Beginning Linux Programming by Neil Matthew & Richard Stones

Author:Neil Matthew & Richard Stones
Language: eng
Format: mobi, epub
Publisher: Wiley Publishing, Inc.
Published: 2011-04-13T16:00:00+00:00

Multiple Targets

It’s often useful to make more than a single target file, or to collect several groups of commands into a single place. You can extend your makefile to do this. In the following example, you add a clean option that removes unwanted objects and an install option that moves the finished application to a different directory.

Try It Out Multiple Targets

Here’s the next version of the makefile, Makefile3:

all: myapp

# Which compiler

CC = gcc

# Where to install

INSTDIR = /usr/local/bin

# Where are include files kept

INCLUDE = .

# Options for development

CFLAGS = -g -Wall –ansi

# Options for release

# CFLAGS = -O -Wall –ansi

myapp: main.o 2.o 3.o

$(CC) -o myapp main.o 2.o 3.o

main.o: main.c a.h

$(CC) -I$(INCLUDE) $(CFLAGS) -c main.c

2.o: 2.c a.h b.h

$(CC) -I$(INCLUDE) $(CFLAGS) -c 2.c

3.o: 3.c b.h c.h

$(CC) -I$(INCLUDE) $(CFLAGS) -c 3.c

clean:

-rm main.o 2.o 3.o

install: myapp

@if [ -d $(INSTDIR) ]; \

then \

cp myapp $(INSTDIR);\

chmod a+x $(INSTDIR)/myapp;\

chmod og-w $(INSTDIR)/myapp;\

echo "Installed in $(INSTDIR)";\

else \

echo "Sorry, $(INSTDIR) does not exist";\

fi

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