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[3.13] gh-156112: Load the ObjC runtime by name when find_library() cannot resolve it (GH-156113) #156217

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Merged
freakboy3742 merged 1 commit into from
Aug 22, 2026
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[3.13] gh-156112: Load the ObjC runtime by name when find_library() cannot resolve it (GH-156113) #156217

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gh-156112: Load the ObjC runtime by name when find_library() cannot r… 
…esolve it (GH-156113)

Provides a fallback name for the ObjC runtime library on iOS, and improved error
handling when that library cannot be loaded.
(cherry picked from commit 918fb3a)

Co-authored-by: Clément Péron <peron.clem@gmail.com>
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@clementperon @miss-islington
clementperon authored and miss-islington committed Aug 22, 2026
commit 783e33880dbb072be4f4327e4a4f7d64dbec3f87
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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