error when use the default preLaunchTask configuration and c++17.

[Tudyx]

• VSCode Version: 1.51.1
• OS Version: ubuntu 20.04.1 LTS

Steps to Reproduce:

1. Create a simple c++ file that use a c++17 feature
2. Terminal > Configure Default Build Task
3. Choose C/C++: g++ build active file.
4. add flag "-std=c++17" in args of tasks.json.
   Then the build work with Terminal > Run Build Task
5. Run > Add Configuration... and then choose C++ (GDB/LLDB).
6. Choose g++ build and debug active file.
7. Run > Start Debugging
   Then the build task don't work anymore : error in terminal saying than he don't find c++17 feature, for instance "error: ‘optional’ is not a member of ‘std’".

When i applied this 2 modification i able to build and run with Run > Start Debugging :

1. change in launch.json the "preLaunchTask" from "C/C++: g++ build active file" to "foo"
2. change in tasks.json the "label" from "C/C++: g++ build active file" to "foo"

My cpp file :

#include <iostream>
#include <optional>
int main() {
    std::optional<std::string> data; 
    std::cout << "Hello World!";
    return 0;
}

Does this issue occur when all extensions are disabled?: Yes/No

[weinand]

/extCpp

[vscode-triage-bot]

It looks like this is caused by the C++ extension. Please file it with the repository here. Make sure to check their issue reporting template and provide them relevant information such as the extension version you're using. See also our issue reporting guidelines for more information.

Happy Coding!