bpo-36085: Enable better DLL resolution on Windows#12302

zooba

https://bugs.python.org/issue36085

zooba

@eryksun It looks like HKEY_PERFORMANCE_DATA delay-loads some DLLs that rely on the old resolution method on AppVeyor (the error code is ERROR_MOD_NOT_FOUND as an HRESULT from MSVC). Have you seen anything like this before? Obviously it's not a problem on other machines, so I wonder if they've misconfigured something.

eryksun

HKEY_PERFORMANCE_DATA is a data-collection API packaged as if it's a predefined handle for a registry key. It scans over "HKLM\System\CurrentControlSet\Services" looking for service or driver configurations that have a "Performance" subkey. This should include a "Library" value with the DLL path and the exported function names for "Open", "Close", and "Collect". The implementation skips over DLLs that fail to load, but apparently it doesn't include an exception handler for when the delay-load helper calls RaiseException(ERROR_SEVERITY_ERROR | (FACILITY_VISUALCPP << 16) | ERROR_MOD_NOT_FOUND, ...).

eryksun

apparently it doesn't include an exception handler for when the delay-load helper calls RaiseException

It does not appear to handle this. I added a spam service key that includes the "Performance" subkey and "Library", "Open", "Close", and "Collect" values. I set the library value to "spam.dll", in which I hard coded the exported Open function to call RaiseException(0xC06D007E, 0, 0, NULL). This crashed the process with the following backtrace, starting from RegEnumValueW up to the unhandled exception filter that calls the Windows Error Reporting service:

ntdll!NtWaitForMultipleObjects
KERNELBASE!WaitForMultipleObjectsEx
KERNELBASE!WaitForMultipleObjects
kernel32!WerpReportFaultInternal
kernel32!WerpReportFault
KERNELBASE!UnhandledExceptionFilter
ntdll!RtlUserThreadStart$filt$0
ntdll!_C_specific_handler
ntdll!RtlpExecuteHandlerForException
ntdll!RtlDispatchException
ntdll!RtlRaiseException
KERNELBASE!RaiseException
spam!Open
advapi32!OpenExtObjectLibrary
advapi32!QueryV1Provider
advapi32!QueryExtensibleData
advapi32!PerfRegQueryValueEx
advapi32!PerfRegEnumValue
KERNELBASE!LocalBaseRegEnumValue
KERNELBASE!RegEnumValueW
advapi32!RegEnumValueWStub

Since it ended up in UnhandledExceptionFilter, which is called from the filter in the thread's entrypoint (RtlUserThreadStart), we know that none of the advapi32 functions handled the exception.

eryksun

we know that none of the advapi32 functions handled the exception.

I took a look at `OpenExtObjectLibrary'::`1'::filt$0, which calls the general perflib filter in advapi32, PerfpExceptionFilter. This in turn calls advapi32's ReportError, which reports an event with ID 1009 that includes the failing service and DLL name. It also adds a value in the "Performance" key named "Disable Performance Counters" with a DWORD value of 1, for subsequent calls, and reports another event with ID 1017 to log this. The filter then returns EXCEPTION_CONTINUE_SEARCH (0), which is why it ends up at the uhandled exception filter and crashes the process.

zooba

So on one hand, it's a system misconfiguration, and on the other, we can't get this change past CI (because they have a misconfigured system).

I guess we have to leave out the set-default call and live with "I'm not sure how my DLLs are going to be resolved" as a policy.

zooba

The Pipelines failure is an unrelated Linux issue, so ignoring the failure to merge.

bedevere-bot

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows8.1 Non-Debug 3.x has failed when building commit 2438cdf.

What do you need to do:

Don't panic.
Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/12/builds/2181) and take a look at the build logs.
Check if the failure is related to this commit (2438cdf) or if it is a false positive.
If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/12/builds/2181

Click to see traceback logs

From https://github.com/python/cpython
 * branch            master     -> FETCH_HEAD
Reset branch 'master'

Could Not Find D:\buildarea\3.x.ware-win81-release\build\Lib\*.pyc
The system cannot find the file specified.
Could Not Find D:\buildarea\3.x.ware-win81-release\build\PCbuild\python*.zip

