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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: GNAT 5.1.0 for Mac illegal instructions
Date: Thu, 19 Nov 2015 10:10:53 +0000
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Date: 2015-11-19T10:10:53+00:00
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David Botton <david@botton.com> writes:

> I tried today to install gnat 5.1.0 on a fresh El Capitan install and
> doing a make on a fresh git clone of Gnoga I received the following
> errors. Any ideas?
>
> /var/folders/42/lql9f6rs1n599ymxts7qzv_c0000gn/T//cc3KBvnz.s:64136:2:
> error: ambiguous instructions require an explicit suffix (could be
> 'filds', or 'fildl')
>         fild    -464(%rbp)
>         ^

I got this while rebuilding GNAT GPL 2015; I think it's a change to the
behaviour of Apple's assembler in the latest command line tools.

The file I got the problem with was g-alleve.adb, part of the Altivec
extensions.

AdaCore are aware of the problem, and have a fix, but I don't know when
we will see it.

The Altivec extensions are probably of little interest unless you want
to be portable to Power computers (unlikely); so I disabled the
GNAT.Altivec tree by nulling out GNATRTL_ALTIVEC_OBJS in
gcc/ada/Makefile.rtl.