Removed LWIP_SOCKET_SET_ERRNO - errno is always set - if it doesn't exist, it must be provided by the port

src/include/lwip/opt.h

@@ -1849,13 +1849,6 @@
 #define LWIP_SOCKET                     1
 #endif
 
-/** LWIP_SOCKET_SET_ERRNO==1: Set errno when socket functions cannot complete
- * successfully, as required by POSIX. Default is POSIX-compliant.
- */
-#if !defined LWIP_SOCKET_SET_ERRNO || defined __DOXYGEN__
-#define LWIP_SOCKET_SET_ERRNO           1
-#endif
-
 /**
  * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names through defines.
  * LWIP_COMPAT_SOCKETS==2: Same as ==1 but correctly named functions are created.

src/include/lwip/priv/sockets_priv.h

@@ -90,13 +90,9 @@ struct lwip_sock {
 #endif
 };
 
-#if LWIP_SOCKET_SET_ERRNO
 #ifndef set_errno
 #define set_errno(err) do { if (err) { errno = (err); } } while(0)
 #endif
-#else /* LWIP_SOCKET_SET_ERRNO */
-#define set_errno(err)
-#endif /* LWIP_SOCKET_SET_ERRNO */
 
 #if !LWIP_TCPIP_CORE_LOCKING
 /** Maximum optlen used by setsockopt/getsockopt */