On Tue, Feb 9, 2021 at 12:59 AM Richard Biener <richard.guent...@gmail.com> wrote: > > On Mon, Feb 8, 2021 at 3:07 PM H.J. Lu via Gcc-patches > <gcc-patches@gcc.gnu.org> wrote: > > > > When the SHSTK feature is not available or not enabled, RDSSP is a NOP, > > always save and restore shadow stack pointer to support compiling source > > codes, containing __builtin_setjmp and __builtin_longjmp, with different > > -fcf-protection options. > > Is that an ABI change for -fno-cf-protection? >
Currently you can't mix object files with __builtin_setjmp and __builtin_longjmp compiled with -fcf-protection and -fcf-protection=none. This patch fixes it for GCC 11 and newer. It does nothing for object files compiled by older versions of GCC. -- H.J.
