* trouble.texi (Crashing): Suggest -p for recent addrline.

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.

Fixes: debbugs:13445

2 files changed, 9 insertions, 1 deletions

diff --git a/doc/emacs/ChangeLog b/doc/emacs/ChangeLog
index 6e4c9fbc65b..a3725185ac2 100644
--- a/doc/emacs/ChangeLog
+++ b/doc/emacs/ChangeLog
@@ -1,3 +1,10 @@
+2013-01-19  Paul Eggert  <eggert@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@gnu.org>
 
         * custom.texi (Directory Variables): Fix paren typo.
diff --git a/doc/emacs/trouble.texi b/doc/emacs/trouble.texi
index 21ac6af28da..e691c5a0703 100644
--- a/doc/emacs/trouble.texi
+++ b/doc/emacs/trouble.texi
@@ -325,7 +325,8 @@ backtrace with source-code line numbers:
 
 @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 addrline 2.20 and earlier.
 @end example
 
 @noindent