test_grp skipped -- No module named 'grp'
test_poll skipped -- select.poll not defined
test_crypt skipped -- No module named '_crypt'
test_fcntl skipped -- No module named 'fcntl'
test_zipfile64 skipped -- test requires loads of disk-space bytes and a long time to run
test_posix skipped -- No module named 'posix'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "D:\buildarea\3.x.ware-win81-release\build\lib\ctypes\__init__.py", line 361, in __init__
    self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'D:\temp\tmpcf8nkkte\_sqlite3.dll'. Try using the full path with constructor syntax.
test_anon (ctypes.test.test_anon.AnonTest) ... ok
test_anon_nonmember (ctypes.test.test_anon.AnonTest) ... ok
test_anon_nonseq (ctypes.test.test_anon.AnonTest) ... ok
test_issue31490 (ctypes.test.test_anon.AnonTest) ... ok
test_nested (ctypes.test.test_anon.AnonTest) ... ok
test (ctypes.test.test_array_in_pointer.Test) ... ok
test_2 (ctypes.test.test_array_in_pointer.Test) ... ok
test_bad_length (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_bad_subclass (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_cache (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_classcache (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_from_address (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_from_addressW (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_large_array (ctypes.test.test_arrays.ArrayTestCase) ... skipped 'not enough memory: 2.0G minimum needed'
test_numeric_arrays (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_simple (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_subclass (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_zero_length (ctypes.test.test_arrays.ArrayTestCase) ... ok
test_byval (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_callbacks (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_callbacks_2 (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_longlong_callbacks (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_pointers (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_recursive_as_param (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_shorts (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_struct_return_2H (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_struct_return_8H (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_wchar_parm (ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase) ... ok
test_byval (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_callbacks (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_callbacks_2 (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_longlong_callbacks (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_pointers (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_recursive_as_param (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_shorts (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_struct_return_2H (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_struct_return_8H (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_wchar_parm (ctypes.test.test_as_parameter.AsParamWrapperTestCase) ... ok
test_byval (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_callbacks (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_callbacks_2 (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_longlong_callbacks (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_pointers (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_recursive_as_param (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_shorts (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_struct_return_2H (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_struct_return_8H (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_wchar_parm (ctypes.test.test_as_parameter.BasicWrapTestCase) ... ok
test_anon_bitfields (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_c_wchar (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_longlong (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_mixed_1 (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_mixed_2 (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_mixed_3 (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_mixed_4 (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_multi_bitfields_size (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_nonint_types (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_signed (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_single_bitfield_size (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_uint32 (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_uint32_swap_big_endian (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_uint32_swap_little_endian (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_uint64 (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_ulonglong (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_unsigned (ctypes.test.test_bitfields.BitFieldTest) ... ok
test_ints (ctypes.test.test_bitfields.C_Test) ... ok
test_shorts (ctypes.test.test_bitfields.C_Test) ... ok
test_buffer (ctypes.test.test_buffers.StringBufferTestCase) ... ok
test_buffer_interface (ctypes.test.test_buffers.StringBufferTestCase) ... ok
test_unicode_buffer (ctypes.test.test_buffers.StringBufferTestCase) ... ok
test_unicode_conversion (ctypes.test.test_buffers.StringBufferTestCase) ... ok
test_BSTR (ctypes.test.test_bytes.BytesTest) ... ok
test_c_char (ctypes.test.test_bytes.BytesTest) ... ok
test_c_char_p (ctypes.test.test_bytes.BytesTest) ... ok
test_c_wchar (ctypes.test.test_bytes.BytesTest) ... ok
test_c_wchar_p (ctypes.test.test_bytes.BytesTest) ... ok
test_struct (ctypes.test.test_bytes.BytesTest) ... ok
test_struct_W (ctypes.test.test_bytes.BytesTest) ... ok
test_X (ctypes.test.test_byteswap.Test) ... skipped 'test disabled'
test_endian_double (ctypes.test.test_byteswap.Test) ... ok
test_endian_float (ctypes.test.test_byteswap.Test) ... ok
test_endian_int (ctypes.test.test_byteswap.Test) ... ok
test_endian_longlong (ctypes.test.test_byteswap.Test) ... ok
test_endian_other (ctypes.test.test_byteswap.Test) ... ok
test_endian_short (ctypes.test.test_byteswap.Test) ... ok
test_slots (ctypes.test.test_byteswap.Test) ... ok
test_struct_fields_1 (ctypes.test.test_byteswap.Test) ... ok
test_struct_fields_2 (ctypes.test.test_byteswap.Test) ... ok
test_struct_struct (ctypes.test.test_byteswap.Test) ... ok
test_unaligned_native_struct_fields (ctypes.test.test_byteswap.Test) ... ok
