On Sun, Apr 18, 2021 at 07:25:08PM +0200, Fawad Lateef wrote: > I tried booting the userspace compiled with gcc-9.1 and kernel > compiled with gcc-5.5. But seems like the kernel 3.4.111 is not > compatible with user-space compiled with gcc-9.1. > During boot getting error: "FATAL: kernel too old." (from init I > believe) and then kernel Panics. Log (part) below:
That's not a compiler issue, it's a libc issue. When you built your toolchain you have likely (or accidently) selected a minimum kernel version that is more recent than this one. The init code in the linker checks the kernel version and refuses to start in such a case. If your init depends on this libc, you simply cannot boot. I don't know how far recent libcs can go on kernel support, but you may possibly need to rebuild an older one, and sometimes older libc will not build with modern gcc. So you should use the most recent libc that still claims to support that kernel, and use the most recent compiler your libc can be built with (maybe yours is OK but I don't know). Hoping this helps, Willy
