[issue29605] platform.architecture() with Python2.7-32 misreports architecture on macOS.

[Marc-Andre Lemburg]

Marc-Andre Lemburg added the comment:

Ok, thanks for the clarification. So if I understand correctly, the main change 
in Python 3 is that points to the stub launcher, not the binary itself.

In any case, a new function would have to be added to the platform module to 
query multiple architectures available in a binary and probably another one to 
return the architecture that Python runs.

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[issue29605] platform.architecture() with Python2.7-32 misreports architecture on macOS.

[Ned Deily]

Ned Deily added the comment:

> AFAIK, the Python 3 binaries available from python.org are no longer built as 
> universal binaries, so the problem doesn't show with those.

All python.org Mac binaries are built as universal. For example:

$ file /usr/local/bin/python3.6
/usr/local/bin/python3.6: Mach-O universal binary with 2 architectures: [i386: 
Mach-O executable i386] [x86_64: Mach-O 64-bit executable x86_64]
/usr/local/bin/python3.6 (for architecture i386):   Mach-O executable i386
/usr/local/bin/python3.6 (for architecture x86_64): Mach-O 64-bit 
executable x86_64

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[issue29605] platform.architecture() with Python2.7-32 misreports architecture on macOS.

[Marc-Andre Lemburg]

Marc-Andre Lemburg added the comment:

Thanks for the report, but there really isn't much we can do, since the API is 
not geared up for handling executables which contain binaries for multiple 
architectures.

AFAIK, the Python 3 binaries available from python.org are no longer built as 
universal binaries, so the problem doesn't show with those.

--
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue29605] platform.architecture() with Python2.7-32 misreports architecture on macOS.

[Ned Deily]

Ned Deily added the comment:

platform.architecture() is documented as giving unreliable results with macOS 
universal files; see 
https://docs.python.org/2/library/platform.html#platform.architecture.  The 
difference in behavior between Python 2.7 and 3.x for the example you show is 
due to the difference in the value of sys.executable between them on macOS.  On 
2.7, sys.executable points to the actual Python interpreter binary, which is a 
universal binary.  On 3.x, the behavior was changed to not to resolve to the 
interpreter binary but rather the stub launcher binary and the "-32" launcher 
has only 32-bit executables:

$ /usr/local/bin/python2.7-32 -c 'import sys;print(sys.executable)'
/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
$ /usr/local/bin/python3.6-32 -c 'import sys;print(sys.executable)'
/usr/local/bin/python3.6-32

Because platform.architecture() uses the "file" utility to examine the contents 
of the file pointed to by sys.executable, this change in 3.x has the side 
effect of producing the expected "32bit" value on 3.x when Python is invoked in 
this manner.

However, that doesn't cover all cases.  For example:

$ arch -i386 /usr/local/bin/python3.6 -c 'import 
sys,platform;print(platform.architecture(), sys.maxsize > 2**32)'
('64bit', '') False

So the 3.x platform.architecture can still produce incorrect results.  One can 
argue about what value(s) platform.architecture() should return for 
multi-architecture binaries; languishing Issue10735 covers that.  One could 
also argue that the value of sys.executable on 2.7 should be changed to behave 
like 3.x but it's very late in the life of 2.7 to be making a change like that 
and that change alone would not produce correct results for all cases, like 
"arch -i386" above.

--
assignee:  -> lemburg
nosy: +lemburg
title: Python2.7-32 misreports architecture on macOS. -> 
platform.architecture() with Python2.7-32 misreports architecture on macOS.

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