test_unaligned_nonnative_struct_fields (ctypes.test.test_byteswap.Test) ... ok
test_byte (ctypes.test.test_callbacks.Callbacks) ... ok
test_char (ctypes.test.test_callbacks.Callbacks) ... ok
test_char_p (ctypes.test.test_callbacks.Callbacks) ... skipped 'test disabled'
test_double (ctypes.test.test_callbacks.Callbacks) ... ok
test_float (ctypes.test.test_callbacks.Callbacks) ... ok
test_int (ctypes.test.test_callbacks.Callbacks) ... ok
test_issue12483 (ctypes.test.test_callbacks.Callbacks) ... ok
test_issue_7959 (ctypes.test.test_callbacks.Callbacks) ... ok
test_long (ctypes.test.test_callbacks.Callbacks) ... ok
test_longdouble (ctypes.test.test_callbacks.Callbacks) ... ok
test_longlong (ctypes.test.test_callbacks.Callbacks) ... ok
test_pyobject (ctypes.test.test_callbacks.Callbacks) ... ok
test_short (ctypes.test.test_callbacks.Callbacks) ... ok
test_ubyte (ctypes.test.test_callbacks.Callbacks) ... ok
test_uint (ctypes.test.test_callbacks.Callbacks) ... ok
test_ulong (ctypes.test.test_callbacks.Callbacks) ... ok
test_ulonglong (ctypes.test.test_callbacks.Callbacks) ... ok
test_unsupported_restype_1 (ctypes.test.test_callbacks.Callbacks) ... ok
test_unsupported_restype_2 (ctypes.test.test_callbacks.Callbacks) ... ok
test_ushort (ctypes.test.test_callbacks.Callbacks) ... ok
test_callback_large_struct (ctypes.test.test_callbacks.SampleCallbacksTestCase) ... ok
test_callback_register_double (ctypes.test.test_callbacks.SampleCallbacksTestCase) ... ok
test_callback_register_int (ctypes.test.test_callbacks.SampleCallbacksTestCase) ... ok
test_integrate (ctypes.test.test_callbacks.SampleCallbacksTestCase) ... ok
test_issue_8959_a (ctypes.test.test_callbacks.SampleCallbacksTestCase) ... skipped 'could not find libc'
test_issue_8959_b (ctypes.test.test_callbacks.SampleCallbacksTestCase) ... ok
test_byte (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_char (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_char_p (ctypes.test.test_callbacks.StdcallCallbacks) ... skipped 'test disabled'
test_double (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_float (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_int (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_issue12483 (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_issue_7959 (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_long (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_longdouble (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_longlong (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_pyobject (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_short (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_ubyte (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_uint (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_ulong (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_ulonglong (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_unsupported_restype_1 (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_unsupported_restype_2 (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_ushort (ctypes.test.test_callbacks.StdcallCallbacks) ... ok
test_address2pointer (ctypes.test.test_cast.Test) ... ok
test_array2pointer (ctypes.test.test_cast.Test) ... ok
test_bad_type_arg (ctypes.test.test_cast.Test) ... ok
test_char_p (ctypes.test.test_cast.Test) ... ok
test_other (ctypes.test.test_cast.Test) ... ok
test_p2a_objects (ctypes.test.test_cast.Test) ... ok
test_wchar_p (ctypes.test.test_cast.Test) ... ok
test_byte (ctypes.test.test_cfuncs.CFunctions) ... ok
test_byte_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_callwithresult (ctypes.test.test_cfuncs.CFunctions) ... ok
test_double (ctypes.test.test_cfuncs.CFunctions) ... ok
test_double_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_float (ctypes.test.test_cfuncs.CFunctions) ... ok
test_float_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_int (ctypes.test.test_cfuncs.CFunctions) ... ok
test_int_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_long (ctypes.test.test_cfuncs.CFunctions) ... ok
test_long_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_longdouble (ctypes.test.test_cfuncs.CFunctions) ... ok
test_longdouble_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_longlong (ctypes.test.test_cfuncs.CFunctions) ... ok
test_longlong_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_short (ctypes.test.test_cfuncs.CFunctions) ... ok
test_short_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_ubyte (ctypes.test.test_cfuncs.CFunctions) ... ok
test_ubyte_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_uint (ctypes.test.test_cfuncs.CFunctions) ... ok
test_uint_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_ulong (ctypes.test.test_cfuncs.CFunctions) ... ok
test_ulong_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_ulonglong (ctypes.test.test_cfuncs.CFunctions) ... ok
test_ulonglong_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_ushort (ctypes.test.test_cfuncs.CFunctions) ... ok
test_ushort_plus (ctypes.test.test_cfuncs.CFunctions) ... ok
test_void (ctypes.test.test_cfuncs.CFunctions) ... ok
test_byte (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_byte_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_callwithresult (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_double (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_double_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_float (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_float_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_int (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_int_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_long (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_long_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_longdouble (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_longdouble_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_longlong (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_longlong_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_short (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_short_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_ubyte (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_ubyte_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_uint (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_uint_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_ulong (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_ulong_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_ulonglong (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_ulonglong_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_ushort (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_ushort_plus (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_void (ctypes.test.test_cfuncs.stdcallCFunctions) ... ok
