[LLVMdev] [RFC] Raising minimum required Visual Studio version to 2013 for trunk

[Chris Bieneman]

Sent from my iPad

> On Aug 21, 2014, at 4:48 PM, Michael Spencer <bigcheesegs at gmail.com> wrote:
> 
>> On Thu, Aug 21, 2014 at 4:35 PM, Chris Bieneman <beanz at apple.com> wrote:
>> This thread hasn’t had too much traffic, but it sounds like many people are
>> in favor and there is no strong opposition. If I understand Aaron’s only
>> objection was based on preserving existing policy rather than a technical
>> reason.
>> 
>> Anyone want to make the official call?
>> 
>> -Chris
> 
> We came up with this policy because certain people in the community
> wanted more time to test and move to new compilers. Those people
> haven't had any input on this thread yet, so I would rather we not
> jump ahead without being sure nobody is still depending on VS 2012. I
> actually need to verify that we're not still depending on it
> internally.

This is the primary reason i started this thread, and nobody has yet said they are still depending on it.

-Chris

> 
> - Michael Spencer
> 
>> 
>> On Aug 21, 2014, at 4:16 PM, Reid Kleckner <rnk at google.com> wrote:
>> 
>> +1 for 2013. The feature set is worth it.
>> 
>> I expect that there will still be major incompatibilities around initializer
>> lists, so I would avoid them unless you have MSVC or are OK with diagnosing
>> the problem from a buildbot.
>> 
>> 
>> On Tue, Aug 19, 2014 at 11:12 AM, Renato Golin <renato.golin at linaro.org>
>> wrote:
>>> 
>>> I just broke a build by committing initializer list and a few other
>>> C++11 stuff on the LoopVectorizer... :/
>>> 
>>> cheers,
>>> --renato
>>> 
>>> PS: The lld Windows bot is 2011, so that surely needs upgrading anyway...
>>> 
>>>> On 19 August 2014 00:48, David Blaikie <dblaikie at gmail.com> wrote:
>>>> For my money: variadic templates and some bug I hit when trying to use
>>>> forward_as_tuple.
>>>> 
>>>>> On Aug 18, 2014 4:02 PM, "Aaron Ballman" <aaron at aaronballman.com> wrote:
>>>>> 
>>>>> On Mon, Aug 18, 2014 at 6:54 PM, Chris Bieneman <beanz at apple.com>
>>>>> wrote:
>>>>>> I’d like to propose raising the minimum required compiler for the
>>>>>> LLVM &
>>>>>> Clang trunks for Visual Studio to MSVC 2013.
>>>>>> 
>>>>>> Doing this will allow us to take advantage of a bunch of C++11
>>>>>> features
>>>>>> that are not supported by MSVC 2012. According to MSDN
>>>>>> (http://msdn.microsoft.com/en-us/library/hh567368.aspx) the list is:
>>>>>> 
>>>>>> * Non-static data member initializers
>>>>>> * Variadic templates
>>>>>> * Initializer lists
>>>>>> * Default template arguments for function templates
>>>>>> * Expression SFINAE
>>>>>> * Alias templates
>>>>>> * Delegating constructors
>>>>>> * Explicit conversion operators
>>>>>> * Raw string literals
>>>>>> * Defaulted and deleted functions
>>>>>> 
>>>>>> Questions, comments, concerns, general feedback?
>>>>> 
>>>>> We shifted the minimum MSVC version to 2012 in January of this year,
>>>>> and have run into only a few issues where C++11 features exist in MSVC
>>>>> 2013 but not MSVC 2012. So I'm wondering what problem this solves in
>>>>> practice for our code base?
>>>>> 
>>>>> Personally, I use MSVC 2013 instead of 2012. But I would hesitate to
>>>>> switch to 2013 as the minimum supported version just yet. It's been
>>>>> out for less than two years and until "14" drops, it is the newest
>>>>> version of the compiler. When we made the switch, the goal was to
>>>>> support only the last two versions of MSVC, and I don't see any strong
>>>>> evidence to support expediting that schedule. I think this is a great
>>>>> plan for when "14" is officially released.
>>>>> 
>>>>> ~Aaron
>>>>> 
>>>>> _______________________________________________
>>>>> LLVM Developers mailing list
>>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>> 
>>>> 
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