Implement case-insensitive and Unicode-compliant collation on MS-Windows.

 src/fns.c (Fstring_collate_lessp, Fstring_collate_equalp): Doc fix.
 src/w32proc.c (w32_compare_strings): Accept additional argument
 IGNORE_CASE.  Set up the flags for CompareStringW to ignore case
 if requested.  If w32-collate-ignore-punctuation is non-nil, add
 NORM_IGNORESYMBOLS to the flags.
 (LINGUISTIC_IGNORECASE): Define if not already defined.
 (syms_of_ntproc) <Vw32_collate_ignore_punctuation>: New variable.
 src/sysdep.c (str_collate) [WINDOWSNT]: Adapt to the interface
 change.
 src/w32.h: Adjust prototype of w32_compare_strings.

 etc/NEWS: Mention w32-collate-ignore-punctuation.

Fixes: debbugs:18051

2 files changed, 11 insertions, 0 deletions

diff --git a/etc/ChangeLog b/etc/ChangeLog
index 4968d8d7203..edec0dd2c13 100644
--- a/etc/ChangeLog
+++ b/etc/ChangeLog
@@ -1,3 +1,7 @@
+2014-08-29  Eli Zaretskii  <eliz@gnu.org>
+
+        * NEWS: Mention w32-collate-ignore-punctuation.
+
 2014-08-29  Dmitry Antipov  <dmantipov@yandex.ru>
 
         * NEWS: Mention that `sort' can handle vectors.
diff --git a/etc/NEWS b/etc/NEWS
index 47ad2b91ebd..c82f2b976ff 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -72,6 +72,13 @@ environment.  For the time being this is implemented for modern POSIX
 systems and for MS-Windows, for other systems they fall back to their
 counterparts `string-lessp' and `string-equal'.
 
+*** The MS-Windows specific variable `w32-collate-ignore-punctuation',
+if set to a non-nil value, causes the above 2 functions to ignore
+symbol and punctuation characters when collating strings.  This
+emulates the behavior of modern Posix platforms when the locale's
+codeset is "UTF-8" (as in "en_US.UTF-8").  This is needed because
+MS-Windows doesn't support UTF-8 as codeset in its locales.
+
 
 * Editing Changes in Emacs 24.5