Update ModuleTest build test to enable new warnings supported in the latest Atmel Toolchain release's included AVR-GCC version.

BuildTests/ModuleTest/makefile.test

@@ -46,6 +46,14 @@ CC_FLAGS += -Wmissing-field-initializers
 CC_FLAGS += -Wmissing-format-attribute
 CC_FLAGS += -Woverlength-strings
 CC_FLAGS += -Wswitch-default
+CC_FLAGS += -Wfloat-equal
+CC_FLAGS += -Waggregate-return
+CC_FLAGS += -Wmissing-include-dirs
+
+# Disable warnings not supported by the version of GCC used for UC3 targets (FIXME)
+ifneq ($(ARCH), UC3)
+  CC_FLAGS += -Wdouble-promotion
+endif
 
 # Only enable rendundant declaration warnings for AVR8 target (FIXME)
 ifeq ($(ARCH), AVR8)
@@ -54,13 +62,23 @@ endif
 
 # C compiler only flags
 C_FLAGS += -Wmissing-parameter-type
+C_FLAGS += -Wmissing-prototypes
 C_FLAGS += -Wnested-externs
+C_FLAGS += -Wbad-function-cast
+C_FLAGS += -Wstrict-prototypes
+C_FLAGS += -Wold-style-definition
+
+# Disable warnings not supported by the version of GCC used for UC3 targets (FIXME)
+ifneq ($(ARCH), UC3)
+  C_FLAGS += -Wunsuffixed-float-constants
+  C_FLAGS += -Wjump-misses-init
+endif
 
 # Potential additional warnings to enable in the future (FIXME)
-#CC_FLAGS += -Wc++-compat
+#C_FLAGS += -Wc++-compat
 #CC_FLAGS += -Wcast-qual
 #CC_FLAGS += -Wconversion
-#CC_FLAGS += -Wjump-misses-init
+#CC_FLAGS += -Wsign-conversion
 #CC_FLAGS += -pedantic
 
 # Include LUFA build script makefiles