[Core] Update mpaland/printf to eyalroz/printf fork (#16163)

mpaland printf implementation was abandoned in ~2019 and the fork by
eyalroz is now regarded to be the goto replacement of it. So this commit
incoporates the changes needed to use this fork in QMK.

Note that pointer ptrdiff_t is always supported since commit
51c90f93a97fdaef895783ecbe24569be0db7cb8

builddefs/build_test.mk

@@ -38,11 +38,11 @@ CREATE_MAP := no
 VPATH += \
 	$(LIB_PATH)/googletest \
 	$(LIB_PATH)/googlemock \
-	$(LIB_PATH)/printf
+	$(COMMON_VPATH) \
+	$(TEST_PATH)
 
 all: elf
 
-VPATH += $(TEST_PATH) $(COMMON_VPATH)
 PLATFORM:=TEST
 PLATFORM_KEY:=test
 BOOTLOADER_TYPE:=none
@@ -64,6 +64,7 @@ include $(QUANTUM_PATH)/debounce/tests/rules.mk
 include $(QUANTUM_PATH)/encoder/tests/rules.mk
 include $(QUANTUM_PATH)/sequencer/tests/rules.mk
 include $(QUANTUM_PATH)/wear_leveling/tests/rules.mk
+include $(QUANTUM_PATH)/logging/print.mk
 include $(PLATFORM_PATH)/test/rules.mk
 ifneq ($(filter $(FULL_TESTS),$(TEST)),)
 include $(BUILDDEFS_PATH)/build_full_test.mk
@@ -71,7 +72,6 @@ endif
 
 $(TEST)_SRC += \
 	tests/test_common/main.c \
-	$(LIB_PATH)/printf/printf.c \
 	$(QUANTUM_PATH)/logging/print.c
 
 $(TEST_OBJ)/$(TEST)_SRC := $($(TEST)_SRC)

lib/printf

@@ -1 +1 @@
-Subproject commit d3b984684bb8a8bdc48cc7a1abecb93ce59bbe3e
+Subproject commit c2e3b4e10d281e7f0f694d3ecbd9f320977288cc

platforms/arm_atsam/platform.mk

@@ -24,6 +24,7 @@ COMPILEFLAGS += -fno-strict-aliasing
 COMPILEFLAGS += -mfloat-abi=hard
 COMPILEFLAGS += -mfpu=fpv4-sp-d16
 COMPILEFLAGS += -mthumb
+COMPILEFLAGS += -fno-builtin-printf
 
 #ALLOW_WARNINGS = yes
 

platforms/avr/platform.mk

@@ -24,6 +24,7 @@ COMPILEFLAGS += -fdata-sections
 COMPILEFLAGS += -fpack-struct
 COMPILEFLAGS += -fshort-enums
 COMPILEFLAGS += -mcall-prologues
+COMPILEFLAGS += -fno-builtin-printf
 
 # Linker relaxation is only possible if
 # link time optimizations are not enabled.

platforms/chibios/platform.mk

@@ -349,7 +349,8 @@ SHARED_CFLAGS = -fomit-frame-pointer \
                 -ffunction-sections \
                 -fdata-sections \
                 -fno-common \
-                -fshort-wchar
+                -fshort-wchar \
+                -fno-builtin-printf
 
 LDSCRIPT_PATH := $(shell dirname "$(LDSCRIPT)")
 

quantum/logging/print.c

@@ -28,6 +28,6 @@ void print_set_sendchar(sendchar_func_t send) {
     func = send;
 }
 
-void _putchar(char character) {
+void putchar_(char character) {
     func(character);
 }

quantum/logging/print.h

@@ -32,6 +32,22 @@
 
 void print_set_sendchar(sendchar_func_t func);
 
