Re: [Boost-build] Passing <cxxflags>-fPIC with use-project /boost

Subject: Re: [Boost-build] Passing <cxxflags>-fPIC with use-project /boost
From: Vladimir Prus (ghost_at_[hidden])
Date: 2009-05-07 11:08:44

On Thursday 07 May 2009 14:07:30 Martin Dyring-Andersen wrote:
> Hello everybody,
> 
> I have a Jamroot that looks like this:
> 
> project 	:	requirements
> 			<threading>multi
> 			<toolkit>gcc,<address-model>64:<cxxflags>-fPIC
> 	:	build-dir stage
> 	:	default-build release
> ;
> 
> use-project /boost	: dependencies/boost_1_39_0 ;
> use-project /test	: test ;
> 
> and a Jamfile located in test subdirectory that looks like this:
> 
> lib test 	:	[ glob-tree *.cpp ] 
> 		/boost//thread/<link>static 
> 		/boost//date_time/<link>static 
> ;
> 
> Now, to get the static linking to /boost//thread and date_time working I need to pass -fPIC when building with GCC on 64 bit platforms.
> 
> I can see that my own targets in lib sfcg gets compiled with -fPIC, but for some reason the /boost//thread and date_time libraries does not seem to "notice" it.
> 
> Everything will work perfectly if I pass cxxflags=-fPIC as a parameter to bjam on the command line. But I would prefer to cram as many details as possible into the Jamfiles, so I don't have to remember them later on ;-).

cxxflags is so called "free" feature -- which is feature which value is not
interpreted. Such features are not propagated to dependencies, for various
reasons. So, you have to use something like:

                 /boost//thread/<link>static/<cxxflags>-fPIC

- Volodya