test_checkretval (ctypes.test.test_checkretval.Test) ... ok
test_oledll (ctypes.test.test_checkretval.Test) ... ok
test_chararray (ctypes.test.test_delattr.TestCase) ... ok
test_simple (ctypes.test.test_delattr.TestCase) ... ok
test_struct (ctypes.test.test_delattr.TestCase) ... ok
test_GetLastError (ctypes.test.test_errno.Test) ... ok
test_open (ctypes.test.test_errno.Test) ... skipped 'Unable to find C library'
test_find_on_libpath (ctypes.test.test_find.LibPathFindTest) ... skipped 'Test only valid for Linux'
OpenGL libraries:
	 ('GL', 'C:\\Windows\\system32\\OpenGL32.dll')
	 ('GLU', 'C:\\Windows\\system32\\Glu32.dll')
	 ('gle', None)
test_gl (ctypes.test.test_find.Test_OpenGL_libs) ... ok
test_gle (ctypes.test.test_find.Test_OpenGL_libs) ... skipped 'lib_gle not available'
test_glu (ctypes.test.test_find.Test_OpenGL_libs) ... ok
test_shell_injection (ctypes.test.test_find.Test_OpenGL_libs) ... ok
test_abstract (ctypes.test.test_frombuffer.Test) ... ok
test_fortran_contiguous (ctypes.test.test_frombuffer.Test) ... ok
test_from_buffer (ctypes.test.test_frombuffer.Test) ... ok
test_from_buffer_copy (ctypes.test.test_frombuffer.Test) ... ok
test_from_buffer_copy_with_offset (ctypes.test.test_frombuffer.Test) ... ok
test_from_buffer_memoryview (ctypes.test.test_frombuffer.Test) ... ok
test_from_buffer_with_offset (ctypes.test.test_frombuffer.Test) ... ok
test_abstract (ctypes.test.test_funcptr.CFuncPtrTestCase) ... ok
test_basic (ctypes.test.test_funcptr.CFuncPtrTestCase) ... ok
test_dllfunctions (ctypes.test.test_funcptr.CFuncPtrTestCase) ... ok
test_first (ctypes.test.test_funcptr.CFuncPtrTestCase) ... ok
test_structures (ctypes.test.test_funcptr.CFuncPtrTestCase) ... ok
test_byval (ctypes.test.test_functions.FunctionTestCase) ... ok
test_callbacks (ctypes.test.test_functions.FunctionTestCase) ... ok
test_callbacks_2 (ctypes.test.test_functions.FunctionTestCase) ... ok
test_doubleresult (ctypes.test.test_functions.FunctionTestCase) ... ok
test_errors (ctypes.test.test_functions.FunctionTestCase) ... ok
test_floatresult (ctypes.test.test_functions.FunctionTestCase) ... ok
test_intresult (ctypes.test.test_functions.FunctionTestCase) ... ok
test_longdoubleresult (ctypes.test.test_functions.FunctionTestCase) ... ok
test_longlong_callbacks (ctypes.test.test_functions.FunctionTestCase) ... ok
test_longlongresult (ctypes.test.test_functions.FunctionTestCase) ... ok
test_mro (ctypes.test.test_functions.FunctionTestCase) ... ok
test_pointers (ctypes.test.test_functions.FunctionTestCase) ... ok
test_sf1651235 (ctypes.test.test_functions.FunctionTestCase) ... ok
test_shorts (ctypes.test.test_functions.FunctionTestCase) ... ok
test_stringresult (ctypes.test.test_functions.FunctionTestCase) ... ok
test_struct_return_2H (ctypes.test.test_functions.FunctionTestCase) ... ok
test_struct_return_2H_stdcall (ctypes.test.test_functions.FunctionTestCase) ... ok
test_struct_return_8H (ctypes.test.test_functions.FunctionTestCase) ... ok
test_struct_return_8H_stdcall (ctypes.test.test_functions.FunctionTestCase) ... ok
test_voidresult (ctypes.test.test_functions.FunctionTestCase) ... ok
test_wchar_parm (ctypes.test.test_functions.FunctionTestCase) ... ok
test_wchar_result (ctypes.test.test_functions.FunctionTestCase) ... ok
test_incomplete_example (ctypes.test.test_incomplete.MyTestCase) ... ok
test_get (ctypes.test.test_init.InitTest) ... ok
test_c_char_p (ctypes.test.test_internals.ObjectsTestCase) ... ok
test_embedded_structs (ctypes.test.test_internals.ObjectsTestCase) ... ok
test_ints (ctypes.test.test_internals.ObjectsTestCase) ... ok
test_ptr_struct (ctypes.test.test_internals.ObjectsTestCase) ... ok
test_simple_struct (ctypes.test.test_internals.ObjectsTestCase) ... ok
test_xxx (ctypes.test.test_internals.ObjectsTestCase) ... ok
test_cint_array (ctypes.test.test_keeprefs.ArrayTestCase) ... ok
test_X (ctypes.test.test_keeprefs.DeletePointerTestCase) ... skipped 'test disabled'
test_p_cint (ctypes.test.test_keeprefs.PointerTestCase) ... ok
test (ctypes.test.test_keeprefs.PointerToStructure) ... ok
test_ccharp (ctypes.test.test_keeprefs.SimpleTestCase) ... ok
test_cint (ctypes.test.test_keeprefs.SimpleTestCase) ... ok
test_ccharp_struct (ctypes.test.test_keeprefs.StructureTestCase) ... ok
test_cint_struct (ctypes.test.test_keeprefs.StructureTestCase) ... ok
test_struct_struct (ctypes.test.test_keeprefs.StructureTestCase) ... ok
test_qsort (ctypes.test.test_libc.LibTest) ... ok
test_sqrt (ctypes.test.test_libc.LibTest) ... ok
libc_name is None
test_1703286_A (ctypes.test.test_loading.LoaderTest) ... ok
test_1703286_B (ctypes.test.test_loading.LoaderTest) ... ok
test_find (ctypes.test.test_loading.LoaderTest) ... ok
test_load (ctypes.test.test_loading.LoaderTest) ... skipped 'could not find libc'
test_load_dll_with_flags (ctypes.test.test_loading.LoaderTest) ... test_load_library (ctypes.test.test_loading.LoaderTest) ... C:\Windows\system32\kernel32.dll
C:\Windows\system32\user32.dll
ok
test_load_ordinal_functions (ctypes.test.test_loading.LoaderTest) ... ok
test_load_version (ctypes.test.test_loading.LoaderTest) ... skipped 'could not find libc'
test_find (ctypes.test.test_macholib.MachOTest) ... skipped 'OSX-specific test'
test_cast (ctypes.test.test_memfunctions.MemFunctionsTest) ... ok
test_memmove (ctypes.test.test_memfunctions.MemFunctionsTest) ... ok
test_memset (ctypes.test.test_memfunctions.MemFunctionsTest) ... ok
test_overflow (ctypes.test.test_memfunctions.MemFunctionsTest) ... skipped 'test disabled'
test_string_at (ctypes.test.test_memfunctions.MemFunctionsTest) ... ok
test_wstring_at (ctypes.test.test_memfunctions.MemFunctionsTest) ... ok
test_alignments (ctypes.test.test_numbers.NumberTestCase) ... ok
test_bool_from_address (ctypes.test.test_numbers.NumberTestCase) ... skipped 'test disabled'
test_bool_values (ctypes.test.test_numbers.NumberTestCase) ... ok
test_byref (ctypes.test.test_numbers.NumberTestCase) ... ok
test_char_from_address (ctypes.test.test_numbers.NumberTestCase) ... ok
test_default_init (ctypes.test.test_numbers.NumberTestCase) ... ok
test_float_from_address (ctypes.test.test_numbers.NumberTestCase) ... ok
test_float_overflow (ctypes.test.test_numbers.NumberTestCase) ... ok
