[SCM] GNU Autoconf source repository branch, master, updated. v2.65-48-gd174a53

[Eric Blake]

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- Log -----------------------------------------------------------------
commit d174a5362e1adc52d9ef0e9448b2ad142512e42f
Author: Eric Blake <address@hidden>
Date:   Tue Mar 2 15:39:58 2010 -0700

    Fix shell code in AS_TR_SH documentation.
    
    * doc/autoconf.texi (Common Shell Constructs) <AS_TR_SH>: Fix
    example to expand to valid shell code.
    Reported by Ralf Wildenhues.
    
    Signed-off-by: Eric Blake <address@hidden>

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

Summary of changes:
 ChangeLog         |    5 +++++
 doc/autoconf.texi |    7 +++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 747a629..5aae86c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2010-03-02  Eric Blake  <address@hidden>
 
+       Fix shell code in AS_TR_SH documentation.
+       * doc/autoconf.texi (Common Shell Constructs) <AS_TR_SH>: Fix
+       example to expand to valid shell code.
+       Reported by Ralf Wildenhues.
+
        Improve documentation on AC_{COMPILE,LINK}_IFELSE.
        * doc/autoconf.texi (Running the Compiler): Mention that the
        object file is available after a successful compile.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 7838f76..8fca9ae 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -13206,12 +13206,15 @@ echo "[#]define AS_TR_CPP([HAVE_$type]) 1"
 
 @defmac AS_TR_SH (@var{expression})
 @asindex{TR_SH}
-Transform @var{expression} into a valid shell variable name.  For example:
+Transform @var{expression} into shell code that generates a valid shell
+variable name.  The result is literal when possible at m4 time, but must
+be used with @code{eval} if @var{expression} causes shell indirections.
+For example:
 
 @example
 # This outputs "Have it!".
 header="sys/some file.h"
-AS_TR_SH([HAVE_$header])=yes
+eval AS_TR_SH([HAVE_$header])=yes
 if test "x$HAVE_sys_some_file_h" = xyes; then echo "Have it!"; fi
 @end example
 @end defmac


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