Re: Support XDG base directory for gnuplotrc

On Wednesday, 29 January 2020 20:23:28 PST Henri Menke wrote:
> Dear list,
> 
> In merge request #12 I propose the addition of the XDG base directory
> specification for configuration file paths.
> 
>     https://sourceforge.net/p/gnuplot/gnuplot-main/merge-requests/12/
> 
> There is already some discussion on the ticket.  It seems that the
> overall opinion is in favor of this addition.  Is this correct?  If that
> is the case, could you please review the code?  After that I will write
> some words in the docs and we should be good to go.

I notice that the filename is generated by a call to wordexp().
This is in POSIX-2001 but is not in the c99 standard, right?
The gnu docs say
  "This function is missing on some platforms: Mac OS X 10.3, OpenBSD 3.8,
  Minix 3.1.8, IRIX 5.3, Cygwin 1.5.x, mingw, MSVC 14, Interix 3.5, BeOS,
  Android 9.0."

We have just barely got the gnuplot code base up to c99, so anything
beyond that should be protected by a feature test.  Is there an
autoconf macro for this?

If the purpose is just to handle tilde expansion, can this dependence
be removed by replacing it with a call to gp_expand_tilde()?

	Ethan