Extension Misidentifying C++ headers as C or CUDA C++

[dnwillia-work]

Environment

• OS and Version: Mac OS Sequoia and Windows 11.
• VS Code Version: 1.103.1
• C/C++ Extension Version: 1.25.3 or later.
• If using SSH remote, specify OS of remote machine: N/A

Bug Summary and Steps to Reproduce

Bug Summary:

Between versions 1.24.5 and 1.25.3 the parser seems to have started misidentifying C++ header files with .hpp extensions as C or CUDA C++. It still happens with the latest release version.

What the headers are identified as is sensitive to whether not the header files are included into SWIG input files or contain inclusion CUDA specific macros.

Even if I force the header files to be identified as C++ in the json settings or explicitly selecting it by clicking the bottom right language icon the parser always switches back to C or CUDA C++.

Steps to reproduce:

1. Install 1.25.3 or later
2. Make sure you have .i swig input or CUDA source files the headers are included into
3. They are misidentified.

I could try out a smaller project with a few files and see if it is not working if needed. It's been tough to reproduce this one as I was not sure if I made a change in my repo that caused it, but it seems to be the newest version of the extension.

Expected behavior:
My header files are properly identified as C++ as they are at 1.24.5.

Configuration and Logs

Configuration

{
    "configurations": [
        {
            "name": "Win32",
            "includePath": [
                "${workspaceFolder}/Source/**",
                "${workspaceFolder}/tools/**"
            ],
            "defines": [
                "NDEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "windowsSdkVersion": "10.0.19041.0",
            "compilerPath": "cl.exe",
            "cStandard": "c17",
            "cppStandard": "c++17",
            "intelliSenseMode": "windows-msvc-x64",
            "compileCommands": [
                "${workspaceFolder}/compile_commands.json"
            ]
        },
        {
            "name": "Mac",
            "includePath": [
                "${workspaceFolder}/Source/**",
                "${workspaceFolder}/tools/**"
            ],
            "defines": [
                "NDEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "macFrameworkPath": [
                "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks"
            ],
            "compilerPath": "/usr/bin/g++",
            "cStandard": "c17",
            "cppStandard": "c++17",
            "intelliSenseMode": "macos-clang-arm64",
            "compileCommands": [
                "${workspaceFolder}/compile_commands.json"
            ]
        },
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/Source/**",
                "${workspaceFolder}/tools/**"
            ],
            "defines": [
                "NDEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "compilerPath": "/usr/bin/g++",
            "cStandard": "c17",
            "cppStandard": "c++17",
            "intelliSenseMode": "linux-gcc-x64",
            "compileCommands": [
                "${workspaceFolder}/compile_commands.json"
            ]
        }
    ],
    "version": 4
}

Diagnostics:

