Improved build commands

Makefile

@@ -2,23 +2,27 @@ ifeq ($(BUILDROOT),)
 $(error BUILDROOT IS NOT SET!)
 endif
 
+TARGET := x86_64-elf
+KERNELMAKE := TARGET=${TARGET} $(MAKE) -C src/kernel
+
+DIST := $(BUILDROOT)/mittos.iso
 SYSROOT := $(BUILDROOT)/sysroot
 
-DIST := $(BUILDROOT)/dist/mittos.iso
-
-$(DIST):
-	setup-grub.sh
+$(DIST): $(SYSROOT)/kernel
+	$(BUILDROOT)/toolchain/setup-grub.sh
 	grub-mkrescue -o $@ $(SYSROOT)
 
-kernel:
+$(SYSROOT)/kernel: FORCE
 ifeq ($(shell make -sqC src/kernel || echo 1), 1)
-	$(MAKE) -C src/kernel install
+	$(KERNELMAKE) install
 endif
 
-install: $(DIST)
+.PHONY: FORCE
 
 clean:
 	rm -rf $(DIST)
-	$(MAKE) -C src/kernel clean
+	$(KERNELMAKE) clean
 
-.PHONY: install
+distclean:
+	$(MAKE) clean
+	rm -rf $(SYSROOT)