# This is part of a GNU Makefile, included by the Makefiles in
# each of the subdirectories.  
#
# This file includes all of the baseline code provided by Nachos.
# Whenever you add a .h or .cc file, put it in the appropriate 
# _H,_C, or _O list.
#
# The dependency graph between assignments is:
#   1. THREADS before everything else
#   2. USERPROG must come before VM
#   3. USERPROG can come before or after FILESYS, but if USERPROG comes 
#	before (as in this distribution), then it must define FILESYS_STUB
#
#   Other than that, you have complete flexibility.
#

# You might want to play with the CFLAGS, but if you use -O it may
# break the thread system.  You might want to use -fno-inline if
# you need to call some inline functions from the debugger.

# Copyright (c) 1992 The Regents of the University of California.
# All rights reserved.  See copyright.h for copyright notice and limitation 
# of liability and disclaimer of warranty provisions.

###########################################################################
# RN: Sets of objects file to be linked for each nachos flavor. This
# is the only section you may need to modify when adding files in nachos.
#
THREAD_O	:=	main.o list.o scheduler.o synch.o synchlist.o \
			system.o thread.o utility.o threadtest.o interrupt.o \
			stats.o sysdep.o timer.o

USERPROG_O	:=	addrspace.o bitmap.o exception.o progtest.o console.o \
				consoledriver.o machine.o mipssim.o translate.o userthread.o

VM_O		:=

FILESYS_O	:=	directory.o filehdr.o filesys.o fstest.o openfile.o \
			synchdisk.o disk.o

NETWORK_O	:=	nettest.o post.o network.o
#
###########################################################################

S_OFILES	:=	switch.o

CFLAGS = -g -Wall -Wextra -Wshadow $(INCPATH) $(DEFINES) $(HOST) -DCHANGED 
LDFLAGS = -g
ASFLAGS = -g

# These definitions may change as the software is updated.
# Some of them are also system dependent
CPP= gcc -E -P
CC = g++
LD = g++
AS = gcc -c

PROGRAM		:=	nachos

MAKEFILES	:=	Makefile \
			../Makefile.common \
			../Makefile.dep

OFILES		:=	$(strip $(C_OFILES) $(S_OFILES))

# RN: Dependency files start with a '.' to avoid annoying completion
# confusion under shell, emacs, etc.

C_DFILES	:=	$(patsubst %.o,.%.d,$(C_OFILES))
S_DFILES	:=	$(patsubst %.o,.%.d,$(S_OFILES))
DFILES		:=	$(strip $(C_DFILES) $(S_DFILES))

# RN: Hummm... There's a lot to tell about the story of the two
# following lines. Essentially, it allows 'make' to implicitely search
# for source/header files in various directories. The original Nachos
# Makefile was not using this 'vpath' feature, although it was using
# the aforementioned implicit search policy! The problem came from
# the rule:
#	$(C_OFILES): %.o:
# 		$(CC) blabla...
# which is correct if .o files have no extra dependency rules. In this
# case, 'make' finds the associated .cc file in the directories it
# knows of (because they were listed in some macros!). However, if we add
# a rule such as
# 	$(C_OFILES): toto
# then 'make' tries to compile 'toto' each time it rebuilds a ".o"
# file. As a result, the former rule was modified as follows
# 	$(C_OFILES): %.o: %.cc
# As you may guess, it did'nt work because 'make' was no longer using
# its @#!^# implicit policy in this case. Crazy, isn't it? Fortunately,
# there's a GNU extension that requires 'make' to use a "search path" for
# files that match a given pattern: this is the vpath directive...
# Well, I guess you should stop wondering why these two lines are here: you'd
# better concentrate on your exercise! ;-)

vpath %.cc ../machine:../threads:../userprog:../filesys:../network:../vm:../
vpath %.S  ../machine:../threads:../userprog:../filesys:../network:../vm:../

# Must be the first rule
.PHONY: default
default: $(PROGRAM)

$(OFILES): $(MAKEFILES)

$(PROGRAM): $(OFILES)
	$(LD) $(OFILES) $(LDFLAGS) -o $(PROGRAM)

$(C_OFILES): %.o: %.cc
	$(CC) $(CFLAGS) -c $< -o $@

switch.o: ../threads/switch.S
	$(CPP) $(INCPATH) $(HOST) ../threads/switch.S > swtch.s
	$(AS) $(ASFLAGS) -o switch.o swtch.s
	rm swtch.s

# RN: Rules to generate dependency files. We can no longer rely on a
# single '.depend' file if we want to avoid a global recompilation each
# time a file is modified! Thus, each %.cc file is associated with its own
# .%.d dependency file...

.PHONY: depend
depend: $(DFILES)

$(DFILES): $(MAKEFILES)

$(C_DFILES): .%.d: %.cc
	$(CC) $(CFLAGS) -MM $< | \
		sed -e 's|\(.*\)\.o:|.\1.d \1.o:|g' > $@

$(S_DFILES): .%.d: %.S
	$(CC) $(CFLAGS) -MM $< | \
		sed -e 's|\(.*\)\.o:|.\1.d \1.o:|g' > $@

ifneq ($(MAKECMDGOALS),clean)
-include $(DFILES)
endif

# Cleaning rules
.PHONY: clean
clean:
	rm -f core nachos DISK *.o *.s .*.d coff2noff out disassemble

.PHONY: distclean
distclean: clean
	rm -f *\~ \#*\#