Hello I noticed g++ ignores -W as I understand it that alone doesn't turn anything on? https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html Also may I ask if specifying both -pedantic -Wpedantic be an error? They are the same as I understand. g++ doesn't reject them both being specified. Another example is -O1 -O0 -O3, the later -03 seems to be used. Maybe nice to say too many optimization options specified? Cheers, Jonny