+/**
+ * @brief This macro suppress format warnings for the function that is passed
+ * in. The main use-case is that `b` format specifier for printing binary
+ * numbers is not in the official C standard. Inclusion is planned for the
+ * upcoming C2X C standard, but until then GCC will always output a warning for
+ * a unknown format specifier.
+ */
+#define IGNORE_FORMAT_WARNING(func)                                \
+    do {                                                           \
+        _Pragma("GCC diagnostic push");                            \
+        _Pragma("GCC diagnostic ignored \"-Wformat\"");            \
+        _Pragma("GCC diagnostic ignored \"-Wformat-extra-args\""); \
+        func;                                                      \
+        _Pragma("GCC diagnostic pop");                             \
+    } while (0)
+
 #ifndef NO_PRINT
 #    if __has_include_next("_print.h")
 #        include_next "_print.h" /* Include the platforms print.h */
@@ -78,25 +94,25 @@ void print_set_sendchar(sendchar_func_t func);
 #define print_hex16(i) xprintf("%04X", i)
 #define print_hex32(i) xprintf("%08lX", i)
 /* binary */
-#define print_bin4(i) xprintf("%04b", i)
-#define print_bin8(i) xprintf("%08b", i)
-#define print_bin16(i) xprintf("%016b", i)
-#define print_bin32(i) xprintf("%032lb", i)
-#define print_bin_reverse8(i) xprintf("%08b", bitrev(i))
-#define print_bin_reverse16(i) xprintf("%016b", bitrev16(i))
-#define print_bin_reverse32(i) xprintf("%032lb", bitrev32(i))
+#define print_bin4(i) IGNORE_FORMAT_WARNING(xprintf("%04b", i))
+#define print_bin8(i) IGNORE_FORMAT_WARNING(xprintf("%08b", i))
+#define print_bin16(i) IGNORE_FORMAT_WARNING(xprintf("%016b", i))
+#define print_bin32(i) IGNORE_FORMAT_WARNING(xprintf("%032lb", i))
+#define print_bin_reverse8(i) IGNORE_FORMAT_WARNING(xprintf("%08b", bitrev(i)))
+#define print_bin_reverse16(i) IGNORE_FORMAT_WARNING(xprintf("%016b", bitrev16(i)))
+#define print_bin_reverse32(i) IGNORE_FORMAT_WARNINGxprintf("%032lb", bitrev32(i)))
 /* print value utility */
 #define print_val_dec(v) xprintf(#v ": %u\n", v)
 #define print_val_decs(v) xprintf(#v ": %d\n", v)
 #define print_val_hex8(v) xprintf(#v ": %X\n", v)
 #define print_val_hex16(v) xprintf(#v ": %02X\n", v)
 #define print_val_hex32(v) xprintf(#v ": %04lX\n", v)
-#define print_val_bin8(v) xprintf(#v ": %08b\n", v)
-#define print_val_bin16(v) xprintf(#v ": %016b\n", v)
-#define print_val_bin32(v) xprintf(#v ": %032lb\n", v)
-#define print_val_bin_reverse8(v) xprintf(#v ": %08b\n", bitrev(v))
-#define print_val_bin_reverse16(v) xprintf(#v ": %016b\n", bitrev16(v))
-#define print_val_bin_reverse32(v) xprintf(#v ": %032lb\n", bitrev32(v))
+#define print_val_bin8(v) IGNORE_FORMAT_WARNING(xprintf(#v ": %08b\n", v))
+#define print_val_bin16(v) IGNORE_FORMAT_WARNING(xprintf(#v ": %016b\n", v))
+#define print_val_bin32(v) IGNORE_FORMAT_WARNING(xprintf(#v ": %032lb\n", v))
+#define print_val_bin_reverse8(v) IGNORE_FORMAT_WARNING(xprintf(#v ": %08b\n", bitrev(v)))
+#define print_val_bin_reverse16(v) IGNORE_FORMAT_WARNING(xprintf(#v ": %016b\n", bitrev16(v)))
+#define print_val_bin_reverse32(v) IGNORE_FORMAT_WARNING(xprintf(#v ": %032lb\n", bitrev32(v)))
 
