C++ extension is only partially activating

[bhubavenski]

Environment

• OS and Version: Windows 11 Pro 24H2
• VS Code Version: 1.102.0
• C/C++ Extension Version: 1.26.3
• If using SSH remote, specify OS of remote machine: N/A

Bug Summary and Steps to Reproduce

Bug Summary:
C/C++ extension no longer shows some semantic errors, error markers stay after fixing, and in some cases the extension fails to activate entirely.

Steps to reproduce:

1. Open a .cpp file in your working directory.

2. Add a semantic error (e.g. declare the same variable twice).

3. Observe that no error marker appears until you compile.

4. Fix the error — notice the red squiggle doesn't disappear.

5. Reinstall the C++ extension and reopen the same file.

Notice that the extension may fail to activate completely — C/C++ commands don’t show in the Command Palette.

Expected behavior:

1. Semantic errors should be detected and marked automatically, without the need to compile.

2. Error markers should disappear immediately when the code is corrected.

3. The C/C++ extension should activate properly and recognize .cpp files, including showing its commands in the Command Palette.

Additional context:

These issues started on the Tuesday before this report.

Initially, only semantic errors were missing or not updating correctly.

On the next day, the situation worsened: the extension didn't activate, didn’t recognize .cpp files, and provided no C/C++ commands in the Command Palette.

I tested with an alternative language server (Clang via a separate extension), and it worked as expected — errors were detected, the extension responded properly, and all language features worked.

Reinstalling the Microsoft C/C++ extension didn’t help.

Let me know if I can provide logs or additional diagnostics — happy to help.

Configuration and Logs

{
    "configurations": [
        {
            "name": "GCC",
            "includePath": [
                "${workspaceFolder}/**"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "cStandard": "c17",
            "cppStandard": "gnu++17",
            "intelliSenseMode": "windows-gcc-x64",
            "compilerPath": "C:/msys64/ucrt64/bin/g++.exe"
        }
    ],
    "version": 4
}



{
  "os": "win32",
  "vscodeVersion": "1.102.0",
  "cmtVersion": "1.21.36",
  "configurations": [
    {
      "folder": "c:\\Users\\bobkata75\\Desktop\\new-cpp",
      "cmakeVersion": "4.1.0",
      "configured": true,
      "generator": "MinGW Makefiles",
      "usesPresets": false,
      "compilers": {
        "C": "C:/msys64/ucrt64/bin/gcc.exe",
        "CXX": "C:/msys64/ucrt64/bin/g++.exe"
      }
    }
  ],
  "cpptoolsIntegration": {
    "isReady": false,
    "hasCodeModel": false,
    "activeBuildType": "",
    "buildTypesSeen": [],
    "requests": [],
    "responses": [],
    "partialMatches": [],
    "targetCount": 0,
    "executablesCount": 0,
    "librariesCount": 0,
    "targets": []
  },
  "settings": [
    {
      "communicationMode": "automatic",
      "useCMakePresets": "auto",
      "configureOnOpen": true
    }
  ]
}



