[dpdk-dev] "virtual" C++ keyword used in rte_devargs.h and causes compilation error in C++

[Ariel Rodriguez]

"virtual" is a reserved word in c++. When the c++ compiler "g++" use that
header in a "extern way (just generate standard typo for function
identifiers)", there`s not way that the compiler posible "turn off" the
"virtual" reserved  word. If, for example, you guys use the "new" word ...
its just the same as virtual.

Regards.

On Sun, Feb 8, 2015 at 3:33 AM, Ming Zhao <mzhao at luminatewireless.com>
wrote:

> In fact the current rte_devargs.h header is enclosed inside  extern C {}
> block already. But it looks like it's not sufficient. Also there is also
> the case that rte_devargs.virtual field could be accessed inside a cpp
> file.
>
> On 02/07/2015 12:23 PM, Neil Horman wrote:
> > On Fri, Feb 06, 2015 at 11:24:15PM -0800, Ming Zhao wrote:
> >> The code is in rte_devargs.h:
> >>
> >> rte_devargs.h:
> >>
> >>                 /** Used if type is RTE_DEVTYPE_VIRTUAL. */
> >>                 struct {
> >>                         /** Driver name. */
> >>                         char drv_name[32];
> >>                 } virtual;
> >>         };
> >>
> >> Which caused clang compiler to report error when this file is included
> >> by a cpp file, the error message is:
> >>
> >> In file included from net/dpdk/testing/base-test.cc:3:
> >> In file included from net/dpdk/testing/base-test.h:8:
> >> third-party/dpdk/lib/librte_eal/common/include/rte_devargs.h:89:5:
> >> error: 'virtual' can only appear on non-static
> >>       member functions
> >>                 } virtual;
> >>                   ^
> >>
> >> I think we should try to pick another name for this field. I would
> >> suggest calling it "vdev" instead, or I'll be happy to take another name
> >> if someone comes with a different idea.
> >>
> >> Thanks!
> >> Ming
> >>
> > You could do that, but it seems like it shouldn't be necessecary.
> Shouldn't the
> > solution just be to encapsulate either the header file or the #include
> directive
> > from the C++ file with extern C { }?
> > Neil
> >
>