From 4df42ba9fb2131bb238ee74565d0a80fb7a1b394 Mon Sep 17 00:00:00 2001
From: Xiang Xiao <xiaoxiang@xiaomi.com>
Date: Tue, 11 Aug 2020 21:43:46 +0800
Subject: [PATCH] libc/ftw: Fix error: cast between incompatible function types
 from 'ftw_cb_t' nftw_cb_t

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I9e617ac04127e1e9126de2e3d32b35f2c6d636c0
---
 libs/libc/dirent/lib_ftw.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/libs/libc/dirent/lib_ftw.c b/libs/libc/dirent/lib_ftw.c
index 4356c837f6..1d5284f100 100644
--- a/libs/libc/dirent/lib_ftw.c
+++ b/libs/libc/dirent/lib_ftw.c
@@ -35,5 +35,12 @@ int ftw(FAR const char *path, ftw_cb_t fn, int fdlimit)
    * actually undefined, but works on all real-world machines.
    */
 
-  return nftw(path, (nftw_cb_t)fn, fdlimit, FTW_PHYS);
+  union
+  {
+    ftw_cb_t  ftw;
+    nftw_cb_t nftw;
+  } u;
+
+  u.ftw = fn;
+  return nftw(path, u.nftw, fdlimit, FTW_PHYS);
 }