Re: [dpdk-stable] [PATCH] ethdev: missing typecast from void in eth_dev_pci_specific_init

[Thomas Monjalon <thomas@monjalon.net>]

10/04/2019 22:58, David Christensen:
> > This is a duplicate of this patch:
> > 
> > https://patches.dpdk.org/patch/52505/
> > 
> > You are from 2 different Linux teams at IBM,
> > you hit the same issue at the same time,
> > you both miss to give an explanation,
> > funny.
> 
> We both work for infrastructure teams who are supporting a project team 
> that is developing a DPDK application that runs across multiple CPU 
> architectures and encountered the error.
> 
> The error comes from g++ (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0:
> 
> [CXX]       g++ -o utils/pcap_handle.o -c utils/pcap_handle.cc -g3 
> -ggdb3 -mcpu=native -mtune=native -isystem 
> /home/rchirra/gen/io/ppc64include -std=gnu++11 -flax-vector-conversions 
> -Werror -isystem /home/rchirra/gen/io
> 
> In file included from drivers/pmd.cc:7:0:
> /home/rchirra/gen/io/deps/dpdk/build/include/rte_ethdev_pci.h:
> In function ‘int eth_dev_pci_specific_init(rte_eth_dev*, void*)’:
> /home/rchirra/gen/io/deps/dpdk/build/include/rte_ethdev_pci.h:75:35: 
> error: invalid conversion from ‘void*’ to ‘rte_pci_device*’ [-fpermissive]
>    struct rte_pci_device *pci_dev = bus_device;
>                                     ^~~~~~~~~~
> make[1]: *** [drivers/pmd.o] Error 1
> 
> Do you believe that more permissive compiler flags are the better answer?

No, we should not force any compiler flag of the application.
We are even trying to support pedantic flags in the app.
So it seems we must fix it.

We just need to change the title to mention it fixes the build for C++,
and add the error message in the body.