[SCM] GNU Autoconf source repository branch, master, updated. v2.67-49-g4416ea8

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- Log -----------------------------------------------------------------
commit 4416ea8d259ded79b03877ad41b2ec23b10e3f70
Author: Eric Blake <[email protected]>
Date:   Tue Sep 7 13:49:03 2010 -0600

    docs: mention bash vs. POSIXLY_CORRECT
    
    * doc/autoconf.texi (Special Shell Variables) <POSIXLY_CORRECT>:
    Document bash behavior.
    * THANKS: Update.
    Reported by Dustin J. Mitchell, via bug-gnulib list.
    
    Signed-off-by: Eric Blake <[email protected]>

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

Summary of changes:
 ChangeLog         |    6 ++++++
 THANKS            |    1 +
 doc/autoconf.texi |   18 ++++++++++++++++++
 3 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index d43f681..73be221 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2010-09-07  Eric Blake  <[email protected]>
 
+	docs: mention bash vs. POSIXLY_CORRECT
+	* doc/autoconf.texi (Special Shell Variables) <POSIXLY_CORRECT>:
+	Document bash behavior.
+	* THANKS: Update.
+	Reported by Dustin J. Mitchell, via bug-gnulib list.
+
 	docs: enhance recommendations on test usage
 	* doc/autoconf.texi (Limitations of Builtins) <test (strings)>:
 	Mention yet another Solaris issue.
diff --git a/THANKS b/THANKS
index 748c4e4..675d6d9 100644
--- a/THANKS
+++ b/THANKS
@@ -113,6 +113,7 @@ Dietmar P. Schindler        [email protected]
 Dmitry Grebeniuk            [email protected]
 Doug Evans                  [email protected]
 Dries Kimpe                 ?
+Dustin J. Mitchell          [email protected]
 Edouard Bechetoille         [email protected]
 Elbert Pol                  [email protected]
 Eli Zaretskii               [email protected]
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 4d62bf3..15639d9 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -16416,6 +16416,24 @@ separator Bash uses to set up certain environment variables (such as
 if you plan to use non-Posix shells to execute files.  @xref{File System
 Conventions}, for more information about @code{PATH_SEPARATOR}.
 
+@item POSIXLY_CORRECT
+@evindex POSIXLY_CORRECT
+In the GNU environment, exporting @env{POSIXLY_CORRECT} with any value
+(even empty) causes programs to try harder to conform to Posix.
+Autoconf does not directly manipulate this variable, but @command{bash}
+ties the shell variable @env{POSIXLY_CORRECT} to whether the script is
+running in Posix mode.  Therefore, take care when exporting or unsetting
+this variable, so as not to change whether @command{bash} is in Posix
+mode.
+
+@example
+$ @kbd{bash --posix -c 'set -o | grep posix}
+> @kbd{unset POSIXLY_CORRECT}
+> @kbd{set -o | grep posix'}
+posix           on
+posix           off
+@end example
+
 @item PWD
 @evindex PWD
 Posix 1003.1-2001 requires that @command{cd} and


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