test(ppc64): enable ppc64le in the test harness and CI#2003
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Add the Ppc64 architecture to the test harness: powerpc64le target triple, -m elf64lppc emulation, the ld64.so.2 dynamic linker, the cross-toolchain prefix and native-host detection. linker-diff support is still required before the tests can actually run.
Add ArchKind::Ppc64 and a linker-diff ppc64 module (objdump-based instruction decoding via -m powerpc:common64; no relaxations or PLT decoding yet), wired into the diff dispatch, objdump selection and EM_PPC64 detection, plus DynamicRelocationKind::from_ppc64_r_type. Also pass --endian=little to objdump unconditionally: every target we support is little-endian, but the generic powerpc:common64 machine defaults to big-endian and would otherwise disassemble garbage.
The perf module is only available on linux x86_64/aarch64; other linux targets alias perf_unsupported as perf. powerpc64 was missing from that list, so libwild failed to build natively on ppc64le.
The no-libc test runtime needs two per-arch bits on ppc64le: an exit_syscall stub, and a memcpy (ppc64le gcc lowers large aggregate initialisers to a memcpy call where the other targets inline it).
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davidlattimore
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May 31, 2026
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This PR wires ppc64le into the integration-test harness, linker-diff, and CI so the port is actually covered, and installs the cross toolchain so it runs in GitHub Actions under qemu.