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-rw-r--r--lib/setup_once.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/setup_once.h b/lib/setup_once.h
index 751102bed..4f7d0d791 100644
--- a/lib/setup_once.h
+++ b/lib/setup_once.h
@@ -490,5 +490,21 @@ typedef int sig_atomic_t;
#define ZERO_NULL 0
+
+/*
+ * Ensure that Winsock and lwIP TCP/IP stacks are not mixed.
+ */
+
+#if defined(__LWIP_OPT_H__)
+# if defined(SOCKET) || \
+ defined(USE_WINSOCK) || \
+ defined(HAVE_ERRNO_H) || \
+ defined(HAVE_WINSOCK_H) || \
+ defined(HAVE_WINSOCK2_H) || \
+ defined(HAVE_WS2TCPIP_H)
+# error "Winsock and lwIP TCP/IP stack definitions shall not coexist!"
+# endif
+#endif
+
#endif /* __SETUP_ONCE_H */