RS6000 buried treasure - NO_IMPLICIT_EXTERN_C

[Zack Weinberg]

On Fri, Nov 08, 2002 at 10:56:24AM -0500, David Edelsohn wrote:
> >
> > I am inclined to enable NO_IMPLICIT_EXTERN_C for the entire directory,
> > in rs6000.h.  What few targets this is inappropriate for -- I'm
> > willing to bet that's either none, or only AIX 3.1 -- can #undef it
> > again.
> >
> > Comments?
> 
> 	I could see placing this in sysv4.h, but not rs6000.h.  I do not
> believe that GCC's fixincludes completely addresses the C++ issues in the
> AIX header files.  IBM Visual Age C++ distributes its own system header
> files.

Defining or not defining NO_IMPLICIT_EXTERN_C addresses only one C++
issue with system headers.  It should be defined by all targets where
the system headers already wrap declarations in extern "C" { ... }
when appropriate, and not defined otherwise.  Is it really the case
that no AIX release provides extern "C" markers?

zw