use cgo error

[Topthinking]

Description

gin + cgo = error

How to reproduce

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"net/http"
)

/*
int Add(int a, int b){
	return a + b;
}
 */
import "C"

func main()  {
	R := gin.Default()

	R.GET("/", func(context *gin.Context) {
		fmt.Println(C.Add(1,2))
		context.String(http.StatusOK,"hello world")
	})

	R.Run(":8080")
}

Expectations

Actual result

Environment

• go version: go1.17.2 darwin/amd64
• gin version (or commit ref):
• operating system:

[Topthinking]

Use native http module is normal

package main

import (
	"fmt"
	"net/http"
)

/*
int Add(int a, int b){
	return a + b;
}
 */
import "C"

func main()  {
	http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
		fmt.Println(C.Add(1,2),request.RequestURI)
		writer.Write([]byte("hello world"))
	})

	http.ListenAndServe(":8080",nil)
}

[Crushla]

I have no this mistake here