Make File Page:

examples:

wget http://home.adelphi.edu/~pe16132/csc270/note/SampleCode/cplus/guySample2/guy2.cpp

wget http://home.adelphi.edu/~pe16132/csc270/note/SampleCode/cplus/guySample2/guy2.h

wget http://home.adelphi.edu/~pe16132/csc270/note/SampleCode/cplus/guySample2/guy2app.cpp

wget http://home.adelphi.edu/~pe16132/csc270/note/SampleCode/cplus/guySample2/Makefile

wget http://home.adelphi.edu/~pe16132/csc270/note/SampleCode/cplus/guySample2/MakefileBetter

http://www.codeproject.com/Articles/31488/Makefiles-in-Linux-An-Overview

Makefile

Note that this contains 3 compilation steps:

1) guy2.o is created whenever guy2.cpp or guy2.h changes

• using g++ -c guy2.cpp ;
• use -c option to supress linking
• TAB is so important - the caracter before each compilation must be a tab!

2) guy2app.o is created whenever guy2app.cpp or guy2.h is created.

3) guy2app is created whenever guy2app.o or guy2.o changes

• Make with make -f mkfile.
• When name is Makefile , just use make
  • If no parm follows all and makes all needed
  • If parm - starts at that tag (make clean)
• Notice if h file were not included, changes to h file would not cause compilation.
• See how -c is used to suppress linking until all objects are made.
• TAB is so important - the caracter before each compilation must be a tab!

  all: guy2app.o guy2.o
  g++ guy2app.o guy2.o -o guy2app

  guy2app.o: guy2app.cpp guy2.h
  g++ -c guy2app.cpp

  guy2.o: guy2.cpp guy2.h
  g++ -c guy2.cpp
  

In MakefileBetter

• Define Macros VAR=
• Use macros with $( )

  # build an executable for guy2app from my guy2app.cpp and guy2 files
  # (note: the <tab> in the command line is necessary for make to work)

  # the variable CC will be the compiler to use.
  CC=g++
  # that CFLAGS will be the options I'll pass to the compiler.
  CFLAGS= -Wall

  all: guy2app
  guy2app: guy2app.o guy2.o
  $(CC) $(CFLAGS) guy2app.o guy2.o -o guy2app

  guy2app.o: guy2app.cpp guy2.h
  $(CC) $(CFLAGS) -c guy2app.cpp

  guy2.o: guy2.cpp guy2.h
  $(CC) $(CFLAGS) -c guy2.cpp

  clean:
  rm guy2app guy2.o guy2app.o