Implement $ECHO with print -r, printf or cat in a shell function.

* configure.ac: Bump Autoconf requirement.
* libltdl/config/general.m4sh: Use $as_echo as default $ECHO.
* tests/testsuite.at: Use $as_echo as default $ECHO.

* libltdl/m4/libtool.m4 (LT_INIT): Add _LT_SHELL_INIT to
work around Autoconf <2.64 bug.
(_LT_OUTPUT_LIBTOOL_COMMANDS_INIT): Add func_fallback_echo.
Eliminate lt_ECHO requoting.
(_LT_SHELL_INIT): Use a public M4sh diversion.
(_LT_PROG_ECHO_BACKSLASH): Rewrite.
(LT_CMD_MAX_LEN): Do not use --fallback-echo.
* libltdl/config/ltmain.m4sh: Remove --no-reexec and --fallback-echo
handling.
(func_fallback_echo): New.
(func_emit_wrapper_part1): Quote ECHO.  Remove --no-reexec and
--fallback-echo handling.
(Execute mode): Do not set qecho.

1 files changed, 6 insertions, 7 deletions

diff --git a/HACKING b/HACKING
index c7efe410..71f2dad7 100644
--- a/HACKING
+++ b/HACKING
@@ -290,16 +290,15 @@ yyyy-mm-dd  Name of Author  <email@address>  (tiny change)
 ======================
 
 * Be careful with both `echo' and `$ECHO'.  As the latter may be one of
-   echo
-   print -r
+   print -r --
    printf %s\n
-   $CONFIG_SHELL $0 --fallback-echo
-  it may not have more than one argument, its value may not be eval'ed
-  and the argument may not start with a `-'.  As a rule of thumb, use
+   func_fallback_echo
+  it may not have more than one argument and its value may not be
+  eval'ed.  However, the argument may start with a `-'.  As a rule of
+  thumb, use
    echo ..		for literal (constant) strings without leading
 			hyphen and no backslashes within,
-   $ECHO ".."		for strings without leading hyphen,
-   $ECHO "X.." | $Xsed	otherwise.
+   $ECHO ".."		otherwise.
 
 * The Autoconf manual says that giving an empty parameter is equivalent
   to not giving it at all.  (In particular, the Autoconf manual doesn't