Don't call setlocale("") on startup by default any longer.

This undoes the changes of r44773 because calling setlocale() resulted in C
locale being set differently from C++ locale which was confusing and led to
huge slowdowns in any code using std::stream with at least MinGW. And setting
the C++ locale to be the same, as r72719 tried to do, doesn't seem to be
practical as it results in immediate crashes under OS X and MinGW when used
under XP.

Do provide wxApp::SetCLocale() helper to explicitly do what was previously
done implicitly, even though currently it is a trivial wrapper for setlocale()
and we don't even need to call gtk_set_locale() as it has never done anything
else and is deprecated since GTK+ 2.24.

Closes #14780.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72951 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/appbase.cpp

@@ -174,10 +174,6 @@ wxAppConsoleBase::~wxAppConsoleBase()
 
 bool wxAppConsoleBase::Initialize(int& WXUNUSED(argc), wxChar **WXUNUSED(argv))
 {
-#if wxUSE_INTL
-    GetTraits()->SetLocale();
-#endif // wxUSE_INTL
-
     return true;
 }
 
@@ -784,6 +780,18 @@ void wxAppConsoleBase::OnAssert(const wxChar *file,
     OnAssertFailure(file, line, NULL, cond, msg);
 }
 
+// ----------------------------------------------------------------------------
+// Miscellaneous other methods
+// ----------------------------------------------------------------------------
+
+void wxAppConsoleBase::SetCLocale()
+{
+    // We want to use the user locale by default in GUI applications in order
+    // to show the numbers, dates &c in the familiar format -- and also accept
+    // this format on input (especially important for decimal comma/dot).
+    wxSetlocale(LC_ALL, "");
+}
+
 // ============================================================================
 // other classes implementations
 // ============================================================================
@@ -836,26 +844,6 @@ bool wxConsoleAppTraitsBase::HasStderr()
 // wxAppTraits
 // ----------------------------------------------------------------------------
 
-#if wxUSE_INTL
-void wxAppTraitsBase::SetLocale()
-{
-    // We want to use the user locale by default in GUI applications in order
-    // to show the numbers, dates &c in the familiar format -- and also accept
-    // this format on input (especially important for decimal comma/dot).
-    wxSetlocale(LC_ALL, "");
-
-#if wxUSE_STL
-    // At least in some environments, e.g. MinGW-64, if the global C++ locale
-    // is different from the global C locale, all stream operations temporarily
-    // change the locale resulting in a huge slowdown (3 times slower in some
-    // real-life applications), so change the C++ locale to match.
-    std::locale::global(std::locale(""));
-#endif  //wxUSE_STL
-
-    wxUpdateLocaleIsUtf8();
-}
-#endif
-
 #if wxUSE_THREADS
 void wxMutexGuiEnterImpl();
 void wxMutexGuiLeaveImpl();