Creating makefile c++ that stores .o to a directory - c++

Question

Here is an example of how my datas are stored :
\Program
main.cpp
makefile
\Part1
file1.cpp
file1.h
file2.cpp
etc
\Part2
file3.cpp
file4.cpp
file4.h
etc..
\Part3
file5.cpp
file5.h
etc..
\Objects
file1.o
file2.o
file3.o
file4.o
I think you understood.
My problem is that whatever I try my makefile does not work
clang: error: no input files
or
Undefined symbols for architecture x86_64:
Well, I tried to learn by myself how to build a makefile. I leant the easiest way like :
all:exe
exe: Objects/file1.o Objects/file2.o Objects/file3.o Objects/file4.o Objects/file5.o .....
$(CPP) $(LFLAGS) Objects/file1.o Objects/file2.o Objects/file3.o ... -o exe
And then, for each .o I ask the makefile to do like :
Objects/file1.0: Part1/file1.cpp
$(CPP) $(CFLAGS) -o $(OBJ/file1).o Part1/file1.o
But I keep having this issue :
makefile:XX: warning: overriding commands for target .o'
makefile:XX: warning: ignoring old commands for target.o'
For every file
I tried to learn how to build makefile more proprelly but it's quite difficult. I tried many, many things and it doesn't work.
Here is what I mean when I say a proper way to write makefile
ALL_CPP=Part1/*.cpp, Part2/*.cpp, Part3/*.cpp, Part4/*.cpp
CPP_FILES := $(wildcard $(ALL_CPP))
OBJ_FILES = $(patsubst $(ALL_CPP),Objects/%.o,$(CPP_FILES))
main: $(OBJ_FILES)
g++ -o $# $^
Objects/%.o: Animal/%.cpp
g++ $(CFLAGS) -c -o $# $<
Objects/%.o: Enclos/%.cpp
g++ $(CFLAGS) -c -o $# $<
Objects/%.o: Menu/%.cpp
g++ $(CFLAGS) -c -o $# $<
Objects/%.o: Zoo/%.cpp
g++ $(CFLAGS) -c -o $# $<
But of course it doesn't work.
My question is :
How to create a makefile which would work in an environment like mine (with different subfolder) and which would store the .o in a dedicated folder.
I worked using xcode but unfortunately I want a menu where you can navigate using the arrows which doesn't work on the xcode console.

Answer 1

Your second attempt was pretty close.
The problem is with this line
OBJ_FILES = $(patsubst $(ALL_CPP),Objects/%.o,$(CPP_FILES))
The first argument to $(patsubst) is the pattern to match but $(ALL_CPP) isn't a pattern. You want dir/%.c for each directory there. You could make that list of patterns if you really wanted to but there's a better way to do it.
You really have two transformations here. One to replace any leading directory with Objects and one to replace .cpp with .o.
So do them separately.
Use a Substitution Reference for the first part:
OBJ_FILES := $(CPP_FILES:.cpp=.o)
and the notdir and addprefix file name functions for the second part:
OBJ_FILES := $(addprefix Objects/,$(notdir $(OBJ_FILES))
and that should make things work.