https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91007
Bug ID: 91007
Summary: stable_sort segfaults on -O3
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: barry.revzin at gmail dot com
Target Milestone: ---
Reduced from StackOverflow (https://stackoverflow.com/q/56779605/2069064):
#include <vector>
#include <algorithm>
int main() {
using V = std::vector<int>;
std::vector<V> conns{
V{0,2},
V{0,2},
V{0,2},
};
std::stable_sort(conns.begin(), conns.end(),
[](const V& a, const V& b){
return a[0] < b[0];
}
);
}
On gcc 9.1, compiled with -O3, this segfaults. With -O2 and under, it's fine.
On gcc 8.3, it's fine.
