https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109991
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Component|sanitizer |c++
Last reconfirmed| |2023-05-26
Ever confirmed|0 |1
Blocks| |55004
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
That is because with constexpr, the code should have been rejected ...
Take this C++20 GCC accepts it (incorrectly) but clang rejects it:
```
using T = int;
struct Wrap
{
T const& v;
constexpr Wrap(T const& in) : v{in} {}
};
struct BadWrapUse final
{
T i{};
consteval BadWrapUse()
{
Wrap w{T{}}; // temporary T's lifetime ends after this expression
i = w.v; // This should lead to stack-use-after-scope.
}
};
int main()
{
BadWrapUse c;
}
```
Note there might be a dup of it somewhere.
Basically in your original example, GCC is doing constexpr evulation but that
is not valid for constant expression evulation ...
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004
[Bug 55004] [meta-bug] constexpr issues
