[libsigc++2] Remove unused SIGC_CXX_SELF_REFERENCE_IN_MEMBER_INITIALIZATION() configure check.

[Murray Cumming <murrayc src gnome org>]

commit 473903c7aaad54d07d3c2d33166fd07af2f3efac
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Mar 3 10:21:15 2016 +0100

    Remove unused SIGC_CXX_SELF_REFERENCE_IN_MEMBER_INITIALIZATION() configure check.
    
    Bug #762065 (Kjell Ahlstedt)

 build/cxx.m4               |   26 --------------------------
 configure.ac               |    1 -
 docs/reference/Doxyfile.in |    1 -
 sigc++/type_traits.h       |    2 +-
 sigc++config.h.in          |    4 ----
 5 files changed, 1 insertions(+), 33 deletions(-)
---
diff --git a/build/cxx.m4 b/build/cxx.m4
index 201a561..d66d6d7 100644
--- a/build/cxx.m4
+++ b/build/cxx.m4
@@ -92,32 +92,6 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
 AC_MSG_RESULT([$sigcm_cxx_msvc_template_specialization_operator_overload])
 ])
 
-
-AC_DEFUN([SIGC_CXX_SELF_REFERENCE_IN_MEMBER_INITIALIZATION], [
-AC_MSG_CHECKING([if C++ compiler allows usage of member function in initialization of static member field.])
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
-[[
-  struct test
-  {
-    static char  test_function();
-
-    // Doesn't work with e.g. GCC 3.2.  However, if test_function()
-    // is wrapped in a nested structure, it works just fine.
-    static const bool  test_value
-      = (sizeof(test_function()) == sizeof(char));
-  };
-]],
-[[]])],
-[
-  sigcm_cxx_self_reference_in_member_initialization=yes
-  AC_DEFINE([SIGC_SELF_REFERENCE_IN_MEMBER_INITIALIZATION],[1],
-            [does the C++ compiler allow usage of member function in initialization of static member field.])
-],[
-  sigcm_cxx_self_reference_in_member_initialization=no
-])
-AC_MSG_RESULT([$sigcm_cxx_self_reference_in_member_initialization])
-])
-
 dnl
 dnl SIGC_CXX_PRAGMA_PUSH_POP_MACRO
 dnl
diff --git a/configure.ac b/configure.ac
index fe859e2..5fb4ec6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -52,7 +52,6 @@ MM_ARG_WITH_TAGFILE_DOC([libstdc++.tag], [mm-common-libstdc++])
 AC_LANG([C++])
 SIGC_CXX_GCC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
 SIGC_CXX_MSVC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
-SIGC_CXX_SELF_REFERENCE_IN_MEMBER_INITIALIZATION
 SIGC_CXX_PRAGMA_PUSH_POP_MACRO
 SIGC_CXX_HAS_NAMESPACE_STD
 SIGC_CXX_HAS_SUN_REVERSE_ITERATOR
diff --git a/docs/reference/Doxyfile.in b/docs/reference/Doxyfile.in
index 08a8936..64de25b 100644
--- a/docs/reference/Doxyfile.in
+++ b/docs/reference/Doxyfile.in
@@ -282,7 +282,6 @@ PREDEFINED             = __cplusplus \
                          SIGC_GCC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD \
                          SIGC_HAVE_NAMESPACE_STD \
                          SIGC_MSVC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD \
-                         SIGC_SELF_REFERENCE_IN_MEMBER_INITIALIZATION \
                          SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD \
                          "SIGC_USING_STD(Symbol)="
 EXPAND_AS_DEFINED      = SIGC_WORKAROUND_OPERATOR_PARENTHESES \
diff --git a/sigc++/type_traits.h b/sigc++/type_traits.h
index a4989f0..41b2a41 100644
--- a/sigc++/type_traits.h
+++ b/sigc++/type_traits.h
@@ -19,7 +19,7 @@
 #ifndef _SIGC_TYPE_TRAIT_H_
 #define _SIGC_TYPE_TRAIT_H_
 
-#include <sigc++config.h> //To get SIGC_SELF_REFERENCE_IN_MEMBER_INITIALIZATION
+#include <sigc++config.h>
 
 
 namespace sigc {
diff --git a/sigc++config.h.in b/sigc++config.h.in
index a8f5ac8..1576e03 100644
--- a/sigc++config.h.in
+++ b/sigc++config.h.in
@@ -70,10 +70,6 @@
    calling operator() template methods omitting the template keyword. */
 # undef SIGC_MSVC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
 
-/* does the C++ compiler allow usage of member function in initialization of
-   static member field. */
-# undef SIGC_SELF_REFERENCE_IN_MEMBER_INITIALIZATION
-
 /* does the C++ preprocessor support pragma push_macro() and pop_macro(). */
 # undef SIGC_PRAGMA_PUSH_POP_MACRO