https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108499
Bug ID: 108499
Summary: False positive -Warray-bounds
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: steveire at gmail dot com
Target Milestone: ---
```
#include <vector>
class MyStruct
{
public:
std::vector<double> const& refAccessor();
std::size_t getSize();
};
void emitsWarning()
{
MyStruct params;
auto unusedThing = params.refAccessor();
(void)unusedThing;
auto const theSize = params.getSize();
std::vector<double> initialVelocities(theSize, 0.0);
initialVelocities.back() = 6;
std::vector<double> initialJoints(theSize, 0.0);
initialJoints.back() = 5;
}
```
-Werror=array-bounds -O2
```
<source>: In function 'void emitsWarning()':
<source>:20:27: error: array subscript -1 is outside array bounds of 'double
[1152921504606846975]' [-Werror=array-bounds]
20 | initialVelocities.back() = 6;
| ~~~~~~~~~~~~~~~~~~~~~~^~
cc1plus: some warnings being treated as errors
Compiler returned: 1
```
https://gcc.godbolt.org/z/sYrK6o54a
