[debbugs-tracker] bug#24720: closed (Performance impact of -no-pie)

[GNU bug Tracking System]

Your message dated Tue, 18 Oct 2016 09:21:27 -0700
with message-id <address@hidden>
and subject line Re: bug#24720: Performance impact of -no-pie
has caused the debbugs.gnu.org bug report #24720,
regarding Performance impact of -no-pie
to be marked as done.

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24720: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24720
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> --- Begin Message ---
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> Subject: 
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> Performance impact of -no-pie
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> Date: 
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> Mon, 17 Oct 2016 13:18:51 -0700
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> Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0
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> (The rest of this message is copied from Alex's email archived at 
> <http://lists.gnu.org/archive/html/emacs-devel/2016-10/msg00451.html>.)
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> After being forced to add -no-pie to my CFLAGS in order to build Emacs with a 
> recent GCC, my startup time for my whole config (with -nw) has increased from 
> ~1 second to ~2 seconds.
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> The startup time for `emacs -Q -nw` went up from about 0.07s to 0.14s; again 
> it's about twice as slow.
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> The -Q time doesn't worry me, but the extra second for my main configuration 
> isn't pleasant.
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> Is such a performance impact expected? If so, is there a plan to regain the old 
> speed?
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> --- End Message ---
> --- Begin Message ---
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> Subject: 
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> Re: bug#24720: Performance impact of -no-pie
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> Date: 
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> Tue, 18 Oct 2016 09:21:27 -0700
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> User-agent: 
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> Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0
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> On 10/18/2016 08:59 AM, Glenn Morris wrote:
> > I'm going to guess that when you set it via CFLAGS, you lost the -O2
> > that is otherwise part of the default CFLAGS.
>
> Yes, that sounds quite plausible. Thanks for the diagnosis. Closing the bug.
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