[Buildroot] [git commit] czmq: unbreak static linking

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Peter Korsgaard,

On Tue, 12 May 2015 21:30:31 +0200, Peter Korsgaard wrote:

>  > I continue to remain unhappy with such changes. There are two options
>  > here:
> 
> I agree that it would be better if we could get this kind of fixes
> upstream. I don't know how receptive upstream will be as this doesn't
> affect "normal people" though.

Well, upstream zeromq should be able to accept patches making their .pc
file more correct.

>  >  * Either using gcc to link with a C++ library is incorrect, and czmq
>  >    should be fixed to use g++.
> 
> That is arguable correct, but things are a bit more complicated as:
> 
> - libzerozmq is written in C++ and uses libstdc++ but exposes a C api
> - czmq is a higher level wrapper also written in C
> - Test program (czmq_selftest) is a C program linking against libczmq
>   (and in term libzeromq)

Right, but that still doesn't answer whether using gcc to link a
C program against a C++ library is correct or not :-)

>  >  * Or using gcc to link with a C++ library is correct, and in this
>  >    case, libzmq.pc should be fixed to include -lstdc++ in Libs.private.
> 
> While this is correct, it is not directly related to this. Czmq doesn't
> use its own .pc file to know how to link the selftest program.

I'm not talking about fixing the czmq .pc file, but the zeromq one. If
zeromq uses C++, then its .pc file should have -lstdc++, no?

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com