8000 IntelliSense does not recognize the __typeof__ operator · Issue #13556 · microsoft/vscode-cpptools · GitHub
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IntelliSense does not recognize the __typeof__ operator #13556

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oncipriani opened this issue Apr 26, 2025 · 1 comment
Open

IntelliSense does not recognize the __typeof__ operator #13556

oncipriani opened this issue Apr 26, 2025 · 1 comment
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bug Language Service parser Visual Studio Inherited from Visual Studio
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@oncipriani
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oncipriani commented Apr 26, 2025 •
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Environment

  • OS and Version: Windows 11 24H2
  • VS Code Version: 1.99.3
  • C/C++ Extension Version: 1.24.5

Bug Summary and Steps to Reproduce

Bug Summary:

The C/C++ extension's IntelliSense does not recognize the __typeof__ operator when using MSVC. According to Microsoft's documentation, it should be valid even when not using /std:clatest.

The following C code triggers the error:

int main(void) {
    int a = 0;
    __typeof__(a) b = 0; // This line triggers `expected a ';' - C/C++(65)`.

    return b; // This line triggers `identifier "b" is undefined - C/C++(20)`.
}

The code compiles and runs without any errors or warnings when compiling with /Wall /std:c17.

Expected behavior:

IntelliSense should be able to recognize the __typeof__ and __typeof_unqual__ operators, since they are supported by MSVC, clang and gcc.

Configuration and Logs

c_cpp_properties.json:

{
    "env": {
        "commonIncludePath": [
            "${workspaceFolder}/src/**",
            "${env:VULKAN_SDK}/include/**"
        ],
        "commonDefines": [
            "VK_NO_PROTOTYPES"
        ]
    },
    "configurations": [
        {
            "name": "Win32",
            "includePath": [
                "${commonIncludePath}"
            ],
            "defines": [
                "${commonDefines}",
                "STRICT",
                "WIN32_LEAN_AND_MEAN",
                "OPENWW_PLATFORM_WIN32",
                "VK_USE_PLATFORM_WIN32_KHR"
            ],
            "windowsSdkVersion": "10.0.26100.0",
            "compilerPath": "cl.exe",
            "cStandard": "c17",
            "cppStandard": "c++20",
            "intelliSenseMode": "windows-msvc-x64"
        }
    ],
    "version": 4
}



C/C++: Log Diagnostics:

-------- Diagnostics - 4/26/2025, 5:02:44 PM
Version: 1.24.5
Current Configuration:
{
    "name": "Win32",
    "includePath": [
        "e:/Sources/redesigned-octo-engine/src/**",
        "C:/VulkanSDK/1.4.309.0/include/**"
    ],
    "defines": [
        "VK_NO_PROTOTYPES",
        "STRICT",
        "WIN32_LEAN_AND_MEAN",
        "OPENWW_PLATFORM_WIN32",
        "VK_USE_PLATFORM_WIN32_KHR"
    ],
    "windowsSdkVersion": "10.0.26100.0",
    "compilerPath": "cl.exe",
    "cStandard": "c17",
    "cppStandard": "c++20",
    "intelliSenseMode": "windows-msvc-x64",
    "compilerPathIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "intelliSenseModeIsExplicit": true,
    "compilerPathInCppPropertiesJson": "cl.exe",
    "mergeConfigurations": false,
    "recursiveIncludes": {
        "reduce": "default",
        "priority": "afterSystemIncludes",
        "order": "depthFirst"
    },
    "browse": {
        "limitSymbolsToIncludedHeaders": true
    }
}
Modified Settings:
{
    "C_Cpp.intelliSenseUpdateDelay": 3000,
    "C_Cpp.loggingLevel": "Debug",
    "C_Cpp.autoAddFileAssociations": false
}
Additional Tracked Settings:
{
    "editorTabSize": 4,
    "editorInsertSpaces": true,
    "editorAutoClosingBrackets": "languageDefined",
    "filesEncoding": "utf8",
    "filesAssociations": {},
    "filesExclude": {
        "**/.git": true,
        "**/.svn": true,
        "**/.hg": true,
        "**/.DS_Store": true,
        "**/Thumbs.db": true
    },
    "filesAutoSaveAfterDelay": false,
    "editorInlayHintsEnabled": true,
    "editorParameterHintsEnabled": true,
    "searchExclude": {
        "**/node_modules": true,
        "**/bower_components": true,
        "**/*.code-search": true
    },
    "workbenchSettingsEditor": "ui"
}
cpptools version (native): 1.24.5.0
Current database path: C:\USERS\ONCIP\APPDATA\LOCAL\MICROSOFT\VSCODE-CPPTOOLS\68BE46447E1B42B5128F8789052FCC11\.BROWSE.VC.DB
Translation Unit Mappings:
[ E:\Sources\redesigned-octo-engine\src\containers\temp.c - source TU]:
Translation Unit Configurations:
[ E:\Sources\redesigned-octo-engine\src\containers\temp.c ]
    Process ID: 2932
    Memory Usage: 58 MB
    Compiler Path: C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Tools\MSVC\14.43.34808\bin\Hostx64\x64\cl.exe
    Include paths:
        include: C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Tools\MSVC\14.43.34808\include
        include: C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Auxiliary\VS\include
        include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\ucrt
        include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\um
        include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\shared
        include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\winrt
        include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\cppwinrt
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\um
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\ucrt
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\shared
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\winrt
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\cppwinrt
    Defines:
        VK_NO_PROTOTYPES
        STRICT
        WIN32_LEAN_AND_MEAN
        OPENWW_PLATFORM_WIN32
        VK_USE_PLATFORM_WIN32_KHR
    Standard Version: ms_c17
    IntelliSense Mode: windows-msvc-x64
    Other Flags:
        --using_directory
        C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Tools\MSVC\14.43.34808\lib\x64
        --using_directory
        C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Tools\MSVC\14.43.34808\lib\x86\store\references
        --using_directory
        C:\Program Files (x86)\Windows Kits\10\UnionMetadata\10.0.26100.0
        --using_directory
        C:\Program Files (x86)\Windows Kits\10\References\10.0.26100.0
        --using_directory
        C:\Windows\Microsoft.NET\Framework64\v4.0.30319
Total Memory Usage: 58 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 5253


