Re: Should Emacs 26 be portable to Glibc 2.28?

[Paul Eggert]

On 03/08/2018 05:39 AM, Eli Zaretskii wrote:
> -#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, 
> Linux libc5 */
> +#if defined _IO_ftrylockfile || defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 
> /* GNU libc, BeOS, Haiku, Linux libc5 */

Thanks, good suggestion, I installed that into Gnulib[1] and copied it 
into Emacs master[2].

However, after looking into this some more it turns out that we need not 
backport it to emacs-26. For Emacs built with Glibc, fpending.c is 
compiled only for glibc 2.1.92 and older, which means that the 
portability bug with glibc 2.28 cannot be triggered for Emacs. Sorry 
about the false alarm.

[1] 
https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=74d9d6a293d7462dea8f83e7fc5ac792e956a0ad

[2] 
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=f0c590b857415e94a8ed9ded0e9ba2f91ea2a3c7