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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Python built with clang -O0 allocates 10x more stack memory than clang -O3 on a Python function call","articleBody":"BPO | [46600](https://bugs.python.org/issue46600)\n--- | :---\nNosy | @vstinner, @methane, @corona10, @pablogsal\nPRs | \u003cli\u003epython/cpython#31052\u003c/li\u003e\u003cli\u003epython/cpython#31058\u003c/li\u003e\nFiles | \u003cli\u003e[stack_overflow-4.py](https://bugs.python.org/file50600/stack_overflow-4.py \"Uploaded as text/plain at 2022-02-01.13:40:57 by @vstinner\")\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = None\ncreated_at = \u003cDate 2022-02-01.13:06:00.875\u003e\nlabels = ['3.11', 'build', 'performance']\ntitle = 'Python built with clang -O0 allocates 10x more stack memory than clang -O3 on a Python function call'\nupdated_at = \u003cDate 2022-02-03.00:00:28.611\u003e\nuser = 'https://github.com/vstinner'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2022-02-03.00:00:28.611\u003e\nactor = 'methane'\nassignee = 'none'\nclosed = False\nclosed_date = None\ncloser = None\ncomponents = ['Build']\ncreation = \u003cDate 2022-02-01.13:06:00.875\u003e\ncreator = 'vstinner'\ndependencies = []\nfiles = ['50600']\nhgrepos = []\nissue_num = 46600\nkeywords = ['patch']\nmessage_count = 14.0\nmessages = ['412252', '412253', '412254', '412255', '412256', '412258', '412260', '412261', '412278', '412286', '412294', '412334', '412348', '412407']\nnosy_count = 4.0\nnosy_names = ['vstinner', 'methane', 'corona10', 'pablogsal']\npr_nums = ['31052', '31058']\npriority = 'normal'\nresolution = None\nstage = 'patch review'\nstatus = 'open'\nsuperseder = None\ntype = 'performance'\nurl = 'https://bugs.python.org/issue46600'\nversions = ['Python 3.11']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2022-02-01T13:06:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":16},"url":"https://github.com/90758/cpython/issues/90758"}