bug#25141: Compilation issue on AIX 7.1 and 64 bits

[Eli Zaretskii <eliz@gnu.org>]

unblock 24655 by 25141
thanks

> From: Eric LeBlanc <cognefou@hotmail.com>
> Date: Sun, 25 Dec 2016 14:42:41 +0000
> Cc: "25141@debbugs.gnu.org" <25141@debbugs.gnu.org>
> 
> Probably, but I won't count too much on 32 bits binary because we tried two RPM emacs packages, one from
> IBM website and the other from BULLFREEWARE website and they both ended with a "Segmentation Fault"
> with a core dump when we execute "emacs".
> 
> I also played with LDR_CNTRL variable without any success.
> 
> It seems that AIX 7.1 is very memory strict with 32 bits binaries and I'm sure that "unexec" is doing some
> memory dump to the final emacs binary that AIX 7.1 doesn't like.
> 
> That's why I'm tyring to compile in 64 bits.
> 
> For the moment, "temacs" in 64 bits works well but slow to start. I'm stuck at 'unexaix' operation and I'm not
> an expert in XCOFF binary file. I know that 'unexaix.c' isn't adapted for 64 bits binaries and I tried to make
> some modifications as I wrote earlier by enabling __XCOFF64__ in "unexaix.c" source code, without success
> since it generates a huge 4GB emacs binary, but I know I'm not so far to fix it.

Without any additional comments during the last 8 months, and AIX
being a platform of secondary importance, I don't see why this bug
should block the release of Emacs 26.1.

If you have any news on these issues, please tell.

Thanks.