# A Makefile to build sbs

# The CFLAGS variable contains a set of compiler flags 
# -g means include information for a debugger
# -Wall means print out all warnings
# Your submitted progam should compile cleanly with no warning messages.
# -ansi -pedantic are not required for this programs submitted for 209

CFLAGS = -g -Wall

# The standard set of variables found in most Makefiles
# LIBS and INCLUDES are empty because we do not need any special libraries 
# or include paths.
CC = gcc
LIBS = 
INCLUDES =
OBJS = psort.o data.o readn.o writen.o
SRCS = psort.c data.c  readn.c writen.c
HDRS =  data.h io.h

# The first target is the default target.  If you type "make" this is the
# rule that will be evaluated.  This target depends on sbs which is the
# next target.  (Note that if you want to compile more than one program
# using the same Makefile, list all targets as dependencies in the default
# target.)

all: psort readurls showurls ssort

# The variable $@ has the value of the target. In this case $@ = pusage
psort: ${OBJS}
	${CC} ${CFLAGS} ${INCLUDES} -o $@ ${OBJS} ${LIBS}

readurls: readurls.o
	${CC} ${CFLAGS} -o $@ readurls.o -lm
showurls: showurls.o
	${CC} ${CFLAGS} -o $@ showurls.o 
ssort: ssort.o
	${CC} ${CFLAGS} -o $@ ssort.o data.o

# This rule tells make how to create .o files (which are dependencies in
# the psort rule).  Since readn depends on "readn.o", make looks
# for a file called "readn.c" in the current directory and uses this
# rule to compile the file.  The variable $< has the value of the .c
# file that it found.  

.c.o:
	${CC} ${CFLAGS} ${INCLUDES} -c $<

# To ensure that when you change a header file the dependencies are properly
# accounted for, run make depend when ever you add a new source file or some 
# #include statements in a file.
depend: 
	makedepend ${SRCS}

# An easy way to keep your directory clean
clean:
	rm *.o core *~

# A handy rule to package up your code.
tar:
	tar cf psort-code.tar  Makefile *.c *.h runtests 

# A favourite rule of mine.  It creates a postscript file and simplifies 
# printing your code.  It saves on paper by combining all the files into one 
# before printing.
print:
	more Makefile $(HDRS) $(SRCS) | enscript -2r -p listing.ps

# DO NOT DELETE