Fix conflicting types for 'tfp_printf'

.gitmodules

@@ -16,3 +16,6 @@
 [submodule "lib/lufa"]
 	path = lib/lufa
 	url = https://github.com/qmk/lufa
+[submodule "lib/printf"]
+	path = lib/printf
+	url = https://github.com/mpaland/printf.git

Makefile

@@ -567,6 +567,7 @@ ifndef SKIP_GIT
 	if [ ! -e lib/chibios-contrib ]; then git submodule sync lib/chibios-contrib && git submodule update --depth 50 --init lib/chibios-contrib; fi
 	if [ ! -e lib/ugfx ]; then git submodule sync lib/ugfx && git submodule update --depth 50 --init lib/ugfx; fi
 	if [ ! -e lib/lufa ]; then git submodule sync lib/lufa && git submodule update --depth 50 --init lib/lufa; fi
+	if [ ! -e lib/printf ]; then git submodule sync lib/printf && git submodule update --depth 50 --init lib/printf; fi
 	git submodule status --recursive 2>/dev/null | \
 	while IFS= read -r x; do \
 		case "$$x" in \

tmk_core/common.mk

@@ -1,3 +1,5 @@
+PRINTF_PATH = $(LIB_PATH)/printf
+
 COMMON_DIR = common
 PLATFORM_COMMON_DIR = $(COMMON_DIR)/$(PLATFORM_KEY)
 
@@ -20,7 +22,12 @@ TMK_COMMON_SRC +=	$(COMMON_DIR)/host.c \
 ifeq ($(PLATFORM),AVR)
   TMK_COMMON_SRC += $(PLATFORM_COMMON_DIR)/xprintf.S
 else ifeq ($(PLATFORM),CHIBIOS)
-  TMK_COMMON_SRC += $(PLATFORM_COMMON_DIR)/printf.c
+  TMK_COMMON_SRC += $(PRINTF_PATH)/printf.c
+  TMK_COMMON_DEFS += -DPRINTF_DISABLE_SUPPORT_FLOAT
+  TMK_COMMON_DEFS += -DPRINTF_DISABLE_SUPPORT_EXPONENTIAL
+  TMK_COMMON_DEFS += -DPRINTF_DISABLE_SUPPORT_LONG_LONG
+  TMK_COMMON_DEFS += -DPRINTF_DISABLE_SUPPORT_PTRDIFF_T
+  VPATH += $(PRINTF_PATH)
 else ifeq ($(PLATFORM),ARM_ATSAM)
   TMK_COMMON_SRC += $(PLATFORM_COMMON_DIR)/printf.c
 endif