Re: Bug on NetBSD : redefinition of wint_t

[Paul Eggert]

> From: Akim Demaille <address@hidden>
> Date: 06 Aug 2001 10:18:44 +0200
> 
> I'm a bit afraid to apply this patch as it might break other systems.

Likewise.

> Maybe that's something we should handle
> at configure.in's level, probably checking whether we can include
> stddef and wchar together.

How about this idea for a more general fix?  It would fix many of the
problems that we run into in this area:

1.  Modify AC_CHECK_HEADER to always try to compile the header; it
    should never merely just try to preprocess it.

    If a header preprocesses correctly, but does not compile
    correctly, nobody really wants to use it.  So as far as I can see,
    the current behavior if AC_CHECK_HEADER is not something that
    anybody really wants.

2.  Modify AC_CHECK_HEADER to use the default includes if INCLUDES is
    empty, just as the other check macros do.

The idea is to fix autoconf without requiring any fixes to other packages.