-------- Diagnostics - 8/19/2025, 5:22:58 PM
Version: 1.26.3
Current Configuration:
{
    "name": "Win32",
    "includePath": [
        "d:/ANSYSDev/FluidProps/dev/Source/**",
        "d:/ANSYSDev/FluidProps/dev/tools/**"
    ],
    "defines": [
        "NDEBUG",
        "UNICODE",
        "_UNICODE"
    ],
    "windowsSdkVersion": "10.0.19041.0",
    "compilerPath": "cl.exe",
    "cStandard": "c17",
    "cppStandard": "c++17",
    "intelliSenseMode": "windows-msvc-x64",
    "compileCommands": [
        "d:\\ANSYSDev\\FluidProps\\dev/compile_commands.json"
    ],
    "compilerPathIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "intelliSenseModeIsExplicit": true,
    "recursiveIncludesReduceIsExplicit": false,
    "recursiveIncludesPriorityIsExplicit": false,
    "recursiveIncludesOrderIsExplicit": false,
    "compilerPathInCppPropertiesJson": "cl.exe",
    "compileCommandsInCppPropertiesJson": [
        "${workspaceFolder}/compile_commands.json"
    ],
    "mergeConfigurations": false,
    "recursiveIncludes": {},
    "browse": {
        "limitSymbolsToIncludedHeaders": true
    }
}
Modified Settings:
{
    "C_Cpp.files.exclude": {
        "**/.vscode": true,
        "**/.vs": true,
        "pkgDir/**": true,
        "Builds/**": true,
        "tools/**": true,
        "**/*.i": true
    },
    "C_Cpp.codeAnalysis.exclude": {
        "tools/**": true,
        "Builds/**": true,
        "pkgDir/**": true,
        "**/*.i": true,
        "venv*": true
    },
    "C_Cpp.autoAddFileAssociations": false
}
Additional Tracked Settings:
{
    "editorTabSize": 2,
    "editorInsertSpaces": true,
    "editorAutoClosingBrackets": "languageDefined",
    "filesEncoding": "utf8",
    "filesAssociations": {
        "*.hpp": "cpp",
        "*.f90": "FortranFreeForm",
        "*.h": "c",
        ".clang-tidy": "yaml",
        ".clang-format": "yaml",
        "*.i": "swiglang",
        "SConstruct": "python",
        "SConscript": "python"
    },
    "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): 1.26.3.0
Current database path: C:\USERS\DNWILLIA\APPDATA\LOCAL\MICROSOFT\VSCODE-CPPTOOLS\60EA050BA2F42AF6454DD0C303D5F5AF\.BROWSE.VC.DB
Translation Unit Mappings:
[ D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPLib.i - source TU]:
    D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPFluid.hpp
Translation Unit Configurations:
[ D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPLib.i ]
    Process ID: 135012
    Memory Usage: 75 MB
    Compiler Path: C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.20.27508\bin\Hostx64\x64\cl.exe
    Include paths:
        system include: C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.20.27508\include
        system include: C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.20.27508\atlmfc\include
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\um
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\ucrt
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\shared
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\winrt
        system include: C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\cppwinrt
        include (recursive): D:\ANSYSDev\FluidProps\dev\Source
    Defines:
        NDEBUG
        UNICODE
        _UNICODE
    Standard Version: ms_c17
    IntelliSense Mode: windows-msvc-x64
Total Memory Usage: 75 MB
Browse Paths from compile_commands.json, from workspace folder: D:\ANSYSDev\FluidProps\dev
    C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.20.27508\atlmfc\include
    C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.20.27508\include
    C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\cppwinrt
    C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\shared
    C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\ucrt
    C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\um
    C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\winrt
    D:\ANSYSDev\FluidProps\dev
    D:\ANSYSDev\FluidProps\dev\Conan\daf340\1\CPython\3_10\winx64\Release\python\include
    D:\ANSYSDev\FluidProps\dev\Source
    D:\ANSYSDev\FluidProps\dev\Source\EosLib
    D:\ANSYSDev\FluidProps\dev\Source\EosLib\cxxtest
    D:\ANSYSDev\FluidProps\dev\Source\EosLib\src
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\AType\Complex
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\AType\Complex\cxxtest
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\AType\Complex\src
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\AType\Real
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\AType\Real\cxxtest
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\AType\Real\src
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\AType\Tangent
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\AType\Tangent\cxxtest
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\AType\Tangent\src
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\Containers
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\Containers\cxxtest
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\Containers\src
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\Tabulation
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\Tabulation\cxxtest
    D:\ANSYSDev\FluidProps\dev\Source\Kernel\Tabulation\src
    D:\ANSYSDev\FluidProps\dev\Source\RefProp
    D:\ANSYSDev\FluidProps\dev\Source\RefProp\cxxtest
    D:\ANSYSDev\FluidProps\dev\Source\RefProp\src
    D:\ANSYSDev\FluidProps\dev\Source\RefProp\src\tests
    D:\ANSYSDev\FluidProps\dev\Source\RGPLib
    D:\ANSYSDev\FluidProps\dev\Source\RGPLib\cxxtest
    D:\ANSYSDev\FluidProps\dev\Source\RGPLib\src
    D:\ANSYSDev\FluidProps\dev\tools

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 55510
Number of files parsed: 1888

