Recommended -W flags for building C++ with gcc

Don't forget -Wstrict-aliasing.

I found this post was good, look the params up: Recommended gcc warning options for C

-Wall -Wextra tends to cover the really noteworthy ones. Personally, I also like to compile with -ansi -pedantic and occasionally -Wshadow.

Also, it can be a little noisy and not useful 100% of the time, but -Weffc++ sometimes has good suggestions for better code quality as well.

EDIT In the age of modern C++, you should replace -ansi -pedantic with -std=c++14 -pedantic or whatever your version of choice is, since -ansi will put the compiler into C++98/C++-03 mode.