makefile 错误 lib/Scrt1.o 未定义对 `main' 的引用

Question

我看了很多类似的话题，但我无法识别解决方案

我尝试了我的和许多变体。即使在最简单的代码编译下也不起作用。我想跳过小东西...你能帮我吗？

    # Make file for test.c file dependencies external C libraries

    CC = g++
    C = gcc
    FLAGS = -Wextra -g
    INCLUDES = -lm

test: randomArray.o test.o
    $(CC) $(FLAGS) $(INCLUDES) randomArray.o -o test 

test.o: randomArray.o
    $(C) $(FLAGS) $(INCLUDES) -c test.cpp  

randomArray.o: randomArray.c
    $(C) $(FLAGS) $(INCLUDES) -c randomArray.c 

错误信息

make
g++ -Wextra -g -lm randomArray.o -o test 
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib/Scrt1.o: in function `_start':
(.text+0x24): undefined reference to `main'
collect2: error: ld returned 1 exit status
make: *** [makefile:9: test] Error 1

    # Make file for test.c file dependencies external C libraries

    CC = g++
    C = gcc
    FLAGS = -Wextra -g
    INCLUDES = -lm

test: randomArray.o test.o
    $(CC) $(FLAGS) $(INCLUDES) randomArray.o -o test 

test.o: randomArray.o
    $(C) $(FLAGS) $(INCLUDES) -c test.cpp  

randomArray.o: randomArray.c
    $(C) $(FLAGS) $(INCLUDES) -c randomArray.c 

Answer 1

你忘了链接test.o：

test: randomArray.o test.o
    $(CC) $(FLAGS) $(INCLUDES) randomArray.o test.o -o test 

另请注意，这test.o: randomArray.o可能是错误的。它说test.o取决于randomArray.o，它没有。这取决于test.cpp.

test.o: test.cpp
    $(CC) $(FLAGS) $(INCLUDES) -c test.cpp