debug symbols are expected in .debug file

Makefile

@@ -29,11 +29,11 @@ deps=$(csrc:%.c=%.d) $(gasmsrc:%.S=%.d)
 docsrc=$(wildcard docs/*.md)
 docobj=$(docsrc:%.md=%.html)
 
-kernel kernel.sym &: $(asmobj) $(gasmobj) $(cobj) linker.ld
+kernel kernel.debug &: $(asmobj) $(gasmobj) $(cobj) linker.ld
 	$(LD) $(LDFLAGS) $(asmobj) $(gasmobj) $(cobj) -o kernel -T linker.ld $(LIBGCC) -Map kernel.map
-	objcopy --only-keep-debug kernel kernel.sym
+	objcopy --only-keep-debug kernel kernel.debug
 	objcopy --strip-debug  kernel
-	objcopy --add-gnu-debuglink=kernel.sym kernel
+	objcopy --add-gnu-debuglink=kernel.debug kernel
 
 fd.iso: kernel
 	mkdir -p isodir/boot/grub
@@ -90,7 +90,7 @@ run:kernel disk.img          ## Run the OS on qemu
 
 debug: CFLAGS += $(DEBUG_FLAGS) ## Run the OS on qemu and attach a debugger to it (may need a clean befor to have the debug symbols)
 debug: CXXFLAGS += $(DEBUG_FLAGS)
-debug:kernel kernel.sym disk.img
+debug:kernel kernel.debug disk.img
 	gdb -q -x debug.gdb
 
 debug_test: CFLAGS += $(DEBUG_FLAGS) -DRUN_TEST
@@ -100,7 +100,7 @@ screenshot:
 	shutter --window=qemu -o screenshot_1.png -e && zopflipng screenshot_1.png screenshot_1.png
 
 clean:
-	$(RM) kernel $(asmobj) $(gasmobj) $(cobj) $(deps) $(cinc) fd.iso kernel.sym kernel.map $(docobj)
+	$(RM) kernel $(asmobj) $(gasmobj) $(cobj) $(deps) $(cinc) fd.iso kernel.debug kernel.map $(docobj)
 	$(RM) -r isodir
 
 .PHONY:

debug.gdb

@@ -1,4 +1,9 @@
 add-symbol-file userspace/user
+# Thx to add-gnu-debuglink gdb should know that symbols are in kernel.debug.
+# And by default, it should be looking at executable.debug
+# But we still have to give him the executable he is suppose to debug (See https://sourceware.org/gdb/current/onlinedocs/gdb.html/Separate-Debug-Files.html)
+#add-symbol-file kernel.debug
+file kernel
 source custom_gdb_extension.py
 #For ASM sources
 directory arch/x86/:core