I found that it was not necessary to define these when building boost, but I'm not 100% sure whether that is necessary, I think that depends on which non-header only library use these macros, perhaps you could do a quick search of the boost directory just to make sure.

2012/2/22 Igor R <boost.lists@gmail.com>

>> You can get around this by increasing the maximum size a variant can handle,
>> define the following symbols (or higher if you need):
>>
>> #define BOOST_MPL_LIMIT_LIST_SIZE 30
>> #define BOOST_MPL_LIMIT_VECTOR_SIZE 30
>> #define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS

And one more question: if I define these macros in some TU of my
project, in the way that affects some other boost headers I include --
should I define them when building boost as well?

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