prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -std=c++11 -o main.o -c main.cpp 
main.cpp: In function 'int main(int, char**)':
main.cpp:86:23: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
     char *optstring = "vmptg:";
                       ^~~~~~~~
main.cpp:84:9: warning: unused variable 'digit_optind' [-Wunused-variable]
     int digit_optind = 0;
         ^~~~~~~~~~~~
main.cpp:134:46: warning: unused variable 'numElts' [-Wunused-variable]
     int timestamp,quantity,price,duration,bs,numElts;
                                              ^~~~~~~
g++ -g -Wall -O2 -std=c++11 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully