https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106926
--- Comment #2 from John Zwinck <jzwinck at gmail dot com> --- Jonathan, yes it was a real problem, I wrote such buggy code myself. I was more complacent with string_view than I might have been with std::string because everyone knows string_view doesn't have to be null terminated (bad excuse, but it's mine). I agree the same problem could happen with std::string. As for your idea to add an attribute, I assume you mean something like this: string_view(const char* s __attribute__((does_strlen))); I think this would work but it seems like the attribute would have to be added in many places. Instead, the compiler could statically determine that the length of the string is lost in code like this: string_view foo("bad\0string"); And maybe even here: const char* bar = "another\0one"; Though that may be a step too far because someone could hard-code the length 12 elsewhere, and there probably is code in the wild doing that. In general the diagnostic could apply wherever the compiler knows the contents will be copied. Since that's not always possible to know, maybe it could assume copying will happen when the literal is passed to an out-of-line function. I recognize this might be too harsh for -Wall; I'd still be quite happy to see the warning with -Wextra. The attribute idea is also fine, if you think it's feasible to apply it in enough places and not too ugly. Thank you.