[PATCH] erofs-utils: avoid _LARGEFILE64_SOURCE and _GNU_SOURCE redefinition

[Gao Xiang]

From: Gao Xiang <gaoxiang25 at huawei.com>

This patch can be used to resolve the following build errors:

compress.c:10: error: "_LARGEFILE64_SOURCE" redefined [-Werror]
 #define _LARGEFILE64_SOURCE

<command-line>: note: this is the location of the previous definition

io.c:9: error: "_LARGEFILE64_SOURCE" redefined [-Werror]
 #define _LARGEFILE64_SOURCE

<command-line>: note: this is the location of the previous definition

Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>
---
 lib/compress.c | 2 ++
 lib/io.c       | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/lib/compress.c b/lib/compress.c
index 8337487..b14ff17 100644
--- a/lib/compress.c
+++ b/lib/compress.c
@@ -7,7 +7,9 @@
  * Created by Miao Xie <miaoxie at huawei.com>
  * with heavy changes by Gao Xiang <gaoxiang25 at huawei.com>
  */
+#ifndef _LARGEFILE64_SOURCE
 #define _LARGEFILE64_SOURCE
+#endif
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
diff --git a/lib/io.c b/lib/io.c
index 52f9424..5b998d8 100644
--- a/lib/io.c
+++ b/lib/io.c
@@ -6,8 +6,12 @@
  *             http://www.huawei.com/
  * Created by Li Guifu <bluce.liguifu at huawei.com>
  */
+#ifndef _LARGEFILE64_SOURCE
 #define _LARGEFILE64_SOURCE
+#endif
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include "erofs/io.h"
-- 
2.20.1