Eli Zaretskii wrote:
> Which to me sounds like lib/limits.h is not a good place to define
> these constants, or at least Emacs shouldn't rely on Gnulib's limits.h
> to do its magic on all systems.

The ISO technical spec says the settings should go into <limits.h>, and if we 
put them somewhere else that will just make things more confusing in the long run.

I installed the attached patch, which should fix the immediate problem.

The fundamental problem here is that Emacs <config.h> over the years has bloated 
to contain many things that it should not. <config.h> should always be included 
first -- this is a key assumption of Autoconf and Gnulib -- and should contain 
only stuff that can appear in an included-first file. It should therefore not 
contain things like "#include <stdlib.h>" that can cause trouble in the cases 
we're talking about.

It's understandable why config.h has bloated, as it's a convenient catchall for 
stuff that has to be visible "everywhare" at the C level. The 
visibility-"everywhere" problem needs to be addressed in some other way, that's 
all. I'll look into fixing this.