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gh-156112: Load the ObjC runtime by name when find_library() cannot resolve it #156113

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gh-156112: Load the ObjC runtime by name when find_library() cannot resolve it #156113

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24f2513
Fall back to loading the ObjC runtime by name
clementperon Aug 20, 2026
1f1c09d
Add NEWS entry
clementperon Aug 20, 2026
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13 changes: 8 additions & 5 deletions Lib/_ios_support.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,12 +10,15 @@
else:
# ctypes is available. Load the ObjC library, and wrap the objc_getClass,
# sel_registerName methods
lib = util.find_library("objc")
if lib is None:
# Failed to load the objc library
raise ImportError("ObjC runtime library couldn't be loaded")
# find_library() resolves a system library through the dyld shared cache,
# which needs _dyld_shared_cache_contains_path(); that is unavailable before
# iOS 14, so fall back to the bare name, which dyld resolves by itself.
lib = util.find_library("objc") or "libobjc.dylib"

objc = cdll.LoadLibrary(lib)
try:
objc = cdll.LoadLibrary(lib)
except OSError:
raise ImportError("ObjC runtime library couldn't be loaded")
objc.objc_getClass.restype = c_void_p
objc.objc_getClass.argtypes = [c_char_p]
objc.sel_registerName.restype = c_void_p
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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Library/2026-08-20-13-50-49.gh-issue-156112.yEcma8.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
:mod:`!_ios_support` no longer fails to import when
:func:`ctypes.util.find_library` cannot resolve the ObjC runtime through the
dyld shared cache, as is the case on iOS 13. The runtime is now loaded by name,
which dyld resolves against the cache directly.
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