Background
I am just getting started with C++ programming on LINUX. In my last question, I asked about best practices of using makefiles for a big application. "SO" users suggested to read Miller's paper on recursive makefiles and avoid makefile recursion (I was using recursive makefiles).
I have followed miller and created a makefile like the below. Following is the project structure
root
...makefile
...main.cpp
...foo
......foo.cpp
......foo.h
......module.mk
My makefile looks like the below
#Main makefile which does the build
CFLAGS =
CC = g++
PROG = fooexe
#each module will append the source files to here
SRC :=
#including the description
include foo/module.mk
OBJ := $(patsubst %.cpp, %.o, $(filter %.cpp,$(SRC))) main.o
#linking the program
fooexe: $(OBJ)
$(CC) -o $(PROG) $(OBJ)
%.o:
$(CC) -c $(SRC)
main.o:
$(CC) -c main.cpp
depend:
makedepend -- $(CFLAGS) -- $(SRC)
.PHONY:clean
clean:
rm -f *.o
Here is the module.mk in foo directory.
SRC += foo/foo.cpp
When I run make -n, I get the following output.
g++ -c foo/foo.cpp
g++ -c main.cpp
g++ -o fooexe foo/foo.o main.o
Questions
- Where should I create the object(.o) files? All object files in a single directory or each object files in it's own modules directory? I mean which is the best place to generate foo.o? Is it in foo directory or the root (My example generates in the root)?
- In the provided example, g++ -c foo/foo.cpp command generates the .o file in the root directory. But when linking(g++ -o fooexe foo/foo.o main.o) it is looking for the foo/foo.o. How can I correct this?
Any help would be great
