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Add extern "C" around PyTraceMalloc_ functions.#127772

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vstinner merged 1 commit intopython:mainfrom
hawkinsp:externc
Dec 11, 2024
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Add extern "C" around PyTraceMalloc_ functions.#127772
vstinner merged 1 commit intopython:mainfrom
hawkinsp:externc

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@hawkinsp hawkinsp commented Dec 9, 2024

Pretty much everything else exported by Python.h has an extern "C" annotation, yet this header appears to be missing one.

(Noticed because numpy/numpy@7124091 added an extern "C" around its include of <Python.h>, which should have been a no-op but wasn't in all cases.)

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ghost commented Dec 9, 2024 •
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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@Eclips4 Eclips4 requested a review from vstinner December 9, 2024 20:21
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LGTM.

How do we feel about backporting?

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LGTM. But please remove the two empty lines to be consistent with other header files.

@vstinner vstinner added needs backport to 3.12 only security fixes needs backport to 3.13 bugs and security fixes labels Dec 10, 2024
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ZeroIntensity commented Dec 10, 2024

I don't think this affects 3.12

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vstinner commented Dec 10, 2024

I don't think this affects 3.12

Python 3.12 is also affected, but the code is different.

@hawkinsp
Add extern "C" around PyTraceMalloc_ functions.
36dbfba 
Pretty much everything else exported by Python.h has an extern "C"
annotation, yet this header appears to be missing one.
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hawkinsp commented Dec 10, 2024

LGTM.

How do we feel about backporting?

No strong opinions from my end. I was able to work around the problem. But I wanted to make sure to fix the issue upstream.

@vstinner vstinner merged commit 2cdeb61 into python:main Dec 11, 2024
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miss-islington-app bot commented Dec 11, 2024

Thanks @hawkinsp for the PR, and @vstinner for merging it 🌮🎉.. I'm working now to backport this PR to: 3.12, 3.13.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Dec 11, 2024
@hawkinsp @miss-islington
Add extern "C" around PyTraceMalloc_ functions. (pythonGH-127772)
a16429b 
Pretty much everything else exported by Python.h has an extern "C"
annotation, yet this header appears to be missing one.
(cherry picked from commit 2cdeb61)

Co-authored-by: Peter Hawkins <hawkinsp@cs.stanford.edu>
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miss-islington-app bot commented Dec 11, 2024

Sorry, @hawkinsp and @vstinner, I could not cleanly backport this to 3.12 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 2cdeb61b57e638ae46a04386330a12abe9cddf2c 3.12

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bedevere-app bot commented Dec 11, 2024

GH-127815 is a backport of this pull request to the 3.13 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.13 bugs and security fixes label Dec 11, 2024
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bedevere-bot commented Dec 11, 2024

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 RHEL8 LTO + PGO 3.x has failed when building commit 2cdeb61.

What do you need to do:

  1. Don't panic.
  2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
  3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/78/builds/8019) and take a look at the build logs.
  4. Check if the failure is related to this commit (2cdeb61) or if it is a false positive.
  5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/78/builds/8019

Summary of the results of the build (if available):

==

Click to see traceback logs 
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/threading.py", line 1054, in _bootstrap_inner
    self.run()
    ~~~~~~~~^^
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/threading.py", line 996, in run
    self._target(*self._args, **self._kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/test/test_interpreters/test_stress.py", line 30, in task
    interp = interpreters.create()
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/test/support/interpreters/__init__.py", line 76, in create
    id = _interpreters.create(reqrefs=True)
interpreters.InterpreterError: interpreter creation failed
k

vstinner pushed a commit to vstinner/cpython that referenced this pull request Dec 11, 2024
@hawkinsp @vstinner
Add extern "C" around PyTraceMalloc_ functions. (python#127772)
ae58d9d 
Pretty much everything else exported by Python.h has an extern "C"
annotation, yet this header appears to be missing one.

(cherry picked from commit 2cdeb61)
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bedevere-app bot commented Dec 11, 2024

GH-127817 is a backport of this pull request to the 3.12 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.12 only security fixes label Dec 11, 2024
vstinner pushed a commit that referenced this pull request Dec 11, 2024
@miss-islington @hawkinsp
[3.13] Add extern "C" around PyTraceMalloc_ functions. (GH-127772) (
78dfc28 
#127815)

Add `extern "C"` around `PyTraceMalloc_` functions. (GH-127772)

Pretty much everything else exported by Python.h has an extern "C"
annotation, yet this header appears to be missing one.
(cherry picked from commit 2cdeb61)

Co-authored-by: Peter Hawkins <hawkinsp@cs.stanford.edu>
vstinner added a commit that referenced this pull request Dec 11, 2024
@vstinner @hawkinsp
[3.12] Add extern "C" around PyTraceMalloc_ functions. (#127772) (#…
65bca19 
…127817)

Add `extern "C"` around `PyTraceMalloc_` functions. (#127772)

Pretty much everything else exported by Python.h has an extern "C"
annotation, yet this header appears to be missing one.

(cherry picked from commit 2cdeb61)

Co-authored-by: Peter Hawkins <hawkinsp@cs.stanford.edu>
hawkinsp added a commit to hawkinsp/numpy that referenced this pull request Dec 12, 2024
@hawkinsp
[BUG] Don't wrap #include <Python.h with extern "C".
dfdd419 
This exposed a latent bug in CPython
(python/cpython#127772), but it's probably not a
good practice in general to wrap other code's headers with extern
guards.
hawkinsp added a commit to hawkinsp/numpy that referenced this pull request Dec 12, 2024
@hawkinsp
[BUG] Don't wrap #include <Python.h> with extern "C".
6405aea 
This extern block was recently moved, which exposed a latent bug in CPython
(python/cpython#127772), but it's probably not a
good practice in general to wrap other code's headers with extern
guards.
@hawkinsp hawkinsp mentioned this pull request Dec 12, 2024
Merged
seberg pushed a commit to numpy/numpy that referenced this pull request Dec 12, 2024
@hawkinsp
MAINT: Don't wrap #include <Python.h> with extern "C"
c1e8a0e 
This extern block was recently moved, which exposed a latent bug in CPython
(python/cpython#127772), but it's probably not a
good practice in general to wrap other code's headers with extern
guards.
charris pushed a commit to charris/numpy that referenced this pull request Dec 12, 2024
@hawkinsp @charris
MAINT: Don't wrap #include <Python.h> with extern "C"
a7ad8fe 
This extern block was recently moved, which exposed a latent bug in CPython
(python/cpython#127772), but it's probably not a
good practice in general to wrap other code's headers with extern
guards.
charris pushed a commit to charris/numpy that referenced this pull request Dec 12, 2024
@hawkinsp @charris
MAINT: Don't wrap #include <Python.h> with extern "C"
531565c 
This extern block was recently moved, which exposed a latent bug in CPython
(python/cpython#127772), but it's probably not a
good practice in general to wrap other code's headers with extern
guards.
@charris charris mentioned this pull request Dec 12, 2024
Merged
srinivasreddy pushed a commit to srinivasreddy/cpython that referenced this pull request Jan 8, 2025
@hawkinsp @srinivasreddy
Add extern "C" around PyTraceMalloc_ functions. (python#127772)
a851d0f 
Pretty much everything else exported by Python.h has an extern "C"
annotation, yet this header appears to be missing one.
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