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Re: [PATCH] Remove .jcr registry from the crtfiles
- From: Jakub Jelinek <jakub at redhat dot com>
- To: Florian Weimer <fw at deneb dot enyo dot de>
- Cc: Richard Biener <rguenther at suse dot de>, Andrew Haley <aph at redhat dot com>, Ian Lance Taylor <ian at airs dot com>, gcc-patches at gcc dot gnu dot org
- Date: Sat, 1 Oct 2016 23:23:21 +0200
- Subject: Re: [PATCH] Remove .jcr registry from the crtfiles
- Authentication-results: sourceware.org; auth=none
- References: <20161001202925.GN7282@tucnak.redhat.com> <87bmz3ssoy.fsf@mid.deneb.enyo.de>
- Reply-to: Jakub Jelinek <jakub at redhat dot com>
On Sat, Oct 01, 2016 at 10:46:53PM +0200, Florian Weimer wrote:
> * Jakub Jelinek:
>
> > Now that GCJ is gone, I think we should remove the the tests for .jcr
> > sections from the crtfiles, which slows down (by a couple of instructions
> > and some relocations) every gcc compiled binary/library.
>
> Why were they needed *in every DSO* in the first place?
They aren't strictly needed, I guess it would be possible to add additional
crt files for the various compilation modes (-fgnu-tm, in the past linking
with gcj driver, etc.) and do the registration only there. But it is
actually implemented in the shared crt files, by looking at the section
sizes and testing weak undef function symbols.
> We still have _ITM_registerTMCloneTable, _ITM_deregisterTMCloneTable,
> and __gmon_start__ on amd64, which don't look terribly relevant for
> most users, either.
Jakub