项目编译时出现位置代码问题

# Project: main
# Makefile created by Dev-C++ 5.11

CPP      = g++.exe -D__DEBUG__
CC       = gcc.exe -D__DEBUG__
WINDRES  = windres.exe
OBJ      = main.o main.o max.o
LINKOBJ  = main.o main.o max.o
LIBS     = -L"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib" -L"C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/lib" -static-libgcc -g3
INCS     = -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.8.1/include"
CXXINCS  = -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/x86_64-w64-mingw32/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.8.1/include" -I"C:/Program Files (x86)/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.8.1/include/c++"
BIN      = main.exe
CXXFLAGS = $(CXXINCS) -g3
CFLAGS   = $(INCS) -g3
RM       = rm.exe -f

.PHONY: all all-before all-after clean clean-custom

all: all-before $(BIN) all-after

clean: clean-custom
    ${RM} $(OBJ) $(BIN)

$(BIN): $(OBJ)
    $(CC) $(LINKOBJ) -o $(BIN) $(LIBS)

main.o: main.c
    $(CC) -c main.c -o main.o $(CFLAGS)

main.o: main.c
    $(CC) -c main.c -o main.o $(CFLAGS)

max.o: max.c
    $(CC) -c max.c -o max.o $(CFLAGS)

这个代码是什么东西啊？创建了一个项目自动跑出这么一个东西

定义了多个main，其中一个改名吧