prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp 
main.cpp: In function 'int main(int, char**)':
main.cpp:118:24: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
       char *opstring = "vmptg:";
                        ^~~~~~~~
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully