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ilotoki0804 opened this issue Apr 7, 2025 · 1 comment
Closed

import clr raises RuntimeError when PYTHONOPTIMIZE=2 #2572

ilotoki0804 opened this issue Apr 7, 2025 · 1 comment

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@ilotoki0804
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ilotoki0804 commented Apr 7, 2025 •
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Environment

  • versions 
    cffi-1.17.1
clr_loader-0.2.7.post0
pycparser-2.22
pythonnet-3.0.5
  • Python 3.13.2
  • Windows 11 AMD x64

Details

When the PYTHONOPTIMIZE environment variable is set to 2, running import clr results in a RuntimeError: Failed to create a default .NET runtime... exception. Testing in a sandboxed environment with only Python and pythonnet installed also raised an exception. The exception is not raised when PYTHONOPTIMIZE is lower than 2.

Steps to reproduce

> set PYTHONOPTIMIZE=2
> py
Python 3.13.2 (tags/v3.13.2:4f8bb39, Feb  4 2025, 15:23:48) [MSC v.1942 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import clr
<ENVPATH>\Lib\site-packages\pycparser\c_parser.py:17: RuntimeWarning: parsing methods must have __doc__ for pycparser to work properly
  @template
WARNING: There was a problem loading the table file: KeyError('p_direct_id_declarator_1')
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:508: No documentation string specified in function 'p_translation_unit_or_empty' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:517: No documentation string specified in function 'p_translation_unit_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:523: No documentation string specified in function 'p_translation_unit_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:533: No documentation string specified in function 'p_external_declaration_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:538: No documentation string specified in function 'p_external_declaration_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:543: No documentation string specified in function 'p_external_declaration_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:549: No documentation string specified in function 'p_external_declaration_4' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:554: No documentation string specified in function 'p_external_declaration_5' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:559: No documentation string specified in function 'p_static_assert_declaration' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:568: No documentation string specified in function 'p_pp_directive' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:579: No documentation string specified in function 'p_pppragma_directive' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:591: No documentation string specified in function 'p_pppragma_directive_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:599: No documentation string specified in function 'p_function_definition_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:617: No documentation string specified in function 'p_function_definition_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:632: No documentation string specified in function 'p_statement' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:687: No documentation string specified in function 'p_pragmacomp_or_statement' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:707: No documentation string specified in function 'p_decl_body' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:768: No documentation string specified in function 'p_declaration' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:777: No documentation string specified in function 'p_declaration_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:788: No documentation string specified in function 'p_declaration_specifiers_no_type_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:793: No documentation string specified in function 'p_declaration_specifiers_no_type_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:798: No documentation string specified in function 'p_declaration_specifiers_no_type_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:805: No documentation string specified in function 'p_declaration_specifiers_no_type_4' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:810: No documentation string specified in function 'p_declaration_specifiers_no_type_5' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:815: No documentation string specified in function 'p_declaration_specifiers_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:820: No documentation string specified in function 'p_declaration_specifiers_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:825: No documentation string specified in function 'p_declaration_specifiers_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:830: No documentation string specified in function 'p_declaration_specifiers_4' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:835: No documentation string specified in function 'p_declaration_specifiers_5' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:840: No documentation string specified in function 'p_declaration_specifiers_6' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:845: No documentation string specified in function 'p_declaration_specifiers_7' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:850: No documentation string specified in function 'p_storage_class_specifier' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:860: No documentation string specified in function 'p_function_specifier' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:866: No documentation string specified in function 'p_type_specifier_no_typeid' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:882: No documentation string specified in function 'p_type_specifier' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:892: No documentation string specified in function 'p_atomic_specifier' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:899: No documentation string specified in function 'p_type_qualifier' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:907: No documentation string specified in function 'p_init_declarator_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:916: No documentation string specified in function 'p_init_declarator' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:922: No documentation string specified in function 'p_id_init_declarator_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:928: No documentation string specified in function 'p_id_init_declarator' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:936: No documentation string specified in function 'p_specifier_qualifier_list_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:941: No documentation string specified in function 'p_specifier_qualifier_list_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:946: No documentation string specified in function 'p_specifier_qualifier_list_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:951: No documentation string specified in function 'p_specifier_qualifier_list_4' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:956: No documentation string specified in function 'p_specifier_qualifier_list_5' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:961: No documentation string specified in function 'p_specifier_qualifier_list_6' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:969: No documentation string specified in function 'p_struct_or_union_specifier_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:980: No documentation string specified in function 'p_struct_or_union_specifier_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:998: No documentation string specified in function 'p_struct_or_union_specifier_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1017: No documentation string specified in function 'p_struct_or_union' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1025: No documentation string specified in function 'p_struct_declaration_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1034: No documentation string specified in function 'p_struct_declaration_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1072: No documentation string specified in function 'p_struct_declaration_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1077: No documentation string specified in function 'p_struct_declaration_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1082: No documentation string specified in function 'p_struct_declarator_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1091: No documentation string specified in function 'p_struct_declarator_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1096: No documentation string specified in function 'p_struct_declarator_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1105: No documentation string specified in function 'p_enum_specifier_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1111: No documentation string specified in function 'p_enum_specifier_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1116: No documentation string specified in function 'p_enum_specifier_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1122: No documentation string specified in function 'p_enumerator_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1135: No documentation string specified in function 'p_alignment_specifier' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1141: No documentation string specified in function 'p_enumerator' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1157: No documentation string specified in function 'p_declarator' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1270: No documentation string specified in function 'p_pointer' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1300: No documentation string specified in function 'p_type_qualifier_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1306: No documentation string specified in function 'p_parameter_type_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1315: No documentation string specified in function 'p_parameter_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1335: No documentation string specified in function 'p_parameter_declaration_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1347: No documentation string specified in function 'p_parameter_declaration_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1379: No documentation string specified in function 'p_identifier_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1389: No documentation string specified in function 'p_initializer_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1394: No documentation string specified in function 'p_initializer_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1403: No documentation string specified in function 'p_initializer_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1415: No documentation string specified in function 'p_designation' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1423: No documentation string specified in function 'p_designator_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1429: No documentation string specified in function 'p_designator' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1435: No documentation string specified in function 'p_type_name' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1447: No documentation string specified in function 'p_abstract_declarator_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1455: No documentation string specified in function 'p_abstract_declarator_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1460: No documentation string specified in function 'p_abstract_declarator_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1470: No documentation string specified in function 'p_direct_abstract_declarator_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1474: No documentation string specified in function 'p_direct_abstract_declarator_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1485: No documentation string specified in function 'p_direct_abstract_declarator_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1495: No documentation string specified in function 'p_direct_abstract_declarator_4' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1506: No documentation string specified in function 'p_direct_abstract_declarator_5' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1515: No documentation string specified in function 'p_direct_abstract_declarator_6' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1525: No documentation string specified in function 'p_direct_abstract_declarator_7' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1536: No documentation string specified in function 'p_block_item' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1544: No documentation string specified in function 'p_block_item_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1551: No documentation string specified in function 'p_compound_statement_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1557: No documentation string specified in function 'p_labeled_statement_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1561: No documentation string specified in function 'p_labeled_statement_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1565: No documentation string specified in function 'p_labeled_statement_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1569: No documentation string specified in function 'p_selection_statement_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1573: No documentation string specified in function 'p_selection_statement_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1577: No documentation string specified in function 'p_selection_statement_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1582: No documentation string specified in function 'p_iteration_statement_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1586: No documentation string specified in function 'p_iteration_statement_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1590: No documentation string specified in function 'p_iteration_statement_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1594: No documentation string specified in function 'p_iteration_statement_4' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1599: No documentation string specified in function 'p_jump_statement_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1603: No documentation string specified in function 'p_jump_statement_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1607: No documentation string specified in function 'p_jump_statement_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1611: No documentation string specified in function 'p_jump_statement_4' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1617: No documentation string specified in function 'p_expression_statement' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1624: No documentation string specified in function 'p_expression' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1637: No documentation string specified in function 'p_parenthesized_compound_expression' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1641: No documentation string specified in function 'p_typedef_name' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1645: No documentation string specified in function 'p_assignment_expression' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1659: No documentation string specified in function 'p_assignment_operator' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1674: No documentation string specified in function 'p_constant_expression' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1678: No documentation string specified in function 'p_conditional_expression' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1687: No documentation string specified in function 'p_binary_expression' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1713: No documentation string specified in function 'p_cast_expression_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1717: No documentation string specified in function 'p_cast_expression_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1721: No documentation string specified in function 'p_unary_expression_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1725: No documentation string specified in function 'p_unary_expression_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1732: No documentation string specified in function 'p_unary_expression_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1742: No documentation string specified in function 'p_unary_operator' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1752: No documentation string specified in function 'p_postfix_expression_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1756: No documentation string specified in function 'p_postfix_expression_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1760: No documentation string specified in function 'p_postfix_expression_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1766: No documentation string specified in function 'p_postfix_expression_4' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1775: No documentation string specified in function 'p_postfix_expression_5' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1781: No documentation string specified in function 'p_postfix_expression_6' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1787: No documentation string specified in function 'p_primary_expression_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1791: No documentation string specified in function 'p_primary_expression_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1795: No documentation string specified in function 'p_primary_expression_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1801: No documentation string specified in function 'p_primary_expression_4' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1805: No documentation string specified in function 'p_primary_expression_5' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1813: No documentation string specified in function 'p_offsetof_member_designator' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1827: No documentation string specified in function 'p_argument_expression_list' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1837: No documentation string specified in function 'p_identifier' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1841: No documentation string specified in function 'p_constant_1' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1864: No documentation string specified in function 'p_constant_2' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1881: No documentation string specified in function 'p_constant_3' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1896: No documentation string specified in function 'p_unified_string_literal' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1907: No documentation string specified in function 'p_unified_wstring_literal' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1924: No documentation string specified in function 'p_brace_open' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1930: No documentation string specified in function 'p_brace_close' (ignored)
WARNING: <ENVPATH>\Lib\site-packages\pycparser\c_parser.py:1936: No documentation string specified in function 'p_empty' (ignored)
ERROR: start symbol translation_unit_or_empty undefined
Traceback (most recent call last):
  File "<ENVPATH>\Lib\site-packages\pythonnet\__init__.py", line 73, in _create_runtime_from_spec
    return clr_loader.get_netfx(**params)
           ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "<ENVPATH>\Lib\site-packages\clr_loader\__init__.py", line 166, in get_netfx
    from .netfx import NetFx
  File "<ENVPATH>\Lib\site-packages\clr_loader\netfx.py", line 5, in <module>
    from .ffi import ffi, load_netfx
  File "<ENVPATH>\Lib\site-packages\clr_loader\ffi\__init__.py", line 14, in <module>
    ffi.cdef(cdef)
    ~~~~~~~~^^^^^^
  File "<ENVPATH>\Lib\site-packages\cffi\api.py", line 112, in cdef
    self._cdef(csource, override=override, packed=packed, pack=pack)
    ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<ENVPATH>\Lib\site-packages\cffi\api.py", line 126, in _cdef
    self._parser.parse(csource, override=override, **options)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<ENVPATH>\Lib\site-packages\cffi\cparser.py", line 390, in parse
    self._internal_parse(csource)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "<ENVPATH>\Lib\site-packages\cffi\cparser.py", line 395, in _internal_parse
    ast, macros, csource = self._parse(csource)
                           ~~~~~~~~~~~^^^^^^^^^
  File "<ENVPATH>\Lib\site-packages\cffi\cparser.py", line 337, in _parse
    ast = _get_parser().parse(fullcsource)
          ~~~~~~~~~~~^^
  File "<ENVPATH>\Lib\site-packages\cffi\cparser.py", line 53, in _get_parser
    _parser_cache = pycparser.CParser()
  File "<ENVPATH>\Lib\site-packages\pycparser\c_parser.py", line 109, in __init__
    self.cparser = yacc.yacc(
                   ~~~~~~~~~^
        module=self,
        ^^^^^^^^^^^^
    ...<3 lines>...
        tabmodule=yacctab,
        ^^^^^^^^^^^^^^^^^^
        outputdir=taboutputdir)
        ^^^^^^^^^^^^^^^^^^^^^^^
  File "<ENVPATH>\Lib\site-packages\pycparser\ply\yacc.py", line 3352, in yacc
    raise YaccError('Unable to build parser')
pycparser.ply.yacc.YaccError: Unable to build parser

