Hello,
In arch.h there is a section:
#ifdef LWIP_PROVIDE_ERRNO
// errno codes
#endif /* LWIP_PROVIDE_ERRNO */
which defines unix errno codes used later in socket library. To
switch it on lwipopts.h should have #define LWIP_PROVIDE_ERRNO.
But it doesn't reference to anything else if CLIB already has its own
errno which could cause compilation problems. I think this definition
should be changed:
#ifdef LWIP_PROVIDE_ERRNO
// errno codes
#else
#include <errno.h>
#endif /* LWIP_PROVIDE_ERRNO */
Regards, Dmitri
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