make libtool faster v2

[Ralf Wildenhues]

I apologize for turning 30% into 40% within one of my last mails.

That's only true after this change. :-)))
And I got two more in store.

OK to apply to HEAD?

        * config/general.m4sh: basename sed-subst is anchored and thus
        does not need the `g' flag.
        (func_quote_for_eval): Return both the possibly double-quoted
        backslashified as well as only the backslashified argument.
        * config/ltmain.m4sh (func_mode_link): Use both return values,
        to save another sed_quote_subst application per cmdline arg.

Index: config/general.m4sh
===================================================================
RCS file: /cvsroot/libtool/libtool/config/general.m4sh,v
retrieving revision 1.10
diff -u -r1.10 general.m4sh
--- config/general.m4sh 24 Nov 2004 14:04:15 -0000      1.10
+++ config/general.m4sh 30 Nov 2004 13:59:09 -0000
@@ -52,7 +52,7 @@
        "}
 
 dirname="s,/[[^/]]*$,,"
-basename="s,^.*/,,g"
+basename="s,^.*/,,"
 
 # Work around backward compatibility issue on IRIX 6.5. On IRIX 6.4+, sh
 # is ksh but when the shell is invoked as "sh" and the current value of
@@ -265,6 +265,10 @@
 
 # func_quote_for_eval arg
 # Aesthetically quote ARG to be evaled later.
+# This function returns two values: FUNC_QUOTE_FOR_EVAL_RESULT
+# is double-quoted, suitable for a subsequent eval, whereas
+# FUNC_QUOTE_FOR_EVAL_UNQUOTED_RESULT has merely all characters
+# which are still active within double quotes backslashified.
 func_quote_for_eval ()
 {
     my_arg=`$ECHO "X$1" | $Xsed -e "$sed_quote_subst"`
@@ -276,11 +280,13 @@
       # Many Bourne shells cannot handle close brackets correctly
       # in scan sets, so we specify it separately.
       *[[\@<:@\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \        ]]*|*@:>@*|"")
-        my_arg="\"$my_arg\""
+        func_quote_for_eval_result="\"$my_arg\""
         ;;
+      *)
+        func_quote_for_eval_result="$my_arg"
     esac
 
-    func_quote_for_eval_result="$my_arg"
+    func_quote_for_eval_unquoted_result="$my_arg"
 }
 
 
Index: config/ltmain.m4sh
===================================================================
RCS file: /cvsroot/libtool/libtool/config/ltmain.m4sh,v
retrieving revision 1.28
diff -u -r1.28 ltmain.m4sh
--- config/ltmain.m4sh  29 Nov 2004 21:18:26 -0000      1.28
+++ config/ltmain.m4sh  30 Nov 2004 13:59:09 -0000
@@ -2226,8 +2226,8 @@
     while test "$#" -gt 0; do
       arg="$1"
       shift
-      qarg=`$ECHO "X$arg" | $Xsed -e "$sed_quote_subst"`
       func_quote_for_eval "$arg"
+      qarg="$func_quote_for_eval_unquoted_result"
       libtool_args="$libtool_args $func_quote_for_eval_result"
 
       # If the previous option needs an argument, assign it.