[SCM] GNU Autoconf source repository branch, master, updated. v2.63b-86-gf256382

[Eric Blake]

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- Log -----------------------------------------------------------------
commit f2563825193e02c183cf831efff4db7f0d6d574a
Author: Eric Blake <address@hidden>
Date:   Fri Jul 10 06:11:24 2009 -0600

    Document that $srcdir can be used during configure.
    
    * doc/autoconf.texi (Preset Output Variables): Add a paragraph.
    * THANKS: Update.
    Reported by Monty Taylor.
    
    Signed-off-by: Eric Blake <address@hidden>

commit d8db042ad03bd140212c528077f9b5589da91d49
Author: Eric Blake <address@hidden>
Date:   Mon Jul 13 12:54:19 2009 -0600

    Disable asynchronous job notification for parallel tests.
    
    * lib/autotest/general.m4 (AT_INIT) <Driver loop>: Turn off notify
    mode, since zsh leaves it on after 'emulate sh'.
    * doc/autoconf.texi (Limitations of Builtins) <set>: Document that
    job control options are not portable.
    
    Signed-off-by: Eric Blake <address@hidden>

commit 2b5b0dda48597bae5f21209ed015cc0cad61ed24
Author: Eric Blake <address@hidden>
Date:   Mon Jul 13 22:03:27 2009 -0600

    Guarantee that exit status trumps output matching.
    
    * doc/autoconf.texi (Writing Testsuites) <AT_CHECK>: Document this
    better.
    * tests/autotest.at (Skip, parallel skip): Enhance tests.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog               |   18 ++++++++++++++++++
 THANKS                  |    1 +
 doc/autoconf.texi       |   42 ++++++++++++++++++++++++++++++++++++++++--
 lib/autotest/general.m4 |    3 ++-
 tests/autotest.at       |    4 ++--
 5 files changed, 63 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index f8df09e..a2450bd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,23 @@
 2009-07-13  Eric Blake  <address@hidden>
 
+       Document that $srcdir can be used during configure.
+       * doc/autoconf.texi (Preset Output Variables): Add a paragraph.
+       * THANKS: Update.
+       Reported by Monty Taylor.
+
+2009-07-13  Eric Blake  <address@hidden>
+
+       Disable asynchronous job notification for parallel tests.
+       * lib/autotest/general.m4 (AT_INIT) <Driver loop>: Turn off notify
+       mode, since zsh leaves it on after 'emulate sh'.
+       * doc/autoconf.texi (Limitations of Builtins) <set>: Document that
+       job control options are not portable.
+
+       Guarantee that exit status trumps output matching.
+       * doc/autoconf.texi (Writing Testsuites) <AT_CHECK>: Document this
+       better.
+       * tests/autotest.at (Skip, parallel skip): Enhance tests.
+
        Fix nits in recent patches.
        * configure.ac (ac_cv_dir_trailing_space): Avoid $status, for
        zsh.
diff --git a/THANKS b/THANKS
index 30f1b2d..1c10fe4 100644
--- a/THANKS
+++ b/THANKS
@@ -257,6 +257,7 @@ Mikulas Patocka             ?
 Miles Bader                 address@hidden
 Mo DeJong                   address@hidden
 Momchil Velkov              address@hidden
+Monty Taylor                address@hidden
 Morten Eriksen              address@hidden
 Motoyuki Kasahara           address@hidden
 Nathanael Nerode            address@hidden
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index aa6ceba..34df30b 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -2180,7 +2180,6 @@ is what the @command{configure} option @option{--srcdir} 
sets.
 The name of the top source directory, assuming that the working
 directory is the current build directory.
 
-
 @item ac_top_build_prefix
 The name of the top build directory, assuming that the working
 directory is the current build directory.
@@ -2332,6 +2331,15 @@ directories.  Below are listed the other preset ones, 
many of which are
 precious variables (@pxref{Setting Output Variables},
 @code{AC_ARG_VAR}).
 
