Re: wchar.h

[Bruno Haible]

Eric Blake wrote:
> > and, perhaps, on whichever OS/X it is that needs the "runetype.h"
> 
> > The bottom line is that there really is some flavor of OS/X that
> > has this pre-include of "runetype.h" requirement out there somewhere.
> 
> Is this patch okay to apply so that the existing wchar module does just
> that?  However, before I apply it, I would like to ascertain exactly which
> version has this bug, so we can better document it.
> 
> 2007-02-25  Eric Blake  <address@hidden>
> 
>       * m4/wchar.m4 (gl_WCHAR_H): Check for runetype.h.
>       * lib/wchar_.h [HAVE_RUNETYPE_H]: Include it when needed for Mac
>       OS/X.

Before you apply this patch, I would also like to know what precisely
goes wrong on this version of MacOS X. Currently, all we have is hearsay:
  - On one hand, the snprintfv code from 2004 suggesting that MacOS X <wchar.h>
    exists but needs <runetype.h>,
  - On the other hand, I remember that on MacOS X 10.2 autoconf recognized
    <wchar.h> as absent - but I don't remember whether I found it actually
    missing in /usr/include/.
  - In source code of MacOS X from http://www.opensource.apple.com/darwinsource/
    (take the 'Libc' packages) you see that MacOS X 10.0.4, 10.1.5, 10.2.8
    did not have a <wchar.h> but that MacOS X 10.3 has a <wchar.h> that
    appears to be missing nothing when compared to <runetype.h>.

Bruno