QCollator: don't pipe bcp47Name() through QString

Give QCollator access to QLocalePrivate::bcp47Name(), to avoid
both the latin-1 -> UTF-16 conversion in QLocale::bcp47Name(),
as well all as

- the replace('-', '_').toLatin1() call in ICU
- the toLocal8Bit() call in macOS
- the toUtf8() call in Windows

implementations of QCollatorPrivate::init().

This is safe, since, according to https://tools.ietf.org/html/bcp47,
a BCP47 name only contains US-ASCII (ALPHA used, which is defined by
https://tools.ietf.org/html/rfc5234 to be [a-zA-Z] only).

Change-Id: Id56befb1b5a7983494d848cdabf7ebeda377cf9f
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/corelib/tools/qcollator_macx.cpp b/src/corelib/tools/qcollator_macx.cpp
index b4d93e58d4..c4eb8e6978 100644
--- a/src/corelib/tools/qcollator_macx.cpp
+++ b/src/corelib/tools/qcollator_macx.cpp
@@ -38,9 +38,12 @@
 ****************************************************************************/
 
 #include "qcollator_p.h"
+#include "qlocale_p.h"
 #include "qstringlist.h"
 #include "qstring.h"
+
 #include <QtCore/private/qcore_mac_p.h>
+
 #include <CoreFoundation/CoreFoundation.h>
 #include <CoreFoundation/CFLocale.h>
 
@@ -53,7 +56,7 @@ void QCollatorPrivate::init()
 {
     cleanup();
     LocaleRef localeRef;
-    int rc = LocaleRefFromLocaleString(locale.bcp47Name().toLocal8Bit(), &localeRef);
+    int rc = LocaleRefFromLocaleString(QLocalePrivate::get(locale)->bcp47Name().constData(), &localeRef);
     if (rc != 0)
         qWarning("couldn't initialize the locale");