[SCM] GNU Autoconf source repository branch, master, updated. v2.68-98-g2f3cec7

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 2f3cec7dfc609308f645b593dc5e396f9f790f4d
Author: Eric Blake <address@hidden>
Date:   Fri Nov 11 13:51:33 2011 -0700

    doc: mention export portability hint
    
    * doc/autoconf.texi (Limitations of Builtins) <export>: Document
    export limitation.
    Suggested by Bruno Haible.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog         |    7 +++++++
 doc/autoconf.texi |   14 ++++++++++++++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index e51f7d7..72b1dbc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2011-11-11  Eric Blake  <address@hidden>
+
+       doc: mention export portability hint
+       * doc/autoconf.texi (Limitations of Builtins) <export>: Document
+       export limitation.
+       Suggested by Bruno Haible.
+
 2011-10-21  Stefano Lattarini  <address@hidden>
 
        fortran: define $GFC to "yes" if $FC is a GNU compiler
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index b6dc67b..417c432 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -17642,6 +17642,20 @@ $ @kbd{ash -c 'export foo; env | grep foo'}
 foo=
 @end example
 
+Posix requires @command{export} to honor assignments made as arguments,
+but older shells did not support this.  Portable scripts should separate
+assignments and exports into different statements (it does not matter if
+the export comes before or after the assignment).
+
address@hidden
+$ @kbd{bash -c 'export foo=bar; echo $foo'}
+bar
+$ @kbd{/bin/sh -c 'export foo=bar; echo $foo'}
+/bin/sh: foo=bar: is not an identifier
+$ @kbd{/bin/sh -c 'export foo; foo=bar; echo $foo'}
+bar
address@hidden example
+
 @item @command{false}
 @c ------------------
 @prindex @command{false}


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