warning flags code example

Example: warning flags

# CC=gcc 
CC=clang++

$ clang++ file1.cpp file2.cpp file3.cpp \
  -std=c++14  -o app.bin -O3 -g \
  -Wall -Wextra -pendantic \
  -lpthread -lblas -lboost_system -lboost_filesystem \
  -I./include/path1/with/headers1 -I./include2 -L./path/lib1 -L./pathLib2