28b48696d1
Define errno in .tbss. * sysdeps/unix/x86_64/sysdep.S [USE_TLS && HAVE___THREAD]: Use TLS access for setting errno. * sysdeps/unix/x86_64/sysdep.S: Store 32 bits at errno, not 64 bits. AFAICT, it was just blind luck that the word following errno in .bss was just alignment padding and not some other variable to be clobbered.