<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/75984>75984</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            unexpected warning from clang
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          BaoshanPang
      </td>
    </tr>
</table>

<pre>
    Can someone tell me why clang report a warning here? isn't lludump.a a type of "unsigned long long"? Thanks.

#include <stdio.h>

typedef unsigned char u8;
typedef unsigned char u08;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned long long u64;

struct llu_dump_test {
  u64 a : 4;
  u64 b : 56;
  u64 c : 4;
};

int main() {
  struct llu_dump_test lludump;

 printf("%llu\n", lludump.a);

  return 0;
}
bpang@US-BPANG:~$ clang -c e.c
e.c:18:20: warning: format specifies type 'unsigned long long' but the argument has type 'int' [-Wformat]
  printf("%llu\n", lludump.a);
          ~~~~     ^~~~~~~~~
          %d
1 warning generated.

</pre>
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