https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102045
Bug ID: 102045
Summary: constructor is not being instantiated
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hanicka at hanicka dot net
Target Milestone: ---
this error is in 11.0+ (including current trunk) and wasn't in gcc-10, the
compiler won't emit std::span<char>::span<char&[N1]> symbol as it should
```
#include <span>
struct byte_writer: std::span<char> {
using std::span<char>::span;
//byte_writer(auto && arg): std::span<char>{arg} { }
constexpr void do_something() noexcept {
(void)this->empty();
}
};
int main() {
char array[1];
auto writer = byte_writer{array};
writer.do_something();
}
```
if you explicitly use the constructor (commented out) it will emit the symbol,
also the symbol is emitted if `using std::span<char>::span;` is added to the
type.
https://compiler-explorer.com/z/q8z833eqd
