On Tue, Feb 9, 2021 at 6:19 AM Richard Biener <richard.guent...@gmail.com> wrote: > > On Tue, Feb 9, 2021 at 2:11 PM H.J. Lu <hjl.to...@gmail.com> wrote: > > > > 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. > > So object files compiled with GCC 10 still inter-operate with object
My patch does nothing for GCC 10. > files from GCC 11 > and -fcf-protection=none (aka the long-year default)? > Yes, if __builtin_setjmp and __builtin_longjmp aren't used. No, if they are. -- H.J.
