Help with C++, gcc4.9 and libstdc++

[Fernando Apesteguía]

On Tue, Nov 29, 2016 at 9:28 PM, Fernando Apesteguía
<fernando.apesteguia at gmail.com> wrote:
> El 29 nov. 2016 18:58, "Rainer Hurling" <rhurlin at gwdg.de> escribió:
>>
>> Hi Fernando,
>>
>> Am 29.11.2016 um 17:50 schrieb Fernando Apesteguía:
>> > I maintain a port written mostly in C++ (cad/openvsp).
>> >
>> > This port used to compile fine in 11 and 10.x in both i386 and amd64.
>> > Since Nov 22nd I'm receiving a pkg-fallout for this port in 10.1. The
>> > port fails with this message:
>> >
>> > undefined reference to `__cxa_throw_bad_array_new_length'
>> >
>> > I assume the source of the problem is defaulting to gcc 4.9 in the
>> > ports and it seems to be related to libstdc++
>> >
>> > I use USES=compiler:gcc-c++11-lib in the Makefile since some c++11
>> > features are required. Any idea of why this could be failing to link?.
>> > What puzzles me is that it compiles fine with gcc 4.9 in 10.2.
>> >
>> > Thanks in advance.

Until that time comes, I would like to send an update but I'm having
some problems with it. I need a c++11 lib but I need gcc < 4.9 for the
port to compile on 10.1 (in < 10.x it doesn't build due to the lack of
certain math functions and in > 10.2 it compiles nicely). I've been
playing around with USE_GCC = 4.8 to no luck.

How can I specify both, gcc 4.8 specifically and still getting all the
work behing the gcc-c++11-lib ARG?

Thanks in advance.

>>
>> this also happens with a few other ports, and is described in
>>
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214863
>>
>> As far, as I understand, a patch with a workaround will be committed in
>> the next time.
>
> Thanks for the info!
>
>>
>> HTH,
>> Rainer