https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116619
Bug ID: 116619
Summary: Invalid null pointer constant accepted in the
initializer of a pointer
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: luigighiron at gmail dot com
Target Milestone: ---
The following code is incorrectly accepted by GCC:
int main(){
void*p=int(0);
}
This code is invalid because int(0) is not a null pointer constant. Clang and
MSVC (with /permissive-) reject this program for this reason. Also, GCC rejects
this as a null pointer constant in some other contexts, for example:
#include<iostream>
void foo(void*){
std::cout<<"1\n";
}
void foo(...){
std::cout<<"2\n";
}
int main(){
foo(0);
foo(int(0));
}
GCC prints "1 2" here (correctly) since int(0) isn't treated as a null pointer
constant. Though not all other contexts handle this correctly, for example
static_cast<void*>(int(0)) is also incorrect accepted.
