[EXTERNAL] [RFC v3 3/3] examples: add lcore topology API calls

[Varghese, Vipin]

Snipped

> > > >
> > > > I see compilation failure on ARM platforms due to missing header include.
> > > >
> > > > ../examples/helloworld/main.c: In function 'parse_topology':
> > > > ../examples/helloworld/main.c:83:13: error: implicit declaration
> > > > of function 'strtoul'; did you mean 'strtok'? [-Wimplicit-function-declaration]
> > > >    83 |         n = strtoul(q_arg, &end, 10);
> > > >       |             ^~~~~~~
> > > >       |             strtok
> > > > ../examples/helloworld/main.c:83:13: warning: nested extern
> > > > declaration of 'strtoul' [- Wnested-externs]
> > > > ../examples/helloworld/main.c: In function 'helloworld_parse_args':
> > > > ../examples/helloworld/main.c:115:42: error: 'EXIT_FAILURE'
> > > > undeclared (first use in this function)
> > > >   115 |                                 rte_exit(EXIT_FAILURE, "Invalid Topology
> > > selection\n");
> > > >       |                                          ^~~~~~~~~~~~
> > > > ../examples/helloworld/main.c:13:1: note: 'EXIT_FAILURE' is
> > > > defined in header '<stdlib.h>'; this is probably fixable by adding '#include
> <stdlib.h>'
> > > >    12 | #include <rte_memory.h>
> > > >   +++ |+#include <stdlib.h>
> > > >    13 | #include <rte_launch.h>
> > > > ../examples/helloworld/main.c:115:42: note: each undeclared
> > > > identifier is reported only once for each function it appears in
> > > >   115 |                                 rte_exit(EXIT_FAILURE, "Invalid Topology
> > > selection\n");
> > > >       |                                          ^~~~~~~~~~~~
> > > > ../examples/helloworld/main.c: In function 'main':
> > > > ../examples/helloworld/main.c:153:26: error: 'EXIT_FAILURE'
> > > > undeclared (first use in this function)
> > > >   153 |                 rte_exit(EXIT_FAILURE, "Invalid arguments\n");
> > > >       |                          ^~~~~~~~~~~~
> > > > ../examples/helloworld/main.c:153:26: note: 'EXIT_FAILURE' is
> > > > defined in header '<stdlib.h>'; thi
> > > >
> > > > Below header include should fix it.
> > > >
> > > > diff --git a/examples/helloworld/main.c
> > > > b/examples/helloworld/main.c index
> > > > 9845c3775c3a..f49bd0108f74 100644
> > > > --- a/examples/helloworld/main.c
> > > > +++ b/examples/helloworld/main.c
> > > > @@ -3,6 +3,7 @@
> > > >   */
> > > >
> > > >  #include <stdio.h>
> > > > +#include <stdlib.h>
> > > >  #include <string.h>
> > > >  #include <stdint.h>
> > > >  #include <errno.h>
> > >
> > > Thank you for helping me here, I did run with `check_includes &
> > developer_mode`,
> > > it did not throw this error.
> > > Before patch submission I tried `devtools/test-meson-builds.sh` too.
> > > I think
> > internally
> > > this is not using ` check_includes & developer_mode `.
> > > Let me recheck and fix this in version 4.
> >
> > Thank you, I found the reason for my miss on this.
> >
> > When build using cross compiler manually, no issues with the steps ```
> > meson arm64-build --cross-file config/arm/arm64_armv8_linux_gcc ninja
> > -C arm64-build cd example/helloworld make ```
> >
> > But building using cross compiler with examples manually, no issues
> > with the steps ``` meson arm64-build --cross-file
> > config/arm/arm64_armv8_linux_gcc - Dexamples=helloworld ninja -C
> > arm64-build ```
> >
> 
> I generally run ./devtools/test-meson-builds.sh as a catch all 😊

Thank you sharing v4 with fix