[C++][Makefile] 没有这样的文件或目录

Question

I'm learning Makefile and I have a problem.

This is my project structure:

root
├── include/
│   └── all .h files here
├── src/
│   └── all .c files here
├── bin/
│   └── output binary
└── Makefile
└── Main.cpp

And this is my makefile:

IMPL_DIR := src
HEADER_DIR := include
BIN_DIR := bin

output: main.o filemanager.o
    g++ -std=c++0x -Wall main.o filemanager.o -o $(BIN_DIR)/login

main.o: main.cpp
    g++ -c main.cpp

filemanager.o: $(HEADER_DIR)/CFileManager.hpp $(IMPL_DIR)/CFileManager.cpp
    g++ -c CFileManager.cpp 

$(BIN_DIR):
    mkdir -p $@

And I have such error:

g++ -c main.cpp
main.cpp:2:10: fatal error: CFileManager.hpp: No such file or directory
    2 | #include "CFileManager.hpp"
      |          ^~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:9: main.o] Error 1

Anyone can help me with this error? Is it problem with my code or project structure? I'm not sure but I think that I should use -I parameter, but I don't know how.

---

UPDATE:

This Makefile works:

IMPL_DIR := src
HEADER_DIR := include
BIN_DIR := bin

output: main.o CFileManager.o
    g++ -std=c++0x -Wall -I$(HEADER_DIR) main.o CFileManager.o -o $(BIN_DIR)/login

main.o: main.cpp | $(BIN_DIR)
    g++ -I$(HEADER_DIR) -c main.cpp

CFileManager.o: $(HEADER_DIR)/CFileManager.hpp $(IMPL_DIR)/CFileManager.cpp
    g++ -I$(HEADER_DIR) -c $(IMPL_DIR)/CFileManager.cpp 

$(BIN_DIR):
    mkdir -p $@

But if I want add line at the end:

clean:
    rm -f *.o

This command doesn't clean*.o objects. Why?

Answer 1

I don't see any usage of -I$(HEADER_DIR) in compiler flags.

IMPL_DIR := src
HEADER_DIR := include
BIN_DIR := bin

output: main.o filemanager.o
    g++ -std=c++0x -Wall -I$(HEADER_DIR) main.o filemanager.o -o $(BIN_DIR)/login

main.o: main.cpp
    g++ -I$(HEADER_DIR) -c main.cpp

filemanager.o: $(HEADER_DIR)/CFileManager.hpp $(IMPL_DIR)/CFileManager.cpp
    g++ -I$(HEADER_DIR) -c CFileManager.cpp 

$(BIN_DIR):
    mkdir -p $@

If you want automatic clean, add the rule before any other rule

all: output clean