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-rw-r--r--demos/STM32/CMSIS-STM32F407-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/HAL-STM32F407-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/NIL-STM32F051-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/NIL-STM32F100-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/NIL-STM32F303-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/NIL-STM32F373-STM32373C_EVAL/Makefile4
-rw-r--r--demos/STM32/NIL-STM32L152-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32F030R8-NUCLEO/Makefile4
-rw-r--r--demos/STM32/RT-STM32F051-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32F072-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32F100-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32F103-MAPLEMINI/Makefile4
-rw-r--r--demos/STM32/RT-STM32F103-OLIMEX_STM32_P103/Makefile4
-rw-r--r--demos/STM32/RT-STM32F103RB-NUCLEO/Makefile4
-rw-r--r--demos/STM32/RT-STM32F103_INEMO_DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32F302R8-NUCLEO/Makefile4
-rw-r--r--demos/STM32/RT-STM32F303-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32F334R8-NUCLEO/Makefile4
-rw-r--r--demos/STM32/RT-STM32F373-STM32373C_EVAL/Makefile4
-rw-r--r--demos/STM32/RT-STM32F401C-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32F401RE-NUCLEO/Makefile4
-rw-r--r--demos/STM32/RT-STM32F407-DISCOVERY-G++/Makefile4
-rw-r--r--demos/STM32/RT-STM32F407-DISCOVERY-MEMS/Makefile4
-rw-r--r--demos/STM32/RT-STM32F407-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32F407-OLIMEX_E407-LWIP-FATFS-USB/Makefile4
-rw-r--r--demos/STM32/RT-STM32F411RE-NUCLEO/Makefile4
-rw-r--r--demos/STM32/RT-STM32F429-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32L152-DISCOVERY/Makefile4
-rw-r--r--demos/STM32/RT-STM32L152RE-NUCLEO/Makefile4
29 files changed, 58 insertions, 58 deletions
diff --git a/demos/STM32/CMSIS-STM32F407-DISCOVERY/Makefile b/demos/STM32/CMSIS-STM32F407-DISCOVERY/Makefile
index 92224a401..91b9054e0 100644
--- a/demos/STM32/CMSIS-STM32F407-DISCOVERY/Makefile
+++ b/demos/STM32/CMSIS-STM32F407-DISCOVERY/Makefile
@@ -182,10 +182,10 @@ 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/STM32/HAL-STM32F407-DISCOVERY/Makefile b/demos/STM32/HAL-STM32F407-DISCOVERY/Makefile
index a3a1d6e70..6c89a1637 100644
--- a/demos/STM32/HAL-STM32F407-DISCOVERY/Makefile
+++ b/demos/STM32/HAL-STM32F407-DISCOVERY/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/STM32/NIL-STM32F051-DISCOVERY/Makefile b/demos/STM32/NIL-STM32F051-DISCOVERY/Makefile
index 9b7a04d3e..02d224c7f 100644
--- a/demos/STM32/NIL-STM32F051-DISCOVERY/Makefile
+++ b/demos/STM32/NIL-STM32F051-DISCOVERY/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/STM32/NIL-STM32F100-DISCOVERY/Makefile b/demos/STM32/NIL-STM32F100-DISCOVERY/Makefile
index f59571c08..ab54ebde7 100644
--- a/demos/STM32/NIL-STM32F100-DISCOVERY/Makefile
+++ b/demos/STM32/NIL-STM32F100-DISCOVERY/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/STM32/NIL-STM32F303-DISCOVERY/Makefile b/demos/STM32/NIL-STM32F303-DISCOVERY/Makefile
index b067d01d4..7eba78d07 100644
--- a/demos/STM32/NIL-STM32F303-DISCOVERY/Makefile
+++ b/demos/STM32/NIL-STM32F303-DISCOVERY/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/STM32/NIL-STM32F373-STM32373C_EVAL/Makefile b/demos/STM32/NIL-STM32F373-STM32373C_EVAL/Makefile
