Makefile: Include debug symbols in the .elf

Signed-off-by: Sergey Alirzaev <zl29ah@gmail.com>

Makefile

@@ -29,10 +29,10 @@ dirs-y = src
 cc-option=$(shell if test -z "`$(1) $(2) -S -o /dev/null -xc /dev/null 2>&1`" \
     ; then echo "$(2)"; else echo "$(3)"; fi ;)
 
-CFLAGS := -I$(OUT) -Isrc -I$(OUT)board-generic/ -std=gnu11 -O2 -MD -g \
+CFLAGS := -I$(OUT) -Isrc -I$(OUT)board-generic/ -std=gnu11 -O2 -MD \
     -Wall -Wold-style-definition $(call cc-option,$(CC),-Wtype-limits,) \
     -ffunction-sections -fdata-sections
-CFLAGS += -flto -fwhole-program -fno-use-linker-plugin
+CFLAGS += -flto -fwhole-program -fno-use-linker-plugin -ggdb3
 
 OBJS_klipper.elf = $(patsubst %.c, $(OUT)src/%.o,$(src-y))
 OBJS_klipper.elf += $(OUT)compile_time_request.o

src/pru/pru.lds

@@ -3,7 +3,9 @@ SECTIONS
 {
     /* binutils on the PRU doesn't support --gc-sections so manually
      * discard the .compile_time_request section */
+    /* and GDB extended debugging information */
     /DISCARD/ : {
         *( .compile_time_request )
+        *( .gnu.debug* )
     }
 }