Logs

loggingLevel: 6
LSP: (received - deferred) textDocument/didOpen: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (received) cpptools/initialize (id: 1)
LSP: (invoked) cpptools/initialize (id: 1)
cpptools version (TypeScript): 1.26.3
cpptools version (native): 1.26.3.0
Autocomplete is enabled.
Error squiggles are enabled if all header dependencies are resolved.
Hover is enabled.
IntelliSense Engine = default.
LSP: Sending response (id: 1)
LSP: (received) cpptools/queryCompilerDefaults (id: 2)
LSP: (invoked) cpptools/queryCompilerDefaults (id: 2)
Compiler info database not connected - skipping load.
Compiler info database not connected - skipping load.
LSP: Sending response (id: 2)
LSP: (received) cpptools/didChangeCppProperties (id: 3)
LSP: (invoked) cpptools/didChangeCppProperties (id: 3)
LSP: (received) cpptools/didChangeSettings
LSP: (received) cpptools/didChangeSettings
LSP: (received - deferred) cpptools/didChangeVisibleTextEditors
LSP: (received - deferred) cpptools/didChangeActiveEditor: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (received - deferred) cpptools/didChangeTextEditorSelection
Code browsing service initialized
Populating file name cache...
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
Attempting to get defaults from C++ compiler in "compilerPath" property: 'cl.exe'
  Unable to index files from non-existent folder: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\KERNEL\ATYPE\COMPLEX\SRC
  Unable to index files from non-existent folder: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\KERNEL\ATYPE\REAL\SRC
  Unable to index files from non-existent folder: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\KERNEL\ATYPE\TANGENT\SRC
  Folder: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\ATLMFC\INCLUDE will be indexed
  Folder: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\INCLUDE will be indexed
  Folder: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\CPPWINRT will be indexed
  Folder: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\SHARED will be indexed
  Folder: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UCRT will be indexed
  Folder: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UM will be indexed
  Folder: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\WINRT will be indexed
  Folder: D:\ANSYSDEV\FLUIDPROPS\DEV will be indexed
LSP: (queued) textDocument/didOpen: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (queued) cpptools/didChangeVisibleTextEditors
LSP: (queued) cpptools/didChangeActiveEditor: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (queued) cpptools/didChangeTextEditorSelection
LSP: Sending response (id: 3)
LSP: (invoked) cpptools/didChangeSettings
Discovering files...
Autocomplete is enabled.
Error squiggles are enabled if all header dependencies are resolved.
Hover is enabled.
IntelliSense Engine = default.
Enhanced Colorization is enabled.
LSP: (invoked) cpptools/didChangeSettings
Autocomplete is enabled.
Error squiggles are enabled if all header dependencies are resolved.
Hover is enabled.
IntelliSense Engine = default.
Enhanced Colorization is enabled.
LSP: (invoked) textDocument/didOpen: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (invoked) cpptools/didChangeVisibleTextEditors
Intellisense update pending for: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (invoked) cpptools/didChangeActiveEditor: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (invoked) cpptools/didChangeTextEditorSelection
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
  Processing folder (non-recursive): C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\INCLUDE
  Processing folder (non-recursive): C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\ATLMFC\INCLUDE
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\CPPWINRT
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\SHARED
LSP: (received) cpptools/getDocumentSymbols: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 4)
LSP: (invoked) cpptools/getDocumentSymbols: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 4)
LSP: Sending response (id: 4)
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UCRT
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UM
  Processing folder (recursive): C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\WINRT
  Processing folder (recursive): D:\ANSYSDEV\FLUIDPROPS\DEV
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 5)
LSP: (received) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 6)
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 7)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 5)
LSP: $/cancelRequest (cpptools/getCodeActions, id: 5)
LSP: (invoked) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 6)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 7)
LSP: Sending response (id: 7)
LSP: Sending response (id: 6)
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 8)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 8)
LSP: Sending response (id: 8)
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 9)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 9)
LSP: Sending response (id: 9)
IntelliSense update scheduled and TU acquisition started for: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (received) cpptools/didChangeCompileCommands: file:///d%3A/ANSYSDev/FluidProps/dev/compile_commands.json
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 10)
  Discovering files: 55510 file(s) processed
  0 file(s) removed from database
Done discovering files.
Parsing remaining files...
  Parsing: 0 files(s) processed
Done parsing remaining files.
Done populating filename cache. Elapsed time: 2752 ms
LSP: (invoked) cpptools/didChangeCompileCommands: file:///d%3A/ANSYSDev/FluidProps/dev/compile_commands.json
Expanding recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
Done expanding recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
Reducing recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
Done reducing recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 11)
sending compilation args for D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPLib.i
  system include: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\INCLUDE
  system include: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\ATLMFC\INCLUDE
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UM
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UCRT
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\SHARED
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\WINRT
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\CPPWINRT
  define: NDEBUG
  define: UNICODE
  define: _UNICODE
  stdver: ms_c17
  intelliSenseMode: windows-msvc-x64
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 10)
LSP: (invoked) cpptools/didChangeVisibleTextEditors
Shutting down IntelliSense server: D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPLib.i
