Build blinkt and piface in gcc pipeline to prevent bit rot. (#842)

apps/piface/Makefile

@@ -39,8 +39,12 @@ MCP23S17_LIB = libmcp23s17
 
 CFLAGS += -I$(PIFACE_INCLUDE)
 
+ifeq (${BUILD},pipeline)
+CFLAGS += -DBUILD_PIPELINE
+else
 LDPIFACE = -Wl,-L$(PIFACE_LIB),-lpifacedigital,-L$(MCP23S17_LIB),-lmcp23s17
 LFLAGS += $(LDPIFACE)
+endif
 
 OBJS += ${SRC:.c=.o}
 

apps/piface/main.c

@@ -1,11 +1,10 @@
 /**
  * @file
- * @brief
+ * @brief Example server application using the BACnet Stack on a Raspberry Pi
+ * with a PiFace Digital I/O card.
  * @author Steve Karg <skarg@users.sourceforge.net>
  * @date January 2023
- *
- * SPDX-License-Identifier: MIT
- *
+ * @copyright SPDX-License-Identifier: MIT
  */
 #include <stddef.h>
 #include <stdint.h>
@@ -37,7 +36,6 @@
 #include "bacnet/basic/object/bi.h"
 #include "bacnet/basic/object/blo.h"
 #include "bacnet/basic/object/bo.h"
-#include "pifacedigital.h"
 
 /** @file server/main.c  Example server application using the BACnet Stack. */
 
@@ -59,6 +57,15 @@ static struct mstimer BACnet_Object_Timer;
 /* track the state of of the output */
 static bool PiFace_Output_State[PIFACE_OUTPUTS_MAX];
 
+#ifndef BUILD_PIPELINE
+#include "pifacedigital.h"
+#else
+#define pifacedigital_digital_write(a, b) printf("PiFace write[%u]=%d\n", a, b)
+#define pifacedigital_digital_read(a) printf("PiFace read[%u]\n", a)
+#define pifacedigital_open(a) printf("PiFace Open=%d\n", a)
+#define pifacedigital_close(a) printf("PiFace Close=%d\n", a)
+#endif
+
 /**
  * @brief output write value request
  * @param index - 0..N index of the output