arm: makefile improvements

arm/bootloader.ld

@@ -7,7 +7,7 @@ SECTIONS
 {
     .text :
     {
-        KEEP(vector_table.o(.vector_table))
+        KEEP(*(.vector_table))
 
         *(.text*)
         *(.rodata*)

arm/makefile

@@ -7,12 +7,13 @@ linker_script = bootloader.ld
 includes = 
 sources =
 
-CFLAGS = -march=armv6-m -g -ffunction-sections -fdata-sections -O2 -Werror -Wall
-CXXFLAGS = $(CFLAGS) -std=c++20 -fno-exceptions
+CFLAGS = -march=armv6-m -g -ffunction-sections -fdata-sections -Os -Werror -Wall -flto
+CXXFLAGS = $(CFLAGS) -std=c++20 -fno-exceptions -fcoroutines
+CPPFLAGS = -MD -MP
 LDFLAGS = -march=armv6-m \
 		  -g --specs=nano.specs --specs=nosys.specs \
-		  -Wl,--gc-sections -O2 \
-		  -Wl,--print-memory-usage
+		  -Wl,--gc-sections -Os \
+		  -Wl,--print-memory-usage -flto
 
 sources += hal/lib/common/xil_assert.c
 includes += -Ihal/lib/common
@@ -23,17 +24,18 @@ includes += -Ihal/uart
 bootloader_objects = uart.o bootloader.o vector_table.o $(sources:.c=.o)
 app_objects = app_init.o main.o
 
-CFLAGS += $(includes)
+CPPFLAGS += $(includes)
 
 all: bootloader.elf app.bin
 
 %.bin: %.elf
 	$(OBJCOPY) -O binary $< $@
 
-bootloader.elf: $(bootloader_objects)
-	$(LD) -Wl,-Tbootloader.ld $(LDFLAGS) -o $@ $^
+bootloader.elf: $(bootloader_objects) bootloader.ld
+	$(LD) -Wl,-Tbootloader.ld $(LDFLAGS) -o $@ $(bootloader_objects)
 
-app.elf: $(app_objects)
+app.elf: $(app_objects) app.ld
+	$(LD) -Wl,-Tapp.ld $(LDFLAGS) -o $@ $(app_objects)
 
 %.elf:
 	$(LD) -Wl,-Tapp.ld $(LDFLAGS) -o $@ $^