Makefile for windows

[pipa]

Hi All,
I hope I am not doing some unusual thing. I use to work in EMACS and used GDB for running and compiling my C++ code in LINUX environment. I have to move to windows now but I do not want to leave EMACS and GDB. I installed g++ and EMACS in windows successfully but I am unable to run the program because of the makefile errors. I get the following error:

make
make: *** No rule to make target `main.o', needed by `main.exe'.  Stop

Here is my makefile which I used in linux:

EXEC	= main.exe

CC	= g++ -g -O2 -Wall 

CSRC 	= main.cpp Eulerian.cpp Util.cpp  advectPar.cpp Random.cpp Dispersion.cpp Turbulence.cpp LocalMixing.cpp

COBJS   = $(CSRC:.cpp=.o)


$(EXEC): $(COBJS)
	$(CC) -o $(EXEC) $(COBJS)  

%.o : %.cpp %.h
	$(CC)  -c $<

clean:
	rm -f $(EXEC) *.o *.o

Thanks a lot in advance.

Pipa-

[pipa]

Can somebdy please help me?? Please.

[Marc G]

I've never played with this myself, but is g++ in your path?

[pipa]

I've never played with this myself, but is g++ in your path?

Yeah, g++ is in my path. It works fine from the Dos prompt.

Thanks for you reply!

[ZuK]

You could call make with the -d switch to see if make recognices the implicit rule .cpp -> .o
Kurt

edit:
try to add this rule

%.o:    %.cpp
        $(CC) -c $< $(CFLAGS) -o $@

Another EDIT:
Played a little with your makefile.
The only case where I could reproduce your error message was when main.cpp was missing.
Kurt

[pipa]

Thanks for your reply.
I did "make -d" and Emacs printed out a lot of lines...which I was not able to understand.

Also, I dont have any variable named CFLAGS. Can I still use the above rule you stated in your reply?

Thanks a lot for your reply!

[ZuK]

I dont have any variable named CFLAGS. Can I still use the above rule you stated in your reply?

That should not matter but I noticed that you alredy have a rule

%.o : %.cpp %.h
	$(CC)  -c $<

This is basically the same and should work as well.


Are you shure there is a file main.cpp ? ( see the edit of my last post ).
Kurt
EDIT: Just noticed that all the all the other filenames start with a Uppercase letter. Could imagine that GNU make makes a difference between main.cpp and Main.cpp even on Windows.
Kurt

[pipa]

Yeah, I have a file named main.cpp in that folder.

if I compile by using "make -k"
I get the fllowing:

g++ -g -O2 -Wall   -c Eulerian.cpp
In file included from Eulerian.cpp:5:
Turbulence.h:19: warning: `class turbulence' has virtual functions but non-virtual destructor
In file included from Eulerian.cpp:6:
LocalMixing.h:14: warning: `class localMixing' has virtual functions but non-virtual destructor
Eulerian.cpp: In method `void eulerian::createEul(const class util &)':
Eulerian.cpp:23: no matching function for call to `vector<double,__default_alloc_template<false,0> >::at (int &)'
Eulerian.cpp: In method `void eulerian::uniform()':
Eulerian.cpp:63: no matching function for call to `vector<eulerian::wind,__default_alloc_template<false,0> >::at (int &)'
Eulerian.cpp:64: no matching function for call to `vector<eulerian::wind,__default_alloc_template<false,0> >::at (int &)'

Which indicates that i have main.cpp.

Thanks for your quick replies.

Thanks

[Peter_B]

This rule:

%.o : %.cpp %.h
	$(CC)  -c $<

will only work for main.o if you have both main.cpp and main.h. Presumably you don't have the latter.

[ZuK]

Which indicates that i have main.cpp.

Does it ?
To me it only indicates that the first action was to compile the second file because you told to keep going even if there are errors ( -k )
Kurt

[pipa]

Thanks again.
I don't have main.h. Is that a problem? What should I do in this situation?

Thanks

[Peter_B]

Thanks again.
I don't have main.h. Is that a problem? What should I do in this situation?

Thanks

You do not need the %.h prerequisite for the %.o target rule.
This is the rule you need:

%.o : %.cpp
	$(CC)  -c $<

Incidentally, this rule (or one functionally equivalent) is one of the built-in rules for GNU make, so you don't even need this in your makefile.

Then, you need to add rules outlining the dependencies of the particular object files on the header files, e.g.

Eulerian.o : Eulerian.h Util.h // Or whatever header files Eulerian.cpp includes
Util.o : Util.h
advectPar.o : advectPar.h
etc...

You can also use g++ to calculate the dependencies on header files for you. The GNU Make manual explains all this much more thoroughly than I can:
http://www.gnu.org/software/make/manual/

[pipa]

Thanks Peter_B, I will try this out and read the manual.