GNU bug report logs - #13445
add2rline usage in manual

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Message #3 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: submit <at> debbugs.gnu.org
Subject: add2rline usage in manual
Date: Mon, 14 Jan 2013 19:09:09 -0500

Package: emacs
Version: 24.2.92
Severity: minor

trouble.texi says:

  If your system has the @command{addr2line} utility, the following shell
  command outputs a backtrace with source-code line numbers:

  @example
  sed -n 's/.*\[\(.*\)]$/\1/p' @var{backtrace} |
    addr2line -Cfip -e @var{bindir}/emacs
  @end example


Trying this on RHEL6 fails with:

   addr2line: invalid option -- 'p'

By experiment, -Cfi works.

I can't see anywhere in the addr2line manual or info page on this system
that explains what demangling styles are valid.


GNU addr2line version 2.20.51.0.2-5.34.el6 20100205

Message #6 received at 13445 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 13445 <at> debbugs.gnu.org
Subject: Re: bug#13445: add2rline usage in manual
Date: Tue, 15 Jan 2013 09:58:00 +0100

Glenn Morris <rgm <at> gnu.org> writes:

> Trying this on RHEL6 fails with:
>
>    addr2line: invalid option -- 'p'

-p (aka --pretty-print) has been added in binutils 2.21.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #11 received at 13445 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: 13445 <at> debbugs.gnu.org
Subject: Re: bug#13445: add2rline usage in manual
Date: Sat, 19 Jan 2013 14:16:40 -0800

With newer addr2line, -p is helpful because function names
aren't printed without it.  In trunk bzr 111564..5 I pushed the
following, to suggest -p if available and to say what to do with
older addr2line implementations.

=== modified file 'doc/emacs/ChangeLog'
--- doc/emacs/ChangeLog	2013-01-19 20:38:13 +0000
+++ doc/emacs/ChangeLog	2013-01-19 22:10:50 +0000
@@ -1,3 +1,10 @@
+2013-01-19  Paul Eggert  <eggert <at> cs.ucla.edu>
+
+	* trouble.texi (Crashing): Suggest -p for recent addrline.  (Bug#13445)
+	Without it, I don't see function names.  Older addrlines will die
+	out sooner or later, so tailor the suggestion to recent addrline
+	and put in a comment about older ones.
+
 2013-01-19  Glenn Morris  <rgm <at> gnu.org>
 
 	* custom.texi (Directory Variables): Fix paren typo.

=== modified file 'doc/emacs/trouble.texi'
--- doc/emacs/trouble.texi	2013-01-19 20:38:13 +0000
+++ doc/emacs/trouble.texi	2013-01-19 22:14:42 +0000
@@ -325,7 +325,8 @@
 
 @example
 sed -n 's/.*\[\(.*\)]$/\1/p' @var{backtrace} |
-  addr2line -C -f -i -e @var{bindir}/@var{emacs-binary}
+  addr2line -C -f -i -p -e @var{bindir}/@var{emacs-binary}
+# Omit '-p' for binutils 2.20 and earlier.
 @end example
 
 @noindent

Message #14 received at 13445 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 13445 <at> debbugs.gnu.org
Subject: Re: bug#13445: add2rline usage in manual
Date: Sat, 19 Jan 2013 17:34:44 -0500

Paul Eggert wrote:

> With newer addr2line, -p is helpful because function names
> aren't printed without it.  In trunk bzr 111564..5 I pushed the
> following, to suggest -p if available and to say what to do with
> older addr2line implementations.

This doesn't really make sense, given the changes I had already made.
(See the footnote.)

Message #17 received at 13445 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 13445 <at> debbugs.gnu.org
Subject: Re: bug#13445: add2rline usage in manual
Date: Sat, 19 Jan 2013 14:50:28 -0800

On 01/19/2013 02:34 PM, Glenn Morris wrote:
> This doesn't really make sense, given the changes I had already made.
> (See the footnote.)

Sorry, that was my problem -- I didn't see the footnote.  (Do people
read footnotes?...)  I tried to fix things by pulling that material
out of the footnote and suggesting -p first with a fallback without -p,
in trunk bzr 111567.

Message #20 received at 13445 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 13445 <at> debbugs.gnu.org
Subject: Re: bug#13445: add2rline usage in manual
Date: Sat, 19 Jan 2013 18:40:39 -0500

Paul Eggert wrote:

> Sorry, that was my problem -- I didn't see the footnote.  (Do people
> read footnotes?...)

I think you answered your own question. :)

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