glibc/sysdeps/mach/hurd/Versions

libc {
  GLIBC_2.0 {
    # functions with a weak definition in the dynamic linker
    __mmap;
  }
  GLIBC_2.2.6 {
    # functions with a weak definition in the dynamic linker
    __writev;
  }
  GLIBC_2.32 {
    mremap;
  }
  GLIBC_PRIVATE {
    # Functions shared with the dynamic linker
    __access; __access_noerrno; __libc_read; __libc_write; __libc_lseek64;
    __close_nocancel;
    __open_nocancel;
    __read_nocancel; __pread64_nocancel;
    __write_nocancel;
    __libc_lock_self0; __getcwd;

    _dl_init_first;
    __close_nocancel_nostatus;

    # functions used in other libraries
    __sigprocmask;
  }
}

ld {
  GLIBC_2.0 {
    # variables that must be shared with libc
    __hurd_threadvar_stack_mask;  __hurd_threadvar_stack_offset;

    # functions that must be shared with libc
    __close; __getpid;
    __mmap; __open; __read; __sbrk; __strtoul_internal;
    __write; __writev; __xstat64; __fxstat64;
    _exit; _hurd_intr_rpc_mach_msg;
    abort;
  }
  GLIBC_2.1 {
    # functions that must be shared with libc
    __pread64;
  }
  GLIBC_2.2 {
    # functions that must be shared with libc
    __open64;
  }
  GLIBC_2.2.6 {
    # this also must be shared with libc.
    __errno_location;
  }
  GLIBC_PRIVATE {
    _dl_init_first;

    # functions that must be shared with libc
    __access; __access_noerrno; __libc_read; __libc_write; __libc_lseek64;
    __close_nocancel;
    __open_nocancel;
    __read_nocancel; __pread64_nocancel;
    __write_nocancel;
    __libc_lock_self0; __getcwd;
  }
}