Re: Adding c++11 support to USE_LANGUAGES

[Ryo ONODERA <ryo_on%yk.rim.or.jp@localhost>]

Hi,

From: Jonathan Perkin <jperkin%joyent.com@localhost>, Date: Mon, 1 May 2017 08:10:37 +0100

> * On 2017-04-28 at 11:05 BST, Jonathan Perkin wrote:
> 
>> * On 2017-04-24 at 13:50 BST, Joerg Sonnenberger wrote:
>> 
>> > On Mon, Apr 24, 2017 at 02:07:17PM +0200, Edgar Fuß wrote:
>> > > Is C++n a superset of C++m for n>m?
>> > 
>> > Mostly. There are a couple of things that explicitly create problems for
>> > m == 2003 and there is the problem of at least one semantic change that
>> > can potentially result in miscompiled code (destructors are tagged as
>> > not throwing by default in 2011). For m>=2011 it should be transparent.
>> 
>> In that case what about something like this:
>> 
>>   https://github.com/joyent/pkgsrc/commit/e33dc10357d54315a5152ccd9895dde5e1d0f256
>> 
>> tl;dr: introduce CXX_REQD as a similar mechanism to GCC_REQD, packages
>> append to it what they need, then we distil it to the most recent
>> version and use that for the build.
> 
> Joerg suggested rolling this into USE_LANGUAGES instead.  I've done
> that here and kicked off a bulk build:
> 
>   https://github.com/joyent/pkgsrc/commit/f5841e6549988e345b4a3c5aad7f11d7906f1ea6
> 
> One of the issues I've realised is that neither this nor the CXX_REQD
> patch will work in bl3 files if compiler.mk has already been read.
> 
> I'm not sure there's a great solution for that, so at least
> integrating this into USE_LANGUAGES should get us existing pkglint
> warnings about setting it after compiler.mk.
> 
> Please help testing on NetBSD, especially with problematic packages
> like libreoffice, I don't yet have a fast NetBSD VM to test in.

I will test this change for mk/compiler.mk for misc/libreoffice
and www/firefox on NetBSD.

Thank you.

> -- 
> Jonathan Perkin  -  Joyent, Inc.  -  www.joyent.com

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