makefile error lib/Scrt1.o undefined reference to `main' - c++

Question

I glanced tons of similar topic, but I couldn't recognize solution
I tried mine and many variations. Even below the simplest code compiling doesn't work. I think skipping little thing...
Could you help me?
# 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
Error message
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
#include <iostream>
#include "randomArray.h"
using namespace std;
int main(int argc, char const *argv[])
{
int *bit=randomArray(64);
for (int i = 0; i < 64; i++)
{
cout<<bit[i]<< "\n";
}
return 0;
}

Answer 1

You forgot to link in test.o:
test: randomArray.o test.o
$(CC) $(FLAGS) $(INCLUDES) randomArray.o test.o -o test
Also note that test.o: randomArray.o is probably wrong. It says test.o depends on randomArray.o, which it doesn't. It depends on test.cpp.
test.o: test.cpp
$(CC) $(FLAGS) $(INCLUDES) -c test.cpp