* config/ltmain.m4sh (func_mode_link): Eliminate quadratic
	argument parsing with temp files, keep file descriptors
	(FD_LIBTOOL_ARGS, FD_COMPILE_COMMAND, FD_FINALIZE_COMMAND,
	FD_LIBOBJS, FD_NONPIC_OBJS): New.  Use to avoid repeated reopening.
	Slurp in lists after parsing loop, make sure empty lists stay that way.
	(always_gentop): New variable to hold temp dir for scratch.  Will
	be generated for every --mode=link invocation, also in dry run,
	and deleted upon exit.

diff -ru config/ltmain.m4sh config/ltmain.m4sh
--- config/ltmain.m4sh	27 Apr 2005 20:30:38 -0000	1.66
+++ config/ltmain.m4sh	19 May 2005 20:18:50 -0000
@@ -2166,10 +2186,32 @@
       allow_undefined=yes
       ;;
     esac
-    libtool_args="$nonopt"
+    # Use files for long option lists, it avoids quadratic string handling.
+    # We need temp files, though, even in dry run
+    always_gentop=`opt_dry_run=false func_mktempdir`
+    trap "${RM}r \"$always_gentop\"" 0
+m4_define([FD_LIBTOOL_ARGS], [5])dnl
+m4_define([FD_COMPILE_COMMAND], [6])dnl
+m4_define([FD_FINALIZE_COMMAND], [7])dnl
+m4_define([FD_LIBOBJS], [8])dnl
+m4_define([FD_NONPIC_OBJS], [9])dnl
+    libtool_args_file=$always_gentop/libtool_args
+    compile_command_file=$always_gentop/compile_command
+    finalize_command_file=$always_gentop/finalize_command
+    libobjs_file=$always_gentop/libobjs
+    non_pic_objs_file=$always_gentop/non_pic_objs
+    exec FD_LIBTOOL_ARGS>"$libtool_args_file" \
+	 FD_COMPILE_COMMAND>"$compile_command_file" \
+	 FD_FINALIZE_COMMAND>"$finalize_command_file" \
+	 FD_LIBOBJS>"$libobjs_file" \
+	 FD_NONPIC_OBJS>"$non_pic_objs_file"
+	 
+    $ECHO " " >&FD_LIBOBJS
+    $ECHO " " >&FD_NONPIC_OBJS
+    $ECHO " $nonopt" >&FD_LIBTOOL_ARGS
+    $ECHO " $nonopt" >&FD_COMPILE_COMMAND
+    $ECHO " $nonopt" >&FD_FINALIZE_COMMAND
     base_compile="$nonopt $@"
-    compile_command="$nonopt"
-    finalize_command="$nonopt"
 
     compile_rpath=
     finalize_rpath=
@@ -2194,12 +2236,10 @@
     export_symbols=
     export_symbols_regex=
     generated=
-    libobjs=
     ltlibs=
     module=no
     no_install=no
     objs=
-    non_pic_objects=
     precious_files_regex=
     prefer_static_libs=no
     preload=no
@@ -2235,8 +2275,8 @@
 	  if test -n "$link_static_flag"; then
 	    dlopen_self=$dlopen_self_static
 	    # See comment for -static flag below, for more details.
-	    compile_command="$compile_command $link_static_flag"
-	    finalize_command="$finalize_command $link_static_flag"
+	    $ECHO " $link_static_flag" >&FD_COMPILE_COMMAND
+	    $ECHO " $link_static_flag" >&FD_FINALIZE_COMMAND
 	  fi
 	else
 	  if test -z "$pic_flag" && test -n "$link_static_flag"; then
@@ -2260,14 +2300,14 @@
       shift
       func_quote_for_eval "$arg"
       qarg="$func_quote_for_eval_unquoted_result"
-      libtool_args="$libtool_args $func_quote_for_eval_result"
+      $ECHO " $func_quote_for_eval_result" >&FD_LIBTOOL_ARGS
 
       # If the previous option needs an argument, assign it.
       if test -n "$prev"; then
 	case $prev in
 	output)
-	  compile_command="$compile_command @OUTPUT@"
-	  finalize_command="$finalize_command @OUTPUT@"
+	  $ECHO " @OUTPUT@" >&FD_COMPILE_COMMAND
+	  $ECHO " @OUTPUT@" >&FD_FINALIZE_COMMAND
 	  ;;
 	esac
 
