GNU bug report logs - #5706
23.1; Comments incorrectly detected in autoconf mode

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Package: emacs; Severity: minor; Reported by: rrt@HIDDEN; Keywords: confirmed; dated Thu, 11 Mar 2010 15:35:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Added tag(s) confirmed. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#5706: 23.1; Comments incorrectly detected in autoconf mode
To: Reuben Thomas <rrt@HIDDEN>
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tags 5706 + confirmed
thanks

Reuben Thomas <rrt@HIDDEN> writes:

> On Thu, 19 Nov 2020 at 03:12, Stefan Kangas <stefan@HIDDEN> wrote:
>
>> rrt@HIDDEN writes:
>>
>> > A hash character does not always introduce a comment in autoconf code,
>> > but autoconf-mode always colors if as if it did. Unfortunately, I
>> > cannot really tell from the autoconf manual what the rules are. I
>> > suspect that # does not start a comment if it is inside [...] quotes,
>> > but I guess this should be checked.
>>
>> (This bug was reported 10 years ago, but unfortunately never got a reply
>> at the time.)
>>
>> Could you give an example of some autoconf code where you believe the
>> hash character is incorrectly identified as a comment?
>>
>
> A quick bit of grepping finds the in XEmacs's configure.ac. Note in
> particular the contents of the first argument to AC_LANG_PROGRAM:
>
> AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <features.h>],[
> #if ! (defined __GLIBC__ || defined __GNU_LIBRARY__)
> #error Not a GNU libc system :-(
> ******* ======= ******** &&&&&&&&
> #endif
> ])], have_glibc=yes, have_glibc=no)

Thanks.  I see the same on current master using the configure.ac from
Emacs.

It incorrectly uses `font-lock-comment-face' for the entire line after
"langinfo.h" below:

AC_CACHE_CHECK([for nl_langinfo and CODESET], [emacs_cv_langinfo_codeset],
  [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <langinfo.h>]],




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#5706; Package emacs. Full text available.

Message received at 5706 <at> debbugs.gnu.org:


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Subject: Re: bug#5706: 23.1; Comments incorrectly detected in autoconf mode
To: Stefan Kangas <stefan@HIDDEN>
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--0000000000009cbf1305b470cc22
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On Thu, 19 Nov 2020 at 03:12, Stefan Kangas <stefan@HIDDEN> wrote:

> rrt@HIDDEN writes:
>
> > A hash character does not always introduce a comment in autoconf code,
> > but autoconf-mode always colors if as if it did. Unfortunately, I
> > cannot really tell from the autoconf manual what the rules are. I
> > suspect that # does not start a comment if it is inside [...] quotes,
> > but I guess this should be checked.
>
> (This bug was reported 10 years ago, but unfortunately never got a reply
> at the time.)
>
> Could you give an example of some autoconf code where you believe the
> hash character is incorrectly identified as a comment?
>

A quick bit of grepping finds the in XEmacs's configure.ac. Note in
particular the contents of the first argument to AC_LANG_PROGRAM:

AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <features.h>],[
#if ! (defined __GLIBC__ || defined __GNU_LIBRARY__)
#error Not a GNU libc system :-(
******* ======= ******** &&&&&&&&
#endif
])], have_glibc=yes, have_glibc=no)

-- 
https://rrt.sc3d.org

--0000000000009cbf1305b470cc22
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<div dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail=
_attr">On Thu, 19 Nov 2020 at 03:12, Stefan Kangas &lt;<a href=3D"mailto:st=
efan@HIDDEN">stefan@HIDDEN</a>&gt; wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex"><a href=3D"mailto:rrt@HIDDEN" target=3D=
"_blank">rrt@HIDDEN</a> writes:<br>
<br>
&gt; A hash character does not always introduce a comment in autoconf code,=
<br>
&gt; but autoconf-mode always colors if as if it did. Unfortunately, I<br>
&gt; cannot really tell from the autoconf manual what the rules are. I<br>
&gt; suspect that # does not start a comment if it is inside [...] quotes,<=
br>
&gt; but I guess this should be checked.<br>
<br>
(This bug was reported 10 years ago, but unfortunately never got a reply<br=
>
at the time.)<br>
<br>
Could you give an example of some autoconf code where you believe the<br>
hash character is incorrectly identified as a comment?<br>
</blockquote></div><div><br></div><div><div style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small" class=3D"gmail_default">A quick bit of gr=
epping finds the in XEmacs&#39;s <a href=3D"http://configure.ac">configure.=
ac</a>. Note in particular the contents of the first argument to AC_LANG_PR=
OGRAM:<br></div></div><div><br></div><div>AC_COMPILE_IFELSE([AC_LANG_PROGRA=
M([#include &lt;features.h&gt;],[<br>#if ! (defined __GLIBC__ || defined __=
GNU_LIBRARY__)<br>#error Not a GNU libc system :-(<br>******* =3D=3D=3D=3D=
=3D=3D=3D ******** &amp;&amp;&amp;&amp;&amp;&amp;&amp;&amp;<br>#endif<br>])=
], have_glibc=3Dyes, have_glibc=3Dno)<br></div><div><br></div>-- <br><div d=
ir=3D"ltr" class=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"=
><a href=3D"https://rrt.sc3d.org" target=3D"_blank">https://rrt.sc3d.org</a=
></div></div></div></div></div>

