Re: [boost] Did Boost 1.59.0 change the meaning of "using python : 3.4 : ..." in user-config.jam?

Subject: Re: [boost] Did Boost 1.59.0 change the meaning of "using python : 3.4 : ..." in user-config.jam?
From: Jonathan Wakely (jwakely.boost_at_[hidden])
Date: 2015-08-24 12:02:05

On 24 August 2015 at 16:57, Jonathan Wakely wrote:
> On 24 August 2015 at 10:15, Vladimir Prus wrote:
>> Maybe "using python : 2.7" was previously added by bootstrap.sh. If you
>> still have
>> 1.58 conveniently available, could you run bootstrap.sh and compare the
>> generated
>> project-config.jam with the one in 1.59?
>
> Aha, good thinking:
>
> --- boost_1_58_0/project-config.jam     2015-08-24 16:54:41.177750798 +0100
> +++ boost_1_59_0/project-config.jam     2015-08-24 16:55:03.936748390 +0100
> @@ -15,7 +15,11 @@
> project : default-build <toolset>gcc ;
>
> # Python configuration
> -using python : 2.7 : /usr ;
> +import python ;
> +if ! [ python.configured ]
> +{
> +    using python : 2.7 : /usr ;
> +}
>
> path-constant ICU_PATH : /usr ;
>
> So with 1.59.0 the python-2.7 config is only added if
> python.configured is true, but it used to be there unconditionally.

Oops, sorry, of course it's only added if it's *false* :-)