Disable the use of compiler TLS by default under Windows.

While compiler TLS support is simpler to use and much faster than using our
own Win32 API-based TLS implementation, it results in difficult to debug
crashes when used inside a dynamically loaded DLL under Windows XP, so disable
it by default to be safe.

Closes #13116.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75568 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/chkconf.h

@@ -115,6 +115,27 @@
 #endif
 
 
+/*
+ * Unfortunately we can't use compiler TLS support if the library can be used
+ * inside a dynamically loaded DLL under Windows XP, as this can result in hard
+ * to diagnose crashes due to the bugs in Windows TLS support, see #13116.
+ *
+ * So we disable it unless we can be certain that the code will never run under
+ * XP, as is the case if we're using a compiler which doesn't support XP such
+ * as MSVC 11+, unless it's used with the special "_xp" toolset, in which case
+ * _USING_V110_SDK71_ is defined.
+ *
+ * However defining wxUSE_COMPILER_TLS as 2 overrides this safety check, see
+ * the comments in wx/setup.h.
+ */
+#if wxUSE_COMPILER_TLS == 1
+    #if !wxCHECK_VISUALC_VERSION(11) || defined(_USING_V110_SDK71_)
+        #undef wxUSE_COMPILER_TLS
+        #define wxUSE_COMPILER_TLS 0
+    #endif
+#endif
+
+
 /*
  * disable the settings which don't work for some compilers
  */