@@ -2275,8 +2315,8 @@
 	dlfiles|dlprefiles)
 	  if test "$preload" = no; then
 	    # Add the symbol object into the linking commands.
-	    compile_command="$compile_command @SYMFILE@"
-	    finalize_command="$finalize_command @SYMFILE@"
+	    $ECHO " @SYMFILE@" >&FD_COMPILE_COMMAND
+	    $ECHO " @SYMFILE@" >&FD_FINALIZE_COMMAND
 	    preload=yes
 	  fi
 	  case $arg in
@@ -2398,7 +2438,7 @@
 		  fi
 
 		  # A PIC object.
-		  libobjs="$libobjs $pic_object"
+		  $ECHO " $pic_object" >&FD_LIBOBJS
 		  arg="$pic_object"
 		fi
 
@@ -2408,7 +2448,7 @@
 		  non_pic_object="$xdir$non_pic_object"
 
 		  # A standard non-PIC object
-		  non_pic_objects="$non_pic_objects $non_pic_object"
+		  $ECHO " $non_pic_object" >&FD_NONPIC_OBJS
 		  if test -z "$pic_object" || test "$pic_object" = none ; then
 		    arg="$non_pic_object"
 		  fi
@@ -2416,7 +2456,7 @@
 		  # If the PIC object exists, use it instead.
 		  # $xdir was prepended to $pic_object above.
 		  non_pic_object="$pic_object"
-		  non_pic_objects="$non_pic_objects $non_pic_object"
+		  $ECHO " $non_pic_object" >&FD_NONPIC_OBJS
 		fi
 	      else
 		# Only an error if not doing a dry-run.
@@ -2427,8 +2467,8 @@
 
 		  pic_object=`$ECHO "X${xdir}${objdir}/${arg}" | $Xsed -e "$lo2o"`
 		  non_pic_object=`$ECHO "X${xdir}${arg}" | $Xsed -e "$lo2o"`
-		  libobjs="$libobjs $pic_object"
-		  non_pic_objects="$non_pic_objects $non_pic_object"
+		  $ECHO " $pic_object" >&FD_LIBOBJS
+		  $ECHO " $non_pic_object" >&FD_NONPIC_OBJS
 	        else
 		  func_fatal_error "\`$arg' is not a valid libtool object"
 		fi
@@ -2487,23 +2527,23 @@
 	  linker_flags="$linker_flags $qarg"
 	  compiler_flags="$compiler_flags $qarg"
 	  prev=
-	  compile_command="$compile_command $qarg"
-	  finalize_command="$finalize_command $qarg"
+	  $ECHO " $qarg" >&FD_COMPILE_COMMAND
+	  $ECHO " $qarg" >&FD_FINALIZE_COMMAND
 	  continue
 	  ;;
 	xcompiler)
 	  compiler_flags="$compiler_flags $qarg"
 	  prev=
-	  compile_command="$compile_command $qarg"
-	  finalize_command="$finalize_command $qarg"
+	  $ECHO " $qarg" >&FD_COMPILE_COMMAND
+	  $ECHO " $qarg" >&FD_FINALIZE_COMMAND
 	  continue
 	  ;;
 	xlinker)
 	  linker_flags="$linker_flags $qarg"
 	  compiler_flags="$compiler_flags $wl$qarg"
 	  prev=
-	  compile_command="$compile_command $wl$qarg"
-	  finalize_command="$finalize_command $wl$qarg"
+	  $ECHO " $wl$qarg" >&FD_COMPILE_COMMAND
+	  $ECHO " $wl$qarg" >&FD_FINALIZE_COMMAND
 	  continue
 	  ;;
 	*)
@@ -2574,8 +2614,8 @@
       -L[[A-Z]][[A-Z]]*:*)
 	case $with_gcc/$host in
 	no/*-*-irix* | /*-*-irix*)
-	  compile_command="$compile_command $arg"
-	  finalize_command="$finalize_command $arg"
+	  $ECHO " $arg" >&FD_COMPILE_COMMAND
+	  $ECHO " $arg" >&FD_FINALIZE_COMMAND
 	  ;;
 	esac
 	continue
@@ -2657,17 +2697,17 @@
       # Tru64 UNIX uses -model [arg] to determine the layout of C++
       # classes, name mangling, and exception handling.
       -model)
-	compile_command="$compile_command $arg"
 	compiler_flags="$compiler_flags $arg"
-	finalize_command="$finalize_command $arg"
+	$ECHO " $arg" >&FD_COMPILE_COMMAND
+	$ECHO " $arg" >&FD_FINALIZE_COMMAND
 	prev=xcompiler
 	continue
 	;;
 
