[PATCH] fnmatch.h: use standard internal defines

[Zack Weinberg]

On Sun, Nov 27, 2016 at 2:04 AM, Mike Frysinger <vapier@gentoo.org> wrote:
...
> @@ -47,7 +47,7 @@ extern "C" {
>     `fnmatch'.  Since this is not the case here it will never be
>     returned but the conformance test suites still require the symbol
>     to be defined.  */
> -#ifdef _XOPEN_SOURCE
> +#ifdef __USE_XOPEN
>  # define FNM_NOSYS     (-1)
>  #endif

As long as we're touching this file,
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/fnmatch.h.html
says FNM_NOSYS was deprecated-XSI in Issue 6 and dropped in Issue 7,
which I *think* means this conditional should be

    #if defined __USE_XOPEN && !defined __USE_XOPEN2K8

(I'm not having any luck finding an online copy of Issue 4 - the Open
Group seems to believe nobody needs to look at it anymore.)

zw