https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99778
Bug ID: 99778
Summary: Spurious -Wzero-as-null-pointer-constant on three-way
comparisons
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: headch at gmail dot com
Target Milestone: ---
Consider the following code:
#include <compare>
#include <iostream>
int main() {
std::strong_ordering o = 1 <=> 2;
if(o == 0) {
std::cout << "equal\n";
} else {
std::cout << "unequal\n";
}
return 0;
}
When compiled with -Wzero-as-null-pointer-constant, this generates a warning on
the “if” line.
This sounds almost the same as bug #95242, except that bug is closed as fixed
for 10.2, and I am running 10.2.0 and still get this problem; also, the code
quoted in that bug does not generate a warning for me, while this code still
does.
