> On 14 Jan 2021, at 23:03, Chris Barker via Python-Dev <python-dev@python.org>
> wrote:
>
> Ned,
>
> Thanks -- I'll take further discussion to the python-mac list.
>
> Ronald:
>
> That’s a feature of the framework build. The unix build is exactly the same
> as a unix build on other platform. Adding the same feature to the unix build
> should be possible, but would complicate the build. I have no interest to
> work on this, but would be willing to review PRs,
>
> fair enough.
>
> as long as those aim for feature parity with the framework build. That is,
> both pythonw(1) and python(1) should redirect through an embedded app bundle.
>
> yes, that's what I'm thinking.
>
> Done, just configure “—enable-universalsdk —with-universal-archs=universal2”
> without specifying a framework build.
>
> Excellent, thanks!
>
> Something I would like to work on, but don’t have enough free time for, is an
> alternative installation with an application bundle on the top level instead
> of a framework. Installation would then entail dropping “Python X.Y.app”
> into your application folder, and uninstallation would be to drop the same
> bundle into the bin.
>
> That would be nice -- and would, I think, actually buy us something useful
> from this bundling :-)
To be honest I’d expect that this will also lead to complaining about how this
build is not a unix build ;-)
>
> Just don’t use conda ;-). To be blunt, doing this properly is trivial.
>
> which "this" are you referring to -- and if it's trivial, then why hasn't
> anyone figured out how in multiple conversations over years?
“This” is having a pythonw that’s the same as in framework builds.
I don’t know. I do know that nobody asked questions about this before.
>
> But if it is -- tell us how and maybe we will do it (if it's really trivial,
> maybe even I, with my limited build skills could do it)
For anyone reading along that isn’t familiar with macOS: On macOS a number of
system libraries, and in particular GUI libraries, require that they are used
from an application bundle (‘.app”). For Python we want to be able to just
use the command-line for simple scripts (and testing of more complicated
applications), instead having to build an app bundle every time.
In framework builds this is solved by two changes relative to a unix build:
1. The regular python binary is in
“{sys.prefix}/Resources/Python.app/Contents/MacOS/Python”
2. “{sys.executable}” (or “{sys.prefix}/bin/python3”) is a stub executable that
does nothing but execv[1] the regular python binary. The source of this binary
is in Mac/Tools/pythonw.c
Note: All of this requires using a shared library build (—enable-shared)
because of the way the stub finds sys.prefix.
To add this to the unix build as well requires:
1. Make up a location for the Python.app
2. Change the Makefile(.pre.in) to build the stub executable install files in
their new location, but only when installing on macOS with an —enable-shared
build
3. Tweak the code in pythonw.c to calculate the correct path to Python.app
4. Possibly tweak the calculation of sys.prefix for unix builds, IIRC the
special macOS sauce is enabled for framework builds only
5. Do some debugging because this list is likely incomplete, I typed it from
memory
Ronald
[1] for the pedantically correct: it actually uses posix_spawn in exec mode to
ensure that the correct CPU architecture is used. That’s why “arch -x86_64
python3.9” works when you use the universal2 installer for python 3.9, if we’d
use execv the stub would launch the actual interpreter in native mode.
Ronald
>
> Thanks,
>
> -CHB
>
> --
>
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
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>
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