cpplib.h (struct cpp_dir): Add new field, canonical_name.

libcpp/ChangeLog
	* include/cpplib.h (struct cpp_dir): Add new field, canonical_name.

gcc/ChangeLog

	* incpath.c: Use HOST_LACKS_INODE_NUMBERS conditional
	rather than OS names to choose INO_T_EQ definition.
	(DIRS_EQ) [!INO_T_EQ]: Don't worry about case in comparison.
	(add_path) [!INO_T_EQ]: Use lrealpath to fill canonical_name field.

From-SVN: r136196
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index 76288a9..92ab291 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -508,6 +508,10 @@
   char *name;
   unsigned int len;
 
+  /* The canonicalized NAME as determined by lrealpath.  This field 
+     is only used by hosts that lack reliable inode numbers.  */
+  char *canonical_name;
+
   /* One if a system header, two if a system header that has extern
      "C" guards for C++.  */
   unsigned char sysp;