+The preset variables which are available during @file{config.status}
+(@pxref{Configuration Actions}) may also be used during
address@hidden tests.  For example, it is permissible to reference
address@hidden when constructing a list of directories to pass via
+option @option{-I} during a compiler feature check.  When used in this
+manner, coupled with the fact that @command{configure} is always run
+from the top build directory, it is sufficient to use just
address@hidden instead of @samp{$top_srcdir}.
+
 @c Just say no to ASCII sorting!  We're humans, not computers.
 @c These variables are listed as they would be in a dictionary:
 @c actor
@@ -16257,6 +16265,35 @@ Thus, when writing a script in M4sh, rather than 
trying to rely on
 @samp{set -e}, it is better to append @samp{|| AS_EXIT} to any
 statement where it is desirable to abort on failure.
 
address@hidden @command{set -b}
address@hidden @command{set -m}
+Job control is not provided by all shells, so the use of @samp{set -m}
+or @samp{set -b} must be done with care.  When using @command{zsh} in
+native mode, asynchronous notification (@samp{set -b}) is enabled by
+default, and using @samp{emulate sh} to switch to Posix mode does not
+clear this setting (although asynchronous notification has no impact
+unless job monitoring is also enabled).  Also, @command{zsh} 4.3.10 and
+earlier have a bug where job control can be manipulated in interactive
+shells, but not in subshells or scripts.  Furthermore, some shells, like
address@hidden, fail to treat subshells as interactive, even though the
+parent shell was.
+
address@hidden
+$ @kbd{echo $ZSH_VERSION}
+4.3.10
+$ @kbd{set -m; echo $?}
+0
+$ @kbd{zsh -c 'set -m; echo $?'}
+set: can't change option: -m
+$ @kbd{(set -m); echo $?}
+set: can't change option: -m
+1
+$ @kbd{pdksh -ci 'echo $-; (echo $-)'}
+cim
+c
address@hidden example
+
+
 @item @command{shift}
 @c ------------------
 @prindex @command{shift}
@@ -22750,7 +22787,8 @@ according to the rules of that literal.  Otherwise, the 
value of the
 parameter is treated as text that must exactly match the output given by
 @var{commands} on standard out and standard error (including an empty
 parameter for no output); any differences are captured in the testsuite
-log and the test is failed.  The difference between @code{AT_CHECK} and
+log and the test is failed (unless an unexpected exit status of 77
+skipped the test instead).  The difference between @code{AT_CHECK} and
 @code{AT_CHECK_UNQUOTED} is that only the latter performs shell variable
 expansion (@samp{$}), command substitution (@samp{`}), and backslash
 escaping (@samp{\}) on comparison text given in the @var{stdout} and
diff --git a/lib/autotest/general.m4 b/lib/autotest/general.m4
index b9beb0e..cf88b99 100644
--- a/lib/autotest/general.m4
+++ b/lib/autotest/general.m4
@@ -1250,7 +1250,8 @@ dnl shell to start each parallel task as its own shell 
job, thus as a new
 dnl process group leader.  We then send the signal to all new process groups.
 
 dnl Do we have job control?
-if (set -m && set +m) >/dev/null 2>&1; then
+if (set -m && set +m && set +b) >/dev/null 2>&1; then
+  set +b
   at_job_control_on='set -m' at_job_control_off='set +m' at_job_group=-
 else
   at_job_control_on=: at_job_control_off=: at_job_group=
diff --git a/tests/autotest.at b/tests/autotest.at
index 0063c4a..57382ca 100644
--- a/tests/autotest.at
+++ b/tests/autotest.at
@@ -259,7 +259,7 @@ AT_CHECK_AT_TEST([Fallacy],
   [AT_CHECK([grep failed micro-suite.log], [], [ignore])])
 
 AT_CHECK_AT_TEST([Skip],
-  [AT_CHECK([exit 77], 0, [], [])],
+  [AT_CHECK([echo output; echo irrelevant >&2; exit 77], 0, [mismatch], [])],
   [], [], [], [], [],
   [AT_CHECK([grep skipped micro-suite.log], [], [ignore])])
 
@@ -1155,7 +1155,7 @@ AT_CHECK_AT_TEST([parallel fallacy],
   [AT_CHECK([grep failed micro-suite.log], [], [ignore])], [-j])
 
 AT_CHECK_AT_TEST([parallel skip],
-  [AT_CHECK([exit 77], 0, [], [])],
+  [AT_CHECK([echo output; echo irrelevant >&2; exit 77], 0, [mismatch], [])],
   [], [], [], [], [AT_SKIP_PARALLEL_TESTS],
   [AT_CHECK([grep skipped micro-suite.log], [], [ignore])], [-j])
 


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