IntelliSense reports incorrect errors when using eigen3 library

[AlBrP]

Bug type: Language Service

• OS and Version: Linux arm64 5.10.27-rt36-v8
• VS Code Version: 1.55.2
• C/C++ Extension Version: 1.3.1

I am programming with eigen3 library on vscode on Raspberry Pi 4B (64 bit Raspberry Pi OS) and here are the bugs:
the IntelliSense reports errors after I create、fill、print a simple 2*2 matrix, but I can build and run the code , print the matrix correctly.
I test these lines of codes in a x86 Ubuntu environment vscode, but no errors report.
I also use different intelliSenseMode、Cppstandrad、compilerPath to test but it still reports errors.

Steps to reproduce

1. Include the eigen library.
2. Create a simple 2*2 matrix, fill it with integers and print it.
3. See error.

Expected behavior
IntelliSense should not mark these as errors.

Screenshots
the errors report:


the running result:

Additional context
Also, although the eigen library autocomplete works, it lacks many options compared to vscode in x86 Ubuntu environment, are these bugs related?
Thanks in advance!

[lordofutopia]

Similar issues here.

• OS and Version: Ubuntu 18.04.5 LTS on Jetson Xavier (aarch64)
• VS Code Version: 1.55.2
• C/C++ Extension Version: 1.3.1
  Got the following errors, however, the codes could be complied and run correctly.
  

[AlBrP]

I tested my codes in a 32 bit Raspberry Pi OS vscode, the incorrect errors disappear, I think probably the problem comes from the OS?

[michelleangela]

@AlBrP and @lordofutopia Could you provide the following logs to help us further investigate?

• Logs from running C/C++: Log Diagnostics from the VS Code command palette

• Logs from enabling the language server logging

[AlBrP]

Here are the logs from running C/C++: Log Diagnostics from the VS Code command palette:

Here are the logs from enabling the language server logging:

Hope I have understood you correctly.

[lordofutopia]

Here are mine.
C/C++: Log Diagnostics

-------- Diagnostics - 4/23/2021, 9:17:05 PM
Version: 1.3.1
Current Configuration:
{
    "name": "Linux",
    "includePath": [
        "${workspaceFolder}/**",
        "/usr/include/eigen3",
        "/usr/local/include",
        "/usr/include/"
    ],
    "defines": [],
    "compilerPath": "/usr/bin/aarch64-linux-gnu-g++",
    "cStandard": "gnu11",
    "cppStandard": "gnu++14",
    "intelliSenseMode": "linux-gcc-arm64",
    "compilerArgs": [],
    "intelliSenseModeIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "compilerPathIsExplicit": true,
    "browse": {
        "path": [
            "${workspaceFolder}/**",
            "/usr/include/eigen3",
            "/usr/local/include",
            "/usr/include/"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
Translation Unit Mappings:
[ /home/zaas/Test/eigen_test/helloworld.cpp ]:
    /home/zaas/Test/eigen_test/helloworld.cpp
Translation Unit Configurations:
[ /home/zaas/Test/eigen_test/helloworld.cpp ]:
    Process ID: 9601
    Memory Usage: 202 MB
    Compiler Path: /usr/bin/aarch64-linux-gnu-g++
    Includes:
        /usr/include/eigen3
        /usr/include/c++/7
        /usr/include/aarch64-linux-gnu/c++/7
        /usr/include/c++/7/backward
        /usr/lib/gcc/aarch64-linux-gnu/7/include
        /usr/local/include
        /usr/lib/gcc/aarch64-linux-gnu/7/include-fixed
        /usr/include/aarch64-linux-gnu
        /usr/include
    Standard Version: c++14
    IntelliSense Mode: linux-gcc-arm64
    Other Flags:
        --g++
        --gnu_version=70500
Total Memory Usage: 202 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 19557

Language logging server output:

File exclude: **/.vscode
File exclude: **/.git
File exclude: **/.svn
File exclude: **/.hg
File exclude: **/CVS
File exclude: **/.DS_Store
Search exclude: **/node_modules
Search exclude: **/bower_components
Search exclude: **/*.code-search
Populate include completion cache.
Discovering files...
  Processing folder (recursive): /usr/include/
  Processing folder (recursive): /usr/lib/gcc/aarch64-linux-gnu/7/include/
  Processing folder (recursive): /usr/lib/gcc/aarch64-linux-gnu/7/include-fixed/
  Processing folder (recursive): /usr/local/include/
  Processing folder (recursive): /home/zaas/Test/eigen_test/
  Processing folder (recursive): /usr/include/eigen3/
  Discovering files: 19557 file(s) processed
  0 file(s) removed from database
Done discovering files.
Parsing remaining files...
  Parsing: 0 files(s) processed
Done parsing remaining files.
idle loop: reparsing the active document
Checking for syntax errors: file:///home/zaas/Test/eigen_test/helloworld.cpp
Queueing IntelliSense update for files in translation unit of: /home/zaas/Test/eigen_test/helloworld.cpp
Error squiggle count: 8
Update IntelliSense time (sec): 0.274
idle loop: reparsing the active document
Checking for syntax errors: file:///home/zaas/Test/eigen_test/helloworld.cpp
Queueing IntelliSense update for files in translation unit of: /home/zaas/Test/eigen_test/helloworld.cpp
Error squiggle count: 8
Update IntelliSense time (sec): 0.273
IntelliSense Engine = Default.
Enhanced Colorization is enabled.
Error squiggles are enabled if all header dependencies are resolved.
Autocomplete is enabled.
cpptools/didChangeCppProperties
$/setTraceNotification

