7 files changed, 18 insertions, 11 deletions
diff --git a/demos/various/NIL-ARMCM0-GENERIC/Makefile b/demos/various/NIL-ARMCM0-GENERIC/Makefile
index 555fcb89f..de47bb7c3 100644
--- a/demos/various/NIL-ARMCM0-GENERIC/Makefile
+++ b/demos/various/NIL-ARMCM0-GENERIC/Makefile
@@ -175,10 +175,10 @@ AOPT =
 TOPT = -mthumb -DTHUMB
 
 # Define C warning options here
-CWARN = -Wall -Wextra -Wstrict-prototypes
+CWARN = -Wall -Wextra -Wundef -Wstrict-prototypes
 
 # Define C++ warning options here
-CPPWARN = -Wall -Wextra
+CPPWARN = -Wall -Wextra -Wundef
 
 #
 # Compiler settings
diff --git a/demos/various/NIL-ARMCM4-GENERIC/Makefile b/demos/various/NIL-ARMCM4-GENERIC/Makefile
index 92b7f18fe..1b4ebb822 100644
--- a/demos/various/NIL-ARMCM4-GENERIC/Makefile
+++ b/demos/various/NIL-ARMCM4-GENERIC/Makefile
@@ -180,10 +180,10 @@ AOPT =
 TOPT = -mthumb -DTHUMB
 
 # Define C warning options here
-CWARN = -Wall -Wextra -Wstrict-prototypes
+CWARN = -Wall -Wextra -Wundef -Wstrict-prototypes
 
 # Define C++ warning options here
-CPPWARN = -Wall -Wextra
+CPPWARN = -Wall -Wextra -Wundef
 
 #
 # Compiler settings
diff --git a/demos/various/RT-ARM7-GENERIC/Makefile b/demos/various/RT-ARM7-GENERIC/Makefile
index b48faf20f..bd26b728e 100644
--- a/demos/various/RT-ARM7-GENERIC/Makefile
+++ b/demos/various/RT-ARM7-GENERIC/Makefile
@@ -204,10 +204,10 @@ AOPT =
 TOPT = -mthumb -DTHUMB
 
 # Define C warning options here
-CWARN = -Wall -Wextra -Wstrict-prototypes
+CWARN = -Wall -Wextra -Wundef -Wstrict-prototypes
 
 # Define C++ warning options here
-CPPWARN = -Wall -Wextra
+CPPWARN = -Wall -Wextra -Wundef
 
 #
 # Compiler settings
diff --git a/demos/various/RT-ARMCM0-GENERIC/Makefile b/demos/various/RT-ARMCM0-GENERIC/Makefile
index 7dfea4806..a495b31b1 100644
--- a/demos/various/RT-ARMCM0-GENERIC/Makefile
+++ b/demos/various/RT-ARMCM0-GENERIC/Makefile
@@ -175,10 +175,10 @@ AOPT =
 TOPT = -mthumb -DTHUMB
 
 # Define C warning options here
-CWARN = -Wall -Wextra -Wstrict-prototypes
+CWARN = -Wall -Wextra -Wundef -Wstrict-prototypes
 
 # Define C++ warning options here
-CPPWARN = -Wall -Wextra
+CPPWARN = -Wall -Wextra -Wundef
 
 #
 # Compiler settings
diff --git a/demos/various/RT-ARMCM4-GENERIC/Makefile b/demos/various/RT-ARMCM4-GENERIC/Makefile
index a0a243c88..f9dc6580a 100644
--- a/demos/various/RT-ARMCM4-GENERIC/Makefile
+++ b/demos/various/RT-ARMCM4-GENERIC/Makefile
@@ -180,10 +180,10 @@ AOPT =
 TOPT = -mthumb -DTHUMB
 
 # Define C warning options here
-CWARN = -Wall -Wextra -Wstrict-prototypes
+CWARN = -Wall -Wextra -Wundef -Wstrict-prototypes
 
 # Define C++ warning options here
-CPPWARN = -Wall -Wextra
+CPPWARN = -Wall -Wextra -Wundef
 
 #
 # Compiler settings
diff --git a/demos/various/RT-Win32-Simulator/Makefile b/demos/various/RT-Win32-Simulator/Makefile
index ca25fd0d9..0164f138d 100644
--- a/demos/various/RT-Win32-Simulator/Makefile
+++ b/demos/various/RT-Win32-Simulator/Makefile
@@ -108,7 +108,7 @@ LIBS    = $(DLIBS) $(ULIBS)
 
 LDFLAGS = -Wl,-Map=$(PROJECT).map,--cref,--no-warn-mismatch $(LIBDIR)
 ASFLAGS = -Wa,-amhls=$(<:.s=.lst) $(ADEFS)
-CPFLAGS = -Wall -Wextra -Wstrict-prototypes -fverbose-asm -Wa,-alms=$(<:.c=.lst) $(DEFS)
+CPFLAGS = -Wall -Wextra -Wundef -Wstrict-prototypes -fverbose-asm -Wa,-alms=$(<:.c=.lst) $(DEFS)
 
 # Generate dependency information
 CPFLAGS += -MD -MP -MF .dep/$(@F).d
diff --git a/demos/various/RT-Win32-Simulator/halconf.h b/demos/various/RT-Win32-Simulator/halconf.h
index 5b55d8fcf..73766ec0d 100644
--- a/demos/various/RT-Win32-Simulator/halconf.h
+++ b/demos/various/RT-Win32-Simulator/halconf.h
@@ -87,6 +87,13 @@
 #endif
 
 /**
+ * @brief   Enables the I2S subsystem.
+ */
+#if !defined(HAL_USE_I2S) || defined(__DOXYGEN__)
+#define HAL_USE_I2S                 FALSE
+#endif
+
+/**
  * @brief   Enables the ICU subsystem.
  */
 #if !defined(HAL_USE_ICU) || defined(__DOXYGEN__)