re PR libgcj/20160 (link errors building libgcj tests)

PR libgcj/20160
* ltmain.sh: Avoid creating archives with components that have
duplicate basenames.

From-SVN: r95756

1 files changed, 58 insertions, 14 deletions

diff --git a/ltmain.sh b/ltmain.sh
index 90925cb2f6d..a84825359d3 100644
--- a/ltmain.sh
+++ b/ltmain.sh
@@ -4307,6 +4307,63 @@ fi\
 #	  fi
 #	done
 
+	# POSIX demands no paths to be encoded in archives.  We have
+	# to avoid creating archives with duplicate basenames if we
+	# might have to extract them afterwards, e.g., when creating a
+	# static archive out of a convenience library, or when linking
+	# the entirety of a libtool archive into another (currently
+	# not supported by libtool).
+        if (for obj in $oldobjs
+	    do
+	      $echo "X$obj" | $Xsed -e 's%^.*/%%'
+	    done | sort | sort -uc >/dev/null 2>&1); then
+	  :
+	else
+	  $echo "copying selected object files to avoid basename conflicts..."
+
+	  if test -z "$gentop"; then
+	    gentop="$output_objdir/${outputname}x"
+
+	    $show "${rm}r $gentop"
+	    $run ${rm}r "$gentop"
+	    $show "$mkdir $gentop"
+	    $run $mkdir "$gentop"
+	    status=$?
+	    if test $status -ne 0 && test ! -d "$gentop"; then
+	      exit $status
+	    fi
+	    generated="$generated $gentop"
+	  fi
+
+	  save_oldobjs=$oldobjs
+	  oldobjs=
+	  counter=1
+	  for obj in $save_oldobjs
+	  do
+	    objbase=`$echo "X$obj" | $Xsed -e 's%^.*/%%'`
+	    case " $oldobjs " in
+	    " ") oldobjs=$obj ;;
+	    *[\ /]"$objbase "*)
+	      while :; do
+		# Make sure we don't pick an alternate name that also
+		# overlaps.
+	        newobj=lt$counter-$objbase
+	        counter=`expr $counter + 1`
+		case " $oldobjs " in
+		*[\ /]"$newobj "*) ;;
+		*) if test ! -f "$gentop/$newobj"; then break; fi ;;
+		esac
+	      done
+	      $show "ln $obj $gentop/$newobj || cp $obj $gentop/$newobj"
+	      $run ln "$obj" "$gentop/$newobj" ||
+	      $run cp "$obj" "$gentop/$newobj"
+	      oldobjs="$oldobjs $gentop/$newobj"
+	      ;;
+	    *) oldobjs="$oldobjs $obj" ;;
+	    esac
+	  done
+	fi
+
         eval cmds=\"$old_archive_cmds\"
 
         if len=`expr "X$cmds" : ".*"` &&
@@ -4320,20 +4377,7 @@ fi\
           objlist=
           concat_cmds=
           save_oldobjs=$oldobjs
-	  # GNU ar 2.10+ was changed to match POSIX; thus no paths are
-	  # encoded into archives.  This makes 'ar r' malfunction in
-	  # this piecewise linking case whenever conflicting object
-	  # names appear in distinct ar calls; check, warn and compensate.
-          if (for obj in $save_oldobjs
-	    do
-	      $echo "X$obj" | $Xsed -e 's%^.*/%%'
-	    done | sort | sort -uc >/dev/null 2>&1); then
-	    :
-	  else
-	    $echo "$modename: warning: object name conflicts; overriding AR_FLAGS to 'cq'" 1>&2
-	    $echo "$modename: warning: to ensure that POSIX-compatible ar will work" 1>&2
-	    AR_FLAGS=cq
-	  fi
+
           for obj in $save_oldobjs
           do
             oldobjs="$objlist $obj"