Re: undefined reference to "main"

[FeepingCreature via Digitalmars-d-learn]

On Wednesday, 5 April 2023 at 09:19:17 UTC, Alexander Zhirov 
wrote:
How to compile the example given in the book correctly? When 
compiling, an error occurs that the main function is missing. 
If I replace `shared static this()` with `void main()', then 
everything starts. What does the compilation string in `dub` 
and `dmd` look like correctly?

```d
import vibe.d;
shared static this()
{
  auto settings = new HTTPServerSettings;
  settings.port = 8080;
  settings.bindAddresses = ["::1", "127.0.0.1"];
  listenHTTP(settings, &hello);

  logInfo("Please open http://127.0.0.1:8080/ in your 
browser.");
}

void hello(HTTPServerRequest req, HTTPServerResponse res)
{
  res.writeBody("Hello, World!");
}
```

This seems to work for me:

```d
/+ dub.json: {
    "name": "test",
    "dependencies": {
        "vibe-d": "*"
    }
} +/
import vibe.d;

shared static this()
{
  auto settings = new HTTPServerSettings;
  settings.port = 8080;
  settings.bindAddresses = ["::1", "127.0.0.1"];
  listenHTTP(settings, &hello);

  logInfo("Please open http://127.0.0.1:8080/ in your browser.");
}

void main() {
    runApplication;
}

void hello(HTTPServerRequest req, HTTPServerResponse res)
{
  res.writeBody("Hello, World!");
}
```

Run with

```
dub run --single test.d
```