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object.h -Wcast-qual warning #87578

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object.h -Wcast-qual warning#87578
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3.10 (EOL)end of lifeinterpreter-core(Objects, Python, Grammar, and Parser dirs)

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@petere
petere
mannequin
opened on Mar 5, 2021
BPO 43412
Nosy @terryjreedy, @vstinner, @leifwalsh, @petere
Superseder
  • bpo-44378: Py_IS_TYPE(): cast discards ‘const’ qualifier from pointer target type
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = <Date 2021-07-01.00:05:49.727>
created_at = <Date 2021-03-05.22:12:41.593>
labels = ['interpreter-core', '3.10']
title = 'object.h -Wcast-qual warning'
updated_at = <Date 2021-07-01.00:05:49.725>
user = 'https://github.com/petere'

    bugs.python.org fields:

    activity = <Date 2021-07-01.00:05:49.725>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2021-07-01.00:05:49.727>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2021-03-05.22:12:41.593>
creator = 'petere'
dependencies = []
files = []
hgrepos = []
issue_num = 43412
keywords = []
message_count = 5.0
messages = ['388167', '388560', '388607', '396793', '396803']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'vstinner', 'leif.walsh', 'petere']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '44378'
type = None
url = 'https://bugs.python.org/issue43412'
versions = ['Python 3.10']

    Activity

    1. petere commented on Mar 5, 2021

      @petere
      peteremannequin
      on Mar 5, 2021
      MannequinAuthor

      object.h contains an inline function that causes a -Wcast-qual warning from gcc. Since this file ends up visible in third-party code that includes Python.h, this makes it impossible to use -Wcast-qual in such code.

      The problem is the change c5cb077, which replaced ob->ob_type by Py_TYPE(ob), which seems reasonable by itself, but Py_TYPE casts away the const, so it creates this problem.

      This is a regression in Python 3.10.

    2. petere
      added
      3.10 (EOL)end of life
      interpreter-core(Objects, Python, Grammar, and Parser dirs)
      on Mar 5, 2021

    3. terryjreedy commented on Mar 12, 2021

      @terryjreedy
      terryjreedy
      on Mar 12, 2021
      Member

      Victor, the apparent 3.10 regression is from your commit.

    4. vstinner commented on Mar 13, 2021

      @vstinner
      vstinner
      on Mar 13, 2021
      Member

      object.h contains an inline function that causes a -Wcast-qual warning from gcc.

      Which function? Can you please provide the warning?

      Do you want to propose a fix?

    5. leifwalsh commented on Jun 30, 2021

      @leifwalsh
      leifwalshmannequin
      on Jun 30, 2021
      Mannequin

      Duplicated by https://bugs.python.org/issue44378, which has a fix merged.

    6. vstinner commented on Jul 1, 2021

      @vstinner
      vstinner
      on Jul 1, 2021
      Member

      Duplicated by https://bugs.python.org/issue44378, which has a fix merged.

      Right. I close the issue as a duplicate.

    7. vstinner
      closed this as completedon Jul 1, 2021
    8. vstinner
      closed this as completedon Jul 1, 2021
    9. ezio-melotti
      transferred this issue fromon Apr 10, 2022
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