#
# This makefile system follows the structuring conventions
# recommended by Peter Miller in his excellent paper:
#
#	Recursive Make Considered Harmful
#	http://aegis.sourceforge.net/auug97.pdf
#
OBJDIR := obj

ifdef GCCPREFIX
SETTINGGCCPREFIX := true
else
-include .gccsetup
endif

ifdef LAB
SETTINGLAB := true
else
-include .labsetup
endif


LABADJUST := 0
-include .classconfig

TOP = .

# Cross-compiler jos toolchain
# Users of 32-bit x86 ELF platforms can leave GCCPREFIX empty,
# so that they can use the native compilers for their systems.
# People on other systems (e.g., x86-64 or Mac OS X) will need
# to install an i386-jos-elf tool chain and set GCCPREFIX
# by doing
#
#	make 'GCCPREFIX=i386-jos-elf-' gccsetup
#

CC	:= $(GCCPREFIX)gcc -pipe
GCC_LIB := $(shell $(CC) -print-libgcc-file-name)
AS	:= $(GCCPREFIX)as
AR	:= $(GCCPREFIX)ar
LD	:= $(GCCPREFIX)ld
OBJCOPY	:= $(GCCPREFIX)objcopy
OBJDUMP	:= $(GCCPREFIX)objdump
NM	:= $(GCCPREFIX)nm

# Native commands
NCC	:= gcc $(CC_VER) -pipe
TAR	:= gtar
PERL	:= perl

#
SPLICER := ./splicer.py

# Compiler flags
# Note that -O2 is required for the boot loader to fit within 512 bytes;
# -fno-builtin is required to avoid refs to undefined functions in the kernel.
CFLAGS	:= $(CFLAGS) $(DEFS) -O2 -fno-builtin -I$(TOP) -MD -Wall -Wno-format -ggdb

# Linker flags for user programs
ULDFLAGS := -Ttext 0x800020

# Lists that the */Makefrag makefile fragments will add to
OBJDIRS :=


# Make sure that 'all' is the first target
all:


# Eliminate default suffix rules
.SUFFIXES:

# Delete target files if there is an error (or make is interrupted)
.DELETE_ON_ERROR:

# make it so that no intermediate .o files are ever deleted
.SECONDARY:

# Rules for building regular object files
$(OBJDIR)/%.o: %.c
	@echo cc $<
	@mkdir -p $(@D)
	@$(CC) -nostdinc $(CFLAGS) -c -o $@ $<

$(OBJDIR)/%.o: %.S
	@mkdir -p $(@D)
	@echo as $<
	@$(CC) -nostdinc $(CFLAGS) -c -o $@ $<


# Setup a prefix for the GCC tools if we're cross-compiling.
gccsetup:
	echo >.gccsetup "GCCPREFIX=$(GCCPREFIX)"



# Include Makefrags for subdirectories
include boot/Makefrag
include kern/Makefrag
include lib/Makefrag
include user/Makefrag


bochs: $(OBJDIR)/kern/bochs.img $(OBJDIR)/fs/fs.img
	bochs-nogui

# For deleting the build
clean:
	rm -rf $(OBJDIR)

grade:
	@gmake clean >/dev/null 2>/dev/null
	gmake all
	sh grade.sh

HANDIN_CMD = tar cf - . | gzip | uuencode lab$(LAB).tar.gz | mail 6.828-handin@pdos.lcs.mit.edu
handin: clean
	$(HANDIN_CMD)

# For test runs
run-%:
	@rm -f $(OBJDIR)/kern/init.o $(OBJDIR)/kern/bochs.img
	@gmake "DEFS=-DTEST=binary_user_$*_start -DTESTSIZE=binary_user_$*_size" $(OBJDIR)/kern/bochs.img $(OBJDIR)/fs/fs.img
	bochs-nogui

xrun-%:
	@rm -f $(OBJDIR)/kern/init.o $(OBJDIR)/kern/bochs.img
	@gmake "DEFS=-DTEST=binary_user_$*_start -DTESTSIZE=binary_user_$*_size" $(OBJDIR)/kern/bochs.img $(OBJDIR)/fs/fs.img
	bochs

# This magic automatically generates makefile dependencies
# for header files included from C source files we compile,
# and keeps those dependencies up-to-date every time we recompile.
# See 'mergedep.pl' for more information.
$(OBJDIR)/.deps: $(foreach dir, $(OBJDIRS), $(wildcard $(OBJDIR)/$(dir)/*.d))
	@mkdir -p $(@D)
	@$(PERL) mergedep.pl $@ $^

-include $(OBJDIR)/.deps

.phony: lab%.tar.gz