For 20 years all worked well with my cross platform approach. As far as POSIX I use my own declarations and never #include socket.h, ever. My code compiled against them and linked into the system on several platforms.

But now, seems there must be some trick to prevent new strict XCode behavior from comparing my declarations against socket.h that I never used, ever, and find them incompatible.

I use void* anywhere they use any other argument type.

This now does not work. Your help is required as I have never been more clueless.

int     TLL send(SockNum s, vptr buf, int len, int flgs);
int     TLL sendto(SockNum s, vptr buf, int len, int flgs, vptr to, int tolen);
int     TLL recv(SockNum s, vptr buf, int len, int flgs);
int     TLL recvfrom(SockNum s, vptr buf, ulong len, ulong flags, vptr from, vptr fromlen);

Where #define TLL is empty string for Mac and declspec for Windows. It worked for 20 years.

C/C++ allows for generic declarations where void* is ok for any pointer.