https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121971
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|c |target Status|UNCONFIRMED |RESOLVED Resolution|--- |WONTFIX --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Musttail does work on those targets for many functions. It just does not work for the functions that protobuf uses. That is on protobuf and the other libraries that use musttail to test. Also "exotic" is wrong because even riscv and s390 sometimes will error out on the musttail on functions in somecases which other targets dont and riscv is mainstream. Even aarch64 will error out sometimes that X86_64 wont too. So there is no single rule here.