[3.13] gh-156112: Load the ObjC runtime by name when find_library() c… · python/cpython@fe4c50b · GitHub

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miss-islington

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clementperon

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

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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+12-5Lines changed: 12 additions & 5 deletions

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• Lib
  • _ios_support.py
• Misc/NEWS.d/next/Library
  • 2026-08-20-13-50-49.gh-issue-156112.yEcma8.rst

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‎Lib/_ios_support.py‎

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+8-5Lines changed: 8 additions & 5 deletions

Original file line number	Diff line number	Diff line change
@@ -10,12 +10,15 @@
10	10	else:
11	11	# ctypes is available. Load the ObjC library, and wrap the objc_getClass,
12	12	# sel_registerName methods
13		- lib = util.find_library("objc")
14		- if lib is None:
15		- # Failed to load the objc library
16		- raise ImportError("ObjC runtime library couldn't be loaded")
	13	+ # find_library() resolves a system library through the dyld shared cache,
	14	+ # which needs _dyld_shared_cache_contains_path(); that is unavailable before
	15	+ # iOS 14, so fall back to the bare name, which dyld resolves by itself.
	16	+ lib = util.find_library("objc") or "libobjc.dylib"
17	17
18		- objc = cdll.LoadLibrary(lib)
	18	+ try:
	19	+ objc = cdll.LoadLibrary(lib)
	20	+ except OSError:
	21	+ raise ImportError("ObjC runtime library couldn't be loaded")
19	22	objc.objc_getClass.restype = c_void_p
20	23	objc.objc_getClass.argtypes = [c_char_p]
21	24	objc.sel_registerName.restype = c_void_p

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‎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 @@
	1	+ :mod:`!_ios_support` no longer fails to import when
	2	+ :func:`ctypes.util.find_library` cannot resolve the ObjC runtime through the
	3	+ dyld shared cache, as is the case on iOS 13. The runtime is now loaded by name,
	4	+ which dyld resolves against the cache directly.

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