[dpdk-dev] weak functions in some drivers

Elo, Matias (Nokia - FI/Espoo) matias.elo at nokia-bell-labs.com
Thu Jun 30 10:40:05 CEST 2016

> >>> What is not clear to me is motivation to use weak here instead of simply
> >>> macro to exclude stubs in i40e_rxtx.c. It will make library smaller and avoid
> issues like this one
> >>> which are quite hard to troubleshoot.
> >> Since this issue seen in fd.io, I didn't investigated more, but I don't
> >> want to clock your valid question, this is an attempt to resurrect the
> >> question ...
> > Hi,
> >
> > We are having exactly the same problem. For us the aforementioned
> workaround doesn't seem to work and vector mode is always disabled with the
> i40e drivers. If I modify i40e_rxtx.c and exclude the stub functions using
> CONFIG_RTE_I40E_INC_VECTOR everything works as expected.
> >
> > We are building DPDK with the CONFIG_RTE_BUILD_COMBINE_LIBS option
> enabled and link DPDK library to our application.
> >
> > Any other ideas how this could be fixed?
> >
> > Regards,
> > Matias
> >
> So you have tried to link a combined static lib with --whole-archive
> -ldpdk --no-whole-archive and still get the wrong/weak function definition?
> Sergio

I actually just managed to fix the problem. In our case I had to add
'-Wl,--whole-archive,-ldpdk,--no-whole-archive'  to the end of AM_LDFLAGS.


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