Re: [Boost-users] boost 1.47: gcc file dependency generation trips over BOOST_PARAMETER_MAX_ARITY

on Thu Sep 15 2011, Ivan Le Lann wrote:

----- "Ytsen de Boer" a écrit:

...

Thank you for your answer. I believe we are not on the same page. Obviously, when I define the max arity to a value of 7 or more, the preprocessor will finish properly.

But the point I am trying to make is more subtle, namely, that the generation of the project dependencies has not a thing to do with the boost max arity.

I think it does actually. How could gcc track inclusions without preprocessing ?

#ifdef USE_LIB_A # include "a.h" #else # include "b.h" #endif

It seems very dangerous to me to use "-MMD" with different preprocessor definitions than at real compile time. But I'm not an expert.

Maybe not, but you've hit the nail on the head.

...

I don't know what the boost max arity means or what its for, but it seems to me that it is a run time variable.

It couldn't possibly be a runtime variable. It's a preprocessor macro, and runtime variables can't affect preprocessing. -- Dave Abrahams BoostPro Computing http://www.boostpro.com