merges r23093 from trunk into ruby_1_9_1.

--
* lib/pathname.rb (Pathname#relative_path_from): compares path
  components according to system default case-sensitiveness.
  [ruby-core:22829]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@23229 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 2 deletions

diff --git a/lib/pathname.rb b/lib/pathname.rb
index ed98c7b36..fbb42a66a 100644
--- a/lib/pathname.rb
+++ b/lib/pathname.rb
@@ -194,6 +194,13 @@ class Pathname
     # to_path is implemented so Pathname objects are usable with File.open, etc.
     TO_PATH = :to_path
   end
+
+  SAME_PATHS = if File::FNM_SYSCASE
+    proc {|a, b| a.casecmp(b).zero?}
+  else
+    proc {|a, b| a == b}
+  end
+
   # :startdoc:
 
   #
@@ -731,12 +738,12 @@ class Pathname
       base_prefix, basename = r
       base_names.unshift basename if basename != '.'
     end
-    if dest_prefix != base_prefix
+    unless SAME_PATHS[dest_prefix, base_prefix]
       raise ArgumentError, "different prefix: #{dest_prefix.inspect} and #{base_directory.inspect}"
     end
     while !dest_names.empty? &&
           !base_names.empty? &&
-          dest_names.first == base_names.first
+          SAME_PATHS[dest_names.first, base_names.first]
       dest_names.shift
       base_names.shift
     end