> For non-threaded libc needs to be exported. The use of __errno_location is in only in sysdeps/.../bits/errno.h files (and not the generic ones). So as things stand, it belongs in a corresponding sysdeps/.../Versions file, not the generic one. That's why it is in sysdeps/unix/sysv/linux/Versions and sysdeps/mach/hurd/Versions.