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Subject: btrfs-progs: add arg_strtou64 break library btrfs
From: "Dennis Lan (dlan)" <dennis.yxun@gmail.com>
To: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Cc: linux-btrfs@vger.kernel.org
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progs # cat btrfs_mini_tst.c
 /*
  * gcc -o btrfs_mini_tst btrfs_mini_tst.c -lbtrfs
  */

  char btrfs_read_and_process_send_stream ();
 int
 main ()
 {
 return btrfs_read_and_process_send_stream ();
 }

progs # gcc -o btrfs_mini_tst btrfs_mini_tst.c -lbtrfs
/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/../../../../lib64/libbtrfs.so:
undefined reference to `arg_strtou64'
collect2: error: ld returned 1 exit status


but if I also add file utils.c into libbtrfs, more undefined error occurs.