为什么这个 hello world 程序无法链接？

Question

#include <stdio.h>
int main() {
   printf("Hello, World!");
   return 0;
}

I installed VScode and gcc on Mac Silicon, tried running the above hello world program in C, but I get the following error:

Undefined symbols for architecture arm64:
  "_main", referenced from:
 implicit entry/start for main executable
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

When I run the following commands on the terminal I get this:

which gcc
/usr/bin/gcc

which gcc-11
/opt/homebrew/bin/gcc-11

I'm not sure if I installed the compiler incorrectly(first time trying C).

Answer 1

For just starting out, I recommend you just have a simple task like this in tasks.json (Terminal -> Configure Tasks):

{
  "tasks": [
    {
      "label": "Run my C",
      "type": "shell",
      "command": "gcc -o myoutput ${file} && ./myoutput",
      "group": {
           "kind": "build",
           "isDefault": true
       },

      }
    }
  ],
"version": "2.0.0"
}

This will compile it and immediately run ./myoutput (inside vscode's terminal). isDefault means that it is the default build task so you can run it by Ctrl+Shift+B (also under Terminal -> Run Build Task).