loggingLevel: 6
LSP: (received - deferred) textDocument/didOpen: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp
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.
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/queryCompilerDefaults (id: 3)
LSP: (invoked) cpptools/queryCompilerDefaults (id: 3)
Compiler info database not connected - skipping load.
LSP: (received) cpptools/didChangeCppProperties (id: 4)
Compiler info database not connected - skipping load.
LSP: (received) cpptools/didChangeSettings
LSP: Sending response (id: 3)
LSP: (invoked) cpptools/didChangeCppProperties (id: 4)
LSP: (received - deferred) cpptools/didChangeTextEditorSelection
LSP: (received - deferred) cpptools/didChangeTextEditorSelection
LSP: (received - deferred) cpptools/didChangeVisibleTextEditors
Code browsing service initialized
LSP: (received - deferred) cpptools/getDocumentSymbols: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 5)
Populating file name cache...
Querying compiler for default C++ language standard using command line: C:/msys64/ucrt64/bin/g++.exe -x c++ -E -dM nul
LSP: (received - deferred) cpptools/getFoldingRanges: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 6)
Detected language standard version: gnu++17
Querying compiler's default target using command line: "C:/msys64/ucrt64/bin/g++.exe" -dumpmachine
Compiler returned default target value: x86_64-w64-mingw32
Compiler query command line: C:/msys64/ucrt64/bin/g++.exe -std=gnu++17 -m64 -Wp,-v -E -dM -x c++ nul
Compiler query command line: C:/msys64/ucrt64/bin/g++.exe -std=c17 -m64 -Wp,-v -E -dM -x c nul
Attempting to get defaults from C++ compiler in "compilerPath" property: 'C:/msys64/ucrt64/bin/g++.exe'
Done populating filename cache. Elapsed time: 305 ms
Attempting to get defaults from C compiler in "compilerPath" property: 'C:/msys64/ucrt64/bin/g++.exe'
  Folder: C:\MSYS64\UCRT64\INCLUDE will be indexed
  Folder: C:\MSYS64\UCRT64\LIB\GCC\X86_64-W64-MINGW32\15.1.0\INCLUDE will be indexed
  Folder: C:\MSYS64\UCRT64\LIB\GCC\X86_64-W64-MINGW32\15.1.0\INCLUDE-FIXED will be indexed
  Folder: C:\USERS\BOBKATA75\DESKTOP\NEW-CPP will be indexed
LSP: (queued) textDocument/didOpen: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp
LSP: (queued) cpptools/didChangeTextEditorSelection
LSP: (queued) cpptools/didChangeTextEditorSelection
LSP: (queued) cpptools/didChangeVisibleTextEditors
LSP: (queued) cpptools/getDocumentSymbols: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 5)
LSP: (queued) cpptools/getFoldingRanges: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 6)
LSP: Sending response (id: 4)
LSP: (invoked) cpptools/getDocumentSymbols: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 5)
LSP: (invoked) cpptools/didChangeSettings
Discovering files...
Autocomplete is enabled.
Error squiggles are enabled.
Hover is enabled.
IntelliSense Engine = default.
Enhanced Colorization is enabled.
LSP: (invoked) textDocument/didOpen: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp
Saved (gcc) compiler definition to database: C:/msys64/ucrt64/bin/g++.exe
  Processing folder (recursive): C:\MSYS64\UCRT64\INCLUDE
Saved (gcc) compiler definition to database: C:/msys64/ucrt64/bin/g++.exe
  Processing folder (recursive): C:\MSYS64\UCRT64\LIB\GCC\X86_64-W64-MINGW32\15.1.0\INCLUDE
tag parsing file: C:\Users\bobkata75\Desktop\new-cpp\src\main.cpp
LSP: (invoked) cpptools/didChangeTextEditorSelection
LSP: (invoked) cpptools/didChangeVisibleTextEditors
