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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: [SOLVED] (was: very different start up for emacs master compared
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Date: Wed, 14 Aug 2019 17:24:01 +0300
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> From: "otadmor ." <otadmor@gmail.com>
> Date: Wed, 14 Aug 2019 08:19:19 +0300
> Cc: oub@mat.ucm.es, emacs-devel@gnu.org
> 
> I meant issues of emacs with Ofast. If some things are known to be broken on emacs with this. I'm not sure
> gcc man will give notes on emacs.

That option's downsides are not related specifically to Emacs.  The
option causes GCC to use optimizations that can produce invalid
programs.  I don't think anyone has tried it with Emacs, and for a
very good reason: it is not intended for general purpose programs.  I
personally advise to stay away of it, except when building programs
where you understand very well the floating-point numerical aspects of
every single line of code.