I found this article in the Eclipse forum, just followed those steps and it works for me. I am using Eclipse Indigo 20110615-0604 on Windows with a Cygwin setup.
- Make a new C++ project
- Default options for everything
- Once created, right-click the project and go to “Properties”
- C/C++ Build -> Settings -> Tool Settings -> GCC C++ Compiler -> Miscellaneous -> Other Flags. Put
-std=c++0x(or for newer compiler version
-std=c++11at the end . … instead of GCC C++ Compiler I have also Cygwin compiler
- C/C++ General -> Paths and Symbols -> Symbols -> GNU C++. Click “Add…” and paste
__GXX_EXPERIMENTAL_CXX0X__(ensure to append and prepend two underscores) into “Name” and leave “Value” blank.
- Hit Apply, do whatever it asks you to do, then hit OK.
There is a description of this in the Eclipse FAQ now as well: Eclipse FAQ/C++11 Features.