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Subject: Re: [Boost-users] boost 1.47: gcc file dependency generation trips over BOOST_PARAMETER_MAX_ARITY
From: Dave Abrahams (dave_at_[hidden])
Date: 2011-09-13 13:56:18

on Mon Sep 05 2011, Ytsen de Boer <> wrote:

> Hi,
> To take care of dependencies in my project using boost, I used to
> invoke gcc with the option -MM.

What does -MM do?

> However, since using boost 1.47, this does not work anymore. The
> precompiler aborts with the message:
> /usr/local/include/boost-1_47/boost/signals2/signal_type.hpp:29:2:
> error: #error This header requires BOOST_PARAMETER_MAX_ARITY to be
> defined as 7 or greater prior to including Boost.Parameter headers
> Because the macro BOOST_PARAMETER_MAX_ARITY plays no role whatsover
> in this invocation of gcc, I think that boost should solve their
> internal problem with the "arity" in some other way.

I don't know what you mean. It defaults to 5, but signals2 apparently
needs support for 7 arguments.

> In the mean time I define the macro in my make rules to generate the
> dependencies, but there it is obviously misplaced (any tips or tricks
> are welcome here).

I don't understand your problem, sorry.

Dave Abrahams
BoostPro Computing

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