       -mt|-mthreads|-kthread|-Kthread|-pthread|-pthreads|--thread-safe)
 	compiler_flags="$compiler_flags $arg"
-	compile_command="$compile_command $arg"
-	finalize_command="$finalize_command $arg"
+	$ECHO " $arg" >&FD_COMPILE_COMMAND
+	$ECHO " $arg" >&FD_FINALIZE_COMMAND
 	case "$new_inherited_linker_flags " in
 	    *" $arg "*) ;;
 	    * ) new_inherited_linker_flags="$new_inherited_linker_flags $arg" ;;
@@ -2840,8 +2880,8 @@
       -64|-mips[[0-9]]|-r[[0-9]][[0-9]]*|-xarch=*|-xtarget=*|+DA*|+DD*|-q*|-m*)
         func_quote_for_eval "$arg"
 	arg="$func_quote_for_eval_result"
-        compile_command="$compile_command $arg"
-        finalize_command="$finalize_command $arg"
+        $ECHO " $arg" >&FD_COMPILE_COMMAND
+        $ECHO " $arg" >&FD_FINALIZE_COMMAND
         compiler_flags="$compiler_flags $arg"
         continue
         ;;
@@ -2906,7 +2946,7 @@
 	    fi
 
 	    # A PIC object.
-	    libobjs="$libobjs $pic_object"
+	    $ECHO " $pic_object" >&FD_LIBOBJS
 	    arg="$pic_object"
 	  fi
 
@@ -2916,7 +2956,7 @@
 	    non_pic_object="$xdir$non_pic_object"
 
 	    # A standard non-PIC object
-	    non_pic_objects="$non_pic_objects $non_pic_object"
+	    $ECHO " $non_pic_object" >&FD_NONPIC_OBJS
 	    if test -z "$pic_object" || test "$pic_object" = none ; then
 	      arg="$non_pic_object"
 	    fi
@@ -2924,7 +2964,7 @@
 	    # If the PIC object exists, use it instead.
 	    # $xdir was prepended to $pic_object above.
 	    non_pic_object="$pic_object"
-	    non_pic_objects="$non_pic_objects $non_pic_object"
+	    $ECHO " $non_pic_object" >&FD_NONPIC_OBJS
 	  fi
 	else
 	  # Only an error if not doing a dry-run.
@@ -2935,8 +2975,8 @@
 
 	    pic_object=`$ECHO "X${xdir}${objdir}/${arg}" | $Xsed -e "$lo2o"`
 	    non_pic_object=`$ECHO "X${xdir}${arg}" | $Xsed -e "$lo2o"`
-	    libobjs="$libobjs $pic_object"
-	    non_pic_objects="$non_pic_objects $non_pic_object"
+	    $ECHO " $pic_object" >&FD_LIBOBJS
+	    $ECHO " $non_pic_object" >&FD_NONPIC_OBJS
 	  else
 	    func_fatal_error "\`$arg' is not a valid libtool object"
 	  fi
@@ -2978,11 +3018,25 @@
 
       # Now actually substitute the argument into the commands.
       if test -n "$arg"; then
-	compile_command="$compile_command $arg"
-	finalize_command="$finalize_command $arg"
+	$ECHO " $arg" >&FD_COMPILE_COMMAND
+	$ECHO " $arg" >&FD_FINALIZE_COMMAND
       fi
     done # argument parsing loop
 
+    exec FD_LIBTOOL_ARGS>&- \
+	 FD_COMPILE_COMMAND>&- \
+	 FD_FINALIZE_COMMAND>&- \
+	 FD_LIBOBJS>&- \
+	 FD_NONPIC_OBJS>&-
+    libtool_args=`$SED 's/^ //' <"$libtool_args_file" | $NL2SP`
+    compile_command=`$SED 's/^ //' <"$compile_command_file" | $NL2SP`
+    finalize_command=`$SED 's/^ //' <"$finalize_command_file" | $NL2SP`
+    libobjs=`$SED 's/^ //' <"$libobjs_file" | $NL2SP`
+    non_pic_objects=`$SED 's/^ //' <"$non_pic_objs_file" | $NL2SP`
+    # Do not let `test -z' fail:
+    case $libobjs in ' ') libobjs=;; esac
+    case $non_pic_objects in ' ') non_pic_objects=;; esac
+
     test -n "$prev" && \
       func_fatal_help "the \`$prevarg' option requires an argument"