void *)ptr);
This is quite annoying in macros. Derived from real code, where null check is
needed, as macro is universal.
