[Bug tree-optimization/90905] missing -Wreturn-local-addr returning a local std::string::c_str()

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90905

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2020-01-28 00:00:00         |2024-4-7

--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note changing:
```
const char *p = "def";
```
To:
```
static const char *p = "def";
```

we do warn though.

But increasing the size like:
```
static const char *p = "def123123123123123123123123123123";
```

We don't warn.

With the larger size we get:
```
  operator delete (_8, _12);

  <bb 4> [local count: 1073741824]:
  str ={v} {CLOBBER(eob)};
  str ={v} {CLOBBER(eos)};
  return _8;
```

Which is not exactly a `-Wreturn-local-addr` warning but rather a
`-Wuse-after-free` warning.