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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Build from source on Windows - Cargo error without Rust toolchain","articleBody":"Follows on from https://github.com/nodejs/node/issues/63213\n\n### Version\n\nv27.0.0-pre 0e8fb913d857b0d4123995e401293a0c9ee5efd8\n\n### Platform\n\n```text\nMicrosoft Windows NT 10.0.26200.0 x64\n```\n\n### Subsystem\n\nbuild\n\n### What steps will reproduce the bug?\n\nOn Windows 11 25H2, follow prerequisite [Manual install](https://github.com/nodejs/node/blob/main/BUILDING.md#option-1-manual-install) instructions using:\n- Python 3.14.5\n- Visual Basic 2026 Build Tools 18.6.0 (May 2026)\n  - C++ Clang Compiler for Windows (Microsoft.VisualStudio.Component.VC.Llvm.Clang)\n  - MSBuild support for LLVM (clang-cl) toolset (Microsoft.VisualStudio.Component.VC.Llvm.ClangToolset)\n- NASM 3.01\n- Do not install a Rust toolchain (and otherwise ensure that there is no `rustc` or `cargo` installed).\n\nIn PowerShell 7 terminal, execute:\n\n```shell\ngit clone https://github.com/nodejs/node\ncd node\ngit switch main\ngit clean -xfd # if repeating\n.\\vcbuild.bat\nRelease\\node -e \"console.log('Hello from Node.js', process.version)\"\n```\n\n\n### How often does it reproduce? Is there a required condition?\n\nAlways if there is no Rust toolchain installed. Test with the following, which should both return errors:\n\n```shell\nrustc --version\ncargo --version\n```\n\n\n\n### What is the expected behavior? Why is that the expected behavior?\n\nIf a Rust toolchain is not installed, `vcbuild.bat` should warn (check for `rustc` \u0026 `cargo`) that Temporal support is disabled and continue to build without error.\n\nThis is implied by the documentation section [Building Node.js with Temporal support](https://github.com/nodejs/node/blob/main/BUILDING.md#building-nodejs-with-temporal-support) and the fact that on Linux, builds succeed if there is no Rust toolchain installed.\n\n\u003e If `--v8-enable-temporal-support` and `--v8-disable-temporal-support` are both omitted, `configure.py` probes for `cargo` and `rustc`. If either is missing, a warning is printed and Temporal support is disabled.\n\nIt should also be possible to disable temporal support actively when building under Windows.\n\n### What do you see instead?\n\nBuild emits error message and continues:\n\n\u003e C:\\Program Files (x86)\\Microsoft Visual Studio\\18\\BuildTools\\MSBuild\\Microsoft\\VC\\v180\\Microsoft.CppCommon.targets(254,5): error MSB8066: Custom build for 'Cargo.toml' exited with code 1\n\u003e . [C:\\Users\\mikem\\github\\NODEJS\\node\\deps\\crates\\node_crates.vcxproj]\n\nDirectory `Release` is not created. (`out\\Release` also contains no `node.exe`)\n\n### Additional information\n\nLogs\n\n```text\n.\\vcbuild.bat\nLooking for Python\nPython found in C:\\Users\\mikem\\AppData\\Local\\Microsoft\\WindowsApps\\\\python.exe\nPython 3.14.5\nLooking for NASM\nClangCL is required because the Node.js version being compiled is \u003e= 24.\nLooking for Visual Studio 2026\ncalling: \"C:\\Program Files (x86)\\Microsoft Visual Studio\\18\\BuildTools\\VC\\\\Auxiliary\\Build\\vcvarsall.bat\" amd64\n**********************************************************************\n** Visual Studio 2026 Developer Command Prompt v18.6.0\n** Copyright (c) 2026 Microsoft Corporation\n**********************************************************************\n[vcvarsall.bat] Environment initialized for: 'x64'\nFound MSVS version 18.0\nFound Clang version 20.1.8\nconfigure  --dest-cpu=x64 --clang-cl=20.1.8\n[WARNING] A shebang '/bin/sh' was found but does not match any supported template (e.g. '/usr/bin/python'), so it will be treated as an arbitrary command.\n[WARNING] To prevent execution of programs that are not Python runtimes, set 'shebang_can_run_anything' to 'false' in your configuration file.