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    import clr
  File "<ENVPATH>\Lib\site-packages\clr.py", line 6, in <module>
    load()
    ~~~~^^
  File "<ENVPATH>\Lib\site-packages\pythonnet\__init__.py", line 133, in load
    set_runtime_from_env()
    ~~~~~~~~~~~~~~~~~~~~^^
  File "<ENVPATH>\Lib\site-packages\pythonnet\__init__.py", line 114, in set_runtime_from_env
    runtime = _create_runtime_from_spec(spec)
  File "<ENVPATH>\Lib\site-packages\pythonnet\__init__.py", line 82, in _create_runtime_from_spec
    raise RuntimeError(
    ...<5 lines>...
    ) from exc
RuntimeError: Failed to create a default .NET runtime, which would
                    have been "netfx" on this system. Either install a
                    compatible runtime or configure it explicitly via
                    `set_runtime` or the `PYTHONNET_*` environment variables
                    (see set_runtime_from_env).
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filmor commented Apr 7, 2025

Well, you can see quite clearly in the stacktrace that the issue is not with pythonnet (or even the associated clr_loader) but with an upstream library that is itself only used as a transitive dependency. pycparser documents that -OO (the equivalent command line flag) is not supported: eliben/pycparser#445

@filmor filmor closed this as not planned Won't fix, can't repro, duplicate, stale Apr 7, 2025
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