Found in the code:
const int S=sizeof(char*); // 4 = x86, 8 = x86-64
if (*(char*)&t!=0x78 || (S!=4 && S!=8))
error("JIT supported only for x86-32 and x86-64");
Yet the arch check code is not strong, it lets ppc through and then fails.
It also seems to have "invalid instruction" code detection but that only works
on x86 as well.
TL;DR Jit in zpac isn't good for non x86.
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https://bugs.launchpad.net/bugs/1669069
Title:
lrzip dies on ppc64el when using zpaq
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