Shell Programming and Scripting

#!/bin/bash

opt=$1
case $opt in
        -help)
                echo "compiler with -help..."
                ;;
        -backup)
                echo "compiler with -backup..."
                ;;
        -clean)
                echo "compiler with -clean..."
                ;;
        *)
                echo "Usage: $0 {-help|-backup|-clean}"
                exit
                ;;
esac

$ cat Makefile

PROJECT = MyProject
EXECUTABLE = MyProgram
SOURCE = file1.c file2.c file3.c
OBJECTS = file1.o file2.o file3.o
#This is an easier way to define OBJECTS:
#OBJECTS = $(OBJECTS:%.c=%.o)

help:
   echo Here is a help message

# Prior to "backup", make will run "clean".
backup: clean
   cd .. && tar czvf /backup/$(PROJECT).tar.gz $(PROJECT)

clean:
   rm -f $(OBJECTS) $(EXECUTABLE)

CFLAGS = -Wall -ggdb3 -DSOME_DEFINE=1
LDFLAGS = -L/usr/local/lib -lsomelibname

# All the magic is here

# This is your main target, which depends upon target "program",
# you executable file.

all: $(EXECUTABLE)

# To build "$(EXECUTABLE)", you first need to build all separeted object file,
# i.e., each of your .c file must produce a corresponding .o file
# The special variable $@ means "the target name". On this case, it is "$(EXECUTABLE)'s value"
# The special variable $^ means "all depend targets". On this case, it is $(OBJECTS)'s value

$(EXECUTABLE): $(OBJECTS)
   gcc $(LDFLAGS) $(CFLAGS) -o $@ $^

# This is where any .c file becomes .o file

%.o: %.c
   gcc $(CFLAGS) -c $^ -o $@

$ make all

$ make clean

$ make help
$ make backup