manywarnings: update the list of "all" warnings * m4/manywarnings.m4: Unite lists, and add many new options. * build-aux/gcc-warning: New file. Run this command with the latest gcc to see if they have added options not yet on our list: gl=.; comm -1 -3 \ <(sed -n 's/^ *\(-[^ ]*\) .*/\1/p' $gl/m4/manywarnings.m4 |sort) \ <(gcc --help=warnings|sed -n 's/^ \(-[^ ]*\) .*/\1/p' |sort \ |grep -v --line-regexp -f <(cut -f1 $gl/build-aux/gcc-warning.spec))