How to fix "undefined symbols for architecture arm64" - c++

Question

I'm running VS Code on MacOS, and I'm using clang to compile a simple "Hello World!" program in C++. However, when I try to run my program, VS Code gives me the following error message: Undefined symbols for architecture arm64: followed by dozens of references to the std library. At the bottom of the terminal, it says:
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Build finished with error(s).
The terminal process terminated with exit code: -1.
(a) What does this mean? and (b) how can I fix it?
HelloWorld.cpp
#include <iostream>
using namespace std;
int main()
{
cout << "Hello World!" << endl;
return 0;
}
tasks.json
{
"tasks": [
{
"type": "cppbuild",
"label": "C/C++: clang build active file",
"command": "/usr/bin/clang",
"args": [
"-g",
"${file}",
"-o",
"${fileDirname}/${fileBasenameNoExtension}"
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": [
"$gcc"
],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "Task generated by Debugger."
}
],
"version": "2.0.0"
}
launch.json
{
"version": "0.2.0",
"configurations": [
{
"name": "clang - Build and debug active file",
"type": "cppdbg",
"request": "launch",
"program": "${workspaceFolder}/HelloWorld.cpp",
"args": [],
"stopAtEntry": false,
"cwd": "${fileDirname}",
"environment": [],
"externalConsole": false,
"MIMode": "lldb",
"preLaunchTask": "C/C++: clang build active file"
}
]
}
Thanks!

Answer 1

If you have multiple CPP files in the project then you need to add "${fileDirname}/*.cpp"
tasks.json
"version": "2.0.0",
"tasks": [
{
"type": "shell",
"label": "clang++ build active file",
"command": "/usr/bin/clang++",
"args": [
"-std=c++17",
"-stdlib=libc++",
"-g",
"${fileDirname}/*.cpp",
// "${file}",
"-o",
"${fileDirname}/${fileBasenameNoExtension}"
],
"options": {
"cwd": "${workspaceFolder}"
},
"problemMatcher": ["$gcc"],
"group": {
"kind": "build",
"isDefault": true
}
}
]
}
If you're having a vector; error from vscode also add the c_cpp_properties.json file in .vscode directory :
{
"configurations": [
{
"name": "Mac",
"includePath": [
"${workspaceFolder}/**"
],
"defines": [
],
"macFrameworkPath": [
"/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks"
],
"compilerPath": "/usr/bin/clang",
"cStandard": "c11",
"cppStandard": "c++17",
"intelliSenseMode": "clang-x64"
}
],
"version": 4
}