kernel entry assembly code to avoid compiler anomalies.

Makefile

@@ -9,12 +9,13 @@ LDFLAGS=-melf_i386 -Ttext 0x1000 --oformat binary
 basicos:
 	mkdir -p $(BIN)
 	$(ASM) boot_sect.asm $(AFLAGS) -o boot_sect.bin
+	$(ASM) kernel_entry.asm -f elf -o kernel_entry.o
 	$(CC) $(CFLAGS) -c kernel.c -o kernel.o
-	$(LD) $(LDFLAGS) -o kernel.bin kernel.o
+	$(LD) $(LDFLAGS) -o kernel.bin kernel_entry.o kernel.o
 	cat boot_sect.bin kernel.bin > $(BIN)/os-image
 
 
 .PHONY: clean
 
 clean:
-	rm *.bin *.o
+	rm -f *.bin *.o

kernel_entry.asm

@@ -0,0 +1,4 @@
+[bits 32]
+[extern main]       ; reference an external label
+	call main       ; call the main function of our kernel
+	jmp $           ; hang