Re: [Boost-build] c++-std-version

Subject: Re: [Boost-build] c++-std-version
From: Vicente J. Botet Escriba (vicente.botet_at_[hidden])
Date: 2012-10-22 13:00:25

Le 22/10/12 10:54, Alexander Arhipenko a écrit :
> Folks,
>
> I would like to request addition of the c++-std-version feature to
> builtin module and also correspondent compiler modules.
>
> Do you think it's reasonable?
>
> Now feature will have 2 values: 98 and 11.
> When <c++-std-version>11 is set for pre-C++11 compiler -
> it should be simply ignored.
>
> Motivation:
> We are building our source code base for gcc 4.1.2 and gcc 4.4.6.
> We would like to use c++11 features when possible.
> "When possible" will be detected using preprocessor,
> what we need is to pass '-std=c++0x' conditionally -
> when gcc version is equal or greater than 4.3.
> The toolset-agnostic approach could be:
>
>     project /foo
>        : requirements
>          <c++-std-version>11
>        ;
>
>
Hi,

people use to configure their toolset as follows

using gcc : 4.7.1-c++98  : /usr/gcc-4.7.1/bin/g++-4.7 ;
using gcc : 4.7.1-c++11  : /usr/gcc-4.7.1/bin/g++-4.7 : 
<cxxflags>-std="c++11" ;

I agree however that it could be useful the build system adds a new 
feature that can be tested on the jamfiles to make some build conditional.

Best,
Vicente