[Rd] R on AIX

[Kurt Hornik]

Two issues re R on AIX that came up in recent email exchange with Dan
Million <lio@hpss1.ccs.ornl.gov>:

* We currently use the Autoconf AC_AIX macro which essentially 'defines'
  _ALL_SOURCE on AIX.  According to Dan, on AIX one ends up with

	#define _ALL_SOURCE 1

  which follows Autoconf's general pattern, but causes a problem as the
  system headers (unconditionally?) have

	#define _ALL_SOURCE

  which gives a redefinition error.  Now the Autoconf source has

	AC_DEFUN([AC_AIX],
	[AH_VERBATIM([_ALL_SOURCE],
	[/* Define to 1 if on AIX 3.
	   System headers sometimes define this.
	   We just want to avoid a redefinition error message.  */

  etc ... noting the 'AIX 3' part, I am wondering if we need the macro
  at all.  Does anyone know?

* Dan also pointed me to 'run-time linking' vs the usual AIX style
  linking.  Using run-time linking one could simply do

       MAIN_LDFLAGS=-brtl
       SHLIB_LDFLAGS="-G"

  instead of the complicated import/export handling with AIX linking,
  and apparently also no longer need an export file?

  Dan says that run-time linking is available in AIX 4.2 or better, does
  anyone know more about this?  Should it perhaps be made the default if
  available?

Note that I have no access to AIX, hence need help ...

-k
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