Robert Ramey wrote:

Clarke, Carus V wrote:

...

Using Boost version 1.43 to compile my project caused the following errors to occur. There are more, but they are essentially the same:

I was able to verify that these were caused by the BOOST_CLASS_VERSION macro appearing on the same line in two or more files included by the file being compiled. Using the BOOST_PP_COUNTER from the preprocessor library as the argument to a #line directive on the line preceding the BOOST_PP_COUNTER macro can be used as a workaround. Another was to disable the MPL assertion in the body of the macro. For class versioning to work for gcc, the BOOST_PP_COUNTER macro has to appear in a header file, and I think it is better to put it in the header files for the classes to be serialized.

Here is a sample of the workaround:

// the next two lines are needed to prevent compile-time errors with gcc #include BOOST_PP_UPDATE_COUNTER() #line BOOST_PP_COUNTER BOOST_CLASS_VERSION(Calculation, 0)

Is there a better way to handle the problem? Is this a bug?

Hmmmm - this will require some thought. The best thing would be to open up a track item for this so it doesn't get forgotten.

Robert Ramey

Hi, This problem has been fixed in the SVN trunk version of boost/serialization/version.hpp. Installing the revised file made the problem go away. Thanks, Carus V. (Bud) Clarke carus.v.clarke@boeing.com