8008474: Add -Wundef to warning flags.

Summary: Force use of undefined macros to be and error.
Reviewed-by: dholmes, mikael

make/bsd/makefiles/gcc.make

@@ -168,12 +168,12 @@ endif
 # conversions which might affect the values. To avoid that, we need to turn
 # it off explicitly. 
 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
-ACCEPTABLE_WARNINGS = -Wpointer-arith -Wsign-compare
+WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef
 else
-ACCEPTABLE_WARNINGS = -Wpointer-arith -Wconversion -Wsign-compare
+WARNING_FLAGS = -Wpointer-arith -Wconversion -Wsign-compare -Wundef
 endif
 
-CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(ACCEPTABLE_WARNINGS)
+CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
 # Special cases
 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@)) 
 # XXXDARWIN: for _dyld_bind_fully_image_containing_address

make/linux/makefiles/gcc.make

@@ -131,12 +131,12 @@ WARNINGS_ARE_ERRORS = -Werror
 # conversions which might affect the values. To avoid that, we need to turn
 # it off explicitly. 
 ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
-ACCEPTABLE_WARNINGS = -Wpointer-arith -Wsign-compare
+WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef
 else
-ACCEPTABLE_WARNINGS = -Wpointer-arith -Wconversion -Wsign-compare
+WARNING_FLAGS = -Wpointer-arith -Wconversion -Wsign-compare -Wundef
 endif
 
-CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(ACCEPTABLE_WARNINGS)
+CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
 # Special cases
 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@)) 
 

make/solaris/makefiles/gcc.make

@@ -118,8 +118,8 @@ endif
 # Compiler warnings are treated as errors 
 WARNINGS_ARE_ERRORS = -Werror 
 # Enable these warnings. See 'info gcc' about details on these options
-ADDITIONAL_WARNINGS = -Wpointer-arith -Wconversion -Wsign-compare 
-CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(ADDITIONAL_WARNINGS) 
+WARNING_FLAGS = -Wpointer-arith -Wconversion -Wsign-compare -Wundef
+CFLAGS_WARN/DEFAULT = $(WARNINGS_ARE_ERRORS) $(WARNING_FLAGS)
 # Special cases 
 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@))