can somebody please help me with Makefile

UltimateDesi · 09-15-2010, 10:14 PM

i want to gave much details as possible.

working directory (~/a1/shell)

in the shell directory i have Makefile that i need help with.

also in the shell directory i have subdirectory's (obj, src, include)

obj subdirectory is empty
src subdirectory i have these files inside: parser.c, shutil.c, sshell.c
include subdirectory i have these files inside: parser.h, shell.h

My current Makefile

Quote:

# Beginning of Makefile
OBJS = shutil.o parser.o sshell.o
HEADER_FILES = shell.h parser.h
EXECUTABLE = sshell
CFLAGS = -Wall
CC = gcc
# End of configuration options

#What needs to be built to make all files and dependencies
all: $(EXECUTABLE)

#Create the main executable
$(EXECUTABLE): $(OBJS)
$(CC) -o $(EXECUTABLE) $(OBJS)

#Recursively build object files
%.o: %.c
$(CC) $(CFLAGS) -c -o $@ $<

#Define dependencies for objects based on header files
#We are overly conservative here, parser.o should depend on parser.h only
$(OBJS) : $(HEADER_FILES)

clean:
-rm -f $(EXECUTABLE) *.o
run: $(EXECUTABLE)
./$(EXECUTABLE)

tarball:
-rm -f $(EXECUTABLE) *.o
(cd .. ; tar czf UltimateDesi_a1.tar.z shell )

# End of Makefile

I wanted it so: all .o files are created in the obj subdirectory, and my application, sshell, is created in the shell directory.

i am getting this error when i run the make run: No rule to make target 'shell.h', needed by 'shutil.o'. stop

Can somebody please help me, i am new to Makefile and new to unix/linux.

Jerry Mcguire · 09-15-2010, 11:18 PM

The following is what I usually do. You have to modify the paths somehow...

Makefile:

Code:

#!make
SHELL := /bin/sh

# there may be more executables in your system
executables=sshell
CFLAGS=-Wall
CC=gcc

# need to tell make that 'all' is not a target output
.PHONY : all
all: $(executables)

# write your executable's dependencies by yourself for each executable in your system.
sshell: sshell.o a.o b.o c.o
<A TAB CHARACTER HERE>$(CC) -o $@ $^

# write the following dependencies by the command `gcc -MM *.cc *.c`
# no need to write the command if your source file extensions is default to 'make'.  i.e. 'make' knows how to make a.o from a.c
a.o: a.c a.h
b.o: b.c
c.o: c.c c.h
sshell.o a.h c.h

Then `make all` will do its work.

See http://www.gnu.org/software/make/manual/make.html