test_floats (ctypes.test.test_numbers.NumberTestCase) ... ok
test_from_param (ctypes.test.test_numbers.NumberTestCase) ... ok
test_init (ctypes.test.test_numbers.NumberTestCase) ... ok
test_int_from_address (ctypes.test.test_numbers.NumberTestCase) ... ok
test_integers (ctypes.test.test_numbers.NumberTestCase) ... ok
test_perf (ctypes.test.test_numbers.NumberTestCase) ... skipped 'test disabled'
test_signed_values (ctypes.test.test_numbers.NumberTestCase) ... ok
test_sizes (ctypes.test.test_numbers.NumberTestCase) ... ok
test_typeerror (ctypes.test.test_numbers.NumberTestCase) ... ok
test_unsigned_values (ctypes.test.test_numbers.NumberTestCase) ... ok
test_valid_ranges (ctypes.test.test_numbers.NumberTestCase) ... skipped 'test disabled'
test (ctypes.test.test_objects.TestCase) ... ok
test_abstract (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_array_pointers (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_byref_pointer (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_byref_pointerpointer (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_cstrings (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_cw_strings (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_int_pointers (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_issue31311 (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_noctypes_argtype (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_subclasses (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_subclasses_c_wchar_p (ctypes.test.test_parameters.SimpleTypesTestCase) ... ok
test_endian_types (ctypes.test.test_pep3118.Test) ... ok
test_native_types (ctypes.test.test_pep3118.Test) ... ok
test_simple (ctypes.test.test_pickling.PickleTest_0) ... ok
test_struct (ctypes.test.test_pickling.PickleTest_0) ... ok
test_unpickable (ctypes.test.test_pickling.PickleTest_0) ... ok
test_wchar (ctypes.test.test_pickling.PickleTest_0) ... ok
test_simple (ctypes.test.test_pickling.PickleTest_1) ... ok
test_struct (ctypes.test.test_pickling.PickleTest_1) ... ok
test_unpickable (ctypes.test.test_pickling.PickleTest_1) ... ok
test_wchar (ctypes.test.test_pickling.PickleTest_1) ... ok
test_simple (ctypes.test.test_pickling.PickleTest_2) ... ok
test_struct (ctypes.test.test_pickling.PickleTest_2) ... ok
test_unpickable (ctypes.test.test_pickling.PickleTest_2) ... ok
test_wchar (ctypes.test.test_pickling.PickleTest_2) ... ok
test_simple (ctypes.test.test_pickling.PickleTest_3) ... ok
test_struct (ctypes.test.test_pickling.PickleTest_3) ... ok
test_unpickable (ctypes.test.test_pickling.PickleTest_3) ... ok
test_wchar (ctypes.test.test_pickling.PickleTest_3) ... ok
test_simple (ctypes.test.test_pickling.PickleTest_4) ... ok
test_struct (ctypes.test.test_pickling.PickleTest_4) ... ok
test_unpickable (ctypes.test.test_pickling.PickleTest_4) ... ok
test_wchar (ctypes.test.test_pickling.PickleTest_4) ... ok
test_abstract (ctypes.test.test_pointers.PointersTestCase) ... ok
test_basic (ctypes.test.test_pointers.PointersTestCase) ... ok
test_basics (ctypes.test.test_pointers.PointersTestCase) ... ok
test_bug_1467852 (ctypes.test.test_pointers.PointersTestCase) ... ok
test_c_void_p (ctypes.test.test_pointers.PointersTestCase) ... ok
test_callbacks_with_pointers (ctypes.test.test_pointers.PointersTestCase) ... ok
test_change_pointers (ctypes.test.test_pointers.PointersTestCase) ... ok
test_charpp (ctypes.test.test_pointers.PointersTestCase)
Test that a character pointer-to-pointer is correctly passed ... ok
test_from_address (ctypes.test.test_pointers.PointersTestCase) ... ok
test_other (ctypes.test.test_pointers.PointersTestCase) ... ok
test_pass_pointers (ctypes.test.test_pointers.PointersTestCase) ... ok
test_pointer_crash (ctypes.test.test_pointers.PointersTestCase) ... ok
test_pointer_type_name (ctypes.test.test_pointers.PointersTestCase) ... ok
test_pointer_type_str_name (ctypes.test.test_pointers.PointersTestCase) ... ok
test_pointers_bool (ctypes.test.test_pointers.PointersTestCase) ... ok
test (ctypes.test.test_prototypes.ArrayTest) ... ok
test_POINTER_c_char_arg (ctypes.test.test_prototypes.CharPointersTestCase) ... ok
test_c_char_p_arg (ctypes.test.test_prototypes.CharPointersTestCase) ... ok
test_c_void_p_arg (ctypes.test.test_prototypes.CharPointersTestCase) ... ok
test_c_void_p_arg_with_c_wchar_p (ctypes.test.test_prototypes.CharPointersTestCase) ... ok
test_instance (ctypes.test.test_prototypes.CharPointersTestCase) ... ok
test_int_pointer_arg (ctypes.test.test_prototypes.CharPointersTestCase) ... ok
test_paramflags (ctypes.test.test_prototypes.CharPointersTestCase) ... ok
test_POINTER_c_wchar_arg (ctypes.test.test_prototypes.WCharPointersTestCase) ... ok
test_c_wchar_p_arg (ctypes.test.test_prototypes.WCharPointersTestCase) ... ok
test_PyBytes_FromStringAndSize (ctypes.test.test_python_api.PythonAPITestCase) ... ok
test_PyLong_Long (ctypes.test.test_python_api.PythonAPITestCase) ... ok
test_PyOS_snprintf (ctypes.test.test_python_api.PythonAPITestCase) ... ok
test_PyObj_FromPtr (ctypes.test.test_python_api.PythonAPITestCase) ... ok
test_PyString_FromString (ctypes.test.test_python_api.PythonAPITestCase) ... ok
test_pyobject_repr (ctypes.test.test_python_api.PythonAPITestCase) ... ok
test_FloatDivisionError (ctypes.test.test_random_things.CallbackTracbackTestCase) ... ok
test_IntegerDivisionError (ctypes.test.test_random_things.CallbackTracbackTestCase) ... ok
test_TypeErrorDivisionError (ctypes.test.test_random_things.CallbackTracbackTestCase) ... ok
test_ValueError (ctypes.test.test_random_things.CallbackTracbackTestCase) ... ok
test (ctypes.test.test_random_things.call_function_TestCase) ... ok
test_callback (ctypes.test.test_refcounts.AnotherLeak) ... ok
test_1 (ctypes.test.test_refcounts.RefcountTestCase) ... ok
test_refcount (ctypes.test.test_refcounts.RefcountTestCase) ... ok
test_char (ctypes.test.test_repr.ReprTest) ... ok
test_numbers (ctypes.test.test_repr.ReprTest) ... ok
test_from_dll (ctypes.test.test_returnfuncptrs.ReturnFuncPtrTestCase) ... ok
test_from_dll_refcount (ctypes.test.test_returnfuncptrs.ReturnFuncPtrTestCase) ... ok
test_with_prototype (ctypes.test.test_returnfuncptrs.ReturnFuncPtrTestCase) ... ok
test_without_prototype (ctypes.test.test_returnfuncptrs.ReturnFuncPtrTestCase) ... ok
test_compare (ctypes.test.test_simplesubclasses.Test) ... ok
test_ignore_retval (ctypes.test.test_simplesubclasses.Test) ... ok
test_int_callback (ctypes.test.test_simplesubclasses.Test) ... ok
