[SCM] GNU Autoconf source repository branch, master, updated. v2.65-105-gd11a65c

[Ralf Wildenhues]

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- Log -----------------------------------------------------------------
commit d11a65ced676409559ac09150b93be9c1eb99736
Author: Ralf Wildenhues <address@hidden>
Date:   Wed Jun 23 19:55:02 2010 +0200

    Further improve docs about nested double-quotes and backquotes.
    
    * doc/autoconf.texi (Shellology): Remove anchor for pdksh.
    Move quoting bug example to ...
    (Shell Substitutions): ... here.  Document which behavior is
    specified by Posix.
    
    Signed-off-by: Ralf Wildenhues <address@hidden>

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

Summary of changes:
 ChangeLog         |    6 ++++++
 doc/autoconf.texi |   35 +++++++++++++++++------------------
 2 files changed, 23 insertions(+), 18 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 21aa16a..d3983c1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2010-06-23  Ralf Wildenhues  <address@hidden>
 
+       Further improve docs about nested double-quotes and backquotes.
+       * doc/autoconf.texi (Shellology): Remove anchor for pdksh.
+       Move quoting bug example to ...
+       (Shell Substitutions): ... here.  Document which behavior is
+       specified by Posix.
+
        Coverage for Fortran compiler macros.
        * tests/fortran.at (AC_OPENMP and Fortran 77)
        (AC_OPENMP and Fortran): Simplify, using AT_CHECK_CONFIGURE.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 81b0845..34ae872 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -14639,7 +14639,6 @@ the standard shell conform to Posix.
 
 @item Pdksh
 @prindex @samp{pdksh}
address@hidden
 A public-domain clone of the Korn shell called @command{pdksh} is widely
 available: it has most of the @samp{ksh88} features along with a few of
 its own.  It usually sets @code{KSH_VERSION}, except if invoked as
@@ -14647,20 +14646,7 @@ its own.  It usually sets @code{KSH_VERSION}, except 
if invoked as
 Posix compatibility by running @samp{set -o posix}.  Unfortunately, with
 @command{pdksh} 5.2.14 (the latest stable version as of January 2007)
 Posix mode is buggy and causes @command{pdksh} to depart from Posix in
-at least one respect:
-
address@hidden
-$ @kbd{echo "`echo \"hello\"`"}
-hello
-$ @kbd{set -o posix}
-$ @kbd{echo "`echo \"hello\"`"}
-"hello"
address@hidden example
-
-The last line of output contains spurious quotes.  This is yet another
-reason why portable shell code should not contain
address@hidden"address@hidden"@dots{}\"@dots{}`"} constructs (@pxref{Shell
-Substitutions}).
+at least one respect, see @ref{Shell Substitutions}.
 
 @item Zsh
 @cindex Zsh
@@ -15163,9 +15149,22 @@ ksh: bar | sed 's, ,,': cannot execute
 @end example
 
 @noindent
-Worse yet, not all shells understand @code{"address@hidden"@dots{}\"@dots{}`"}
-the same way (@pxref{pdksh}).  There is just no portable way to use 
double-quoted
-strings inside double-quoted back-quoted expressions (pfew!).
+Posix does not specify behavior for this sequence.  On the other hand,
+behavior for @code{"address@hidden"@dots{}\"@dots{}`"} is specified by Posix,
+but in practice, not all shells understand it the same way: pdksh 5.2.14
+prints spurious quotes when in Posix mode:
+
address@hidden
+$ @kbd{echo "`echo \"hello\"`"}
+hello
+$ @kbd{set -o posix}
+$ @kbd{echo "`echo \"hello\"`"}
+"hello"
address@hidden example
+
address@hidden
+There is just no portable way to use double-quoted strings inside
+double-quoted back-quoted expressions (pfew!).
 
 @table @code
 @item $@@


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