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Including `stdatomic.h` causes `size_t` to report the wrong type in Intellisense

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@Colengms y travaille déjà.

Depuis le 13/10/2026.

Évaluation

Difficulté
4/5
Temps estimé
3-5 jours
Accessibilité débutants
25/100
Type d'issue
Bug
Clarté
Plutôt claire
Activité
Active
Stack technique
c
Domaine
devtools

Piste de recherche

Start by reproducing with a minimal C file that includes stdatomic.h and declares size_t capacity = 0, then hover over size_t. The issue reports it resolving to typedef int size_t(bool) instead of unsigned long long, which the header-free case shows correctly. The configuration uses /experimental:c11atomics and /std:c17 with windowsSdkVersion 10.0.28000.0, so reproduce under those settings. Done means size_t resolves to the correct type with the header included, and the reporter's configuration is verified.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

bug Language Service
Environment
  • OS and Version: Windows 11 Pro, 26H2
  • VS Code Version: 1.141.0
  • C/C++ Extension Version: 1.34.4
  • If using SSH remote, specify OS of remote machine: N/A
Bug Summary and Steps to Reproduce

Bug Summary:

Including stdatomic.h causes havoc with the size_t type, causing Intellisense failures.

Steps to reproduce:

Create a c source file that includes stdatomic.h

Make a variable of size_t (e.g size_t capacity = 0) in the code.
Hover over size_t
It will report that size_t is defined as typedef int size_t(bool)
This is incorrect.

If you remove or comment out the stdatomic.h header and hover over size_t
It will report that size_t is defined as unsigned long long size_t
This is correct.

Apparently, this is an issue in Visual Studio as well.

Configuration and Logs
{
    "configurations": [
        {
            "name": "Win32",
            "includePath": [
                "${workspaceFolder}/**",
                "${env:INCLUDE}"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "windowsSdkVersion": "10.0.28000.0",
            "compilerPath": "cl.exe",
            "cStandard": "c11",
            "cppStandard": "c++23",
            "intelliSenseMode": "windows-msvc-x64",
            "compilerArgs": [
                "/std:c17",
                "/experimental:c11atomics"
            ]
        }
    ],
    "version": 4
}
Other Extensions

N/A

Additional context

Intellisense is completely confused about how to parse the stdatomic.h header, or more precisely, the platform specific of the header that stdatomic.h includes.

Langage dominant
TypeScript
Étoiles
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Forks
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Merge moyen
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PR mergées (30 j)
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