Logs from the language server logging:

LSP: (received) cpptools/rescanFolder
LSP: (invoked) cpptools/rescanFolder
Intellisense update pending for: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c
Discovering files...
Shutting down IntelliSense server: E:\Sources\redesigned-octo-engine\src\containers\queue.c
Shutting down IntelliSense server: E:\Sources\redesigned-octo-engine\src\containers\temp.c
Shutting down IntelliSense server: E:\Sources\redesigned-octo-engine\src\containers\vector.c
  Processing folder (recursive): C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2022\BUILDTOOLS\VC\TOOLS\MSVC\14.43.34808\INCLUDE
  Processing folder (recursive): C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2022\BUILDTOOLS\VC\AUXILIARY\VS\INCLUDE
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\CPPWINRT
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\SHARED
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\UCRT
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\UM
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\WINRT
  Processing folder (recursive): C:\VULKANSDK\1.4.309.0\INCLUDE
  Processing folder (recursive): E:\SOURCES\REDESIGNED-OCTO-ENGINE
  Discovering files: 5253 file(s) processed
  0 file(s) removed from database
Done discovering files.
Parsing open files...
Parsing remaining files...
  Parsing: 0 files(s) processed
Done parsing remaining files.
Done parsing open files.
IntelliSense update scheduled and TU acquisition started for: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c
Expanding recursive includes for: E:\SOURCES\REDESIGNED-OCTO-ENGINE\SRC\CONTAINERS\TEMP.C
Done expanding recursive includes for: E:\SOURCES\REDESIGNED-OCTO-ENGINE\SRC\CONTAINERS\TEMP.C
Reducing recursive includes for: E:\SOURCES\REDESIGNED-OCTO-ENGINE\SRC\CONTAINERS\TEMP.C
Done reducing recursive includes for: E:\SOURCES\REDESIGNED-OCTO-ENGINE\SRC\CONTAINERS\TEMP.C
sending compilation args for E:\Sources\redesigned-octo-engine\src\containers\temp.c
  include: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2022\BUILDTOOLS\VC\TOOLS\MSVC\14.43.34808\INCLUDE
  include: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2022\BUILDTOOLS\VC\AUXILIARY\VS\INCLUDE
  include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\UCRT
  include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\UM
  include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\SHARED
  include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\WINRT
  include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\CPPWINRT
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\UM
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\UCRT
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\SHARED
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\WINRT
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.26100.0\CPPWINRT
  define: VK_NO_PROTOTYPES
  define: STRICT
  define: WIN32_LEAN_AND_MEAN
  define: OPENWW_PLATFORM_WIN32
  define: VK_USE_PLATFORM_WIN32_KHR
  other: --using_directory
  other: C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Tools\MSVC\14.43.34808\lib\x64
  other: --using_directory
  other: C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Tools\MSVC\14.43.34808\lib\x86\store\references
  other: --using_directory
  other: C:\Program Files (x86)\Windows Kits\10\UnionMetadata\10.0.26100.0
  other: --using_directory
  other: C:\Program Files (x86)\Windows Kits\10\References\10.0.26100.0
  other: --using_directory
  other: C:\Windows\Microsoft.NET\Framework64\v4.0.30319
  stdver: ms_c17
  intelliSenseMode: windows-msvc-x64
Update IntelliSense time (sec): 0.047
LSP: (received) cpptools/getFoldingRanges: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c (id: 396)
LSP: (invoked) cpptools/getFoldingRanges: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c (id: 396)
LSP: Sending response (id: 396)
LSP: (received) cpptools/getFoldingRanges: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c (id: 397)
LSP: (invoked) cpptools/getFoldingRanges: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c (id: 397)
LSP: Sending response (id: 397)
LSP: (received) cpptools/didChangeActiveEditor: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c
LSP: (invoked) cpptools/didChangeActiveEditor: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c
LSP: (received) cpptools/getDiagnostics (id: 398)
LSP: (invoked) cpptools/getDiagnostics (id: 398)
LSP: Sending response (id: 398)
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/didChangeActiveEditor: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c
LSP: (invoked) cpptools/didChangeActiveEditor: file:///e%3A/Sources/redesigned-octo-engine/src/containers/temp.c
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors

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@bobbrow
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bobbrow commented Apr 28, 2025

@oncipriani thank you for reporting this. Interestingly enough, this was also j 8F8C ust reported in Visual Studio. When it is fixed there, we will also get the fix in the C/C++ extension.

@bobbrow bobbrow added this to the Tracking milestone Apr 28, 2025
@bobbrow bobbrow added the Visual Studio Inherited from Visual Studio label Apr 28, 2025
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