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Method Py_FrozenMain missing in libpython3.9 #86757

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Method Py_FrozenMain missing in libpython3.9#86757
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3.10 (EOL)end of life3.9 (EOL)end of lifestdlibStandard Library Python modules in the Lib/ directory

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@chba
chba
mannequin
opened on Dec 7, 2020
BPO 42591
Nosy @vstinner, @encukou, @pablogsal, @miss-islington
PRs
  • bpo-42591: Export missing Py_FrozenMain() symbol #23730
  • [3.9] bpo-42591: Export missing Py_FrozenMain() symbol (GH-23730) #23734
  • bpo-43795: Remove Py_FrozenMain from the Limited API & Stable ABI  #26241
  • [3.10] bpo-43795: Remove Py_FrozenMain from the Limited API & Stable ABI (GH-26241) #26353
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    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 2020-12-14.23:33:30.176>
created_at = <Date 2020-12-07.16:00:33.880>
labels = ['library', '3.9', '3.10']
title = 'Method Py_FrozenMain missing in libpython3.9'
updated_at = <Date 2021-05-25.11:59:25.858>
user = 'https://bugs.python.org/chba'

    bugs.python.org fields:

    activity = <Date 2021-05-25.11:59:25.858>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-14.23:33:30.176>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2020-12-07.16:00:33.880>
creator = 'chba'
dependencies = []
files = []
hgrepos = []
issue_num = 42591
keywords = ['patch']
message_count = 15.0
messages = ['382651', '382817', '382818', '382819', '382829', '382835', '382836', '383021', '383022', '383121', '383123', '383154', '383156', '393878', '394333']
nosy_count = 5.0
nosy_names = ['vstinner', 'petr.viktorin', 'chba', 'pablogsal', 'miss-islington']
pr_nums = ['23730', '23734', '26241', '26353']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42591'
versions = ['Python 3.9', 'Python 3.10']

    Activity

    1. chba commented on Dec 7, 2020

      @chba
      chbamannequin
      on Dec 7, 2020
      MannequinAuthor
      In Python 3.9.0 and 3.9.1rc1 (Packages from Ubuntu Devel Branch or Fedora) the Method
int Py_FrozenMain(int, char**)
is missing in libpython3.9.so

      Thus, when trying the provided freeze example via
      freeze.py hello.py & make
      one gets the linker error
      /usr/bin/ld: frozen.o: in function main': frozen/frozen.c:681: undefined reference to Py_FrozenMain' .

      In previous Python 3.8.x the bug does not show.

      Thanks,
      Chris

    2. chba
      added
      topic-C-API
      3.9 (EOL)end of life
      stdlibStandard Library Python modules in the Lib/ directory
      and removed
      topic-C-API
      on Dec 7, 2020

    3. chba commented on Dec 10, 2020

      @chba
      chbamannequin
      on Dec 10, 2020
      MannequinAuthor

      The same under Python 3.9.1 (Package from Debian bullseye/testing). As the method Py_FrozenMain is contained in the source code, maybe ist has something to do with the build process, a change in makefile? As far as I can see, the builder of the distribution packages call the makefile as provided.

      Chris

    4. chba commented on Dec 10, 2020

      @chba
      chbamannequin
      on Dec 10, 2020
      MannequinAuthor

      The file containing the source code is Python/frozenmain.c .

    5. vstinner commented on Dec 10, 2020

      @vstinner
      vstinner
      on Dec 10, 2020
      Member

      I wrote PR 23730 to fix the issue. Would it be possible for you to test it?

      Since Python 3.9, symbols which are not explicitly exported are no longer exported. Python now uses -fvisibility=hidden.

    6. chba commented on Dec 10, 2020

      @chba
      chbamannequin
      on Dec 10, 2020
      MannequinAuthor

      Dear Victor,

      a simple test with the tools/freeze/hello.py example was successfull with your patch and the newest cpython from github.

      1. git clone https://github.com/python/cpython.git
      2. Applied a patch of your pull request
        3        . configure, make, amke install to xxx
      3. freeze.py wants wants this for a very long time:
        ln -s /usr/local/lib/python3.10/config-3.10-x86_64-linux-gnu
        /usr/local/lib/python3.10/config-3.10
      4. python3 cpython/Tools/freeze.py -o frozen hello.py
      5. cd frozen; make; ./hello
        Helo world...

