HAVE_CXX11_OVERRIDE is required on all supported toolchains

Change-Id: Ibc5462642d0a3cd0f96668472ddc0ac0ae407132

config_host/config_global.h.in

@@ -12,7 +12,6 @@ Any change in this header will cause a rebuild of almost everything.
 #ifndef CONFIG_GLOBAL_H
 #define CONFIG_GLOBAL_H
 
-#define HAVE_CXX11_OVERRIDE 0
 #define HAVE_CXX11_FINAL 0
 #define HAVE_CXX11_PERFECT_FORWARDING 0
 #define HAVE_CXX11_CONSTEXPR 0

configure.ac

@@ -6191,35 +6191,6 @@ CXXFLAGS=$save_CXXFLAGS
 
 AC_SUBST(CXXFLAGS_CXX11)
 
-dnl ==================================
-dnl Check for C++11 "override" support
-dnl ==================================
-
-AC_MSG_CHECKING([whether $CXX supports C++11 "override" syntax])
-save_CXXFLAGS=$CXXFLAGS
-CXXFLAGS="$CXXFLAGS $CXXFLAGS_CXX11"
-AC_LANG_PUSH([C++])
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-struct A
-{
-        virtual void test();
-};
-
-struct B : A
-{
-        virtual void test() override;
-};
-]])],[HAVE_CXX11_OVERRIDE=TRUE],[])
-
-AC_LANG_POP([C++])
-CXXFLAGS=$save_CXXFLAGS
-if test "$HAVE_CXX11_OVERRIDE" = "TRUE"; then
-    AC_MSG_RESULT([yes])
-    AC_DEFINE([HAVE_CXX11_OVERRIDE])
-else
-    AC_MSG_RESULT([no])
-fi
-
 dnl ==================================
 dnl Check for C++11 "final" support
 dnl ==================================

include/sal/types.h

@@ -406,12 +406,12 @@ namespace css = ::com::sun::star;
 
 /** C++11 "override" feature.
 
-    With HAVE_CXX11_OVERRIDE, force the method to override a existing method in
+    For LIBO_INTERNAL_ONLY, force the method to override a existing method in
     parent, error out if the method with the correct signature does not exist.
 
     @since LibreOffice 4.1
 */
-#if HAVE_CXX11_OVERRIDE
+#if defined LIBO_INTERNAL_ONLY
 #define SAL_OVERRIDE override
 #else
 #define SAL_OVERRIDE