Intellisense update pending for: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp
LSP: (invoked) cpptools/getFoldingRanges: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 6)
  Processing folder (recursive): C:\MSYS64\UCRT64\LIB\GCC\X86_64-W64-MINGW32\15.1.0\INCLUDE-FIXED
IntelliSense update scheduled and TU acquisition started for: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp
  Processing folder (recursive): C:\USERS\BOBKATA75\DESKTOP\NEW-CPP
LSP: Sending response (id: 6)
LSP: Sending response (id: 5)
Expanding recursive includes for: C:\USERS\BOBKATA75\DESKTOP\NEW-CPP\SRC\MAIN.CPP
Done expanding recursive includes for: C:\USERS\BOBKATA75\DESKTOP\NEW-CPP\SRC\MAIN.CPP
Reducing recursive includes for: C:\USERS\BOBKATA75\DESKTOP\NEW-CPP\SRC\MAIN.CPP
  Discovering files: 5025 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 reducing recursive includes for: C:\USERS\BOBKATA75\DESKTOP\NEW-CPP\SRC\MAIN.CPP
sending compilation args for C:\Users\bobkata75\Desktop\new-cpp\src\main.cpp
  system include: C:\MSYS64\UCRT64\INCLUDE\C++\15.1.0
  system include: C:\MSYS64\UCRT64\INCLUDE\C++\15.1.0\X86_64-W64-MINGW32
  system include: C:\MSYS64\UCRT64\INCLUDE\C++\15.1.0\BACKWARD
  system include: C:\MSYS64\UCRT64\LIB\GCC\X86_64-W64-MINGW32\15.1.0\INCLUDE
  system include: C:\MSYS64\UCRT64\INCLUDE
  system include: C:\MSYS64\UCRT64\LIB\GCC\X86_64-W64-MINGW32\15.1.0\INCLUDE-FIXED
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  define: __FLT16_NORM_MAX__=6.55040000000000000000000000000000000e+4F16
  define: __DEC64_MANT_DIG__=16
  define: __FLT32_DENORM_MIN__=1.40129846432481707092372958328991613e-45F32
  define: __SIG_ATOMIC_WIDTH__=32
  define: __INT_LEAST64_TYPE__=long long int
  define: __INT16_TYPE__=short int
  define: __INT_LEAST8_TYPE__=signed char
  define: __FLT16_MAX__=6.55040000000000000000000000000000000e+4F16
  define: __nocona__=1
  define: __FLT128_MIN__=3.36210314311209350626267781732175260e-4932F128
  define: __SIZEOF_INT__=4
  define: __DEC32_MAX_EXP__=97
  define: __INT_FAST8_MAX__=0x7f
  define: __FLT128_MAX__=1.18973149535723176508575932662800702e+4932F128
  define: __INTPTR_MAX__=0x7fffffffffffffffLL
  define: __WIN64__=1
  define: __FLT64_HAS_QUIET_NAN__=1
  define: __stdcall=__attribute__((__stdcall__))
  define: __FLT32_MIN_10_EXP__=(-37)
  define: __EXCEPTIONS=1
  define: __GXX_MERGED_TYPEINFO_NAMES=0
  define: __UINT16_C(c)=c
  define: __PTRDIFF_WIDTH__=64
  define: __INT_FAST16_WIDTH__=16
  define: __FLT64_HAS_INFINITY__=1
  define: __FLT64X_MAX__=1.18973149535723176502126385303097021e+4932F64x
  define: __FLT16_HAS_INFINITY__=1
  define: __STDCPP_DEFAULT_NEW_ALIGNMENT__=16
  define: __SIG_ATOMIC_MIN__=(-__SIG_ATOMIC_MAX__ - 1)
  define: __GCC_ATOMIC_LONG_LOCK_FREE=2
  define: __DEC32_MANT_DIG__=7
  define: __INTPTR_TYPE__=long long int
  define: __UINT16_TYPE__=short unsigned int
  define: __WCHAR_TYPE__=short unsigned int
  define: __pic__=1
  define: __UINTPTR_MAX__=0xffffffffffffffffULL
  define: __INT_FAST64_WIDTH__=64
  define: __INT_FAST64_MAX__=0x7fffffffffffffffLL
  define: __GCC_ATOMIC_TEST_AND_SET_TRUEVAL=1
  define: __FLT_NORM_MAX__=3.40282346638528859811704183484516925e+38F
  define: __FLT32_HAS_INFINITY__=1
  define: __FLT64X_MAX_EXP__=16384
  define: __UINT_FAST64_TYPE__=long long unsigned int
  define: __BFLT16_MIN_EXP__=(-125)
  define: __INT_MAX__=0x7fffffff
  define: WIN32=1
  define: __nocona=1
  define: __code_model_medium__=1
  define: __INT64_TYPE__=long long int
  define: __FLT_MAX_EXP__=128
  define: WIN64=1
