Library compatibility between C++11 and C++03

Question

I am developing an application in C++11, using g++-4.7 and -std=c++0x.
My app is linked against some shared library compiled with g++-4.7, but without the -std=c++0x di

Answer 1

The standard library has changed, and the -std=c++0x compiler flag will determine what part of the library is in use. By trying to use both versions in the same program you are breaking the One Definition Rule (for each used element in the standard library you have two definitions for the same identifier).

I don't think there is anything simple that can be done to overcome this limitation. You would have to ensure that you only use one version of the library (i.e. define the appropriate macros before inclusion of standard headers to disable C++11 inside those libraries), and even then I am not sure that the generated code would still not break the ODR (if the C++11 extensions compile the C++03 library code differently).