\nNode.js configure: Found Python 3.14.5...\nWarning: Missing input files:\nC:\\Users\\mikem\\github\\NODEJS\\node\\deps\\uv\\src\\win\\atomicops-inl.h\nC:\\Users\\mikem\\github\\NODEJS\\node\\deps\\inspector_protocol\\crdtp\\maybe.h\nC:\\Users\\mikem\\github\\NODEJS\\node\\tools\\v8_gypfiles\\..\\..\\deps\\v8\\third_party\\abseil-cpp\\absl\\base\\internal\\nullability_impl.h\nC:\\Users\\mikem\\github\\NODEJS\\node\\tools\\v8_gypfiles\\..\\..\\deps\\v8\\third_party\\abseil-cpp\\absl\\base\\internal\\fast_type_id.h\nC:\\Users\\mikem\\github\\NODEJS\\node\\tools\\v8_gypfiles\\..\\..\\deps\\v8\\third_party\\abseil-cpp\\absl\\base\\internal\\identity.h\nINFO: configure completed successfully\nProject files generated.\n\nsrc\\hdr_histogram.c(149,23): warning : incompatible pointer types passing 'uint32_t *' (aka 'unsigned int *') to parameter of type 'unsigned long *' [-Wincompatible-pointer-types] [C:\\Us\ners\\mikem\\github\\NODEJS\\node\\deps\\histogram\\histogram.vcxproj]\nC:\\Program Files (x86)\\Microsoft Visual Studio\\18\\BuildTools\\VC\\Tools\\Llvm\\x64\\lib\\clang\\20\\include\\intrin0.h(71,48): message : passing argument to parameter '_Index' here [C:\\Users\\mike\nm\\github\\NODEJS\\node\\deps\\histogram\\histogram.vcxproj]\n  In file included from src\\hdr_histogram.c:18:\nsrc\\hdr_atomic.h(23,13): warning : unused function 'hdr_atomic_store_pointer' [-Wunused-function] [C:\\Users\\mikem\\github\\NODEJS\\node\\deps\\histogram\\histogram.vcxproj]\n  histogram.vcxproj -\u003e ..\\..\\out\\Release\\lib\\histogram.lib\n  cargo_build\n  Traceback (most recent call last):\n    File \"C:\\Users\\mikem\\github\\NODEJS\\node\\deps\\crates\\cargo_build.py\", line 60, in \u003cmodule\u003e\n      main()\n      ~~~~^^\n    File \"C:\\Users\\mikem\\github\\NODEJS\\node\\deps\\crates\\cargo_build.py\", line 47, in main\n      ret = subprocess.call(cmd)\n    File \"C:\\Users\\mikem\\AppData\\Local\\Python\\pythoncore-3.14-64\\Lib\\subprocess.py\", line 396, in call\n      with Popen(*popenargs, **kwargs) as p:\n           ~~~~~^^^^^^^^^^^^^^^^^^^^^^\n    File \"C:\\Users\\mikem\\AppData\\Local\\Python\\pythoncore-3.14-64\\Lib\\subprocess.py\", line 1039, in __init__\n      self._execute_child(args, executable, preexec_fn, close_fds,\n      ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n                          pass_fds, cwd, env,\n                          ^^^^^^^^^^^^^^^^^^^\n      ...\u003c5 lines\u003e...\n                          gid, gids, uid, umask,\n                          ^^^^^^^^^^^^^^^^^^^^^^\n                          start_new_session, process_group)\n                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n    File \"C:\\Users\\mikem\\AppData\\Local\\Python\\pythoncore-3.14-64\\Lib\\subprocess.py\", line 1553, in _execute_child\n      hp, ht, pid, tid = _winapi.CreateProcess(executable, args,\n                         ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^\n                               # no special security\n                               ^^^^^^^^^^^^^^^^^^^^^\n      ...\u003c4 lines\u003e...\n                               cwd,\n                               ^^^^\n                               startupinfo)\n                               ^^^^^^^^^^^^\n  FileNotFoundError: [WinError 2] The system cannot find the file specified\nC:\\Program Files (x86)\\Microsoft Visual Studio\\18\\BuildTools\\MSBuild\\Microsoft\\VC\\v180\\Microsoft.CppCommon.targets(254,5): error MSB8066: Custom build for 'Cargo.toml' exited with code 1\n. [C:\\Users\\mikem\\github\\NODEJS\\node\\deps\\crates\\node_crates.vcxproj]\n```\n","author":{"url":"https://github.com/MikeMcC399","@type":"Person","name":"MikeMcC399"},"datePublished":"2026-05-20T09:19:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/63451/node/issues/63451"}