      Thanks again,
      Chris

    7. vstinner commented on Dec 10, 2020

      @vstinner
      vstinner
      on Dec 10, 2020
      Member

      New changeset b5c7b38 by Victor Stinner in branch 'master':
      bpo-42591: Export missing Py_FrozenMain() symbol (GH-23730)
      b5c7b38

    8. vstinner commented on Dec 10, 2020

      @vstinner
      vstinner
      on Dec 10, 2020
      Member

      a simple test with the tools/freeze/hello.py example was successfull with your patch and the newest cpython from github.

      Oh great, thanks for your quick feedback! I applied your PR to master and I will backport it to 3.9.

    9. vstinner commented on Dec 14, 2020

      @vstinner
      vstinner
      on Dec 14, 2020
      Member

      New changeset 6b2ed38 by Victor Stinner in branch '3.9':
      bpo-42591: Export missing Py_FrozenMain() symbol (GH-23730) (GH-23734)
      6b2ed38

    10. vstinner commented on Dec 14, 2020

      @vstinner
      vstinner
      on Dec 14, 2020
      Member

      Thanks Christian Bachmaier for the bug report, it's now fixed.

    11. vstinner
      added
      3.10 (EOL)end of life
      on Dec 14, 2020
    12. vstinner
      closed this as completedon Dec 14, 2020
    13. vstinner
      added
      3.10 (EOL)end of life
      on Dec 14, 2020
    14. vstinner
      closed this as completedon Dec 14, 2020

    15. vstinner commented on Dec 16, 2020

      @vstinner
      vstinner
      on Dec 16, 2020
      Member

      Christian Bachmaier:

      Thus, when trying the provided freeze example via
      freeze.py hello.py & make

      Do you mean freeze.py from Tools/freeze/freeze.py? This tool seems to be broken for 4 years, since Python 3.6: bpo-42613.

      1. freeze.py wants wants this for a very long time:
        ln -s /usr/local/lib/python3.10/config-3.10-x86_64-linux-gnu
        /usr/local/lib/python3.10/config-3.10

      Oh, you fixed manually freeze.py?

    16. chba commented on Dec 16, 2020

      @chba
      chbamannequin
      on Dec 16, 2020
      MannequinAuthor

      Do you mean freeze.py from Tools/freeze/freeze.py?

      Yes, unfortunately I have to keep a large old system running and there are only few options left. It is a University learning system, where students upload program code and then a huge amount of automtic quality checks are executed within a sandbox. The grading is done in a half automtic way. A real alternative is not existing, we tried hard to find one...

      This tool seems to
      be broken for 4 years, since Python 3.6: bpo-42613.
      4. freeze.py wants wants this for a very long time:
      ln -s /usr/local/lib/python3.10/config-3.10-x86_64-linux-gnu
      /usr/local/lib/python3.10/config-3.10

      The symlink does the trick. So it may be easy for you to fix that, so it does operate out of the box again.

    17. vstinner commented on Dec 16, 2020

      @vstinner
      vstinner
      on Dec 16, 2020
      Member

      Christian Bachmaier:

      The symlink does the trick. So it may be easy for you to fix that, so it does operate out of the box again.

      I pushed a fix in bpo-42613. It would be great if you could test it.

      See my manual test: https://bugs.python.org/issue42613#msg383153

      If you can test it, I can backport the fix to stable branches.

    18. chba commented on Dec 16, 2020

      @chba
      chbamannequin
      on Dec 16, 2020
      MannequinAuthor

      Vistor Stinner:

      If you can test it, I can backport the fix to stable branches.

      Seems to work like a charm. Basically I used the same testing setup as previously on Dec 10th under Debian testing/bullseye without step 2, as master already contains your fix.

      Victor, many thanks again, you are great!

    19. encukou commented on May 18, 2021

      @encukou
      encukou
      on May 18, 2021
      Member

      Is this function actually usable in Windows? ISTM that you need to define three more functions, PyWinFreeze_ExeInit, PyWinFreeze_ExeTerm and PyInitFrozenExtensions.

      Was adding this undocumented function to the Windows stable ABI deliberate? I see no discussion about that.

    20. pablogsal commented on May 25, 2021

      @pablogsal
      pablogsal
      on May 25, 2021
      Member

      New changeset 68b9c20 by Miss Islington (bot) in branch '3.10':
      bpo-43795: Remove Py_FrozenMain from the Limited API & Stable ABI (GH-26241) (GH-26353)
      68b9c20

    21. ezio-melotti
      transferred this issue fromon Apr 10, 2022
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