Makefile doesn't find .hpp - c++

Question

I have 2 directories in my project, one called Builds, who has the Makefile and a test program ( test-P0-consola.cpp ) and other one directory called P0 who constains the classes I use, cadena (string) and fecha (date).
test-P0-consola.cpp includes both of them, but Make doesn't find them.
CPP = g++
CPPFLAGS = -std=c++14 -g -Wall -pedantic
VPATH = ../P0:.:..
test-consola: test-P0-consola.o fecha.o cadena.o
${CPP} ${CPPFLAGS} -o $#.ex $^
test-P0-consola.o: test-P0-consola.cpp fecha.hpp cadena.hpp
${CPP} -c ${CPPFLAGS} $< -o $#
fecha.o: fecha.hpp
cadena.o: cadena.hpp
It throws the fatal error "cadena.hpp doesn't exist the file or directory" when it tries to compile test-P0-consola.o, but It find them out when I force it to compile cadena or fecha. I'm using GCC and Ubuntu.
..
├── Builds
│   ├── makefile.mak
│   └── test-P0-consola.cpp
├── P0
│   ├── cadena.cpp
│   ├── cadena.hpp
│   ├── fecha.cpp
│   └── fecha.hpp
EDIT
Error:
g++ -std=c++14 -g -Wall -pedantic -c test-P0-consola.cpp
test-P0-consola.cpp:7:21: fatal error: fecha.hpp: There is no file or directory
compilation terminated.
makefile.mak:9: Failure in the instructions for the objective 'test-P0-consola.o'
make: *** [test-P0-consola.o] Error 1

Answer 1

Look closely at your error:
test-P0-consola.cpp:7:21: fatal error: fecha.hpp: There is no file or directory
You probably have something like:
// test-P0-consola.cpp
#include "fetcha.hpp"
But fetcha.hpp is not in that directory, so it can't find it. You either need to change the way you include the file directly (via #include "../P0/fetcha.hpp") or to change the build rule to pass in an additional include path (via -I../P0).
Note: I'm not sure there's a reason to add . to VPATH. That's kind of implicit.
Note 2: this is a bad idea:
test-consola: test-P0-consola.o fecha.o cadena.o
${CPP} ${CPPFLAGS} -o $#.ex $^
~~~~~
Don't lie to Make. The result of running a recipe should be the target file, except for PHONY targets. The recipe here should be -o $#. If you want the .ex suffix, you should change the target to be test-consola.ex. If you still want the rule to be named test-consola, you'll want:
test-consola : test-consola.ex
test-consola : .PHONY

Answer 2

You should put in the makefile the include path of the .hpp files you need the compiler to use. You should use the -Ipath compiler directive, where path is the path of your include files.
See `Makefile: How to correctly include header file and its directory?
and
How to define several include path in Makefile
Something like:
CPP = g++
CPPFLAGS = -std=c++14 -g -Wall -pedantic
INC = -Iyourincludebasepath/P0
VPATH = ../P0:.:..
test-consola: test-P0-consola.o fecha.o cadena.o
${CPP} ${CPPFLAGS} ${INC} -o $#.ex $^
test-P0-consola.o: test-P0-consola.cpp fecha.hpp cadena.hpp
${CPP} -c ${CPPFLAGS} ${INC} $< -o $#
fecha.o: fecha.hpp
cadena.o: cadena.hpp