[Bug 273712] off64_t namespace pollution in <sys/types.h> or incomplete LFS64 API support

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 10 Sep 2023 20:53:00 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273712

            Bug ID: 273712
           Summary: off64_t namespace pollution in <sys/types.h> or
                    incomplete LFS64 API support
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: standards@FreeBSD.org
          Reporter: jbeich@FreeBSD.org
                CC: cem@freebsd.org

off64_t is part of Large File Support API that FreeBSD never supported as off_t
is always 64-bit. base 6710d21d9f7fc added off64_t for glibc compatibility but
not the rest of LFS like stat64, fseek64, etc. Unfortunately, this namespace
pollution is incompatible with glibc and musl where off64_t is limited to
_LARGEFILE64_SOURCE.

See also
https://sourceware.org/git/?p=glibc.git;a=blob;f=posix/sys/types.h;hb=refs/tags/glibc-2.38#l87
https://git.musl-libc.org/cgit/musl/commit/?id=2dd8d5e1b8ba

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