>> You can use -r option (e.g. ./qemu-riscv64 -r 4.15) or set QEMU_UNAME
>> environment variable to change the uname for qemu.
> But be aware that the emulated environment still assumes that all system
> calls implemented by 4.15 are available, and qemu linux-user generally
> just passes them through to the host kernel.  If the host kernel is too
> old to provide a particular system call the emulation may malfunction.

Yeah, but it's enough for running gcc testsuite.

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