Index: libstdc++-v3/testsuite/lib/prune.exp
===================================================================
--- libstdc++-v3/testsuite/lib/prune.exp	(revision 170906)
+++ libstdc++-v3/testsuite/lib/prune.exp	(working copy)
@@ -55,6 +55,9 @@ proc libstdc++-dg-prune { system text } 
     regsub -all "(^|\n)\[^\n\]*warning: DWARFDebugInfoEntry::AppendDependants\[^\n\]*AT_\[^\n\]*_bound\[^\n\]*FORM_ref4\[^\n\]*" $text "" text
     regsub -all "(^|\n)\[^\n\]*warning:\[^\n\]*TAG_variable:  AT_location\[^\n\]*didn't have valid function low pc\[^\n\]*" $text "" text
 
+    # Ignore harmless warnings from Xcode 4.0.
+    regsub -all "(^|\n)\[^\n\]*ld: warning: could not create compact unwind for\[^\n\]*" $text "" text
+
     foreach p $additional_prunes {
 	if { [string length $p] > 0 } {
 	    # Following regexp matches a complete line containing $p.
Index: gcc/testsuite/lib/prune.exp
===================================================================
--- gcc/testsuite/lib/prune.exp	(revision 170906)
+++ gcc/testsuite/lib/prune.exp	(working copy)
@@ -56,6 +56,9 @@ proc prune_gcc_output { text } {
     regsub -all "(^|\n)\[^\n\]*ld: warning: can't add line info to anonymous symbol\[^\n\]*" $text "" text
     regsub -all "(^|\n)\[^\n\]*warning: DWARFDebugInfoEntry::AppendDependants\[^\n\]*AT_\[^\n\]*_bound\[^\n\]*FORM_ref4\[^\n\]*" $text "" text
     regsub -all "(^|\n)\[^\n\]*warning:\[^\n\]*TAG_variable:  AT_location\[^\n\]*didn't have valid function low pc\[^\n\]*" $text "" text
+
+    # Ignore harmless warnings from Xcode 4.0.
+    regsub -all "(^|\n)\[^\n\]*ld: warning: could not create compact unwind for\[^\n\]*" $text "" text
     
     #send_user "After:$text\n"