Simplify the C++11 check

configure.ac

@@ -6,9 +6,8 @@ AM_SILENT_RULES([yes])
 
 AC_LANG([C++])
 AC_PROG_CXX([clang++ g++])
+CXXFLAGS="$CXXFLAGS -std=gnu++11"
 AC_PROG_CXXCPP
-m4_include([m4/ax_cxx_compile_stdcxx_11.m4])
-AX_CXX_COMPILE_STDCXX_11()
 AC_PROG_RANLIB
 AC_PROG_INSTALL
 IT_PROG_INTLTOOL([0.40.0])

dist/debian/copyright

@@ -15,10 +15,6 @@ Copyright:
     For everything not noted below:
       Copyright (C) 2010-2013 Alexander Kojevnikov
 
-    For m4/ax_cxx_compile_stdcxx_11.m4:
-      Copyright (C) 2008 Benjamin Kosnik
-      Copyright (C) 2012 Zack Weinberg
-
     For src/spek-pipeline.c:
       Copyright (C) 2010-2012 Alexander Kojevnikov
       Copyright (C) 2007-2009 Sebastian Dröge

dist/osx/README.md

@@ -2,7 +2,7 @@
 
 Using [MacPorts](http://www.macports.org/) install build dependencies:
 
-    port install git-core autoconf automake intltool upx yasm.
+    port install autoconf automake clang-3.2 git-core intltool upx yasm.
 
 Download and build wxWidgets 2.9+, example configure flags:
 

m4/ax_cxx_compile_stdcxx_11.m4

@@ -1,107 +0,0 @@
-# ============================================================================
-#  http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html
-# ============================================================================
-#
-# SYNOPSIS
-#
-#   AX_CXX_COMPILE_STDCXX_11([ext|noext])
-#
-# DESCRIPTION
-#
-#   Check for baseline language coverage in the compiler for the C++11
-#   standard; if necessary, add switches to CXXFLAGS to enable support.
-#   Errors out if no mode that supports C++11 baseline syntax can be found.
-#   The 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.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
-#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
-#
-#   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 1
-
-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);
-])
-
-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
-  AC_LANG_ASSERT([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 $switch"
-        ac_success=yes
-        break
-      fi
-    done
-  fi])
-
-  if test x$ac_success = xno; then
-    AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.])
-  fi
-])