Visual Studio Code c++11 扩展警告

Question

I am in the process of learning c++ and I'm using visual studio code for Mac. I use Code Runner to run my program. My problem is that when I use something from c++11 like "auto" for variable declaration, visual studio code gives me a warning like this, but if I try running it on Xcode or Eclipse it doesn't:

warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
for(auto y: nstrVec)

This is the program if it's necessary:

#include <iostream>
#include <cstdlib>
#include <string>
#include <vector>
#include <numeric>
#include <sstream>

int main(){

std::vector<std::string> nstrVec(10);

std::string str("I'm a string");
nstrVec[0] = str;

std::cout << str.at(0) << "\n";
std::cout << str.front() << " " << str.back() << "\n";
std::cout << "Length " << str.length() << "\n";
// copies all characters after the fourth 
std::string str2(str, 4);

for(auto y: nstrVec)
    if(y != "")
        std::cout << y << "\n";

return 0;
}

And this is the c_cpp_proprerties.json file:

{
"configurations": [
    {
        "name": "Mac",
        "includePath": [
            "${workspaceFolder}/**",
                 "/System/Library/Frameworks/Kernel.framework/Versions/A/Headers"
        ],
        "defines": [],
        "macFrameworkPath": [
            "/System/Library/Frameworks",
            "/Library/Frameworks"
        ],
        "compilerPath": "/usr/bin/clang",
        "cStandard": "c11",
        "cppStandard": "c++17",
        "intelliSenseMode": "clang-x64"
    }
],
"version": 4
}

Answer 1

In VS Code:

File>>Preference>>Settings>>Extensions

find C_Cpp>Default:Cpp Standard drop down menu

set that to c++11

Answer 2

I had the same problem, but solved it using set vscode-user-settings <>

"clang.cxxflags": ["-std=c++14"]

Answer 3

I spent so long today trying to figure out why I was getting this error and no where had the exact answer I required so I thought I'd post it here just in case I can save anyone the hassle.

If you're using code runner, look in user settings and set:

 "code-runner.executorMap" : { "cpp" : "cd $dir && g++ -std=c++17 $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt" }

The pertinent bit being "g++ -std=c++17".

This is providing of course you can compile your programme in shell using Daniel's solution above but not in VScode + and using code runner.

Answer 4

For everyone who comes to this question to find a quick answer (like I did):

The following compiler command should compile your program main.cpp with the latest C++ standard (c++17) and should get rid of warning messages like the one described above:

g++ -std=c++17 -g main.cpp -o main

It is mentioned multiple times in the comments, but I think this question should have a regular answer.

Answer 5

I used this to solve my problem. Open your terminal

bash

echo "alias g++='g++ -std=c++17'" >> ~/.bashrc
source ~/.bashrc

zsh

echo "alias g++='g++ -std=c++17'" >> ~/.zshrc
source ~/.zshrc

Answer 6

如果您在 VS 中使用 CPH 判断扩展，请在 Cph › 语言 › Cpp：扩展设置中的 Args 中添加-std=c++11

Answer 7

We only have to link g++ compiler with g++-11 compiler. Below is the process how to do it on macbook.

For solution click here

If this not works then refer to this video: https://youtu.be/CZ7Mf7qxbIU

Answer 8

If you're using CPH, add this line to Cph >> Language >> Cpp: Args

-std=c++17

If it doesn't work for you, also go to File >> Preference >> Settings >> Extensions >> C_Cpp >> Default:Cpp_Standard and set that to c++17

Answer 9

None of the answers here worked for me on Mac that were entirely within VSCode (I didn't want to modify my.zshrc file).

What did work though, was adding argument --std=c++20 for the clangd: Fallback Flags under Extensions > clangd , then restarting VSCode.