[PATCH v3 1/4] debug_uart: Replace debug functions with dummies if CONFIG_DEBUG_UART is not set

[Lukasz Czechowski]

In case DEBUG UART is not used, define dummy macros replacing
the actual function implementations that will not be available.
This allows to compile code and avoid linker errors.
Because the DEBUG_UART_FUNCS macro should not be used if
DEBUG UART is not available, redefine it to generate compilation
warning.

Signed-off-by: Lukasz Czechowski <lukasz.czechowski at thaumatec.com>

Reviewed-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Kever Yang <kever.yang at rock-chips.com>
---
 include/debug_uart.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/debug_uart.h b/include/debug_uart.h
index 714b369e6fe..dc0f1aa4c98 100644
--- a/include/debug_uart.h
+++ b/include/debug_uart.h
@@ -128,6 +128,8 @@ void printdec(unsigned int value);
 			(1 << CONFIG_DEBUG_UART_SHIFT), \
 		CONFIG_DEBUG_UART_SHIFT)
 
+#ifdef CONFIG_DEBUG_UART
+
 /*
  * Now define some functions - this should be inserted into the serial driver
  */
@@ -197,4 +199,18 @@ void printdec(unsigned int value);
 		_DEBUG_UART_ANNOUNCE \
 	} \
 
+#else
+
+#define DEBUG_UART_FUNCS \
+	#warning "DEBUG_UART not defined!"
+
+#define printch(ch) do{}while(0);
+#define printascii(str) do{}while(0);
+#define printhex2(value) do{}while(0);
+#define printhex4(value) do{}while(0);
+#define printhex8(value) do{}while(0);
+#define printdec(value) do{}while(0);
+
+#endif
+
 #endif
-- 
2.43.0