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List: cfe-dev
Subject: Re: [cfe-dev] Clangs equivalent to GCCs -Og flag?
From: "Robinson, Paul" <Paul_Robinson () playstation ! sony ! com>
Date: 2015-07-31 14:27:00
Message-ID: E3B07FDB86BFF041819DC057DEED8FEABDC99B55 () USCULXMSG04 ! am ! sony ! com
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People ask about this from time to time, but we've never done anything about it.
One thing I noticed about GCC –Og is that it's 99% identical to their –O1. I'd \
be curious about people's experience using Clang –O1 –g and whether that \
experience is somewhere close to reasonable.
--paulr
From: cfe-dev-bounces@cs.uiuc.edu [mailto:cfe-dev-bounces@cs.uiuc.edu] On Behalf Of \
David Blaikie
Sent: Wednesday, July 29, 2015 10:13 AM
To: Dan Walmsley; cfe-dev Developers
Subject: Re: [cfe-dev] Clangs equivalent to GCCs -Og flag?
On Wed, Jul 29, 2015 at 8:42 AM, Dan Walmsley \
<dan@walms.co.uk<mailto:dan@walms.co.uk>> wrote: Thanks,
Perhaps there might be some documentation somewhere that would give me an idea of \
which optimizations to enable individually?
Not really - optimized debug info is still pretty lacking in Clang. Even the most \
common/basic optimizations (SROA, for example) are going to pretty heavily impact \
debuggability today.
- Dave
Dan
________________________________
Date: Wed, 29 Jul 2015 06:40:06 -0700
Subject: Re: [cfe-dev] Clangs equivalent to GCCs -Og flag?
From: dblaikie@gmail.com<mailto:dblaikie@gmail.com>
To: dan@walms.co.uk<mailto:dan@walms.co.uk>
CC: cfe-dev@cs.uiuc.edu<mailto:cfe-dev@cs.uiuc.edu>
On Jul 29, 2015 3:23 AM, "Dan Walmsley" <dan@walms.co.uk<mailto:dan@walms.co.uk>> \
wrote:
>
> GCC has a debug level flag of -Og which enables all optimizers that won't degrade \
> the debugging experience greatly.
> Does clang have an equivalent?
No, clang had no equivalent at this time.
>
> Thanks in advance.
>
> Dan
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev@cs.uiuc.edu<mailto:cfe-dev@cs.uiuc.edu>
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
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<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">People \
ask about this from time to time, but we've never done anything about \
it.<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">One \
thing I noticed about GCC –Og is that it's 99% identical to their –O1. I'd \
be curious about people's experience using Clang –O1 –g and whether that \
experience is somewhere close to reasonable.<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--paulr<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span \
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style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> \
cfe-dev-bounces@cs.uiuc.edu [mailto:cfe-dev-bounces@cs.uiuc.edu] <b>On Behalf Of \
</b>David Blaikie<br> <b>Sent:</b> Wednesday, July 29, 2015 10:13 AM<br>
<b>To:</b> Dan Walmsley; cfe-dev Developers<br>
<b>Subject:</b> Re: [cfe-dev] Clangs equivalent to GCCs -Og \
flag?<o:p></o:p></span></p> </div>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jul 29, 2015 at 8:42 AM, Dan Walmsley <<a \
href="mailto:dan@walms.co.uk" target="_blank">dan@walms.co.uk</a>> \
wrote:<o:p></o:p></p> <div>
<div>
<div>
<p class="MsoNormal">Thanks, <o:p></o:p></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal"> Perhaps there might be some documentation \
somewhere that would give me an idea of which optimizations to enable \
individually?<o:p></o:p></p> </div>
</div>
</div>
<div>
<p class="MsoNormal"><br>
Not really - optimized debug info is still pretty lacking in Clang. Even the most \
common/basic optimizations (SROA, for example) are going to pretty heavily impact \
debuggability today.<br> <br>
- Dave<br>
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Dan<o:p></o:p></p>
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<p class="MsoNormal">Date: Wed, 29 Jul 2015 06:40:06 -0700<br>
Subject: Re: [cfe-dev] Clangs equivalent to GCCs -Og flag?<br>
From: <a href="mailto:dblaikie@gmail.com" target="_blank">dblaikie@gmail.com</a><br>
To: <a href="mailto:dan@walms.co.uk" target="_blank">dan@walms.co.uk</a><br>
CC: <a href="mailto:cfe-dev@cs.uiuc.edu" \
target="_blank">cfe-dev@cs.uiuc.edu</a><o:p></o:p></p> <div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<p><br>
On Jul 29, 2015 3:23 AM, "Dan Walmsley" <<a \
href="mailto:dan@walms.co.uk" target="_blank">dan@walms.co.uk</a>> wrote:<br> \
><br> > GCC has a debug level flag of -Og which enables all optimizers that \
won't degrade the debugging experience greatly.<br> ><br>
> Does clang have an equivalent?<o:p></o:p></p>
<p>No, clang had no equivalent at this time.<o:p></o:p></p>
<p>><br>
> Thanks in advance.<br>
><br>
> Dan<br>
><br>
> _______________________________________________<br>
> cfe-dev mailing list<br>
> <a href="mailto:cfe-dev@cs.uiuc.edu" target="_blank">cfe-dev@cs.uiuc.edu</a><br>
> <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev" \
target="_blank">http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev</a><br> \
><o:p></o:p></p> </div>
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