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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"gh-146393 bytecodes.c parsing fails with different encodings","articleBody":"# Bug report\n\n### Bug description:\n\nI’m not sure whether this is a general issue or something specific to my environment, but today I’m unable to build JIT using `PCbuild\\build.bat --experimental-jit`.\n\nAfter bisecting, I found that the problem appears after this commit was merged:\nhttps://github.com/python/cpython/commit/95cbd4a232d9a68680059a0cb42e3f0d2994e206\nBelow are the error logs and a screenshot. (My system language is Chinese, so MSVC does not output English messages sorry about that)\n\n\u003cdetails\u003e\n\u003csummary\u003eBuild log\u003c/summary\u003e\n\n```\nPS E:\\cpython\u003e PCbuild\\build.bat --experimental-jit\nUsing \"E:\\cpython\\PCbuild\\\\..\\externals\\pythonx86\\tools\\python.exe\" (found in externals directory)\nFetching external libraries...\nbzip2-1.0.8 already exists, skipping.\nmpdecimal-4.0.0 already exists, skipping.\nsqlite-3.50.4.0 already exists, skipping.\nxz-5.8.1.1 already exists, skipping.\nzlib-ng-2.2.4 already exists, skipping.\nzstd-1.5.7 already exists, skipping.\nFetching external binaries...\nlibffi-3.4.4 already exists, skipping.\nopenssl-bin-3.5.5 already exists, skipping.\ntcltk-8.6.15.0 already exists, skipping.\nllvm-21.1.4.0 already exists, skipping.\nFinished.\nUsing \"D:\\Microsoft Visual Studio\\MSBuild\\Current\\Bin\\msbuild.exe\" (found in the Visual Studio installation)\nUsing \"E:\\cpython\\PCbuild\\\\..\\externals\\pythonx86\\tools\\python.exe\" (found in externals directory)\n\nE:\\cpython\u003e\"D:\\Microsoft Visual Studio\\MSBuild\\Current\\Bin\\msbuild.exe\" \"E:\\cpython\\PCbuild\\pcbuild.proj\" /t:Build /m /nologo /v:m /clp:summary /p:Configuration=Release /p:Platform=x64 /p:IncludeExternals=true /p:IncludeCTypes=true /p:IncludeSSL=true /p:IncludeTkinter=true /p:DisableGil= /p:UseTestMarker= /p:GIT=\"C:\\Program Files\\Git\\cmd\\git.exe\" /p:UseJIT=true /p:UseTIER2=1 /p:PyStats= /p:UseTailCallInterp= /p:DisableRemoteDebug= /p:StackRefDebug= /p:UsePymallocHugepages=   \n\n  _freeze_module.vcxproj -\u003e E:\\cpython\\PCbuild\\win32\\_freeze_module.exe\n  zlib-ng.vcxproj -\u003e E:\\cpython\\PCbuild\\amd64\\zlib-ng.lib\n  Killing any running python.exe instances...\n  Regenerate Global Objects\n  # not changed: E:\\cpython\\Include\\internal\\pycore_global_strings.h\n  # not changed: E:\\cpython\\Include\\internal\\pycore_runtime_init_generated.h\n  # not changed: E:\\cpython\\Include\\internal\\pycore_unicodeobject_generated.h\n  # not changed: E:\\cpython\\Include\\internal\\pycore_global_objects_fini_generated.h\n\n  =============================================================\n  JIT support for x86_64-pc-windows-msvc is still experimental!\n             Please report any issues you encounter.\n  =============================================================\n\n  Regenerate cases\n  Traceback (most recent call last):\n    File \"E:\\cpython\\Tools\\cases_generator\\opcode_id_generator.py\", line 61, in \u003cmodule\u003e\n      data = analyze_files(args.input)\n    File \"E:\\cpython\\Tools\\cases_generator\\analyzer.py\", line 1424, in analyze_files\n      return analyze_forest(parser.parse_files(filenames))\n                            ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^\n    File \"E:\\cpython\\Tools\\cases_generator\\parser.py\", line 46, in parse_files\n      src = file.read()\n  UnicodeDecodeError: 'gbk' codec can't decode byte 0x94 in position 33327: illegal multibyte sequence\n\nE:\\cpython\\PCbuild\\regen.targets(97,5): error MSB3073: Command \"\"E:\\cpython\\PCbuild\\\\..\\externals\\pythonx86\\tools\\python.exe\"\n Tools\\cases_generator\\opcode_id_generator.py Python\\bytecodes.c\" exited with code 1. [E:\\cpython\\PCbuild\\pythoncore.vcxproj]\n\nBuild FAILED.\n\nE:\\cpython\\PCbuild\\regen.targets(97,5): error MSB3073: Command \"\"E:\\cpython\\PCbuild\\\\..\\externals\\pythonx86\\tools\\python.exe\"\n Tools\\cases_generator\\opcode_id_generator.py Python\\bytecodes.c\" exited with code 1. [E:\\cpython\\PCbuild\\pythoncore.vcxproj]\n    0 Warning(s)\n    1 Error(s)\n\nTime Elapsed 00:00:07.25\n```\n\n\u003c/details\u003e\n\u003cimg width=\"1484\" height=\"763\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/bcc09b47-b731-4bc5-a78c-3c2c32e7611a\" /\u003e\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nWindows\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-148611\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/Wulian233","@type":"Person","name":"Wulian233"},"datePublished":"2026-04-15T12:17:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/148609/cpython/issues/148609"}