Re: Adding c++11 support to USE_LANGUAGES

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

Hi,

From: Ryo ONODERA <ryo_on%yk.rim.or.jp@localhost>, Date: Mon, 01 May 2017 16:48:16 +0900 (JST)

> 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.

With
CXX_REQD+=gnu++11
, misc/libreoffice builds fine on netbsd-7/amd64 and NetBSD/amd64-current.

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