IntelliSense errors with Parsing the .pb.h header file generated from the protobuffer proto file

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#14,116 opened on Dec 23, 2025 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 30/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: cpp, typescript
Domain: devtools, tooling

Research direction

Start with the minimal .pb.h snippet and the diagnostic on PROTOBUF_NAMESPACE_OPEN, using the reported cStandard, cppStandard, and intelliSenseMode settings. Reproduce with protobuf-include.zip and the listed VS Code and C/C++ extension versions; done means the generated header no longer shows this IntelliSense error.

Written by the indexing model from the issue text.

Description

bug Language Service parser verified Visual Studio

Environment

OS and Version: CentOS7
VS Code Version: 1.98.2
C/C++ Extension Version: 1.29.3

Bug Summary and Steps to Reproduce

Bug Summary:
Opening the .pb.h header file generated from the .proto file of Protobuf, there is IntelliSense error: this declaration has no storage class or type specifier.

My protobuf version is 3.6.0
The minimal case might look like this：

#include <google/protobuf/port_def.inc>
#include <google/protobuf/port_undef.inc>
#include <google/protobuf/port_def.inc>
PROTOBUF_NAMESPACE_OPEN
namespace internal {
class AnyMetadata;
}  // namespace internal
PROTOBUF_NAMESPACE_CLOSE

Error displayed on macro PROTOBUF_NAMESPACE_OPEN
The attachment here is the header file provided by protobuf
protobuf-include.zip

Configuration and Logs

{
    "configurations": [
        {
            "name": "Linux",
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "cStandard": "c11",
            "cppStandard": "c++11",
            "intelliSenseMode": "linux-gcc-x64"
        }
    ],
    "version": 4
}

Other Extensions

No response

Additional context

No response

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