Type: Bug

Problem Description:

I am experiencing persistent issues with my C++ development environment in Visual Studio Code, specifically related to compiler standard recognition and executable updates.

consteval Keyword Not Recognized:

Initially, C++20 features like consteval were not recognized by the compiler, resulting in errors like "this declaration has no storage class or type specifier".

This occurred even when the tasks.json file was configured to use -std=c++20 for g++.exe.

Executable Not Updating/Running Correctly:

Even after successfully configuring tasks.json and seeing "Build finished successfully" in the VS Code terminal, the generated .exe file (e.g., rooster.exe) frequently does not reflect the latest code changes.

When I run the executable (e.g., .\rooster.exe), it often executes a previous version of the code, displaying old output, rather than the expected output from the most recently compiled source.

Troubleshooting Steps Already Taken:

tasks.json verified: Confirmed that -std=c++20 is correctly set in tasks.json for the g++.exe build task.

Explicit Build Task Execution: Always explicitly selected the "Build with GCC 14.2.0" task.

Source File Verification: Ensured the correct .cpp file is being compiled.

Typo Correction: All code typos (e.g., std::end1 to std::endl) have been corrected.

Manual Executable Deletion: Tried manually deleting the .exe file (del rooster.exe) before rebuilding.

Unique Executable Name: Attempted compiling to a new, unique .exe filename to bypass potential file locking.

Manual Compilation: Attempted compiling directly from the VS Code integrated terminal using the exact g++.exe command from tasks.json.

VS Code Restart: Restarted VS Code multiple times.

C/C++ Extension Settings: Checked "C/C++: Edit Configurations (UI)" to ensure C++ Standard is set to "C++20" and compiler path is correct.

Environment Details:

VS Code Version: (You can find this in Help -> About)

C/C++ Extension Version: (Go to Extensions, search for C/C++, click on it, version is listed)

Operating System: Windows 11

Compiler Used: g++.exe from winlibs-x86_64-posix-seh-gcc-15.1.0-mingw-w64ucrt-13.0.0-r2\mingw64\bin\g++.exe (GCC 14.2.0)

tasks.json Snippet: {
"type": "cppbuild",
"label": "Build with GCC 14.2.0",
"command": "C:\Users\waghm\Downloads\winlibs-x86_64-posix-seh-gcc-15.1.0-mingw-w64ucrt-13.0.0-r2\mingw64\bin\g++.exe",
"args": [
"-g",
"-std=c++20",
"${workspaceFolder}\*.cpp", // Or "${workspaceFolder}\main.cpp" if you changed it
"-o",
"${fileDirname}\my_new_app.exe" // Or "rooster.exe"
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": [
"$gcc"
],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "compiler: C:\Users\waghm\Downloads\winlibs-x86_64-posix-seh-gcc-15.1.0-mingw-w64ucrt-13.0.0-r2\mingw64\bin\g++.exe"
}

VS Code version: Code 1.102.2 (c306e94, 2025-07-22T12:15:48.520Z)
OS version: Windows_NT x64 10.0.26100
Modes:

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