Subject: Re: [boost] [release] Boost 1.66.0 Beta 1 Release Candidate 1
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2017-12-09 03:12:48
On 12/08/2017 08:00 PM, Stefan Seefeld via Boost wrote:
> On 08.12.2017 21:52, Steven Watanabe via Boost wrote:
>> import feature ;
>> feature.feature python-version : 3 : propagated optional ;
>> import modules ;
>> import toolset ;
>> # Allow command line switching
>> if --use-python3 in [ modules.peek : ARGV ]
>> project : requirements <python-version>3 ;
>> using python : 3.xx : ... ;
>> using python : 2.xx : ... ;
> Can you elaborate a bit on what this will achieve ? It seems this simply
> means the same user-config.jam file can be reused for two `b2`
> invocations (one with `--use-python3` and one without). But the build
> logic would still need to be augmented to:
> 1) run `b2` as before
> 2) remove the build tree for Boost.Python, i.e. everything under
> 3) rerun `b2`, this time with additional `--use-python3 --with-python`
> arguments, to only rebuild Boost.Python, this time with Python3.
> 4) collect all binaries from the staging area during packaging.
> Correct ?
Step (2) is not necessary. python-version is specifically
to avoid this step, by forcing the python3 build to
use a different build directory.