Roland Dreier wrote: > > > For example, before the POSIX standard, to match alphanumeric charac- > > ters, you would have had to write /[A-Za-z0-9]/. If your character set > > had other alphabetic characters in it, this would not match them, and > > if your character set collated differently from ASCII, this might not > > even match the ASCII alphanumeric characters. With the POSIX character > > classes, you can write /[[:alnum:]]/, and this matches the alphabetic > > and numeric characters in your character set, no matter what it is. > > I'm not sure I understand this, although I'm not a character set expert. > But is there really some possible locale + awk implementation where an > awk script, written in pure ASCII, operating on a pure ASCII input file, > will have [A-Za-z0-9] match a different set of ASCII characters than > [[:alnum:]] will match? I assume that in utf-8 locale(nowadays default in most of distro) alphabets may be sorted as aAbBcC...zZ(or AaBb...), and in this case a-z means aAbBcC...z. As Al Viro said, if we run awk with LC_ALL=C, then the characters will be sorted as ASCII. So, your patch is OK if you can add LC_ALL=C just before $(AWK). (I'm not so sure whether Makefile can accept it...) Thank you, -- Masami Hiramatsu Software Engineer Hitachi Computer Products (America), Inc. Software Solutions Division e-mail: mhiramat@xxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
