Issue generating MOC files for QT using a makefile - qt

Question

Hello i am trying to generate MOC files for QT using a makeifle.
The problem is a command is executing from somewhere and i can't find from where....
This is my makefile
BUILD = Build
### SOURCES ###
SRC = Src/Main\
Src/DialogBox/DialogBox
### MOC SOURCES ###
MOC_SRC = Src/DialogBox/DialogBox
### OBJECTS ###
OBJ = $(addsuffix .o, $(addprefix $(BUILD)/, $(SRC)))
OBJ += $(addsuffix .moc.o, $(addprefix $(BUILD)/, $(MOC_SRC)))
### INCLUDES ###
INC = TOO MANY INCLUDES TO PUT HERE....
### LINKER FLAGS ###
LDFLAGS = -LC:/Qt/5.15.0/mingw81_32/lib
LDLIBS = -lQt5Quick -lQt5PrintSupport -lQt5Qml -lQt5Network -lQt5Widgets -lQt5Gui -lQt5Core
### COMPILER FLAGS
CFLAGS = $(INC)
### COMPILER ###
CC = g++
### QT MOC ###
MOC = moc
all: $(BUILD)/test.exe
$(BUILD)/test.exe: $(OBJ)
#echo LINKING $^
#$(CC) $(LDFLAGS) -o $# $^ $(LDLIBS)
$(BUILD)/%.o: %.cpp
#echo COMPILING $<
#mkdir -p $(subst /,\,$(dir $#))
#$(CC) $(CFLAGS) -M -MT $# -o $(patsubst %.o, %.d, $#) $<
#$(CC) $(CFLAGS) -o $# -c $<
$(BUILD)/%.moc.cpp: %.h
#echo MOCCING $<
$(MOC) $< -o $#
#echo MOC END
-include $(OBJ:.o=.d)
.PHONY: clean
clean:
#echo CLEANING......
#rm -rf $(BUILD)/Src $(BUILD)/test.exe
This is the result:
COMPILING Src/Main.cpp
COMPILING Src/DialogBox/DialogBox.cpp
MOCCING Src/DialogBox/DialogBox.h
moc Src/DialogBox/DialogBox.h -o Build/Src/DialogBox/DialogBox.moc.cpp
MOC END
g++ -c -o Build/Src/DialogBox/DialogBox.moc.o Build/Src/DialogBox/DialogBox.moc.cpp
In file included from Build/Src/DialogBox/DialogBox.moc.cpp:10:0:
Build/Src/DialogBox/../../../Src/DialogBox/DialogBox.h:4:19: fatal error: QDialog: No such file or directory
#include "QDialog"
^
compilation terminated.
make: *** [<builtin>: Build/Src/DialogBox/DialogBox.moc.o] Error 1
rm Build/Src/DialogBox/DialogBox.moc.cpp
Basically i have only two source files: Main.cpp and DialogBox.cpp.
I want to generate MOC file from DialogBox.h.
The problem is this command:
g++ -c -o Build/Src/DialogBox/DialogBox.moc.o Build/Src/DialogBox/DialogBox.moc.cpp
I don't understand why it's executing...
EDIT:
Even after:
MOCCING Src/DialogBox/DialogBox.h
moc Src/DialogBox/DialogBox.h -o Build/Src/DialogBox/DialogBox.moc.cpp
MOC END
no such file Build/Src/DialogBox/DialogBox.moc.cpp exists.Why?

Answer 1

I finally fixed it.As #G.M. suggested in the comments, probably an implicit rule is executing so i decided to write my own to avoid that.
I added this:
$(BUILD)/%.moc.o: $(BUILD)/%.moc.cpp
#echo COMPILING MOC $<
#mkdir -p $(subst /,\,$(dir $#))
#$(CC) $(CFLAGS) -M -MT $# -o $(patsubst %.o, %.d, $#) $<
#$(CC) $(CFLAGS) -o $# -c $<
and everything works fine.
The complete makefile:
BUILD = Build
### SOURCES ###
SRC = Src/Main\
Src/DialogBox/DialogBox
### MOC SOURCES ###
MOC_SRC = Src/DialogBox/DialogBox
### OBJECTS ###
OBJ = $(addsuffix .o, $(addprefix $(BUILD)/, $(SRC)))
OBJ += $(addsuffix .moc.o, $(addprefix $(BUILD)/, $(MOC_SRC)))
### INCLUDES ###
INC = TOO MANY INCLUDES TO PUT HERE....
### LINKER FLAGS ###
LDFLAGS = -LC:/Qt/5.15.0/mingw81_32/lib
LDLIBS = -lQt5Quick -lQt5PrintSupport -lQt5Qml -lQt5Network -lQt5Widgets -lQt5Gui -lQt5Core
### COMPILER FLAGS
CFLAGS = $(INC)
### COMPILER ###
CC = g++
### QT MOC ###
MOC = moc
all: $(BUILD)/test.exe
$(BUILD)/test.exe: $(OBJ)
#echo LINKING $^
#$(CC) $(LDFLAGS) -o $# $^ $(LDLIBS)
$(BUILD)/%.o: %.cpp
#echo COMPILING $<
#mkdir -p $(subst /,\,$(dir $#))
#$(CC) $(CFLAGS) -M -MT $# -o $(patsubst %.o, %.d, $#) $<
#$(CC) $(CFLAGS) -o $# -c $<
$(BUILD)/%.moc.o: $(BUILD)/%.moc.cpp
#echo COMPILING MOC $<
#mkdir -p $(subst /,\,$(dir $#))
#$(CC) $(CFLAGS) -M -MT $# -o $(patsubst %.o, %.d, $#) $<
#$(CC) $(CFLAGS) -o $# -c $<
$(BUILD)/%.moc.cpp: %.h
#echo GENERATING MOC $<
#$(MOC) $< -o $#
-include $(OBJ:.o=.d)
.PHONY: clean
clean:
#echo CLEANING......
#rm -rf $(BUILD)/Src $(BUILD)/test.exe