https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67623
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- int main() { printf ("Hello\ /* ssss */\ world"); } works as expected though: > ./a.out Hello /* ssss */ world but then libcpp doesn't know about fortrans continuation character? And C does not accept a literal newline (we're escaping that).