Re: tests: work around Tru64 sh -e issues for instspc*.test.

[Ralf Wildenhues]

[ dropping automake-patches ]

* Eric Blake wrote on Thu, Jan 20, 2011 at 10:16:22PM CET:
> bash 2.05 doesn't dump core on unset, but
> suffered from the same problem still in NetBSD /bin/sh in setting $?
> incorrectly (which in turn affects set -e).  The core dump was bash
> 2.01, and affected MAILCHECK as well as MAIL.
> 
> http://groups.google.com/group/gnu.bash.bug/msg/5a41781550c61d62
> 
> But since bash 2.05a is pretty much dead these days, while NetBSD
> /bin/sh is still alive and kicking, the autoconf section should be
> updated to use a modern example in its claim that unset exit status is
> still a portability problem to be aware of.

Like, this?

Thanks,
Ralf

    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.

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 4cb3a8c..57a298c 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -17758,8 +17758,8 @@ Limitations of Builtins
 @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),
address@hidden FOO} fails when @code{FOO} is not set.  You can use
 
 @smallexample
 FOO=; unset FOO
@@ -17777,8 +17777,8 @@ Limitations of Builtins
 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
address@hidden MAIL} in some cases and dumps core.  So, you should do
-something like
address@hidden 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 || :