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-rw-r--r--extmod/misc.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/extmod/misc.h b/extmod/misc.h
index 80e5b59a0..8ea51a981 100644
--- a/extmod/misc.h
+++ b/extmod/misc.h
@@ -39,10 +39,12 @@ bool mp_os_dupterm_is_builtin_stream(mp_const_obj_t stream);
void mp_os_dupterm_stream_detached_attached(mp_obj_t stream_detached, mp_obj_t stream_attached);
uintptr_t mp_os_dupterm_poll(uintptr_t poll_flags);
int mp_os_dupterm_rx_chr(void);
-void mp_os_dupterm_tx_strn(const char *str, size_t len);
+int mp_os_dupterm_tx_strn(const char *str, size_t len);
void mp_os_deactivate(size_t dupterm_idx, const char *msg, mp_obj_t exc);
#else
-#define mp_os_dupterm_tx_strn(s, l)
+static inline int mp_os_dupterm_tx_strn(const char *s, size_t l) {
+ return -1;
+}
#endif
#endif // MICROPY_INCLUDED_EXTMOD_MISC_H