makefile 文件如下，求大佬帮忙：
# Project: 项目1
# Makefile created by Dev-C++ 5.11

CPP      = g++.exe
CC       = gcc.exe
WINDRES  = windres.exe
OBJ      = reservation.o input.o file.o sort.o search.o cancle.o modify.o count.o Exit.o yes_or_no.o read_line.o find_number.o code.o
LINKOBJ  = reservation.o input.o file.o sort.o search.o cancle.o modify.o count.o Exit.o yes_or_no.o read_line.o find_number.o code.o
LIBS     = -L"G:/Dev-Cpp/MinGW64/lib" -L"G:/Dev-Cpp/MinGW64/x86_64-w64-mingw32/lib" -static-libgcc -mwindows
INCS     = -I"G:/Dev-Cpp/MinGW64/include" -I"G:/Dev-Cpp/MinGW64/x86_64-w64-mingw32/include" -I"G:/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.9.2/include"
CXXINCS  = -I"G:/Dev-Cpp/MinGW64/include" -I"G:/Dev-Cpp/MinGW64/x86_64-w64-mingw32/include" -I"G:/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.9.2/include" -I"G:/Dev-Cpp/MinGW64/lib/gcc/x86_64-w64-mingw32/4.9.2/include/c++"
BIN      = 项目1.exe
CXXFLAGS = $(CXXINCS)
CFLAGS   = $(INCS)
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)

[color=#999966]$(BIN): $(OBJ)
    $(CPP) $(LINKOBJ) -o $(BIN) $(LIBS)[/color]

reservation.o: reservation.c
    $(CPP) -c reservation.c -o reservation.o $(CXXFLAGS)

input.o: input.c
    $(CPP) -c input.c -o input.o $(CXXFLAGS)

file.o: file.c
    $(CPP) -c file.c -o file.o $(CXXFLAGS)

sort.o: sort.c
    $(CPP) -c sort.c -o sort.o $(CXXFLAGS)

search.o: search.c
    $(CPP) -c search.c -o search.o $(CXXFLAGS)

cancle.o: cancle.c
    $(CPP) -c cancle.c -o cancle.o $(CXXFLAGS)

modify.o: modify.c
    $(CPP) -c modify.c -o modify.o $(CXXFLAGS)

count.o: count.c
    $(CPP) -c count.c -o count.o $(CXXFLAGS)

Exit.o: Exit.c
    $(CPP) -c Exit.c -o Exit.o $(CXXFLAGS)

yes_or_no.o: yes_or_no.c
    $(CPP) -c yes_or_no.c -o yes_or_no.o $(CXXFLAGS)

read_line.o: read_line.c
    $(CPP) -c read_line.c -o read_line.o $(CXXFLAGS)

find_number.o: find_number.c
    $(CPP) -c find_number.c -o find_number.o $(CXXFLAGS)

code.o: code.c
    $(CPP) -c code.c -o code.o $(CXXFLAGS)

报错信息：
[Error] ld returned 1 exit status
recipe for target '项目1.exe' failed（报错的那一行我重点标出了）

不要头痛医头脚痛医脚
要从系统的高度看问题
DEV生成的Makefile没有看的必要，问题不在这里面

出问题不是代码的问题就是系统环境的问题
你可以把所有源文件扩展名改为cpp试试？