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Gmane
From: Chris Bieneman <cbieneman <at> apple.com>
Subject: Re: [cfe-dev] [RFC] Raising LLVM minimum required MSVC version to 2013 for trunk
Newsgroups: gmane.comp.compilers.llvm.devel
Date: Friday 30th January 2015 23:51:47 UTC (over 3 years ago)
+Alex Bradbury

Sounds to me like we have no known users still on VS 2012.

So, how about we plan to move forward again with Chandler’s proposal for
making this transition. For those who don’t want to dig through to the
beginning here’s the basic plan:

1) Loop in cfe-dev and lldb-dev (Done!)
2) Wait until this email fully circulates in digests and LLVM Weekly so
that everyone who has an objection can voice it
3) If there are no objections, Commit a change to the CMake build which
errors on old MSVC versions
4) Revert and fix buildbots
5) Repeat 3 & 4 until no issues
6) Once the change is live for a week with no issues, update the
documentation to reflect the minimum required MSVC version as 2013

Alex, can you please make sure that this plan makes it into the next LLVM
Weekly? If there are no objections this time I will update CMake files a
few days after the LLVM Weekly goes out.

Thanks Greg and Aaron for keeping this thread going.

-Chris


> On Jan 28, 2015, at 8:11 AM, Aaron Ballman 
wrote:
> 
> If we have no other major users who require VS 2012 support, I think
> it's reasonable to officially switch now. We might want to wait for
> 3.6 to go out the door, just to reduce possible issues with porting
> fixes, but that may be overly cautious.
> 
> ~Aaron
> 
> On Wed, Jan 28, 2015 at 7:16 AM, Greg Bedwell 
wrote:
>> This thread seems to have stalled again without resolution :).  Is there
>> anything else left blocking this change?  We've had our PS4 toolchain
builds
>> switched over to VS2013 since I reported back in October without any
issues.
>> 
>> -Greg
>> 
>> On 8 October 2014 at 18:35, Aaron Ballman 
wrote:
>>> 
>>> On Wed, Oct 8, 2014 at 12:17 PM, Greg Bedwell 
>>> wrote:
>>>> Hi,
>>>> 
>>>> To follow up from Paul last week:
>>>> 
>>>>> I'm expecting to have our internal builds switched over later this
>>>>> week.  Our investigations have shown no problems.
>>>> 
>>>> We've now updated our internal builds from 2012.4 (cl.exe 17.0.61030)
to
>>>> 2013.3 (cl.exe 18.00.30723).  Our automated testing over the weekend
>>>> hasn't
>>>> shown any correctness issues so we plan to continue using it now..
>>>> 
>>>> From some of the stats I've collected it seems to be a worthwhile
>>>> update.
>>>> On my own machine, the time for a full rebuild from clean of ALL_BUILD
>>>> (LLVM
>>>> & Clang, Release + asserts + debug info, not using ninja) has improved
>>>> by
>>>> 20%.  Doing a like-for-like build of various benchmarks and games
using
>>>> clang built by VS2012 and VS2013, the clang build speed of a typical
-O2
>>>> -g
>>>> build is somewhere between in the noise and 1% faster with VS2013.
>>>> We've
>>>> not yet observed any regressions in the speed of clang since
upgrading.
>>> 
>>> Great, thank you for the feedback!
>>> 
>>> ~Aaron
>> 
>> 


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