Support for musl libc under Linux#528
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Notably, this allows loading shared libraries on Linux systems using musl libc, which uses displacements for DT_STRTAB. The old logic based on negative displacements was nonsense because the dynamic string table can't possibly come before the base address, so effectively, we always assumed an absolute address under non-Android Linux. The new logic should be mostly free of false positives, but since it's still guesswork, we only use it when absolutely necessary. Technically, the code for FreeBSD/Solaris/Android also changes here because the displacement is no longer signed, but as explained above, displacements should never be negative.
- Don't use the glibc-specific struct _libc_xmmreg - Dummy out gnu_get_libc_version() if unavailable - Remove unused fpu_control.h include - Correct a typo in _LARGEFILE64_SOURCE (did nothing ever rely on lseek64?) - Guard the glibc-specific mcheck.h behind __GLIBC__
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Thank you for your patch. I am not worried about the mcheck stuff; as you note, it's for unusual debugging situations only anyway. |
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I hope the commit messages explain the exact changes well enough.
I'm not super happy with the solution for
mcheck.h, but as I understand it,start-mtraceandstop-mtraceare intended to be called manually for debugging purposes anyway, so it's not a big deal if the functions exist but fail.