all: measurement-O0 measurement-O1 measurement-O2 measurement-O3 measurement-O0: measurement.cc Makefile g++ -O0 -Wall -Werror -Wextra -Wconversion -std=c++20 measurement.cc -o measurement-O0 measurement-O1: measurement.cc Makefile g++ -O1 -Wall -Werror -Wextra -Wconversion -std=c++20 measurement.cc -o measurement-O1 measurement-O2: measurement.cc Makefile g++ -O2 -Wall -Werror -Wextra -Wconversion -std=c++20 measurement.cc -o measurement-O2 measurement-O3: measurement.cc Makefile g++ -O3 -Wall -Werror -Wextra -Wconversion -std=c++20 measurement.cc -o measurement-O3