[issue37586] macOS: posix_spawn(..., setsid=True)

[Ronald Oussoren]

Ronald Oussoren  added the comment:

Fixed in bpo-41100.

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dependencies:  -Build failure on macOS 11 (beta)
resolution:  -> fixed
stage: needs patch -> resolved
superseder:  -> Build failure on macOS 11 (beta)

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[issue37586] macOS: posix_spawn(..., setsid=True)

[Ronald Oussoren]

Change by Ronald Oussoren :


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status: open -> closed

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[issue37586] macOS: posix_spawn(..., setsid=True)

[Ronald Oussoren]

Ronald Oussoren  added the comment:

I'm including a fix for this in the active PR on bpo-41100

--
dependencies: +Build failure on macOS 11 (beta)

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[issue37586] macOS: posix_spawn(..., setsid=True)

[Ned Deily]

Ned Deily  added the comment:

The immediate problem is that the version of Xcode you are using supplies a 
MacOSX10.15 SDK by default. Since you are running on 10.14, the test passes if 
you build using a MacOSX10.14 SDK. Either upgrade to 10.15 or grab the 10.14 
SDK from a previous version of Xcode or the Command Line Tools (which is all 
you need to build and test Python) and make that SDK the default.  Ronald's 
patch will eventually fix that but, unless you are building for a newer OS 
version on an older OS version, it is still safest to use the SDK version that 
corresponds to the running system.

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[issue37586] macOS: posix_spawn(..., setsid=True)

[Steve Dower]

Steve Dower  added the comment:

Oh great, it's one of these style changes :)

You probably want to define some macros for those barriers so the added 
optional nesting doesn't come back to bite us later.

Otherwise, best of luck! Let me know if I can help out (for now I'm just 
ignoring the setsid test).

--
versions: +Python 3.10

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[issue37586] macOS: posix_spawn(..., setsid=True)

[Ronald Oussoren]

Ronald Oussoren  added the comment:

That's this issue.

FWIW: I'm slowly working on a patch to build on macOS 11 and deploy to macOS 
10.9 or later, the current rough and untested PR is at 
https://github.com/python/cpython/pull/21583. 

This needs testing and cleanup before it can be considered for merging.

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[issue37586] macOS: posix_spawn(..., setsid=True)

[Steve Dower]

Steve Dower  added the comment:

I just started running into a failure that looks like this on some private 
builds (Xcode_11.3.1 on macOS-10.14.6-x86_64-i386-64bit):

==
FAIL: test_setsid (test.test_posix.TestPosixSpawnP)
--
Traceback (most recent call last):
  File "/Users/runner/work/1/s/Lib/test/test_posix.py", line 1692, in 
test_setsid
self.assertNotEqual(parent_sid, child_sid)
AssertionError: 1 == 1

Is that this issue? Or something else?

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nosy: +steve.dower

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[issue37586] macOS: posix_spawn(..., setsid=True)

[Ronald Oussoren]

Ronald Oussoren  added the comment:

This is not a bug in Xcode 11. Xcode 11 includes definitions for new flags that 
get picked up by Python's build, but only work on a new version of macOS. 

I guess this could be seen as a bug in macOS 10.14 (and earlier) because it 
ignores an unknown flag instead of returning an error.  Knowing Apple that's 
unlikely to get fixed, if it even is a bug 
(
 says that returning EINVAL is optional for an invalid value of "flags").

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[issue37586] macOS: posix_spawn(..., setsid=True)

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

File a bug in Xcode 11?

If it will not be fixed we will need to add a workaround (like checking the 
macOS version explicitly).

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nosy: +serhiy.storchaka

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[issue37586] macOS: posix_spawn(..., setsid=True)

[Ronald Oussoren]

New submission from Ronald Oussoren :

The Xcode 11 beta introduced a definition for POSIX_SPAWN_SETSID, but that flag 
is only supported on macOS 10.15 (also beta), not on earlier versions.

Because of this the testsuite will have failures when you build using Xcode 11 
on macOS 10.14. 

I'm not sure what the best way to patch this is, but lean toward a fix that 
detects the use of setsid=True on macOS 10.14 or earlier and then fails. 
Possibly as part of a larger effort to start supporting building on macOS 
"latest" and running on older versions.

Marked as low priority for now, Xcode 11 is in beta and not used to build 
release binaries.

--
assignee: ronaldoussoren
components: macOS
messages: 347816
nosy: ned.deily, ronaldoussoren
priority: low
severity: normal
stage: needs patch
status: open
title: macOS: posix_spawn(..., setsid=True)
type: behavior
versions: Python 3.8, Python 3.9

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