pitrou commented on PR #41128:
URL: https://github.com/apache/arrow/pull/41128#issuecomment-4603681917
Ate selectively added the `-fsemantic-interposition` file for the MemoryPool
implementation code and it seems it made the mimalloc symbols in the PyArrow
wheels interposable again.
This can be seen for example by the `arrow_mi_free` call going through the
PLT (whatever that means exactly :-)):
```
0000000000b89fc0
<_ZN5arrow18BaseMemoryPoolImplINS_12_GLOBAL__N_117MimallocAllocatorEE4FreeEPhll.lto_priv.0>:
b89fc0: 55 push %rbp
b89fc1: 48 89 d5 mov %rdx,%rbp
b89fc4: 53 push %rbx
b89fc5: 48 89 fb mov %rdi,%rbx
b89fc8: 48 83 ec 08 sub $0x8,%rsp
b89fcc: 48 3b 35 9d 78 de 01 cmp 0x1de789d(%rip),%rsi #
2971870 <_ZN5arrow11memory_pool8internal14zero_size_areaE@@Base-0x38d0>
b89fd3: 74 08 je b89fdd
<_ZN5arrow18BaseMemoryPoolImplINS_12_GLOBAL__N_117MimallocAllocatorEE4FreeEPhll.lto_priv.0+0x1d>
b89fd5: 48 89 f7 mov %rsi,%rdi
b89fd8: e8 23 a7 7b ff call 344700 <arrow_mi_free@plt>
b89fdd: f0 48 29 6b 48 lock sub %rbp,0x48(%rbx)
b89fe2: 48 83 c4 08 add $0x8,%rsp
b89fe6: 5b pop %rbx
b89fe7: 5d pop %rbp
b89fe8: c3 ret
```
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