https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87034
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> --- The warning in GCC 8 isn't bogus, it just reports the wrong number of bytes (it counts characters, not bytes). That the warning is no longer issued is a regression caused by c_strlen() giving up when the size of the constant array element doesn't match the expected size (in this case, sizeof(wchat_t) vs sizeof(char)). That change was made out of an abundance of caution in an effort to avoid folding suspect expressions that were felt didn't need to be folded (e.g., strlen((char*)L"\x41424344\x45464748")). There's nothing inherently wrong with folding those expressions, but they don't need to be folded for GCC to understand their length and make use of it to issue warnings.
