gcc 4.2 on MacOSX 10.8 defines __cplusplus==1, but does not support C++11; refs #11

src/mrw/checkcxx11.hxx

@@ -12,21 +12,26 @@
 // otherwise there is a fallback wich makes everything much more compliacted
 #  ifndef MRW__OLD_PRE11_COMPILER
 #    if __cplusplus < 201103L
-// #      if __APPLE__
-//          /// Code is compiled with an old non C++11 standard compliant compiler
-//          /** There are workarounds for old non C++11 compatible
-//              compilers. These workarounds are deprecated, but will remain until
-//              most compilers fully support C++11. So this workaround will be
-//              removed in future releases, when support for C++11 is more
-//              common. Only rely on this workaround, if you really have to. */
-// #        warning you need a C++11 compliant compiler, on gcc: add -std=c++11
-// #        warning to emulate C++11, on gcc: add -DMRW__OLD_PRE11_COMPILER
-// #        warning refere to the library documentation for more details
-// #      elif __cplusplus==1
 #      if __cplusplus==1
+#        if __APPLE__
+           /// Code is compiled with old non C++11 standard compliant compiler
+           /** There are workarounds for old non C++11 compatible
+               compilers. These workarounds are deprecated, but will
+               remain until most compilers fully support C++11. So
+               this workaround will be removed in future releases,
+               when support for C++11 is more common. Only rely on
+               this workaround, if you really have to.
+               Mac gcc is even worse than on other systems. */
+#          define MRW__OLD_PRE11_COMPILER
+#          warning you need a C++11 compliant compiler, on gcc: add -std=c++11
+#          warning emulating C++11 - this changes the way you use the library
+#          warning this is deprecated and will be removed in future releases
+#          warning refere to the library documentation for more details
+#        else
            // __cplusplus==1 is a known bug in gcc 4.6.3
 #          warning your compiler has a know bug, please upgrade to gcc >= 4.7
 #          warning see __cplusplus in http://gcc.gnu.org/gcc-4.7/changes.html
+#        fi
 #      else
          /// Code is compiled with an old non C++11 standard compliant compiler
          /** There are workarounds for old non C++11 compatible