[Bug libc/23960] [2.28 Regression]: New getdents{64} implementation breaks qemu-user

["jrtc27 at jrtc27 dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23960

--- Comment #41 from James Clarke <jrtc27 at jrtc27 dot com> ---
(In reply to John Paul Adrian Glaubitz from comment #40)
> (In reply to Florian Weimer from comment #38)
> > So I think without new kernel/userspace APIs, the only way to fix this is to
> > change the binaries running under qemu-user (and not qemu-user itself) to
> > LFS interfaces, and stop using telldir/seekdir, in favor of d_off from
> > readdir64/LFS-readdir with lseek64/LFS-lseek.
> 
> How do I achieve this? Does this mean I have to patch 12.000 Debian source
> packages to switch the binaries to LFS mode? If this really involves
> patching all of these packages, then I don't think we will ever
> realistically achieve this.

Easiest thing would be to patch gcc/config/whatever.h to include:

    builtin_define ("_LARGEFILE_SOURCE=1");         \
    builtin_define ("_LARGEFILE64_SOURCE=1");       \
    builtin_define ("_FILE_OFFSET_BITS=64");        \

though I don't know if that causes problems for compiling glibc itself. Note
that this does count as an ABI break for things using off_t in structs exposed
in their API.

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