Potential issue regarding ABI identification for PyPI manylinux purposes

[xen0n]

Link: pypa/manylinux#1587

If we were to support LoongArch manylinux wheels on PyPI, we must be able to prevent installation of wheels built on a different world than that of the running system.

Right now, due to:

• Adjust the Multiarch Specifier loongson/LoongArch-Documentation#80
• gh-90656: Add platform triplets for 64-bit LoongArch (LA64) python/cpython#30939

the multiarch specifiers for both worlds are the same, so we must be able to distinguish by other means. This is likely glibc symbol versions for glibc-based systems, but I think musl-based systems will need something else.

[xen0n]

cc @yzewei @loongson-zn (seems both are from Loongson)

[xry111]

Maybe just check EF_LOONGARCH_OBJABI_V1 for every EM_LOONGARCH ELF files containing a SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS section in the wheel.

[xry111]

Or, we can add this check into libc loader (gated with something like a Glibc tunable) and the packages requiring such a check will be able to simply enable it.