What steps will reproduce the problem?

When writing small wrapper functions for cgo directly in the comment above import
"C", it's useful if cgo could produce all the output from gcc in case of an
error. For this code:

/*
#include <stdio.h>
#include <infiniband/verbs.h>
struct ibv_device **my_ibv_get_device_list(int *num_devices) {
  struct ibv_device** devs = ibv_get_device_list(num_devices);
  printf("devs=%p\n", devs);
  printf("devs[0].node_type=%d\n", *devs[0].node_type);
  return devs;
}
*/
import "C"

I get:

gcc produced unexpected output:
<stdin>: In function 'my_ibv_get_device_list':

so I know something is wrong in my little wrapper, but I don't know what.

Which compiler are you using (5g, 6g, 8g, gccgo)?

6g

Which operating system are you using?

linux

Which revision are you using?  (hg identify)

tip