--0000000000009cbf1305b470cc22--




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#5706; Package emacs. Full text available.

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Subject: Re: bug#5706: 23.1; Comments incorrectly detected in autoconf mode
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rrt@HIDDEN writes:

> A hash character does not always introduce a comment in autoconf code,
> but autoconf-mode always colors if as if it did. Unfortunately, I
> cannot really tell from the autoconf manual what the rules are. I
> suspect that # does not start a comment if it is inside [...] quotes,
> but I guess this should be checked.

(This bug was reported 10 years ago, but unfortunately never got a reply
at the time.)

Could you give an example of some autoconf code where you believe the
hash character is incorrectly identified as a comment?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#5706; Package emacs. Full text available.

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To: bug-gnu-emacs@HIDDEN
Subject: 23.1; Comments incorrectly detected in autoconf mode
Date: Thu, 11 Mar 2010 15:34:20 -0000
From: rrt@HIDDEN
Message-Id: <1268321660.243500.25019@canta>
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A hash character does not always introduce a comment in autoconf code,
but autoconf-mode always colors if as if it did. Unfortunately, I
cannot really tell from the autoconf manual what the rules are. I
suspect that # does not start a comment if it is inside [...] quotes,
but I guess this should be checked.


In GNU Emacs 23.1.1 (i486-pc-linux-gnu, GTK+ Version 2.18.3)
 of 2009-11-10 on vernadsky, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10604000
configured using `configure  '--build=i486-linux-gnu' '--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.1/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''

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: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Autoconf

Minor modes in effect:
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  show-paren-mode: t
  savehist-mode: t
  minibuffer-electric-default-mode: t
  iswitchb-mode: t
  icomplete-mode: t
  global-auto-revert-mode: t
  desktop-save-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-s p c r e _ m a k e C-a C-p C-p C-p C-p C-p C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-x b <return> <backspace> 
C-x C-s <right> <right> <right> <right> <right> <down> 
<down> <down> <down> <left> <up> <up> <up> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <right> 
<right> <return> SPC SPC <down> <down> <down> <right> 
<right> <right> <down> <right> <left> ] <right> <backspace> 
C-/ <left> <backspace> ) ] <right> C-x C-s <up> <up> 
<up> <up> <up> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <down> <left> <left> <left> 
<left> <left> <left> <right> <right> <right> <left> 
<right> <right> <right> <right> <left> <right> <down> 
<down> <down> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <down> <left> <left> <left> <right> 
<left> <right> <left> <up> <up> <up> <up> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <down> <down> <down> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <down> <left> 
<right> <right> <down> <left> <left> <left> <left> 
<left> <left> <right> <right> <right> <right> <right> 
<right> <left> <left> <left> <left> <left> <backspace> 
<backspace> C-x C-s M-x r e p o r t b <backspace> = 
<backspace> - - <backspace> e m a c s - b u g <ret
urn>

Recent messages:
Mark saved where search started [2 times]
Saving file /home/rrt/repo/grep-dlopen-pcre/configure.ac...
Wrote /home/rrt/repo/grep-dlopen-pcre/configure.ac
Auto-saving...done
Undo!
Saving file /home/rrt/repo/grep-dlopen-pcre/configure.ac...
Wrote /home/rrt/repo/grep-dlopen-pcre/configure.ac
Saving file /home/rrt/repo/grep-dlopen-pcre/configure.ac...
Wrote /home/rrt/repo/grep-dlopen-pcre/configure.ac
Reverting buffer `configure'.





Acknowledgement sent to rrt@HIDDEN:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#5706; Package emacs. Full text available.
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