ctypes dlopen failed when use no-gil mode on Android

Bug report

Bug description:

File "python/lib/python3.14t/platform.py", line 1127, in machine
    return uname().machine
           ~~~~~^^
File "python/lib/python3.14t/platform.py", line 1070, in uname
    release = android_ver().release
              ~~~~~~~~~~~^^
File "python/lib/python3.14t/platform.py", line 596, in android_ver
    from ctypes import CDLL, c_char_p, create_string_buffer
File "python/lib/python3.14t/ctypes/__init__.py", line 553, in <module>
    pythonapi = PyDLL("libpython%d.%d.so" % _sys.version_info[:2])
File "python/lib/python3.14t/ctypes/__init__.py", line 462, in __init__
    self._handle = _dlopen(self._name, mode)
                   ~~~~~~~^^^^^^^^^^^^^^^^^^
OSError: dlopen failed: library "libpython3.14.so" not found

I compiled Python 3.14 with the no-gil mode. In this mode, the Python library file is named 'libpython3.14t.so', but ctypes internally still tries to load 'libpython3.14.so', which causes an error.

CPython versions tested on:

3.14

Operating systems tested on:

Other

Linked PRs

@hugovk

Marking as a release-blocker because it may be quite annoying as we announced the official support of free-threading. @hugovk is there a plan to release 3.14.1 earlier (like other outstanding issues that require another release)?

Is this Android specific?

Yes:

cpython/Lib/ctypes/__init__.py

Lines 550 to 557 in ebf955d

    
           if _os.name == "nt": 
        
               pythonapi = PyDLL("python dll", None, _sys.dllhandle) 
        
           elif _sys.platform == "android": 
        
               pythonapi = PyDLL("libpython%d.%d.so" % _sys.version_info[:2]) 
        
           elif _sys.platform == "cygwin": 
        
               pythonapi = PyDLL("libpython%d.%d.dll" % _sys.version_info[:2]) 
        
           else: 
        
               pythonapi = PyDLL(None)

I think the actual library name is available from sysconfig.

Isn't it also cygwin specific?

Apparently so, but that isn't a supported platform. What they have in common is that they're the only Unix platforms that use a dynamically-linked libpython. Well, I guess iOS does as well, but maybe the PyDLL(None) branch works well enough there. I'll do some experimentation.

Marking as a release-blocker because it may be quite annoying as we announced the official support of free-threading. @hugovk is there a plan to release 3.14.1 earlier (like other outstanding issues that require another release)?

Not as yet, let's come up with a fix first and then assess the impact and whether it can wait. At least this doesn't need to hold up today's 3.15.0a1.

I'll mark it as a "deferred" blocker for now to avoid thinking it's a true blocker.

gh-140041: Fix import of `ctypes` on Android and Cygwin when ABI flag…

pythongh-140041: Fix import of `ctypes` on Android and Cygwin when AB…

[3.13] gh-140041: Fix import of `ctypes` on Android and Cygwin when A…

[3.14] gh-140041: Fix import of `ctypes` on Android and Cygwin when A…

pythongh-140041: Fix import of `ctypes` on Android and Cygwin when AB…

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ctypes dlopen failed when use no-gil mode on Android #140041

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Bug description:

CPython versions tested on:

Operating systems tested on:

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	if _os.name == "nt":
	pythonapi = PyDLL("python dll", None, _sys.dllhandle)
	elif _sys.platform == "android":
	pythonapi = PyDLL("libpython%d.%d.so" % _sys.version_info[:2])
	elif _sys.platform == "cygwin":
	pythonapi = PyDLL("libpython%d.%d.dll" % _sys.version_info[:2])
	else:
	pythonapi = PyDLL(None)

ctypes dlopen failed when use no-gil mode on Android #140041

Description

Bug report

Bug description:

CPython versions tested on:

Operating systems tested on:

Linked PRs

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picnixz commented on Oct 13, 2025

colesbury commented on Oct 13, 2025

mhsmith commented on Oct 13, 2025

picnixz commented on Oct 13, 2025

mhsmith commented on Oct 14, 2025

hugovk commented on Oct 14, 2025

picnixz commented on Oct 14, 2025

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