test_int_struct (ctypes.test.test_simplesubclasses.Test) ... ok
test_16 (ctypes.test.test_sizes.SizesTestCase) ... ok
test_32 (ctypes.test.test_sizes.SizesTestCase) ... ok
test_64 (ctypes.test.test_sizes.SizesTestCase) ... ok
test_8 (ctypes.test.test_sizes.SizesTestCase) ... ok
test_size_t (ctypes.test.test_sizes.SizesTestCase) ... ok
test_ssize_t (ctypes.test.test_sizes.SizesTestCase) ... ok
test_char_array (ctypes.test.test_slicing.SlicesTestCase) ... ok
test_char_ptr (ctypes.test.test_slicing.SlicesTestCase) ... ok
test_char_ptr_with_free (ctypes.test.test_slicing.SlicesTestCase) ... ok
test_getslice_cint (ctypes.test.test_slicing.SlicesTestCase) ... ok
test_setslice_cint (ctypes.test.test_slicing.SlicesTestCase) ... ok
test_wchar_ptr (ctypes.test.test_slicing.SlicesTestCase) ... ok
test__POINTER_c_char (ctypes.test.test_stringptr.StringPtrTestCase) ... ok
test__c_char_p (ctypes.test.test_stringptr.StringPtrTestCase) ... ok
test_functions (ctypes.test.test_stringptr.StringPtrTestCase) ... ok
test (ctypes.test.test_strings.StringArrayTestCase) ... ok
test_c_buffer_raw (ctypes.test.test_strings.StringArrayTestCase) ... ok
test_c_buffer_value (ctypes.test.test_strings.StringArrayTestCase) ... ok
test_del_segfault (ctypes.test.test_strings.StringArrayTestCase) ... ok
test_param_1 (ctypes.test.test_strings.StringArrayTestCase) ... ok
test_param_2 (ctypes.test.test_strings.StringArrayTestCase) ... ok
test_basic_strings (ctypes.test.test_strings.StringTestCase) ... skipped 'test disabled'
test_initialized_strings (ctypes.test.test_strings.StringTestCase) ... skipped 'test disabled'
test_perf (ctypes.test.test_strings.StringTestCase) ... skipped 'test disabled'
test_sized_strings (ctypes.test.test_strings.StringTestCase) ... skipped 'test disabled'
test_toolong (ctypes.test.test_strings.StringTestCase) ... skipped 'test disabled'
test (ctypes.test.test_strings.WStringArrayTestCase) ... ok
test_nonbmp (ctypes.test.test_strings.WStringArrayTestCase) ... skipped 'sizeof(wchar_t) is smaller than 4 bytes'
test_basic_wstrings (ctypes.test.test_strings.WStringTestCase) ... skipped 'test disabled'
test_toolong (ctypes.test.test_strings.WStringTestCase) ... skipped 'test disabled'
test_wchar (ctypes.test.test_strings.WStringTestCase) ... ok
test_1_A (ctypes.test.test_struct_fields.StructFieldsTestCase) ... ok
test_1_B (ctypes.test.test_struct_fields.StructFieldsTestCase) ... ok
test_2 (ctypes.test.test_struct_fields.StructFieldsTestCase) ... ok
test_3 (ctypes.test.test_struct_fields.StructFieldsTestCase) ... ok
test_4 (ctypes.test.test_struct_fields.StructFieldsTestCase) ... ok
test___get__ (ctypes.test.test_struct_fields.StructFieldsTestCase) ... ok
test___set__ (ctypes.test.test_struct_fields.StructFieldsTestCase) ... ok
test (ctypes.test.test_structures.PointerMemberTestCase) ... ok
test_none_to_pointer_fields (ctypes.test.test_structures.PointerMemberTestCase) ... ok
test_abstract_class (ctypes.test.test_structures.StructureTestCase) ... ok
test_conflicting_initializers (ctypes.test.test_structures.StructureTestCase) ... ok
test_empty (ctypes.test.test_structures.StructureTestCase) ... ok
test_fields (ctypes.test.test_structures.StructureTestCase) ... ok
test_huge_field_name (ctypes.test.test_structures.StructureTestCase) ... ok
test_init_errors (ctypes.test.test_structures.StructureTestCase) ... ok
test_initializers (ctypes.test.test_structures.StructureTestCase) ... ok
test_intarray_fields (ctypes.test.test_structures.StructureTestCase) ... ok
test_invalid_field_types (ctypes.test.test_structures.StructureTestCase) ... ok
test_invalid_name (ctypes.test.test_structures.StructureTestCase) ... ok
test_keyword_initializers (ctypes.test.test_structures.StructureTestCase) ... ok
test_methods (ctypes.test.test_structures.StructureTestCase) ... ok
test_nested_initializers (ctypes.test.test_structures.StructureTestCase) ... ok
test_packed (ctypes.test.test_structures.StructureTestCase) ... ok
test_packed_c_limits (ctypes.test.test_structures.StructureTestCase) ... ok
test_pass_by_value (ctypes.test.test_structures.StructureTestCase) ... ok
test_pass_by_value_in_register (ctypes.test.test_structures.StructureTestCase) ... ok
test_positional_args (ctypes.test.test_structures.StructureTestCase) ... ok
test_simple_structs (ctypes.test.test_structures.StructureTestCase) ... ok
test_struct_alignment (ctypes.test.test_structures.StructureTestCase) ... ok
test_structures_with_wchar (ctypes.test.test_structures.StructureTestCase) ... ok
test_subclass_creation (ctypes.test.test_structures.StructureTestCase) ... skipped 'test disabled'
test_unions (ctypes.test.test_structures.StructureTestCase) ... ok
test_subclass (ctypes.test.test_structures.SubclassesTest) ... ok
test_subclass_delayed (ctypes.test.test_structures.SubclassesTest) ... ok
test_contains_itself (ctypes.test.test_structures.TestRecursiveStructure) ... ok
test_vice_versa (ctypes.test.test_structures.TestRecursiveStructure) ... ok
test_native (ctypes.test.test_unaligned_structures.TestStructures) ... ok
test_swapped (ctypes.test.test_unaligned_structures.TestStructures) ... ok
test_buffers (ctypes.test.test_unicode.StringTestCase) ... ok
test_func (ctypes.test.test_unicode.StringTestCase) ... ok
test_wcslen (ctypes.test.test_unicode.StringTestCase) ... ok
test_buffers (ctypes.test.test_unicode.UnicodeTestCase) ... ok
test_wcslen (ctypes.test.test_unicode.UnicodeTestCase) ... ok
test_frozentable (ctypes.test.test_values.PythonValuesTestCase) ... ok
test_optimizeflag (ctypes.test.test_values.PythonValuesTestCase) ... ok
test_undefined (ctypes.test.test_values.PythonValuesTestCase) ... ok
test_an_integer (ctypes.test.test_values.ValuesTestCase) ... ok
test_undefined (ctypes.test.test_values.ValuesTestCase) ... ok
test_array_invalid_length (ctypes.test.test_varsize_struct.VarSizeTest) ... ok
test_resize (ctypes.test.test_varsize_struct.VarSizeTest) ... ok
test_zerosized_array (ctypes.test.test_varsize_struct.VarSizeTest) ... ok
test_SEH (ctypes.test.test_win32.FunctionCallTestCase) ... ok
test_noargs (ctypes.test.test_win32.FunctionCallTestCase) ... ok
test_sizes (ctypes.test.test_win32.ReturnStructSizesTestCase) ... ok
test_struct_by_value (ctypes.test.test_win32.Structures) ... ok
test_winerror (ctypes.test.test_win32.TestWinError) ... ok
test_COMError (ctypes.test.test_win32.TestWintypes) ... ok
test_HWND (ctypes.test.test_win32.TestWintypes) ... ok
test_PARAM (ctypes.test.test_win32.TestWintypes) ... ok
test_variant_bool (ctypes.test.test_wintypes.WinTypesTest) ... ok

