[wip:20220306] OpenGD77 for LLVM/Clang

diff -ru OpenGD77.orig/firmware/Makefile OpenGD77/firmware/Makefile
--- OpenGD77.orig/firmware/Makefile	2021-07-10 16:39:42.000000000 +0900
+++ OpenGD77/firmware/Makefile	2022-03-06 19:14:29.061289991 +0900
@@ -171,7 +171,7 @@
 ALL_SRC := $(SRC) $(OS_SRC) $(DEVICE_SRC) $(DRIVERS_SRC)
 CONFIGS := $(TARGET) -Wall  -fno-common -g3 -ffunction-sections \
 		-fdata-sections -ffreestanding -fno-builtin \
-		-fmerge-constants -fstack-usage
+#		-fmerge-constants -fstack-usage

 REDLIB := 0
 ifeq ($(REDLIB), 1)
@@ -200,7 +200,7 @@
 OZERO_OBJECTS := $(addprefix $(BUILD_DIR)/,  $(addsuffix .o, $(basename $(OZERO_SOURCES))))

 CFLAGS   := $(ALL_INC) -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb $(CONFIGS) \
-            $(DEFINES) $(EXCEPT) -c
+            $(DEFINES) $(EXCEPT) -c --target=arm-none-eabi -I/usr/arm-none-eabi/include

 AFLAGS   := -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb
 LFLAGS   := -nostdlib -Xlinker -Map="firmware.map" -Xlinker --gc-sections -Xlinker  \
@@ -211,7 +211,7 @@

 LINK_LIBS := $(LIBS)

-CC  := arm-none-eabi-gcc
+CC  := clang
 AS  := arm-none-eabi-as
 CP  := arm-none-eabi-objcopy
 SZ  := arm-none-eabi-size
diff -ru OpenGD77.orig/firmware/include/dmr_codec/codec.h OpenGD77/firmware/include/dmr_codec/codec.h
--- OpenGD77.orig/firmware/include/dmr_codec/codec.h	2021-07-10 16:39:42.000000000 +0900
+++ OpenGD77/firmware/include/dmr_codec/codec.h	2022-03-06 19:21:26.236296961 +0900
@@ -41,7 +41,7 @@
 #define AMBE_ENCODE_ECC 0x00054228;
 */

-#define AMBE_DECODE 0x0005543D;
+#define AMBE_DECODE 0x0005543C;
 #define AMBE_ENCODE 0x00054F94;
 #define AMBE_ENCODE_ECC 0x0005534C;

diff -ru OpenGD77.orig/firmware/source/semihost_hardfault.c OpenGD77/firmware/source/semihost_hardfault.c
--- OpenGD77.orig/firmware/source/semihost_hardfault.c	2021-07-10 16:39:42.000000000 +0900
+++ OpenGD77/firmware/source/semihost_hardfault.c	2022-03-06 19:37:39.115313214 +0900
@@ -102,7 +102,12 @@
     		    "STR R1,[ R0,#0 ] \n" // R0 is at location 0 on stack
     	// Return from hard fault handler to application
             "BX LR \n"
-        ".syntax divided\n") ;
+#if defined(__clang__)
+    	// LLVM/Clang: unified syntax only
+#else
+        ".syntax divided\n"
+#endif
+	) ;
 }

 #endif