AMDG On 12/08/2017 08:00 PM, Stefan Seefeld via Boost wrote:
On 08.12.2017 21:52, Steven Watanabe via Boost wrote:
<snip> 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 : ... ; } else { 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 `bin.v2/libs/python` 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. In Christ, Steven Watanabe