[boost] [Build] Specify compiler on the command line

Subject: [boost] [Build] Specify compiler on the command line
From: Louis Dionne (ldionne.2_at_[hidden])
Date: 2015-10-15 14:13:17

Hi,

Still attempting to setup Boost.Build for Hana, I find myself unable to 
specify the compiler to be used by `b2` on the command line. The system
compiler is then used by default, which does not work because I need to
test on recent compilers.

This can be handled by writing a project-config.jam file with the following 
in it:

    import feature ;

    if ! clang in [ feature.values <toolset> ]
    {
        using clang : : /path/to/clang ;
    }

However, this is not very script-friendly, and I wonder whether there's a way
to specify it on the command-line instead.

Regards,
Louis