| Issue |
83838
|
| Summary |
Clang initializer_list inside a global struct variable generates undef elements
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Qwinci
|
Clang generates an undef in place of the `"arm,gic-v3"` string_view in this case
```cpp
#include <cstddef>
#include <initializer_list>
class string_view {
public:
constexpr string_view(const char* s) :_size {} {
while (*s++) ++_size;
}
private:
size_t _size;
};
struct MyStruct {
std::initializer_list<const string_view> list {};
};
static MyStruct FOO {
.list {"arm,gic-v3"}
};
```
I am not sure if having an initializer_list inside a global struct variable like this is allowed by the standard as a global initializer_list variable certainly is allowed. At least gcc works fine with this case and clang works too if you either make the global variable constexpr, string_view constructor consteval or modify it like this
```cpp
class string_view {
public:
constexpr basic_string_view(const T* s) : _ptr {s}, _size {const_strlen(s)} {}
private:
static constexpr size_t const_strlen(const char* s) {
size_t len = 0;
while (*s++) ++len;
return len;
}
size_t _size;
};
```
Here is a godbolt link https://godbolt.org/z/dvo74zPab
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