LSP: (invoked) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 11)
Expanding recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
Done expanding recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
Reducing recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
Done reducing recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
LSP: Sending response (id: 10)
LSP: Sending response (id: 11)
sending compilation args for D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPLib.i
  system include: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\INCLUDE
  system include: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\ATLMFC\INCLUDE
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UM
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UCRT
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\SHARED
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\WINRT
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\CPPWINRT
  define: NDEBUG
  define: UNICODE
  define: _UNICODE
  stdver: ms_c17
  intelliSenseMode: windows-msvc-x64
Error squiggles will be disabled in: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
Update IntelliSense time (sec): 1.447
LSP: (received) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 12)
LSP: (invoked) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 12)
LSP: Sending response (id: 12)
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 13)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 13)
LSP: Sending response (id: 13)
LSP: (received) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 14)
LSP: (invoked) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 14)
LSP: Sending response (id: 14)
LSP: (received) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 15)
LSP: (invoked) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 15)
LSP: Sending response (id: 15)
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 16)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 16)
LSP: Sending response (id: 16)
LSP: $/cancelRequest (<unknown/completed>, id: 16)
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 17)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 17)
LSP: Sending response (id: 17)
LSP: $/cancelRequest (<unknown/completed>, id: 17)
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 18)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 18)
LSP: Sending response (id: 18)
LSP: (received) cpptools/didChangeTextEditorSelection
LSP: (invoked) cpptools/didChangeTextEditorSelection
LSP: (received) cpptools/didChangeTextEditorSelection
LSP: (invoked) cpptools/didChangeTextEditorSelection
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 19)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 19)
1 include path suggestion(s) discovered.
LSP: Sending response (id: 19)
LSP: (received) textDocument/definition: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 20)
LSP: (invoked) textDocument/definition: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 20)
LSP: Sending response (id: 20)
LSP: (received) textDocument/didClose: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (invoked) textDocument/didClose: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (received) textDocument/didOpen: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (invoked) textDocument/didOpen: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 21)
LSP: (invoked) cpptools/didChangeVisibleTextEditors
Shutting down IntelliSense server: D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPLib.i
Intellisense update pending for: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 21)
1 include path suggestion(s) discovered.
LSP: Sending response (id: 21)
LSP: (received) textDocument/definition: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 22)
LSP: (invoked) textDocument/definition: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 22)
LSP: Sending response (id: 22)
LSP: (received) textDocument/didOpen: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPInterpolate.hpp
LSP: (invoked) textDocument/didOpen: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPInterpolate.hpp
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (received) textDocument/didClose: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPInterpolate.hpp
LSP: (invoked) cpptools/didChangeVisibleTextEditors
LSP: (invoked) textDocument/didClose: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPInterpolate.hpp
IntelliSense update scheduled and TU acquisition started for: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
Expanding recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
Done expanding recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
Reducing recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
Done reducing recursive includes for: D:\ANSYSDEV\FLUIDPROPS\DEV\SOURCE\RGPLIB\RGPLIB.I
sending compilation args for D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPLib.i
  system include: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\INCLUDE
  system include: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\PROFESSIONAL\VC\TOOLS\MSVC\14.20.27508\ATLMFC\INCLUDE
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UM
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\UCRT
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\SHARED
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\WINRT
  system include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.19041.0\CPPWINRT
  define: NDEBUG
  define: UNICODE
  define: _UNICODE
  stdver: ms_c17
  intelliSenseMode: windows-msvc-x64
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 23)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 23)
LSP: (received) cpptools/hover: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 24)
LSP: (invoked) cpptools/hover: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 24)
1 include path suggestion(s) discovered.
LSP: Sending response (id: 23)
LSP: Sending response (id: 24)
Error squiggles will be disabled in: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp
Update IntelliSense time (sec): 0.29
LSP: (received) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 25)
LSP: (invoked) cpptools/getCodeActions: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 25)
1 include path suggestion(s) discovered.
LSP: Sending response (id: 25)
LSP: (received) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 26)
LSP: (invoked) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 26)
LSP: Sending response (id: 26)
LSP: (received) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 27)
LSP: (invoked) cpptools/getFoldingRanges: file:///d%3A/ANSYSDev/FluidProps/dev/Source/RGPLib/RGPFluid.hpp (id: 27)
LSP: Sending response (id: 27)
LSP: (received) cpptools/didChangeTextEditorSelection
LSP: (invoked) cpptools/didChangeTextEditorSelection
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors

Other Extensions

I've not tried disabling other extensions but reverting the C++ extension version does work.

Additional context

@sranjan19 has also reproduced this issue, so it's not just me.

[sranjan19]

Apart from what @dnwillia-work mentioned, in my observation, the files getting identified as CUDA C++ include other files which have CUDA specific codes.

[Colengms]

Hi @dnwillia-work . When encountering a header file, the C/C++ Extension will attempt to map it to a source file, and uses that source file to start up an IntelliSense translation unit. What you are seeing sounds like C or CUDA source files being selected from the include graph, to host the header.

In your diagnostics output, I see:

[ D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPLib.i - source TU]:
    D:\ANSYSDev\FluidProps\dev\Source\RGPLib\RGPFluid.hpp

... indicating that the RGPFluid.hpp header has been associated with RGPLib.i. It's RGPLib.i that is being considered a C file. The ".i" extension is associated with C, by default. If your ".i" files should always be associated with C++ instead, consider associating "*.i" with C++, using a files.associations setting.

Does the above explain the other occurrences of incorrect languages being selected for your header files?

[Colengms]

Generally/historically, .i files are associated with preprocessed C output, while .ii files are associated with C++ preprocessed output. i.e.

gcc -E file.c -o file.i

g++ -E file.cpp -o file.ii

[dnwillia-work]

Does the above explain the other occurrences of incorrect languages being selected for your header files?

OK I did not know that about .i files. For sure SWIG input files are normally suffixed the same way and I am pretty sure I changed them to .swg instead and it still ends up doing the same thing. I could try it again. I think I also had those files associated with swiglang, still did not help.

It also does not explain the misidentification as CUDA C++ files, which perhaps happens for the reason @sranjan19 is saying.

I can say for certain the behavior changed from 1.24.5 to 1.25.3. I just tried it on my mac again and it's reproducible.

[dnwillia-work]

So, yes, it does seem to be sensitive to how the .i files are identified. I'm seeing that if the .i files are identified as SWIG files (after installing the SWIG language extension) or forcing them to be cpp in files.associations then it's ok even with the latest version of the extension. I'll do a bit more testing on this tomorrow.

EDIT: The only thing that seems to make the current extension work is forcing the SWIG input files to be C++ in files.associations. Even if I rename the input files to .swg instead and set them to swiglang in files.associations with the SWIG extension installed, its still misidentifying the headers.

So, for now I'm stuck on extension version 1.24.5.

[Colengms]

Hi @dnwillia-work . I'm not sure what else we can do here. The C/C++ Extension depends on files being associated with it, and with the language they should be interpreted as. Perhaps you can follow up with the authors of the SWIG language extension and see if they have a particular way they intended to be able to wrapper C/C++ files with their own language service while still having those files somehow handled by a separate C/C++ language service. Perhaps your header files should also be associated with SWIG instead?

[dnwillia-work]

@Colengms

It's not just an issue with including the headers into SWIG input. As @sranjan19 pointed out, it also happens when including CUDA headers into C++ headers. I can delete all the swig files from my repo entirely and those headers still get misidentified.

There's also the fact that the behavior certainly changed in the release transition of 1.24.5 -> 1.25.3. Is there no obvious change that went into the repo in that time frame that might have caused this?

[Colengms]

Hi @dnwillia-work . The process for selecting a language for a header file is, as I mentioned:

the C/C++ Extension will attempt to map it to a source file, and uses that source file to start up an IntelliSense translation unit.

That involves walking a dependency graph until it finds a top-most source file. Provided you're including headers from files that are correctly mapped to a language, and the headers are appropriate for that language, it's unclear to me what issue you might be seeing.

Can you provide logs from a specific repro in which an inappropriate language appeared to be selected for a file? Using that information, I suspect we should be able to track down what source file was selected and why. Without that information, I don't yet have any evidence of an issue. Note that there is some variability as to what source file will be selected for a header file. Source files (that directly or indirectly include that header) that are currently open are preferred. Source files that have custom configurations or compile_command.json entries are preferred over source files that do not have them. If the browse database is still being populated, the include graph may be incomplete, and a different source chosen (or no source file at all, resulting in the header being interpreted as the default language for that header).

when including CUDA headers into C++ headers

If a CUDA header is included into a C++ header file, and that is included by a CUDA source file, that should result in the header being handled as CUDA. If that C++ header file is included in a C++ source file, it would seem equally appropriate for the header to be handled as C++.