 // User print disables the normal print messages in the body of QMK/TMK code and
 // is meant as a lightweight alternative to NOPRINT. Use it when you only want to do
@@ -114,22 +130,22 @@ void print_set_sendchar(sendchar_func_t func);
 #define uprint_hex16(i) uprintf("%04X", i)
 #define uprint_hex32(i) uprintf("%08lX", i)
 /* binary */
-#define uprint_bin4(i) uprintf("%04b", i)
-#define uprint_bin8(i) uprintf("%08b", i)
-#define uprint_bin16(i) uprintf("%016b", i)
-#define uprint_bin32(i) uprintf("%032lb", i)
-#define uprint_bin_reverse8(i) uprintf("%08b", bitrev(i))
-#define uprint_bin_reverse16(i) uprintf("%016b", bitrev16(i))
-#define uprint_bin_reverse32(i) uprintf("%032lb", bitrev32(i))
+#define uprint_bin4(i) IGNORE_FORMAT_WARNING(uprintf("%04b", i))
+#define uprint_bin8(i) IGNORE_FORMAT_WARNING(uprintf("%08b", i))
+#define uprint_bin16(i) IGNORE_FORMAT_WARNING(uprintf("%016b", i))
+#define uprint_bin32(i) IGNORE_FORMAT_WARNING(uprintf("%032lb", i))
+#define uprint_bin_reverse8(i) IGNORE_FORMAT_WARNING(uprintf("%08b", bitrev(i)))
+#define uprint_bin_reverse16(i) IGNORE_FORMAT_WARNING(uprintf("%016b", bitrev16(i)))
+#define uprint_bin_reverse32(i) IGNORE_FORMAT_WARNING(uprintf("%032lb", bitrev32(i)))
 /* print value utility */
 #define uprint_val_dec(v) uprintf(#v ": %u\n", v)
 #define uprint_val_decs(v) uprintf(#v ": %d\n", v)
 #define uprint_val_hex8(v) uprintf(#v ": %X\n", v)
 #define uprint_val_hex16(v) uprintf(#v ": %02X\n", v)
 #define uprint_val_hex32(v) uprintf(#v ": %04lX\n", v)
-#define uprint_val_bin8(v) uprintf(#v ": %08b\n", v)
-#define uprint_val_bin16(v) uprintf(#v ": %016b\n", v)
-#define uprint_val_bin32(v) uprintf(#v ": %032lb\n", v)
-#define uprint_val_bin_reverse8(v) uprintf(#v ": %08b\n", bitrev(v))
-#define uprint_val_bin_reverse16(v) uprintf(#v ": %016b\n", bitrev16(v))
-#define uprint_val_bin_reverse32(v) uprintf(#v ": %032lb\n", bitrev32(v))
+#define uprint_val_bin8(v) IGNORE_FORMAT_WARNING(uprintf(#v ": %08b\n", v))
+#define uprint_val_bin16(v) IGNORE_FORMAT_WARNING(uprintf(#v ": %016b\n", v))
+#define uprint_val_bin32(v) IGNORE_FORMAT_WARNING(uprintf(#v ": %032lb\n", v))
+#define uprint_val_bin_reverse8(v) IGNORE_FORMAT_WARNING(uprintf(#v ": %08b\n", bitrev(v)))
+#define uprint_val_bin_reverse16(v) IGNORE_FORMAT_WARNING(uprintf(#v ": %016b\n", bitrev16(v)))
+#define uprint_val_bin_reverse32(v) IGNORE_FORMAT_WARNING(uprintf(#v ": %032lb\n", bitrev32(v)))

quantum/logging/print.mk

@@ -1,9 +1,12 @@
-PRINTF_PATH = $(LIB_PATH)/printf
+PRINTF_PATH = $(LIB_PATH)/printf/src
 
-VPATH += $(PRINTF_PATH)
-SRC += $(PRINTF_PATH)/printf.c
+VPATH += $(PRINTF_PATH) $(PRINTF_PATH)/printf
+SRC += printf.c
 QUANTUM_SRC +=$(QUANTUM_DIR)/logging/print.c
-OPT_DEFS += -DPRINTF_DISABLE_SUPPORT_FLOAT
-OPT_DEFS += -DPRINTF_DISABLE_SUPPORT_EXPONENTIAL
-OPT_DEFS += -DPRINTF_DISABLE_SUPPORT_LONG_LONG
-OPT_DEFS += -DPRINTF_DISABLE_SUPPORT_PTRDIFF_T
+
+OPT_DEFS += -DPRINTF_SUPPORT_DECIMAL_SPECIFIERS=0
+OPT_DEFS += -DPRINTF_SUPPORT_EXPONENTIAL_SPECIFIERS=0
+OPT_DEFS += -DPRINTF_SUPPORT_LONG_LONG=0
+OPT_DEFS += -DPRINTF_SUPPORT_WRITEBACK_SPECIFIER=0
+OPT_DEFS += -DSUPPORT_MSVC_STYLE_INTEGER_SPECIFIERS=0
+OPT_DEFS += -DPRINTF_ALIAS_STANDARD_FUNCTION_NAMES=1