index e3d61a772..a8db746b4 100644
--- a/demos/STM32/NIL-STM32F373-STM32373C_EVAL/Makefile
+++ b/demos/STM32/NIL-STM32F373-STM32373C_EVAL/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/STM32/NIL-STM32L152-DISCOVERY/Makefile b/demos/STM32/NIL-STM32L152-DISCOVERY/Makefile
index cac6281a1..ecf8b1864 100644
--- a/demos/STM32/NIL-STM32L152-DISCOVERY/Makefile
+++ b/demos/STM32/NIL-STM32L152-DISCOVERY/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/STM32/RT-STM32F030R8-NUCLEO/Makefile b/demos/STM32/RT-STM32F030R8-NUCLEO/Makefile
index 2ea94f529..7b26e8d86 100644
--- a/demos/STM32/RT-STM32F030R8-NUCLEO/Makefile
+++ b/demos/STM32/RT-STM32F030R8-NUCLEO/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/STM32/RT-STM32F051-DISCOVERY/Makefile b/demos/STM32/RT-STM32F051-DISCOVERY/Makefile
index 0d71f6833..b19b5b3ed 100644
--- a/demos/STM32/RT-STM32F051-DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32F051-DISCOVERY/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/STM32/RT-STM32F072-DISCOVERY/Makefile b/demos/STM32/RT-STM32F072-DISCOVERY/Makefile
index 3735e9b23..3d398a8ab 100644
--- a/demos/STM32/RT-STM32F072-DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32F072-DISCOVERY/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/STM32/RT-STM32F100-DISCOVERY/Makefile b/demos/STM32/RT-STM32F100-DISCOVERY/Makefile
index dc4dd1651..d302ec887 100644
--- a/demos/STM32/RT-STM32F100-DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32F100-DISCOVERY/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/STM32/RT-STM32F103-MAPLEMINI/Makefile b/demos/STM32/RT-STM32F103-MAPLEMINI/Makefile
index 14e3bca12..e189b6d3b 100644
--- a/demos/STM32/RT-STM32F103-MAPLEMINI/Makefile
+++ b/demos/STM32/RT-STM32F103-MAPLEMINI/Makefile
@@ -190,10 +190,10 @@ 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/STM32/RT-STM32F103-OLIMEX_STM32_P103/Makefile b/demos/STM32/RT-STM32F103-OLIMEX_STM32_P103/Makefile
index db90a1947..5c6b139e0 100644
--- a/demos/STM32/RT-STM32F103-OLIMEX_STM32_P103/Makefile
+++ b/demos/STM32/RT-STM32F103-OLIMEX_STM32_P103/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/STM32/RT-STM32F103RB-NUCLEO/Makefile b/demos/STM32/RT-STM32F103RB-NUCLEO/Makefile
index c0e6c67b6..1a2f876e7 100644
--- a/demos/STM32/RT-STM32F103RB-NUCLEO/Makefile
+++ b/demos/STM32/RT-STM32F103RB-NUCLEO/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/STM32/RT-STM32F103_INEMO_DISCOVERY/Makefile b/demos/STM32/RT-STM32F103_INEMO_DISCOVERY/Makefile
index 63c8599c4..8c72eceef 100644
--- a/demos/STM32/RT-STM32F103_INEMO_DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32F103_INEMO_DISCOVERY/Makefile
@@ -183,10 +183,10 @@ 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/STM32/RT-STM32F302R8-NUCLEO/Makefile b/demos/STM32/RT-STM32F302R8-NUCLEO/Makefile
index dcdb27880..fc95cd9d4 100644
--- a/demos/STM32/RT-STM32F302R8-NUCLEO/Makefile
+++ b/demos/STM32/RT-STM32F302R8-NUCLEO/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/STM32/RT-STM32F303-DISCOVERY/Makefile b/demos/STM32/RT-STM32F303-DISCOVERY/Makefile
index a3d40c6cf..0c32ac9c8 100644
--- a/demos/STM32/RT-STM32F303-DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32F303-DISCOVERY/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/STM32/RT-STM32F334R8-NUCLEO/Makefile b/demos/STM32/RT-STM32F334R8-NUCLEO/Makefile
index 0ca45922f..228d143a3 100644
