> On Jan 25, 2016, at 09:29, Mojca Miklavec <mo...@macports.org> wrote:
>
> On 25 January 2016 at 18:11, Jeremy Huddleston Sequoia wrote:
>>> On Jan 25, 2016, at 08:04, Michael Dickens wrote:
>>>
>>> We've had this discuss before, how to do C++11 for libstdc++ and libc++.
>>>
>>> The cxx11 PortGroup implements C++11 compliance for libc++ only. It
>>> errors out when using libstdc++.
>>>
>>> What Mojca is asking is whether we can add an implementation for when
>>> using libstdc++
>>
>> "libstdc++" means /usr/lib/libstdc++.6.dylib, and it doesn't support C++11,
>> so it is not possible to use the system libstdc++ for C++11 code. I don't
>> think we want to start supporting people using
>> ${prefix}/lib/libstdc++.6.dylib from libgcc as that is quite untested and
>> aiming for a world of hurt.
>
> Just to clarify. I don't want to "support" anyone building C++11 code
> against /usr/lib/libstdc++.6.dylib.
>
> I would like to support building C++11 code against libc++ for users
> who have not modified their stdlib setting yet (that includes the
> buildbots) and for a small subset of ports where doing that doesn't
> actually lead to crashes and problems. Examples include clang-3.7,
> root6 etc.
What about something like cxx11.no_abi_boundary which would do what we do in
clang:
configure.cxx_stdlib libc++
depends_lib-append port:libcxx
instead of the error message?
Both cases would benefit from the group's blacklist while allowing for both use
cases.
> But I agree that one can in principle do that without the portgroup.
>
> (Even more than that I would really like to see the buildbots with
> libc++ as their default stdlib being set up.)
>
> Then again ... the longer we postpone this action, the less people
> will feel that it would have to be done at all and the smaller the
> chances will be that we would be able to fix remaining problems.
>
> Mojca
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