Re: expect/configure.in patch for NSIG

[Andrew Cagney <ac131313@cygnus.com>]

No one as said anything so I'm checking this in.  The original 
discussion leading up to this occured on the gdb list.

	Andrew


> expect/ChangeLog entry
> 2001-04-24  Rodney Brown  <RDBrown@mira.net>
> 
> * configure.in: Only define _XOPEN_SOURCE if NSIG remains defined.
> 
> --- expect/configure.in.orig	Thu Jun 22 12:21:48 2000
> +++ expect/configure.in	Tue Apr 24 11:07:55 2001
> @@ -854,7 +854,19 @@
>    # On some systems (e.g., IA-64 Linux), we need to define _XOPEN_SOURCE
>    # in order to get a declaration for ptsname.  It is safe to simply
>    # define that whenever we are using ptsname.
> -  AC_DEFINE(_XOPEN_SOURCE)
> +  AC_MSG_CHECKING([for NSIG definition with _XOPEN_SOURCE])
> +  AC_TRY_COMPILE([
> +/* _XOPEN_SOURCE can remove NSIG on UnixWare or OSF/1. */
> +#define _XOPEN_SOURCE
> +#include <signal.h>
> +char junk[NSIG];],
> +    [],
> +	AC_DEFINE(_XOPEN_SOURCE)
> +	AC_MSG_RESULT(yes)
> +    ,
> +	AC_MSG_RESULT(no)
> +    ,
> +  )
>    # END CYGNUS LOCAL
>  else
>    AC_MSG_RESULT(no)