--- a/demos/STM32/RT-STM32F334R8-NUCLEO/Makefile
+++ b/demos/STM32/RT-STM32F334R8-NUCLEO/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/STM32/RT-STM32F373-STM32373C_EVAL/Makefile b/demos/STM32/RT-STM32F373-STM32373C_EVAL/Makefile
index 3001ef6ab..48ce621e6 100644
--- a/demos/STM32/RT-STM32F373-STM32373C_EVAL/Makefile
+++ b/demos/STM32/RT-STM32F373-STM32373C_EVAL/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/STM32/RT-STM32F401C-DISCOVERY/Makefile b/demos/STM32/RT-STM32F401C-DISCOVERY/Makefile
index fca643b76..15bb77935 100644
--- a/demos/STM32/RT-STM32F401C-DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32F401C-DISCOVERY/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/STM32/RT-STM32F401RE-NUCLEO/Makefile b/demos/STM32/RT-STM32F401RE-NUCLEO/Makefile
index 8f55807b3..aa4e0fe21 100644
--- a/demos/STM32/RT-STM32F401RE-NUCLEO/Makefile
+++ b/demos/STM32/RT-STM32F401RE-NUCLEO/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/STM32/RT-STM32F407-DISCOVERY-G++/Makefile b/demos/STM32/RT-STM32F407-DISCOVERY-G++/Makefile
index bf65677a4..648a7c66e 100644
--- a/demos/STM32/RT-STM32F407-DISCOVERY-G++/Makefile
+++ b/demos/STM32/RT-STM32F407-DISCOVERY-G++/Makefile
@@ -181,10 +181,10 @@ 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/STM32/RT-STM32F407-DISCOVERY-MEMS/Makefile b/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/Makefile
index 4adaa6e65..c2344d797 100644
--- a/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/Makefile
+++ b/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/Makefile
@@ -185,10 +185,10 @@ 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/STM32/RT-STM32F407-DISCOVERY/Makefile b/demos/STM32/RT-STM32F407-DISCOVERY/Makefile
index 225812372..672d9aded 100644
--- a/demos/STM32/RT-STM32F407-DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32F407-DISCOVERY/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/STM32/RT-STM32F407-OLIMEX_E407-LWIP-FATFS-USB/Makefile b/demos/STM32/RT-STM32F407-OLIMEX_E407-LWIP-FATFS-USB/Makefile
index ce41ce8fc..eaf9ee7df 100644
--- a/demos/STM32/RT-STM32F407-OLIMEX_E407-LWIP-FATFS-USB/Makefile
+++ b/demos/STM32/RT-STM32F407-OLIMEX_E407-LWIP-FATFS-USB/Makefile
@@ -189,10 +189,10 @@ 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/STM32/RT-STM32F411RE-NUCLEO/Makefile b/demos/STM32/RT-STM32F411RE-NUCLEO/Makefile
index 04022acf7..d0e1aa043 100644
--- a/demos/STM32/RT-STM32F411RE-NUCLEO/Makefile
+++ b/demos/STM32/RT-STM32F411RE-NUCLEO/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/STM32/RT-STM32F429-DISCOVERY/Makefile b/demos/STM32/RT-STM32F429-DISCOVERY/Makefile
index daffd3d85..f99504f74 100644
--- a/demos/STM32/RT-STM32F429-DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32F429-DISCOVERY/Makefile
@@ -183,10 +183,10 @@ 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/STM32/RT-STM32L152-DISCOVERY/Makefile b/demos/STM32/RT-STM32L152-DISCOVERY/Makefile
index 8bcd4b933..579383bc7 100644
--- a/demos/STM32/RT-STM32L152-DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32L152-DISCOVERY/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/STM32/RT-STM32L152RE-NUCLEO/Makefile b/demos/STM32/RT-STM32L152RE-NUCLEO/Makefile
index d0fc04bb8..4bfc3cc7a 100644
--- a/demos/STM32/RT-STM32L152RE-NUCLEO/Makefile
+++ b/demos/STM32/RT-STM32L152RE-NUCLEO/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