======================================================================
ERROR: test_load_dll_with_flags (ctypes.test.test_loading.LoaderTest) [WinDLL(nt._getfullpathname('_sqlite3.dll'), winmode=nt._LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR)]
----------------------------------------------------------------------
Traceback (most recent call last):
  File "D:\buildarea\3.x.ware-win81-release\build\lib\ctypes\test\test_loading.py", line 140, in should_pass
    subprocess.check_output(
  File "D:\buildarea\3.x.ware-win81-release\build\lib\subprocess.py", line 396, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "D:\buildarea\3.x.ware-win81-release\build\lib\subprocess.py", line 488, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['D:\\buildarea\\3.x.ware-win81-release\\build\\PCbuild\\amd64\\python.exe', '-c', "from ctypes import *; import nt;WinDLL(nt._getfullpathname('_sqlite3.dll'), winmode=nt._LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR)"]' returned non-zero exit status 1.

----------------------------------------------------------------------

Ran 473 tests in 0.972s

FAILED (errors=1, skipped=25)
test test_ctypes failed
test_devpoll skipped -- test works only on Solaris OS family
test_ossaudiodev skipped -- No module named 'ossaudiodev'
test_pty skipped -- No module named 'termios'
test_readline skipped -- No module named 'readline'
test_multiprocessing_fork skipped -- fork is not available on Windows
test_multiprocessing_forkserver skipped -- forkserver is not available on Windows
test_ioctl skipped -- No module named 'fcntl'
test_gdb skipped -- Couldn't find gdb on the path
test_pwd skipped -- No module named 'pwd'
test_spwd skipped -- No module named 'spwd'
test_kqueue skipped -- test works only on BSD
test_syslog skipped -- No module named 'syslog'
test_openpty skipped -- os.openpty() not available.
test_wait4 skipped -- object <module 'os' from 'D:\\buildarea\\3.x.ware-win81-release\\build\\lib\\os.py'> has no attribute 'fork'
test_nis skipped -- No module named 'nis'
test_xxtestfuzz skipped -- No module named '_xxtestfuzz'
test_curses skipped -- No module named '_curses'
test_epoll skipped -- test works only on Linux 2.6
test_pipes skipped -- pipes module only works on posix
test_dbm_gnu skipped -- No module named '_gdbm'
test_threadsignals skipped -- Can't test signal on win32
test_dbm_ndbm skipped -- No module named '_dbm'
test_fork1 skipped -- object <module 'os' from 'D:\\buildarea\\3.x.ware-win81-release\\build\\lib\\os.py'> has no attribute 'fork'
test_resource skipped -- No module named 'resource'
test_wait3 skipped -- os.fork not defined
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "D:\buildarea\3.x.ware-win81-release\build\lib\ctypes\__init__.py", line 361, in __init__
    self._handle = _dlopen(self._name, mode)
FileNotFoundError: Could not find module 'D:\temp\tmpdgnmxkoc\_sqlite3.dll'. Try using the full path with constructor syntax.
test test_ctypes failed

Could Not Find D:\buildarea\3.x.ware-win81-release\build\PCbuild\python*.zip

…#5146 This is also a problem with meson which tries to execute things in the build directory using the build directory DLLs by prepending those to PATH. Since meson uses a Python helper the PATH gets updated to include the system prefix first which makes things link against the installed libraries instead and fail because symbols are missing. One of the reasons why this was added in the first place is that Python loads C extensions in lib-dynload which then can't find the libraries in prefix (e.g. "import tkinter") if it isn't in PATH. By moving the prefix at the end of PATH we make both cases work. Starting with Python 3.8 C extensions will no longer use PATH for loading DLL dependencies, see python/cpython#12302 so we will have to look into this again then.

