if [ -z "$dirs" ]; then
    echo "usage: set dirs=<source dirs...>" >&2
    exit 99
fi

for dir in $dirs; do
    for d in $dir/*.cc; do
        [ -e "$d" ] || continue
        echo "${d%.cc}.o"
    done &&
    for d in $dir/*.c; do
        [ -e "$d" ] || continue
        echo "${d%.c}.o"
    done || break
done |
sort |
{
    if [ -n "$_WIN32" ]; then
    	redo-ifchange not-win32.list
        comm -2 -3 - not-win32.list
    else
        cat
    fi
}