Thread: G++ Makefile Help Needed

Hello everyone, I've been having some issues with makefiles. My school uses a Linux server and such, so I have to reference some files in a directory on the network, as well as my own files. Anyway, here is my makefile, comments removed:

Code:

FREYS_DIR = /afs/umbc.edu/users/f/r/frey/pub/CMSC341/Proj4

PROJ = Proj4
CC = /usr/local/bin/g++
CCLFAGS = -g -ansi -Wall -I .

SOURCES = \
Proj4.cpp \
kary_heap.h

PROVIDED_SOURCES = $(FREYS_DIR)/CPUTimer.cpp

OBJECTS = Proj4.o CPUTimer.o

$(PROJ): $(FREYS_DIR)/$(PROJ) $(OBJECTS)
$(CC) $(CCFLAGS) -o $(PROJ)  $(OBJECTS)

Proj4.o: $(FREYS_DIR)/Proj4.cpp kary_heap.h CPUTimer.cpp CPUTimer.h
$(CC) $(CCFLAGS) -c $(FREYS_DIR)/Proj4.cpp

CPUTimer.o: CPUTimer.cpp CPUTimer.h
$(CC) $(CCFLAGS) -c CPUTimer.cpp

Also, the tabs for the compiling parts have been removed, simply to make it look nice, but they are there.

Anyway, the error I get is as follows:

Code:

make: *** No rule to make target `/afs/umbc.edu/users/f/r/frey/pub/CMSC341/Proj4/Proj4.cpp',
needed by `/afs/umbc.edu/users/f/r/frey/pub/CMSC341/Proj4/Proj4'.  Stop.

Can anyone see what I'm doing wrong? I must admit, I'm not too experienced with Makefiles and I have yet to receive a response from the faculty.

Originally Posted by OWD2k7

Code:

make: *** No rule to make target `/afs/umbc.edu/users/f/r/frey/pub/CMSC341/Proj4/Proj4.cpp',
needed by `/afs/umbc.edu/users/f/r/frey/pub/CMSC341/Proj4/Proj4'.  Stop.

It means that there is no such file /afs/umbc.edu/users/f/r/frey/pub/CMSC341/Proj4/Proj4.cpp

Hmm. Thank you for the reply. I assume this means I need to use the directory where my file is submitted? I'm not entirely sure what part of the Makefile controls this, but I'll tinker around with it some.

Thanks again!

Originally Posted by OWD2k7

Hmm. Thank you for the reply. I assume this means I need to use the directory where my file is submitted? I'm not entirely sure what part of the Makefile controls this, but I'll tinker around with it some.

Thanks again!

Well, are your project files in the same directory as the makefile? This makefile is overly complicated.

Indeed, I thought the Makefile was overly complicated. I typically make mine a lot smaller, but the problem is that I had two make two files (Proj4 and kary_heap), which are in my directory with the Makefile, and reference two other files (CPUTimer.cpp and CPUTimer.h, and thus, CPUTimer.o), so I used an older makefile provided by the teacher which did something similar.

Tinkering around, I've actually been able to make it work by eliminating all references to to the teacher's directory before Proj4.cpp. The problem now, however, is that it doesn't seem to be getting the teacher's CPUTimer file.

The modified parts of the makefile:

Code:

Proj4.o: Proj4.cpp kary_heap.h CPUTimer.cpp CPUTimer.h
$(CC) $(CCFLAGS) -c Proj4.cpp

CPUTimer.o: $(FREYS_DIR)/CPUTimer.cpp CPUTimer.h
$(CC) $(CCFLAGS) -c CPUTimer.cpp

Which now gives me the output:

Code:

make: Circular Proj4 <- Proj4 dependency dropped.
/usr/local/bin/g++ -g -ansi -Wall -I . -c Proj4.cpp
Proj4.cpp: In function 'int main(int, char**)':
Proj4.cpp:17: error: 'CPUTimer' was not declared in this scope

The make seems to work, but it's ignoring the author's files. Do you have any suggestions? Thanks again for your help.

Originally Posted by Salem

> Proj4.o: Proj4.cpp kary_heap.h CPUTimer.cpp CPUTimer.h
Get rid of that, you don't need one .cpp depending on another. You already have the header file, that's all you need.

Should I actually change that to CPUTimer.o?

Having done some more modifications, when I use the tool to run the Makefile from the submit directory, I receive the following output:

Code:

make: *** No rule to make target `CPUTimer.h', needed by `Proj4.o'.  Stop.

This is after I followed your suggest and removed CPUTimer.cpp.

Thanks for the help as well.

I'm not entirely sure, either. As I said, I'm not too experienced with Makefiles and I'm just using a provided one as a reference.

I seem to have the Makefile working the way it should, however, it will not use the CPUTimer object (in the code) unless I include the CPUTimer header in my Proj4 source file. This seems to imply that it's not linking the CPUTimer.cpp object properly. This is the Makefile as it currently stands:

Code:

$(PROJ): $(FREYS_DIR)/$(PROJ) $(OBJECTS)
$(CC) $(CCFLAGS) -o $(PROJ)  $(OBJECTS)

Proj4.o: Proj4.cpp kary_heap.h CPUTimer.o
$(CC) $(CCFLAGS) -c Proj4.cpp

CPUTimer.o: $(FREYS_DIR)/CPUTimer.cpp $(FREYS_DIR)/CPUTimer.h
$(CC) $(CCFLAGS) -c $(FREYS_DIR)/CPUTimer.cpp

The problem it's giving me now is:

Code:

Proj4.cpp: In function 'int main(int, char**)':
Proj4.cpp:18: error: 'CPUTimer' was not declared in this scope

As I said, this implies it's not including the CPUTimer.cpp or something.. I can't include the Header file in my Proj4.cpp, because this seems to keep me from actually using the functions within CPUTimer.cpp..

Any additional help? Much appreciated, everyone.

Originally Posted by Salem

But why you seem to be trying to make a .h file as a target is beyond me.

He's NOT, the message just means that the file is missing. So make tries to create it, and sees that there is no rule for it.

Thanks for all of the help, brewbuck. I'll try that in a moment and let you know.

Originally Posted by OWD2k7

Thanks for all of the help, brewbuck. I'll try that in a moment and let you know.

By the way, if this project includes some .cpp files that your instructor provides for you, DON'T just reference them by their full path. This will cause the "clean" function to blow away your instructor's files. Instead, COPY the files into your project directory.

Originally Posted by OWD2k7

I tried your Makefile, and it works the same way mine did; but it still gives me the same errors:

These are just programming errors, not related to the makefile. You seem to not be including a proper .h somewhere.

The problem is, I'm not allowed to copy the instructor's files into my directory. It's one of the stipulations of the project, and the biggest source of my headache.. The grading script deletes these files from my folder if it finds them.

Is the purpose of this assignment to learn how to write makefiles? If not, I think this requirement is stupid. But I guess it is what it is. In that case, have a look at my original post -- I'll modify the makefile to try to allow you to build from your instructor's files directly.