…5146 This is also a problem with meson which tries to execute things in the build directory using the build directory DLLs by prepending those to PATH. Since meson uses a Python helper the PATH gets updated to include the system prefix first which makes things link against the installed libraries instead and fail because symbols are missing. One of the reasons why this was added in the first place is that Python loads C extensions in lib-dynload which then can't find the libraries in prefix (e.g. "import tkinter") if it isn't in PATH. By moving the prefix at the end of PATH we make both cases work. Starting with Python 3.8 C extensions will no longer use PATH for loading DLL dependencies, see python/cpython#12302 so we will have to look into this again then.

…rch path for the DLLs (see python/cpython#12302)

bpo-36085: Enable better DLL resolution on Windows

dd55a5f

zooba added OS-windows DO-NOT-MERGE labels Mar 13, 2019

the-knights-who-say-ni added the CLA signed label Mar 13, 2019

bedevere-bot added the awaiting merge label Mar 13, 2019

eryksun reviewed Mar 13, 2019

View reviewed changes

zooba added 2 commits March 13, 2019 09:25

Improves error handling

b01f83b

Improve ctypes error message and enables adjacent dependency loading

51ade83

eryksun reviewed Mar 14, 2019

View reviewed changes

zooba added 5 commits March 14, 2019 07:58

Remove invalid ctypes flag

e8b54a4

Merge remote-tracking branch 'cpython/master' into bpo-36085

98db2ef

Merge remote-tracking branch 'cpython/master' into bpo-36085

49b757b

Fix uninitialised variable

ae48b59

Add NEWS and make nicer interface for add_dll_directory

3f29c0a

zooba closed this Mar 18, 2019

zooba reopened this Mar 18, 2019

zooba added 7 commits March 21, 2019 08:49

Add after_test step to collect more info

e022bb8

Change to on_finish

56fa1bd

Attempt a workaround for the test

c50b0ea

Try a broader workaround

4fd36e4

Handle errors in workaround

88ef129

Test retrieving specific counter instead of all counters

34614af

Remove default DLL directory setting

8311618

eryksun reviewed Mar 27, 2019

View reviewed changes

mattip reviewed Mar 28, 2019

View reviewed changes

zooba added 4 commits March 28, 2019 09:59

Improve documentation

4a1c712

Improve error handling

1af7230

Merge remote-tracking branch 'cpython/master' into bpo-36085

864c34e

Fix calling convention for 32-bit builds

6ae0b6f

zooba removed the DO-NOT-MERGE label Mar 28, 2019

zooba added 3 commits March 29, 2019 15:37

Adds import test

7cf3055

Ensure CRT DLLs are copied for test

6b1d038

Remove trailing whitespace

a9f7ae0

zooba merged commit 2438cdf into python:master Mar 29, 2019

bedevere-bot removed the awaiting merge label Mar 29, 2019

zooba deleted the bpo-36085 branch March 29, 2019 23:38

lazka mentioned this pull request Apr 16, 2019

python3: append prefix to PATH instead of prepending it. Fixes #5146 msys2/MINGW-packages#5223

Merged

jjhelmus mentioned this pull request Oct 15, 2019

python v3.8.0 conda-forge/python-feedstock#274

Merged

3 tasks

michael-k mentioned this pull request Oct 28, 2019

Run tests against Python 3.8 redis/hiredis-py#93

Merged

alalek mentioned this pull request Dec 10, 2019

python: fix issue with bindings loading on Python 3.8 opencv/opencv#16120

Merged

jobovy added a commit to jobovy/galpy that referenced this pull request Mar 18, 2020

Fix DLL loading on Windows in ctypes Python 3.8 by using a looser sea… …

00ea6cf

…rch path for the DLLs (see python/cpython#12302)

zooba mentioned this pull request Sep 7, 2022

Enable better DLL resolution #80266

Closed

vtjnash mentioned this pull request Dec 12, 2022

Try LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32 | LOAD_LIBRARY_SEARCH_USER_DIRS for DLL loading on Windows JuliaLang/julia#47775

Open

jiasli mentioned this pull request Dec 26, 2022

{Packaging} Bump PyWin32 to 305 Azure/azure-cli#24982

Merged

mattip mentioned this pull request Apr 24, 2024

(untested) Win32: CFFI: pass the flags from dlopen() to LoadLibraryEx() pypy/pypy#4911

Closed

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bpo-36085: Enable better DLL resolution on Windows#12302

bpo-36085: Enable better DLL resolution on Windows#12302
zooba merged 30 commits into
python:masterfrom
zooba:bpo-36085

zooba commented Mar 13, 2019 •

edited by bedevere-bot

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eryksun commented Mar 19, 2019 •

edited

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zooba commented Mar 19, 2019

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zooba commented Mar 20, 2019

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bedevere-bot commented Mar 29, 2019

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zooba commented Mar 13, 2019 •

edited by bedevere-bot

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eryksun commented Mar 19, 2019 •

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