On Tue, Feb 09, 2021 at 06:25:10AM -0800, H.J. Lu via Gcc-patches wrote: > 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.
Therefore ABI change.
Also, is RDSPP really a nop even on say -march=i386/-march=i486?
Or was it only ENDBR32 that is problematic for the very old CPUs?
Jakub
