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-rw-r--r--c/src/libchip/serial/ns16550.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/c/src/libchip/serial/ns16550.c b/c/src/libchip/serial/ns16550.c
index b0aa38ff92..2c3bc9496e 100644
--- a/c/src/libchip/serial/ns16550.c
+++ b/c/src/libchip/serial/ns16550.c
@@ -132,7 +132,9 @@ NS16550_STATIC int ns16550_set_attributes(
const struct termios *t
);
-NS16550_STATIC void ns16550_isr(void *arg);
+#if defined(BSP_FEATURE_IRQ_EXTENSION) || defined(BSP_FEATURE_IRQ_LEGACY)
+ NS16550_STATIC void ns16550_isr(void *arg);
+#endif
static rtems_interrupt_lock ns16550_lock =
RTEMS_INTERRUPT_LOCK_INITIALIZER("NS16550");