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When we pass -Wl,--as-needed to gcc, it will print and error or better warning
that the linker input was not used for compilations withotu link.

That would, aside from the warning in the log, not be a big deal, if some
configure (such as zlib and others) would interpret any output as failure ...

  - Rene Rebe <rene@exactcode.de>

--- gcc-3.4.3/gcc/gcc.c.orig	2005-04-01 17:51:06.958704192 +0200
+++ gcc-3.4.3/gcc/gcc.c	2005-04-01 17:53:23.563937040 +0200
@@ -6324,8 +6324,12 @@
 	   struct compiler *compiler
 	     = lookup_compiler (name, strlen (name), infiles[i].language);
 	   if (compiler == NULL)
+#ifdef ERROR_QUICKLY
 	     error ("%s: linker input file unused because linking not done",
 		    name);
+#else
+		;
+#endif
 	   else if (lang_n_infiles > 0 && compiler != input_file_compiler)
 	     fatal ("cannot specify -o with -c or -S and multiple languages");
 	   else
@@ -6440,11 +6444,13 @@
   /* If options said don't run linker,
      complain about input files to be given to the linker.  */
 
+#ifdef ERROR_QUICKLY
   if (! linker_was_run && error_count == 0)
     for (i = 0; (int) i < n_infiles; i++)
       if (explicit_link_files[i])
 	error ("%s: linker input file unused because linking not done",
 	       outfiles[i]);
+#endif
 
   /* Delete some or all of the temporary files we made.  */