Cosima Neidahl
f950919251
On 64-bit POWER, there are multiple versions of the ELF ABI in use.
- little-endian powerpc64 is ELFv2
- big-endian powerpc64 is
- ELFv2 when using musl
- either ELFv1 or ELFv2 when using glibc
Previously, the BPF build was hard-coding `-D_CALL_ELF=2`, which is
ELFv2. This makes the build fail on ELFv1, similarly to the original
issue that necessitated the addition of this flag on powerpc64le.
To fix this:
1. Use ELFv1 as the default (when `_CALL_ELF` is not defined, this is
the assumption that should be made about the ABI version).
2. Check if the C compiler has `_CALL_ELF` defined, and if it does,
override the default with that.
That's technically not the *correct* compiler in this situation, but I'm
unsure how to get a compiler object for the BPF one from Meson to do the
`*_define('_CALL_ELF')` checks with, and they *should* both be targeting
the same ABI version anyway.
3. Add the ABI version to the `_CALL_ELF` definition for the BPF
compiler flags.
This makes a BPF-enabled build succeed on powerpc64 w/ ELFv1 glibc.
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