Fix undefined loff_t in test_write_cache.c on alpine

This fixes #899. Seems that Alpine (and maybe Fedora) need
_GNU_SOURCE to get loff_t.

diff --git a/test/test_write_cache.c b/test/test_write_cache.c
index 92471f1f56a5f2bc9ed14737a2120ffdae998df7..6b12a9dbd68401df866da40835ee7a24059efb4a 100644 (file)
--- a/test/test_write_cache.c
+++ b/test/test_write_cache.c
@@ -9,6 +9,8 @@
 
 #define FUSE_USE_VERSION 30
 
+#define _GNU_SOURCE /* for loff_t */
+
 #include <fuse_config.h>
 #include <fuse_lowlevel.h>
 #include <stdio.h>