commit 9b7fb523a0e7dcbcc1ad93a39aad3971a0db6e97
Author: Hubert Figuière <hub@figuiere.net>
Date:   Thu Apr 30 10:45:28 2015 -0400

    C++11: Check and compile for C++11 and use std::unique_ptr<> in lieu of std::auto_ptr<>
    
    This breaks ABI.

diff --git a/build/ax_cxx_compile_stdcxx_11.m4 b/build/ax_cxx_compile_stdcxx_11.m4
new file mode 100644
index 0000000..af37acd
--- /dev/null
+++ b/build/ax_cxx_compile_stdcxx_11.m4
@@ -0,0 +1,133 @@
+# ============================================================================
+#  http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html
+# ============================================================================
+#
+# SYNOPSIS
+#
+#   AX_CXX_COMPILE_STDCXX_11([ext|noext],[mandatory|optional])
+#
+# DESCRIPTION
+#
+#   Check for baseline language coverage in the compiler for the C++11
+#   standard; if necessary, add switches to CXXFLAGS to enable support.
+#
+#   The first argument, if specified, indicates whether you insist on an
+#   extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
+#   -std=c++11).  If neither is specified, you get whatever works, with
+#   preference for an extended mode.
+#
+#   The second argument, if specified 'mandatory' or if left unspecified,
+#   indicates that baseline C++11 support is required and that the macro
+#   should error out if no mode with that support is found.  If specified
+#   'optional', then configuration proceeds regardless, after defining
+#   HAVE_CXX11 if and only if a supporting mode is found.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
+#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
+#   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 3
+
+m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [
+  template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+    typedef check<check<bool>> right_angle_brackets;
+
+    int a;
+    decltype(a) b;
+
+    typedef check<int> check_type;
+    check_type c;
+    check_type&& cr = static_cast<check_type&&>(c);
+
+    auto d = a;
+])
+
+AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
+  m4_if([$1], [], [],
+        [$1], [ext], [],
+        [$1], [noext], [],
+        [m4_fatal([invalid argument `$1' to AX_CXX_COMPILE_STDCXX_11])])dnl
+  m4_if([$2], [], [ax_cxx_compile_cxx11_required=true],
+        [$2], [mandatory], [ax_cxx_compile_cxx11_required=true],
+        [$2], [optional], [ax_cxx_compile_cxx11_required=false],
+        [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX_11])])dnl
+  AC_LANG_PUSH([C++])dnl
+  ac_success=no
+  AC_CACHE_CHECK(whether $CXX supports C++11 features by default,
+  ax_cv_cxx_compile_cxx11,
+  [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
+    [ax_cv_cxx_compile_cxx11=yes],
+    [ax_cv_cxx_compile_cxx11=no])])
+  if test x$ax_cv_cxx_compile_cxx11 = xyes; then
+    ac_success=yes
+  fi
+
+  m4_if([$1], [noext], [], [dnl
+  if test x$ac_success = xno; then
+    for switch in -std=gnu++11 -std=gnu++0x; do
+      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
+      AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
+                     $cachevar,
+        [ac_save_CXXFLAGS="$CXXFLAGS"
+         CXXFLAGS="$CXXFLAGS $switch"
+         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
+          [eval $cachevar=yes],
+          [eval $cachevar=no])
+         CXXFLAGS="$ac_save_CXXFLAGS"])
+      if eval test x\$$cachevar = xyes; then
+        CXXFLAGS="$CXXFLAGS $switch"
+        ac_success=yes
+        break
+      fi
+    done
+  fi])
+
+  m4_if([$1], [ext], [], [dnl
+  if test x$ac_success = xno; then
+    for switch in -std=c++11 -std=c++0x; do
+      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
+      AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
+                     $cachevar,
+        [ac_save_CXXFLAGS="$CXXFLAGS"
+         CXXFLAGS="$CXXFLAGS $switch"
+         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
+          [eval $cachevar=yes],
+          [eval $cachevar=no])
+         CXXFLAGS="$ac_save_CXXFLAGS"])
+      if eval test x\$$cachevar = xyes; then
+        CXXFLAGS="$CXXFLAGS $switch"
+        ac_success=yes
+        break
+      fi
+    done
+  fi])
+  AC_LANG_POP([C++])
+  if test x$ax_cxx_compile_cxx11_required = xtrue; then
+    if test x$ac_success = xno; then
+      AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.])
+    fi
+  else
+    if test x$ac_success = xno; then
+      HAVE_CXX11=0
+      AC_MSG_NOTICE([No compiler with C++11 support was found])
+    else
+      HAVE_CXX11=1
+      AC_DEFINE(HAVE_CXX11,1,
+                [define if the compiler supports basic C++11 syntax])
+    fi
+
+    AC_SUBST(HAVE_CXX11)
+  fi
+])
diff --git a/configure.ac b/configure.ac
index 90956f1..a44ab05 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,6 +85,7 @@ AC_CHECK_FUNCS([flockfile funlockfile getc_unlocked mkfifo])
 # it is a platform-wide ABI choice.
 
 AC_LANG([C++])
+AX_CXX_COMPILE_STDCXX_11(noext)
 
 AC_CHECK_SIZEOF([wchar_t])
 DK_CHECK_FEATURE([wide stream],
diff --git a/glib/glibmm/objectbase.cc b/glib/glibmm/objectbase.cc
index 140816a..0698da4 100644
--- a/glib/glibmm/objectbase.cc
+++ b/glib/glibmm/objectbase.cc
@@ -46,7 +46,7 @@ namespace Glib
 
 // static data members
 ObjectBase::extra_object_base_data_type ObjectBase::extra_object_base_data;
-std::auto_ptr<Threads::Mutex> ObjectBase::extra_object_base_data_mutex(new Threads::Mutex());
+std::unique_ptr<Threads::Mutex> ObjectBase::extra_object_base_data_mutex(new Threads::Mutex());
 
 ObjectBase::ObjectBase()
 :
diff --git a/glib/glibmm/objectbase.h b/glib/glibmm/objectbase.h
index a3afd83..221836f 100644
--- a/glib/glibmm/objectbase.h
+++ b/glib/glibmm/objectbase.h
@@ -29,7 +29,7 @@
 #include <sigc++/trackable.h>
 #include <typeinfo>
 #include <map> // Needed until the next ABI break.
-#include <memory> // auto_ptr, needed until the next ABI break.
+#include <memory> // unique_ptr, needed until the next ABI break.
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
 extern "C" { typedef struct _GObject GObject; }
@@ -209,10 +209,10 @@ typedef std::map<const ObjectBase*, ExtraObjectBaseData> extra_object_base_data_
 static extra_object_base_data_type extra_object_base_data;
 // ObjectBase instances may be used in different threads.
 // Accesses to extra_object_base_data must be thread-safe.
-// auto_ptr, because we don't want to include glibmm/threads.h in objectbase.h.
+// unique_ptr, because we don't want to include glibmm/threads.h in objectbase.h.
 // threads.h must be the first included file that includes glib.h. That could cause
 // problems in files that directly or indirectly include objectbase.h.
-static std::auto_ptr<Threads::Mutex> extra_object_base_data_mutex;
+static std::unique_ptr<Threads::Mutex> extra_object_base_data_mutex;
 
 public: //  is_derived_() must be public, so that overridden vfuncs and signal handlers can call it via ObjectBase.
 
