vscode c++ debug refuses to respect c++ standard
alligatorjazz opened this issue · comments
Environment
- OS and version: MacOS Sonoma 14.0
- VS Code: 1.88.1
- C/C++ extension: v1.20.4
- OS and version of remote machine (if applicable): N/A
- GDB / LLDB version: lldb-1500.0.21.4
Bug Summary and Steps to Reproduce
Bug Summary:
"C/C++ Run C/C++ File" includes an argument that sets the C++ standard to "gnu++14", even after setting it to "c++20" in the extension settings and task arguments.
Steps to reproduce:
- Create a new C++ project with the "Cpp Standard" set to c++20 in the extension settings.
- Add "--std=c++20" to the
tasks.jsonarguments array. - Try to run a file with c++20 features (in my case, the main file repo linked here where i try to use std::format)
- The task will throw the following error:
* Executing task: C/C++: clang build active file
Starting build...
/usr/bin/clang -std=gnu++14 --std=c++20 -fcolor-diagnostics -fansi-escape-codes -g /Users/bright-silicon/lab/tictac-online/main.cpp -o /Users/bright-silicon/lab/tictac-online/main
/Users/bright-silicon/lab/tictac-online/main.cpp:30:21: error: no member named 'format' in namespace 'std'
std::cout << std::format(" {} | ", c + 1);
~~~~~^
/Users/bright-silicon/lab/tictac-online/main.cpp:33:22: error: no member named 'format' in namespace 'std'
std::cout << std::format("{} |", board[c * r]);
~~~~~^
2 errors generated.
Build finished with error(s).
Debugger Configurations
// tasks.json
{
"tasks": [
{
"type": "cppbuild",
"label": "C/C++: clang build active file",
"command": "/usr/bin/clang",
"args": [
"--std=c++20",
"-fcolor-diagnostics",
"-fansi-escape-codes",
"-g",
"${file}",
"-o",
"${fileDirname}/${fileBasenameNoExtension}"
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": [
"$gcc"
],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "Task generated by Debugger."
}
],
"version": "2.0.0"
}
```json
// launch.json{
"version": "0.2.0",
"configurations": [
{
"name": "C/C++: clang build and debug active file",
"type": "cppdbg",
"request": "launch",
"program": "${fileDirname}/${fileBasenameNoExtension}",
"args": [],
"stopAtEntry": false,
"cwd": "${fileDirname}",
"environment": [],
"externalConsole": false,
"MIMode": "lldb",
"preLaunchTask": "C/C++: clang build active file"
}
]
}
### Debugger Logs
```shell
* Executing task: C/C++: clang build active file
Starting build...
/usr/bin/clang -std=gnu++14 --std=c++20 -fcolor-diagnostics -fansi-escape-codes -g /Users/bright-silicon/lab/tictac-online/main.cpp -o /Users/bright-silicon/lab/tictac-online/main
/Users/bright-silicon/lab/tictac-online/main.cpp:30:21: error: no member named 'format' in namespace 'std'
std::cout << std::format(" {} | ", c + 1);
~~~~~^
/Users/bright-silicon/lab/tictac-online/main.cpp:33:22: error: no member named 'format' in namespace 'std'
std::cout << std::format("{} |", board[c * r]);
~~~~~^
2 errors generated.
Build finished with error(s).
Other Extensions
No response
Additional Information
No clue how to tackle this further - every guide either told me to change the standard in the extension settings or add c++20 to the clang arguments, neither of which remove the initial -std=gnu++14 argument which seems to be added automatically and separately from the arguments in the tasks.json. The actual repo I am having issues with is linked here.
It looks like you might have an extra hyphen in your command argument. Can you try -std=c++20 instead of --std=c++20?
It looks like you might have an extra hyphen in your command argument. Can you try
-std=c++20instead of--std=c++20?
Tried that, exactly the same result. Still doesn't remove the initial -std=gnu++14.
Starting build...
/usr/bin/clang -std=gnu++14 -std=c++20 -fcolor-diagnostics -fansi-escape-codes -g /Users/bright-silicon/lab/tictac-online/main.cpp -o /Users/bright-silicon/lab/tictac-online/main
/Users/bright-silicon/lab/tictac-online/main.cpp:30:21: error: no member named 'format' in namespace 'std'
std::cout << std::format(" {} | ", c + 1);
~~~~~^
/Users/bright-silicon/lab/tictac-online/main.cpp:33:22: error: no member named 'format' in namespace 'std'
std::cout << std::format("{} |", board[c * r]);
~~~~~^
2 errors generated.
Build finished with error(s).
@alligatorjazz A 2nd -std should replace any earlier ones (it does for me).
@alligatorjazz Are you #including the header? UPDATE: I found your example code (you are including it).
@alligatorjazz Are you using clang version 17 or newer? It was only taken out of experimental with that version.
@alligatorjazz The Apple clang that comes with Mac is still LLVM version 16. You could try adding arg -fexperimental-library to see if that works.
This issue has been closed because it needs more information and has not had recent activity.