I met some problem about pthread.
I wrote a cgo demo which use some pthread_* function, but it compile failed
ccode.c
```
# include <stdio.h>
# include "ccode.h"
# include <pthread.h>
int try_pthread(){
pthread_t id;
int ret, i = 0;
ret = pthread_create(&id,NULL,(void *)thread,NULL);
for(i=0;i<=5;i++)
printf("This is main thread %d\n",i);
pthread_join(id,NULL);
pthread_once(id, NULL);
return 0;
}
void thread()
{
int i=0;
for(i=0;i<=5;i++)
printf("this is thread %d\n",i);
}
```
main.go
```
package main
/*
#cgo CFLAGS: -I./
#cgo LDFLAGS: -L./
#include "ccode.h"
*/
import "C"
func main() {
_ = C.try_pthread()
}
```
the `pthread_create` can be searched, but the other two functions report
this:
ccode.c:11: error: undefined reference to 'pthread_join'
ccode.c:12: error: undefined reference to 'pthread_once'
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