  define: __ORDER_BIG_ENDIAN__=4321
  define: __DBL_MANT_DIG__=53
  define: __SIZEOF_FLOAT128__=16
  define: __BFLT16_MANT_DIG__=8
  define: __DEC64_MIN__=1E-383DD
  define: __WINT_TYPE__=short unsigned int
  define: __UINT_LEAST32_TYPE__=unsigned int
  define: __SIZEOF_SHORT__=2
  define: __FLT32_NORM_MAX__=3.40282346638528859811704183484516925e+38F32
  define: __SSE__=1
  define: __LDBL_MIN_EXP__=(-16381)
  define: __FLT64_MAX__=1.79769313486231570814527423731704357e+308F64
  define: __DEC64X_MIN_EXP__=(-6142)
  define: __amd64__=1
  define: __WINT_WIDTH__=16
  define: __INT_LEAST64_WIDTH__=64
  define: __FLT32X_MAX_10_EXP__=308
  define: __WIN32=1
  define: __SIZEOF_INT128__=16
  define: __FLT16_MIN__=6.10351562500000000000000000000000000e-5F16
  define: __FLT64X_IS_IEC_60559__=1
  define: __GXX_CONSTEXPR_ASM__=1
  define: __WCHAR_UNSIGNED__=1
  define: __LDBL_MAX_10_EXP__=4932
  define: __ATOMIC_RELAXED=0
  define: __DBL_EPSILON__=double(2.22044604925031308084726333618164062e-16L)
  define: __INT_LEAST32_TYPE__=int
  define: __thiscall=__attribute__((__thiscall__))
  define: __UINT8_C(c)=c
  define: __FLT64_MAX_EXP__=1024
  define: __SIZEOF_WCHAR_T__=2
  define: __GNUC_PATCHLEVEL__=0
  define: __WINNT=1
  define: __FLT128_NORM_MAX__=1.18973149535723176508575932662800702e+4932F128
  define: __FLT64_NORM_MAX__=1.79769313486231570814527423731704357e+308F64
  define: __FLT128_HAS_QUIET_NAN__=1
  define: __INTMAX_MAX__=0x7fffffffffffffffLL
  define: __SSE3__=1
  define: __INT_FAST8_TYPE__=signed char
  define: __fastcall=__attribute__((__fastcall__))
  define: __FLT64X_MIN__=3.36210314311209350626267781732175260e-4932F64x
  define: __STDCPP_THREADS__=1
  define: __BFLT16_HAS_DENORM__=1
  define: __GNUC_STDC_INLINE__=1
  define: __FLT64_HAS_DENORM__=1
  define: __FLT32_EPSILON__=1.19209289550781250000000000000000000e-7F32
  define: __FLT16_HAS_DENORM__=1
  define: __DBL_DECIMAL_DIG__=17
  define: __STDC_UTF_32__=1
  define: __INT_FAST8_WIDTH__=8
  define: __FXSR__=1
  define: __FLT32X_MAX__=1.79769313486231570814527423731704357e+308F32x
  define: __DBL_NORM_MAX__=double(1.79769313486231570814527423731704357e+308L)
  define: __BYTE_ORDER__=__ORDER_LITTLE_ENDIAN__
  define: __MINGW64__=1
  define: __GCC_DESTRUCTIVE_SIZE=64
  define: __INTMAX_WIDTH__=64
  define: __FLT32_DIG__=6
  define: __UINT64_TYPE__=long long unsigned int
  define: __UINT32_C(c)=c ## U
  define: WINNT=1
  define: __FLT_DENORM_MIN__=1.40129846432481707092372958328991613e-45F
  define: __FLT128_IS_IEC_60559__=1
  define: __INT8_MAX__=0x7f
  define: __LONG_WIDTH__=32
  define: __DBL_MIN__=double(2.22507385850720138309023271733240406e-308L)
  define: __PIC__=1
  define: __INT32_MAX__=0x7fffffff
  define: __UINT_FAST32_TYPE__=unsigned int
  define: __FLT16_MANT_DIG__=11
  define: __FLT32X_NORM_MAX__=1.79769313486231570814527423731704357e+308F32x
  define: __CHAR32_TYPE__=unsigned int
  define: __FLT_MAX__=3.40282346638528859811704183484516925e+38F
  define: __SSE2__=1
  define: __BFLT16_NORM_MAX__=3.38953138925153547590470800371487867e+38BF16
  define: __INT32_TYPE__=int
  define: __SIZEOF_DOUBLE__=8
  define: __FLT_MIN_10_EXP__=(-37)
  define: __FLT64_MIN__=2.22507385850720138309023271733240406e-308F64
  define: __INT_LEAST32_WIDTH__=32
  define: __INTMAX_TYPE__=long long int
  define: __GLIBCXX_BITSIZE_INT_N_0=128
  define: __FLT32X_HAS_QUIET_NAN__=1
  define: __ATOMIC_CONSUME=1
  define: __GNUC_MINOR__=1
  define: __GLIBCXX_TYPE_INT_N_0=__int128
  define: __UINTMAX_MAX__=0xffffffffffffffffULL
