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Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]

From: Jeff Law <law at redhat dot com>
To: Cary Coutant <ccoutant at gmail dot com>, Michael Matz <matz at suse dot de>
Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, "Maciej W. Rozycki" <macro at imgtec dot com>, Alan Modra <amodra at gmail dot com>, Richard Biener <richard dot guenther at gmail dot com>, Joe Groff <jgroff at apple dot com>, Binutils <binutils at sourceware dot org>, GCC <gcc at gcc dot gnu dot org>
Date: Mon, 25 Apr 2016 11:24:12 -0600
Subject: Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
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On 04/18/2016 11:55 AM, Cary Coutant wrote:

That is why protected visibility is such a mess.


Not mess, but it comes with certain limitations.  And that's okay.  It's
intended as an optimization, and it should do that optimization if
requested, and error out if it can't be done for whatever reason.


I completely agree.

ISTM this ought to be the guiding principle here, with the additionalcaveat that if one of the limitations is tickled that we issue a gooddiagnostic.

The current situation (gcc-5, gcc-6-rc) essentially de-optimizesprotected systems in an attempt to work around the various limitationsof protected symbols. Reverting that change is, IMHO, what needs tohappen. My worry is that we're so damn late in the gcc-6 cycle that itmay need to be deferred to 6.2 or beyond.


Jeff

Follow-Ups:
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: H.J. Lu

References:
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: Jeff Law
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: H.J. Lu
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: Richard Biener
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: Alan Modra
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: H.J. Lu
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: Maciej W. Rozycki
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: H.J. Lu
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: Michael Matz
- Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
  - From: Cary Coutant

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