samples: net: capture: avoid net_ip.h conflicts with CONFIG_NATIVE_LIBC
The net capture sample is likely one application that does rely on linking
against the native C library rather than Picolibc, since it needs to hook
into Linux's tun / tap interfaces.
However, after removing `<zephyr/posix/...h>` from the default search
path, a number of conflicts appear between the native libc socket types
and Zephyr's in `net_ip.h`.
Issue 97050 already captures this partially. However, there seems to be
some confusion about POSIX headers and types and ISO C headers and types.
There are C libraries that do not include all of the necessary POSIX
headers and types that Zephyr depends on. For example:
* minimal libc
* IAR
* newlib
* picolibc
The latter two might surprise some.
In any case, the work required to properly namespace `net_ip.h` constants
and types is well out of the scope of the current release cycles, so this
small workaround should suffice.
A non-exhaustive list of constants and types from `net_ip.h` that conflict
with native types are
* PF_INET
* PF_INET6
* PF_PACKET
* PF_CAN
* PF_LOCAL
* SOCK_STREAM
* SOCK_DGRAM
* SOCK_RAW
* struct iovec
* struct msghdr
* struct cmsghdr
* struct sockaddr
* struct sockaddr_storage
A non-exhaustive list of errors that arise are of the form(s) below:
```shell
In file included from $HOME/../zephyr/net/ethernet.h:21,
from $HOME/../samples/net/capture/src/main.c:15:
../zephyr/net/net_ip.h:45: warning: "PF_INET" redefined
45 | #define PF_INET 1 /**< IP protocol family version 4. */
|
/usr/include/bits/socket.h:45: note: this is the location of the previous \
definition
45 | #define PF_INET 2 /* IP protocol family. */
|
In file included from /usr/include/bits/socket.h:38:
$HOME/zephyrproject/zephyr/include/zephyr/net/net_ip.h:89:9: error: \
redeclaration of enumerator ‘SOCK_STREAM’
89 | SOCK_STREAM = 1, /**< Stream socket type */
| ^~~~~~~~~~~
/usr/include/bits/socket_type.h:26:3: note: previous definition of \
‘SOCK_STREAM’ with type ‘enum __socket_type’
26 | SOCK_STREAM = 1, /* Sequenced, reliable,...
| ^~~~~~~~~~~
$HOME/zephyrproject/zephyr/include/zephyr/net/net_ip.h:250:8: error: \
redefinition of ‘struct iovec’
250 | struct iovec {
| ^~~~~
In file included from /usr/include/sys/socket.h:26:
/usr/include/bits/types/struct_iovec.h:26:8: note: originally defined here
26 | struct iovec
| ^~~~~
```
Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
1 file changed
