--- gcc/fixincludes	2018/04/24 16:46:51	1.1.1.6
+++ gcc/fixincludes	2018/04/24 16:51:58	1.1.1.10
@@ -8,40 +8,85 @@
 # Directory in which to store the results.
 LIB=/usr/local/lib/gcc-include
 
-mkdir $LIB > /dev/null 2>&1
+# Determine whether this system has symbolic links.
+if ln -s X $LIB/ShouldNotExist 2>/dev/null; then
+  rm -f $LIB/ShouldNotExist
+  LINKS=true
+else
+  LINKS=false
+fi
 
-echo 'Finding header files:'
+echo 'Making directories:'
 cd /usr/include
-files=`find . -print`
-echo 'Checking header files:'
+mkdir $LIB > /dev/null 2>&1
+if $LINKS; then
+  files=`ls -LR | sed -n s/:$//p`
+else
+  files=`find . -type d -print`
+fi
 for file in $files; do
-  if egrep -s '[ 	]_IO[A-Z]*\(|#define._IO|CTRL' $file; then
-    echo Fixing $file
-    if [ -r $file ]; then
-      cp $file ${LIB}/$file >/dev/null 2>&1	\
-      || (mkdir `dirname ${LIB}/$file`		\
-	  && cp $file ${LIB}/$file)		\
-      || echo "Can't copy $file"
-      chmod +w ${LIB}/$file
-      ex ${LIB}/$file <<EOF
-      g/[ 	]_IO[A-Z]*(/s/(\(.\),/('\1',/
-      g/#define._IO/s/'x'/x/g
-      g/CTRL[ 	]*(/s/\(.\))/'\1')/
-      g/#define.CTRL/s/'c'/c/g
-      wq
+  mkdir $LIB/$file > /dev/null 2>&1
+done
+
+# treetops gets an alternating list
+# of old directories to copy
+# and the new directories to copy to.
+treetops="/usr/include ${LIB}"
+
+if $LINKS; then
+  echo 'Making internal symbolic directory links'
+  for file in $files; do
+    dest=`ls -ld $file | sed -n 's/.*-> //p'`
+    if [ "$dest" ]; then    
+      if expr $dest : '[^/].*' > /dev/null; then
+	rmdir ${LIB}/$file > /dev/null 2>&1
+	rm -f ${LIB}/$file > /dev/null 2>&1
+	ln -s $dest ${LIB}/$file > /dev/null 2>&1
+      else				# dont make links outside /usr/include
+	treetops="$treetops $dest ${LIB}/$file"
+      fi
+    fi
+  done
+fi
+
+set - $treetops
+while [ $# != 0 ]; do
+  # $1 is an old directory to copy, and $2 is the new directory to copy to.
+  echo 'Finding header files in $1:'
+  cd $1
+  files=`find . -type f -print`
+  echo 'Checking header files:'
+  for file in $files; do
+    if egrep -s '[ 	]_IO[A-Z]*\(|#define._IO|CTRL' $file; then
+      echo Fixing $file
+      if [ -r $file ]; then
+	cp $file $2/$file >/dev/null 2>&1	\
+	|| echo "Can't copy $file"
+	chmod +w $2/$file
+	ex $2/$file <<EOF
+	g/[ 	]_IO[A-Z]*(/s/(\(.\),/('\1',/
+        g/[ 	]_IO[A-Z]*(.*\\$/.,+1s/(\(.\),/('\1',/
+	g/#define._IO/s/'x'/x/g
+        g/#define._IO.*\\$/.,+1s/'x'/x/g
+	g/[^A-Z]CTRL[ 	]*(/s/\(.\))/'\1')/
+	g/#define.CTRL/s/'c'/c/g
+	wq
 EOF
+	if cmp $file $2/$file >/dev/null 2>&1; then
+	   echo Deleting $2/$file\; no fixes were needed.
+	   rm $2/$file
+	fi
+      fi
     fi
-  fi
+  done
+  shift; shift
 done
 
-
 # Fix one other error in this file: a mismatched quote not inside a C comment.
 file=sundev/vuid_event.h
 if [ -r $file ]; then
   if [ ! -r ${LIB}/$file ]; then
     cp $file ${LIB}/$file >/dev/null 2>&1	\
-    || (mkdir `dirname ${LIB}/$file`		\
-        && cp $file ${LIB}/$file)		\
     || echo "Can't copy $file"
     chmod +w ${LIB}/$file
   fi
@@ -54,3 +99,11 @@ if [ -r ${LIB}/sundev/vuid_event.h ]; th
   wq
 EOF
 fi
+
+echo 'Removing unneeded directories:'
+cd $LIB
+files=`find . -type d -print | sort -r`
+for file in $files; do
+  rmdir $LIB/$file > /dev/null 2>&1
+done
+