[AlBrP]

Here are mine.
C/C++: Log Diagnostics

-------- Diagnostics - 4/23/2021, 9:17:05 PM
Version: 1.3.1
Current Configuration:
{
    "name": "Linux",
    "includePath": [
        "${workspaceFolder}/**",
        "/usr/include/eigen3",
        "/usr/local/include",
        "/usr/include/"
    ],
    "defines": [],
    "compilerPath": "/usr/bin/aarch64-linux-gnu-g++",
    "cStandard": "gnu11",
    "cppStandard": "gnu++14",
    "intelliSenseMode": "linux-gcc-arm64",
    "compilerArgs": [],
    "intelliSenseModeIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "compilerPathIsExplicit": true,
    "browse": {
        "path": [
            "${workspaceFolder}/**",
            "/usr/include/eigen3",
            "/usr/local/include",
            "/usr/include/"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
Translation Unit Mappings:
[ /home/zaas/Test/eigen_test/helloworld.cpp ]:
    /home/zaas/Test/eigen_test/helloworld.cpp
Translation Unit Configurations:
[ /home/zaas/Test/eigen_test/helloworld.cpp ]:
    Process ID: 9601
    Memory Usage: 202 MB
    Compiler Path: /usr/bin/aarch64-linux-gnu-g++
    Includes:
        /usr/include/eigen3
        /usr/include/c++/7
        /usr/include/aarch64-linux-gnu/c++/7
        /usr/include/c++/7/backward
        /usr/lib/gcc/aarch64-linux-gnu/7/include
        /usr/local/include
        /usr/lib/gcc/aarch64-linux-gnu/7/include-fixed
        /usr/include/aarch64-linux-gnu
        /usr/include
    Standard Version: c++14
    IntelliSense Mode: linux-gcc-arm64
    Other Flags:
        --g++
        --gnu_version=70500
Total Memory Usage: 202 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 19557

Language logging server output:

File exclude: **/.vscode
File exclude: **/.git
File exclude: **/.svn
File exclude: **/.hg
File exclude: **/CVS
File exclude: **/.DS_Store
Search exclude: **/node_modules
Search exclude: **/bower_components
Search exclude: **/*.code-search
Populate include completion cache.
Discovering files...
  Processing folder (recursive): /usr/include/
  Processing folder (recursive): /usr/lib/gcc/aarch64-linux-gnu/7/include/
  Processing folder (recursive): /usr/lib/gcc/aarch64-linux-gnu/7/include-fixed/
  Processing folder (recursive): /usr/local/include/
  Processing folder (recursive): /home/zaas/Test/eigen_test/
  Processing folder (recursive): /usr/include/eigen3/
  Discovering files: 19557 file(s) processed
  0 file(s) removed from database
Done discovering files.
Parsing remaining files...
  Parsing: 0 files(s) processed
Done parsing remaining files.
idle loop: reparsing the active document
Checking for syntax errors: file:///home/zaas/Test/eigen_test/helloworld.cpp
Queueing IntelliSense update for files in translation unit of: /home/zaas/Test/eigen_test/helloworld.cpp
Error squiggle count: 8
Update IntelliSense time (sec): 0.274
idle loop: reparsing the active document
Checking for syntax errors: file:///home/zaas/Test/eigen_test/helloworld.cpp
Queueing IntelliSense update for files in translation unit of: /home/zaas/Test/eigen_test/helloworld.cpp
Error squiggle count: 8
Update IntelliSense time (sec): 0.273
IntelliSense Engine = Default.
Enhanced Colorization is enabled.
Error squiggles are enabled if all header dependencies are resolved.
Autocomplete is enabled.
cpptools/didChangeCppProperties
$/setTraceNotification

Hi lordofutopia, have you solved your problem? My vscode instellsense still have bugs...... 😭

[sean-mcmanus]

I repro the issue after setting "compilerPath": "/usr/bin/aarch64-linux-gnu-g++" and using code

#include <eigen3/Eigen/Eigen>
#include <iostream>
using namespace std;

int main()
{
    Eigen::Matrix<int, 2, 2> a;
    a << 2,2,2,2;
    cout << a << endl;
    return 0;
}

It's advisable to remove all the references to system includes from your includePath (except for possibly subfolders like /usr/include/eigen3) because otherwise the system include paths could possibly be in the wrong order, but that doesn't appear to be causing the bug here.