Found the cause! (Was: Re: recent emacs 27.0.50 prevent gnuplot's compilation)

[Masaru Nomiya <nomiya@galaxy.dti.ne.jp>]

Hello,

In the Message; 

  Subject    : recent emacs 27.0.50 prevent gnuplot's compilation
  Message-ID : <87pnvp39vd.wl-nomiya@galaxy.dti.ne.jp>
  Date & Time: Thu, 01 Nov 2018 09:43:50 +0900

Masaru Nomiya <nomiya@galaxy.dti.ne.jp> has written:

>  Hello,

>  I tried to compile gnuplot gnuplot-5.2.5-113.6.src.rpm, but it failed
>  with the very latest emacs. The error msassege is as follows;

>  [...]
>  Unknown commands: newread gpVersion includegraphics closein href error GpVersion hypersetup undefined chead rhead openin read fileGpVersion fi hyperlink ifeof ifxL parpic adjustarticle leftmark cfoot else lhead hypertarget
>  [...]

>  I tried to compile with the revision 8fffac14b19d375f774b835ea33ef8989300125d
>  emacs, I could compile gnuplot.

>  In this case, above message changed;

>  [...]
>  Unknown commands: fileGpVersion adjustarticle read hypersetup error rhead chead fi ifeof else hypertarget gpVersion href lhead openin GpVersion cfoot hyperlink closein parpic undefined ifxL newread leftmark includegraphics
>  [...]

My problem was caused by;

commit 3dd16a89bf410d77e9ddc41cbfbbd4b343928d6d
Author: Juri Linkov <juri@linkov.net>
Date:   Sat Oct 27 23:27:54 2018 +0300

    * lisp/isearch.el (lazy-highlight-buffer): New defcustom.  (Bug#29360)
    
    (lazy-highlight-buffer-max-at-a-time): New defcustom.
    (isearch-lazy-highlight-buffer): New defvar.
    (isearch-lazy-highlight-new-loop): Don't check changes in window
    boundaries when lazy-highlight-buffer is non-nil.
    Move code that extends start/end to match whole string at point
    here from isearch-lazy-highlight-search.
    (isearch-lazy-highlight-search): Add args string and bound
    like in other search functions.  Move calculation of bound
    to isearch-lazy-highlight-update.
    (isearch-lazy-highlight-match): New function with code extracted from
    isearch-lazy-highlight-update to be called also from
    isearch-lazy-highlight-buffer-update.
    (isearch-lazy-highlight-update): Reuse the values returned from
    window-group-start and window-group-end.  At the end schedule the
    timer to call isearch-lazy-highlight-buffer-update when
    isearch-lazy-highlight-buffer is non-nil.
    (isearch-lazy-highlight-buffer-update): New function.


That is , revert iserch.el to previous one, solved my problem.

Thanks,

---
 Masaru Nomiya             mail-to: nomiya @ galaxy.dti.ne.jp