On 08/02/19 19:56 -0600, Patrick Diehl wrote: >Hi, > >I maintain the hpx package and it uses std:atomic and when I install >gcc-c++ it seems that libatomic is not a dependency of the gcc-c++ >package. My program fails, because it can not link against libatomic. Is >this the supposed behavior to install libatomic or should libatomic >become one of the dependencies of gcc-c++? Not all C++ programs need libatomic. If hpx needs it, I think you should require it explicitly.

On Mon, Feb 11, 2019 at 12:14:10PM +0100, Florian Weimer wrote: > * Jonathan Wakely: > > > On 08/02/19 19:56 -0600, Patrick Diehl wrote: > >>Hi, > >> > >>I maintain the hpx package and it uses std:atomic and when I install > >>gcc-c++ it seems that libatomic is not a dependency of the gcc-c++ > >>package. My program fails, because it can not link against libatomic. Is > >>this the supposed behavior to install libatomic or should libatomic > >>become one of the dependencies of gcc-c++? > > > > Not all C++ programs need libatomic. If hpx needs it, I think you > > should require it explicitly. > > Not all C++ programs need libstdc++ or librt. Yet both are available by > default. Don't know why you are mentioning librt, gcc-c++ nor libstdc++ don't have a dependency on librt, either rpm or DT_NEEDED. You have to try hard to avoid libstdc++, that is what you get by default, one needs to use -nostdinc, link with gcc instead of g++, usually disable rtti/exceptions etc. or link with -lsupc++ (which is in libstdc++-devel anyway). Compared to that, most of the C++ programs don't need libatomic, most of them don't need libitm, etc. So, why force it upon everybody when only 0.05% will need it?

On Tue, Feb 12, 2019 at 09:49:23AM +0000, Jonathan Wakely wrote: > On that basis, why does gcc-c++ install libgomp and libgfortran? I think gcc-c++ doesn't require libgfortran, gcc-gfortran does.

The reason to have libgomp in the dependencies was that it is a library that isn't explicitly used on the command line, while to link against libatomic you need to specify -latomic and so, like for any other random library you need to make sure that the library is installed, one doesn't need to specify -lgomp, simply linking with -fopenmp needs that library.