hi chai,

My problem is: 

If I use gcc4.8.5 in centos7, every thing is ok, librados works well;

but, If I use gcc5.4.0 in centos7, and link error show up: unresolved librados::IoCtx::xx etc...;

So I try to recompile my project with  -D_GLIBCXX_USE_CXX11_ABI=0, every thing goes ok again.

So I conclusion it may because of librados.so is not compiled by gcc5 or higher.

===========my need:

Since -D_GLIBCXX_USE_CXX11_ABI=0 is not good, 

Can ceph just provide a version of : librados-devel, 

which I can just yum install, and compile without add ABI =0 to my project??

==========my dev info:

librados-devel.x86_64 2:13.2.6-0.el7 

centos7

gcc5.4.0

best regards,

lyn

+ dev@ceph.io

On Tue, Jun 4, 2019 at 1:59 PM 安安静静 <2741248158@qq.com> wrote:
>
> Hi chai,
>
> When I : yum install librados2-devel
> All librados2-devel versions are build by gcc 4.9 or older,

lyn, before starting the discussion, i'd like have more context:

where is the librados2-devel package downloaded from?
and what is the version ?

i guess you are referencing the librados2-devel packages from
http://download.ceph.com, and it is built for CentOS7 . i am not sure
how you went to the conclusion that we build ceph using GCC 4.9.
actually, we are using GCC-8 for building Ceph in master.

>
> but most c++ project uses gcc5.0 or higher,

good to learn. and quotation needed.

>
> this make me have to change all other c++ sources rebuild with : -D_GLIBCXX_USE_CXX11_ABI=0

see http://docs.ceph.com/docs/master/dev/cxx/.

>
> this is realy confused me,
>
> Can ceph provide a version of  librados2-devel build by gcc5.0 or higher?
>
> best regards,
>
> lyn