This is a re-emergence of bug 2223 filed against 23.0.91 and (ISTR)
subsequently fixed.

You will need a Makefile that is going to output a long line.  This
works for me:

all:
	@echo the 2+K char very long line copied from my real makefile

Now emacs -Q and eval in *scratch*

(setq compilation-scroll-output t)
(setq special-display-frame-alist nil)
(setq compile-frame-alist
      (append '((width . 150) (height . 15))
	      '((left . 25) (top . 75))
	      '((menu-bar-lines . 1))
	      special-display-frame-alist))
(setq special-display-buffer-names
      (list (cons "*compilation*" compile-frame-alist)))

Now do Tools > Compile... RET and I see Emacs create the *compilation*
window frame and insert chunks of the echo output before eventually not
scrolling the *compilation* window.  It doesn't stop scrolling at the
same time with each recompile.

Simon.

In GNU Emacs 23.1.92.1 (sparc-sun-solaris2.8, Motif Version 2.1.0)
 of 2010-02-01 on risksun2
Windowing system distributor `Hummingbird Ltd.', version 11.0.100015
configured using `configure  '--without-makeinfo'
'--x-includes=/usr/openwin/include:/usr/dt/include:/usr/local/include:/u
sr/local/X11/include'
'--x-libraries=/usr/openwin/lib:/usr/dt/lib:/usr/local/lib:/usr/local/X1
1/lib' '--with-x-toolkit=motif' '--with-jpeg=no' '--with-gif=no'
'--with-tiff=no''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t



"Misys" is the trade name for Misys plc (registered in England and Wales). Registration Number: 01360027. Registered office: One Kingdom Street, London W2 6BL, United Kingdom. For a list of Misys group operating companies please go to http://www.misys.com/corp/About_Us/misys_operating_companies.html. This email and any attachments have been scanned for known viruses using multiple scanners. This email message is intended for the named recipient only. It may be privileged and/or confidential. If you are not the named recipient of this email please notify us immediately and do not copy it or use it for any purpose, nor disclose its contents to any other person. This email does not constitute the commencement of legal relations between you and Misys plc. Please refer to the executed contract between you and the relevant member of the Misys group for the identity of the contracting party with which you are dealing.