Bug#777955: liblas: ftbfs with GCC-5

[Dimitri John Ledkov]

On 29 June 2015 at 17:11, Sebastiaan Couwenberg <sebastic at xs4all.nl> wrote:
>> Control: reopen -1
>> Control: severity -1 important
>>
>> On 06/28/2015 12:51 AM, Debian Bug Tracking System wrote:
>>> Using -D_GLIBCXX_USE_CXX11_ABI=0 allows liblas to build with GCC 5
>>> indeed.
>>
>> the goal should be to build everything using the new ABI, especially if
>> this is
>> a library package.
>
> So now what?
>
> As far as I understand, libLAS isn't affected, boost is. Because boost is
> not rebuilt with GCC 5, libLAS fails to build.
>
> But your reopening of this issue probably means my undestanding is incorrect.
>
> So I must conclude that I don't understand what I need to do to resolve
> this issue in libLAS, so please advice.
>


Iyay, can we please take things slow?! We have two transitions in
parallel (i) change compiler to a new version & (ii) change libstdc++
ABI.

In unstable - there is g++5 (i), but there isn't libstdc++ that
provides C++11 ABI (ii).

Boost is compiled with the default compiler & the default ABI. And
boost will be only rebuild, once the default compiler (i) and
libstdc++ ABI (ii) change in unstable.

So far I didn't yet had to rebuild boost with libstdc++ C++11 ABI (ii)
in experimental, to successfully build & link libraries and apps with
g++5 (i) and libstdc++ C++11 (ii).

To avoid any ambiguity, please provide full build-log with specific
details about the version of gcc-defaults, boost-defaults,
libboost1.5*-dev and libstdc++6 packages in use.
As currently in experimental: gcc-defaults 141, boost-defaults (from
sid), boost1.55 (from sid, compiled with 98 abi), libstdc++6
(5.1.1-21, with new C++11 abi) liblas compiles correctly without a
hitch, see the attached buildlog.

I'm happy to look into bug-reports about build-failures between these
set of packages, but note that a matching libstdc++6 must be used with
a matching g++ at compile time, otherwise one will see link errors if
any of the inline namespace dual-abi symbols are used (e.g.
std::__cxx11::string and etc).

Also please study the attached successful build log in experimental,
and let me know if there are any issues with it.

-- 
Regards,

Dimitri.
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