  define: __FLT32X_DENORM_MIN__=4.94065645841246544176568792868221372e-324F32x
  define: __DBL_MAX_10_EXP__=308
  define: __LDBL_DENORM_MIN__=3.64519953188247460252840593361941982e-4951L
  define: __INT16_C(c)=c
  define: __STDC__=1
  define: __PTRDIFF_TYPE__=long long int
  define: __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16=1
  define: __LONG_MAX__=0x7fffffffL
  define: __FLT32X_MIN_10_EXP__=(-307)
  define: __UINTPTR_TYPE__=long long unsigned int
  define: __DEC64_SUBNORMAL_MIN__=0.000000000000001E-383DD
  define: __DEC128_MANT_DIG__=34
  define: __LDBL_MIN_10_EXP__=(-4931)
  define: __SSE_MATH__=1
  define: __SIZEOF_LONG_LONG__=8
  define: __FLT128_DECIMAL_DIG__=36
  define: __GCC_ATOMIC_LLONG_LOCK_FREE=2
  define: __USING_POSIXTHREAD__=1
  define: __FLT32_HAS_QUIET_NAN__=1
  define: __FLT_DECIMAL_DIG__=9
  define: __UINT_FAST16_MAX__=0xffff
  define: __LDBL_NORM_MAX__=1.18973149535723176502126385303097021e+4932L
  define: __GCC_ATOMIC_SHORT_LOCK_FREE=2
  define: __SIZE_MAX__=0xffffffffffffffffULL
  define: __UINT_FAST8_TYPE__=unsigned char
  define: __ATOMIC_ACQ_REL=4
  define: __ATOMIC_RELEASE=3
  define: __declspec(x)=__attribute__((x))
  define: _DEBUG
  define: UNICODE
  define: _UNICODE
  other: --g++
  other: --gnu_version=150100
  stdver: c++17
  intelliSenseMode: windows-gcc-x64
Update IntelliSense time (sec): 0.52
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/getFoldingRanges: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 7)
LSP: (invoked) cpptools/getFoldingRanges: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 7)
LSP: Sending response (id: 7)
LSP: (received) cpptools/getFoldingRanges: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 8)
LSP: (invoked) cpptools/getFoldingRanges: file:///c%3A/Users/bobkata75/Desktop/new-cpp/src/main.cpp (id: 8)
LSP: Sending response (id: 8)
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
LSP: (received) cpptools/didChangeVisibleTextEditors
LSP: (invoked) cpptools/didChangeVisibleTextEditors
Database safe to open.

Other Extensions

No response

Additional context

No response

[bobbrow]

I had the problem you described yesterday. I was using VS Code Insiders. What worked for me was updating VS Code. It's weird because the C++ extension commands were showing up in the command palette, but trying to run any of them failed. I'm not sure how you are getting the logs because the extension didn't start for me at all.

[sean-mcmanus]

The next time it repros, can you check the Help->Toggle Developer Tools->Console logging for errors that might be related -- that will usually show errors relating to failed activations. It's possible the extension host is crashing before or during activating our extension.

[dortamiguel]

I'm having this problem after updating xcode clang from 15 to 17. I updated vscode and cleared all my chaches but still I don't get intellisense

[sean-mcmanus]

@dortamiguel Are you able to locate/provide any additional error logging as I mentioned previously? What version of VS Code are you using? (Or are you using a non-VS Code editor?)

[RabbitSeries]

@sean-mcmanus I also got this problem now, saved logs.
Edit:
Any success recompile and launch won't erase the squiggles.
But after clear() in the developer tools' console, a ctrl + S (maybe I also recompiled once again, I can't easily reproduce) erased the squiggles.
Edit:
After that clear() everything seems to work fine, no need to update or reload window or reintall extension.