[MacPorts] #63532: py-tensorflow @2.6.0 on M1: Architecture confusion for dependencies

[MacPorts]

#63532: py-tensorflow @2.6.0 on M1: Architecture confusion for dependencies
--------------------+---------------------------
 Reporter:  p-bro   |      Owner:  emcrisostomo
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.7.1
 Keywords:          |       Port:  py-tensorflow
--------------------+---------------------------
 When attempting to install the py-tensorflow port on MacOS 11.6 on M1,
 {{{port install py-tensorflow}}} command bails out with the following
 error:
 {{{
 Error: Cannot install py39-tensorflow for the arch 'x86_64' because
 Error: its dependency bazel-3.7 does not build for the required arch by
 default
 Error: and does not have a universal variant.
 Error: Follow https://guide.macports.org/#project.tickets if you believe
 there is a bug.
 Error: Processing of port py-tensorflow failed
 }}}
 A full log is attached. For some reason ports is confused about the
 architecture it's running on: At no point I requested the x86_64
 architecture. All my configuration files are the default.

 Directly requesting the py39 version with the command {{{port install
 py39-tensorflow}}} does not have this issue and proceeds to install
 dependencies in the correct architectures.

 I encountered the bug on py-tensorflow, but there may be something more
 fundamental going on here, and the bug may actually be with base.

-- 
Ticket URL: <https://trac.macports.org/ticket/63532>
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