Fixing some examples, adding scripts for compiling xilinx libs with ghdl

xilinx_lib/xilinx_ghdl_unisim

@@ -0,0 +1,52 @@
+#!/bin/sh
+# $Id: xilinx_ghdl_unisim 88 2007-10-12 20:37:45Z mueller $
+#
+if [ -z "$XILINX" ]
+then
+  echo "XILINX not defined"
+  exit 1
+fi
+#
+cd $XILINX
+echo "============================================================"
+echo "* Build ghdl UNISIM libs for $XILINX"
+echo "============================================================"
+#
+if [ ! -d ghdl ]
+then
+  mkdir ghdl
+fi
+#
+cd $XILINX/ghdl
+if [ ! -d unisim  ]
+then
+  mkdir unisim
+fi
+#
+cd $XILINX/ghdl/unisim
+cp $XILINX/vhdl/src/unisims/unisim_VCOMP.vhd .
+cp $XILINX/vhdl/src/unisims/unisim_VPKG.vhd .
+#
+if [ ! -d unisim_vital_chop  ]
+then
+  mkdir unisim_vital_chop
+fi
+cd unisim_vital_chop
+xilinx_vhdl_chop $XILINX/vhdl/src/unisims/unisim_VITAL.vhd
+#
+cd ..
+echo "# ghdl ... unisim_VCOMP.vhd"
+ghdl -a --ieee=synopsys --work=unisim unisim_VCOMP.vhd
+echo "# ghdl ... unisim_VPKG.vhd"
+ghdl -a --ieee=synopsys --work=unisim unisim_VPKG.vhd
+ 
+for file in `find unisim_vital_chop -name "*.vhd"`
+do
+  echo "# ghdl ... $file"
+  ghdl -a -fexplicit --ieee=synopsys --work=unisim 2>&1 $file |\
+      tee $file.ghdl.log
+done
+#
+echo "--- scan for compilation errors:"
+find unisim_vital_chop -name "*.ghdl.log" | xargs grep error
+#