[SCM] GNU Autoconf source repository branch, master, updated. v2.68-26-g73c280a

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- Log -----------------------------------------------------------------
commit 73c280a8255d38b5bd4f8819b91c19730fefed25
Author: Ralf Wildenhues <[email protected]>
Date:   Sat Jan 22 13:46:06 2011 +0100

    docs: do not use AIX 5.3 cp -R.
    
    * doc/autoconf.texi (Limitations of Usual Tools): Document one
    instance of the cp -R bug on AIX 5.3.  This seems to have been
    fixed in 6.1 and newer releases.
    
    Signed-off-by: Ralf Wildenhues <[email protected]>

commit f27287014003d7cbcac13f4da263066b86398908
Author: Ralf Wildenhues <[email protected]>
Date:   Sat Jan 22 09:28:44 2011 +0100

    docs: update entry about unset.
    
    * doc/autoconf.texi (Limitations of Builtins): NetBSD sh unset
    also fails upon `unset' of a variable that is not set.  Bash 2.01
    could also dump core over `unset MAILPATH'.
    Suggestion by Eric Blake.
    
    Signed-off-by: Ralf Wildenhues <[email protected]>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog         |   13 +++++++++++++
 doc/autoconf.texi |   21 ++++++++++++++++-----
 2 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 13594f1..c4c2bc1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2011-01-22  Ralf Wildenhues  <[email protected]>
+
+	docs: do not use AIX 5.3 cp -R.
+	* doc/autoconf.texi (Limitations of Usual Tools): Document one
+	instance of the cp -R bug on AIX 5.3.  This seems to have been
+	fixed in 6.1 and newer releases.
+
+	docs: update entry about unset.
+	* doc/autoconf.texi (Limitations of Builtins): NetBSD sh unset
+	also fails upon `unset' of a variable that is not set.  Bash 2.01
+	could also dump core over `unset MAILPATH'.
+	Suggestion by Eric Blake.
+
 2011-01-21  Ralf Wildenhues  <[email protected]>
 
 	Fix LEXLIB and YYTEXT_POINTER with IRIX 6.5 flex 2.5.4.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 4cb3a8c..b1496c6 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -17758,13 +17758,15 @@ and file name expansion.
 @item @command{unset}
 @c ------------------
 @prindex @command{unset}
-In some nonconforming shells (e.g., Bash 2.05a), @code{unset FOO} fails
-when @code{FOO} is not set.  You can use
+In some nonconforming shells (e.g., NetBSD 5.99.43 sh or Bash 2.05a),
+@code{unset FOO} fails when @code{FOO} is not set.  This can interfere
+with @code{set -e} operation.  You can use
 
 @smallexample
 FOO=; unset FOO
 @end smallexample
 
+@noindent
 if you are not sure that @code{FOO} is set.
 
 A few ancient shells lack @command{unset} entirely.  For some variables
@@ -17777,8 +17779,8 @@ PS1='$ '
 Usually, shells that do not support @command{unset} need less effort to
 make the environment sane, so for example is not a problem if you cannot
 unset @command{CDPATH} on those shells.  However, Bash 2.01 mishandles
-@code{unset MAIL} in some cases and dumps core.  So, you should do
-something like
+@code{unset MAIL} and @code{unset MAILPATH} in some cases and dumps core.
+So, you should do something like
 
 @smallexample
 ( (unset MAIL) || exit 1) >/dev/null 2>&1 && unset MAIL || :
@@ -18065,7 +18067,16 @@ Avoid the @option{-r} option, since Posix 1003.1-2004 marks it as
 obsolescent and its behavior on special files is implementation-defined.
 Use @option{-R} instead.  On GNU hosts the two options
 are equivalent, but on Solaris hosts (for example) @code{cp -r}
-reads from pipes instead of replicating them.
+reads from pipes instead of replicating them.  AIX 5.3 @code{cp -R} may
+corrupt its own memory with some directory hierarchies and error out or
+dump core:
+
+@example
+@kbd{mkdir -p 12345678/12345678/12345678/12345678}
+@kbd{touch 12345678/12345678/x}
+@kbd{cp -R 12345678 t}
+cp: 0653-440 12345678/12345678/: name too long.
+@end example
 
 Some @command{cp} implementations (e.g., BSD/OS 4.2) do not allow
 trailing slashes at the end of nonexistent destination directories.  To


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