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Subject: Re: [boost] [regression runner] Preference libstdc++ vs. libc++
From: Edward Diener (eldiener_at_[hidden])
Date: 2017-03-07 20:58:04

On 3/7/2017 2:18 PM, Bo Persson via Boost wrote:
> On 2017-03-07 20:01, Edward Diener via Boost wrote:
>> On 3/7/2017 12:12 PM, Niall Douglas via Boost wrote:
>>> On 07/03/2017 16:48, Edward Diener via Boost wrote:
>>>> On 3/7/2017 9:47 AM, Niall Douglas via Boost wrote:
>>>>>> The problem with clang targeting the MSVC ABI, as far as Boost is
>>>>>> concerned, is that it erroneously implements the non-standard VC++
>>>>>> preprocessor. This makes it all but useless for using with Boost.
>>>>>> That
>>>>>> it should have even been designed to do this for all macros, rather
>>>>>> than
>>>>>> just for the macros it needed when processing VC++ and Windows
>>>>>> headers,
>>>>>> is its major downfall. When you have to emulate something that is
>>>>>> already non-standard, and for which no internal knowledge is
>>>>>> available,
>>>>>> you are already on the wrong path.
>>>>> You can tell C2 clang to not use MSVC compatibility and VS2015
>>>>> Update 2
>>>>> and later's headers will now compile cleanly. I would assume VS2017 is
>>>>> the same.
>>>> Where is C2/clang available for download ? It seems the only thing that
>>>> is not mentioned in the C2/clang blogs. Nice going Microsoft !
>>> In the VS2017 installer, you just choose C2 clang just as you would any
>>> other component.
>> Your mention of VS2015 Update 2 above led me to think it was some
>> downloadable software available for that product. Now I realize that it
>> is available for VS2017 currently being launched. So much hubbub for a
>> product which is just now being officially made available has confused
>> me. I have this bad habit of waiting until some software actually
>> officially exists and can be used before I become interested in it.
>> Excuse me <g> !
> It is available in the VS2015 installer as well. And has been all the time.

You are right. I missed it when installing. It is called "Clang with
Microsoft codegen" in the VS2015 install.

> But if you want to try it out now, from today VS2017 would be the
> obvious choice. :-)

Understood. Thanks !

> Bo Persson

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