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PERL built with GCC 15 and -march=x86-64-v3 fails several op/pack.t cases due to aggressive lowering of __builtin_memcpy and inlined/fortified string ops. In pp_pack, some in-place copies can overlap, treating memcpy as non-overlapping yields corrupted bytes (zeros or wrong prefixes). The issue does not reproduce with -march=core2. When using x86-64-v3 memcpy gets emitted very aggressively (vectorized / reordered) and assumes no overlap. The flags force calls through libc (overlap-safe behavior), restoring deterministic pack/unpack and fixing the test failures. Inline functions could be faster in execution but correctness is more important Fixes [YOCTO #15950] (From OE-Core rev: 6d557b16f1e45e616c6eb208e4d7a2f2839a2e4f) Signed-off-by: Khem Raj <raj.khem@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>