From: Eli Zaretskii <eliz@gnu.org>
To: Andrea Corallo <akrl@sdf.org>
Cc: evan@eklitzke.org, emacs-devel@gnu.org
Subject: Re: [PATCH 1/1] Stop using legacy -ffat-lto-objects flag
Date: Mon, 09 Nov 2020 17:59:02 +0200 [thread overview]
Message-ID: <83v9ee4j3t.fsf@gnu.org> (raw)
In-Reply-To: <xjf4klygb5c.fsf@sdf.org> (message from Andrea Corallo on Mon, 09 Nov 2020 08:57:51 +0000)
> From: Andrea Corallo <akrl@sdf.org>
> Cc: Evan Klitzke <evan@eklitzke.org>, emacs-devel@gnu.org
> Date: Mon, 09 Nov 2020 08:57:51 +0000
>
> >> Currently when Emacs is configured using the
> >> --enable-link-time-optimization configure flag, the build will use the
> >> -ffat-lto-objects flag if the host compiler is GCC (but not Clang).
> >> According to the comments in configure.ac this is to work around an
> >> issue with LTO builds in GCC 4.9.0. This flag makes builds take much
> >> longer (and produces much larger object files), so I suggest removing it
> >> as GCC 4.x is quite old at this point and doesn't have great LTO support
> >> anyway.
> >
> > I think this is too soon: fencepost.gnu.org, which runs Trisquel LTS,
> > still has GCC 4.8.4.
> >
> > Thanks.
>
> Couldn't we check and decide based on the GCC version? IIUC we already
> do something like this using gl_GCC_VERSION_IFELSE.
That'd be fine with me, thanks.
prev parent reply other threads:[~2020-11-09 15:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-08 20:05 [PATCH 1/1] Stop using legacy -ffat-lto-objects flag Evan Klitzke
2020-11-09 3:23 ` Eli Zaretskii
2020-11-09 8:57 ` Andrea Corallo via Emacs development discussions.
2020-11-09 15:59 ` Eli Zaretskii [this message]
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