libtool: bug in AC_PROG_LD

[Yaakov (Cygwin/X)]

Chuck,

There's a bug in LT_PATH_LD (AC_PROG_LD) when called prior to LT_INIT 
(AC_PROG_LIBTOOL):

checking for ld used by gcc... 
/usr/lib/gcc/i686-pc-cygwin/4.3.2/../../../../i686-pc-cygwin/bin/ld: no 
input files
./configure: line 3955: : command not found

Yet this does not occur when the same macro is run by LT_INIT.

Here's the offending hunk:

       # Canonicalize the pathname of ld
       ac_prog=`$ECHO "$ac_prog"| $SED 's%\\\\%/%g'`
       while $ECHO "$ac_prog" | $GREP "$re_direlt" > /dev/null 2>&1; do
     ac_prog=`$ECHO $ac_prog| $SED "s%$re_direlt%/%"`
       done

The problem is that $ECHO hasn't been defined yet.  This is done by 
_LT_PROG_ECHO_BACKSLASH, which is called at the beginning of LT_INIT, 
but isn't an explicit requirement of LT_PATH_LD, which may be called on 
its own.  (AFAICS, all other macros which use $ECHO are libtool-internal 
and would only be called after LT_INIT.)

Patch attached.


Yaakov
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