From 4f3862db82033c393b9565956b33fa88b9d982ee Mon Sep 17 00:00:00 2001
From: Giuseppe Scrivano <gscrivan@redhat.com>
Date: Tue, 23 Jul 2019 16:02:14 +0200
Subject: [PATCH] build: fix build with older versions of libfuse

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
---
 configure.ac | 23 +++++++++++++++++++++++
 main.c       |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/configure.ac b/configure.ac
index 5ad5629..8a843e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,6 +32,29 @@ AC_DEFINE([USE_DIFF_HASH], 1, [Use the same hashing function as GNU diff])
 
 PKG_CHECK_MODULES([FUSE], [fuse3 >= 3.2.1], [AC_DEFINE([HAVE_FUSE], 1, [Define if libfuse is available])], [AC_MSG_ERROR([*** libfuse not found])]])
 
+old_CFLAGS=$CFLAGS
+old_LDFLAGS=$LDFLAGS
+CFLAGS=$pkg_cv_FUSE_CFLAGS
+LDFLAGS=$pkg_cv_FUSE_LDFLAGS
+AC_COMPILE_IFELSE(
+[
+AC_LANG_SOURCE([
+#define FUSE_USE_VERSION 32
+#include <fuse_lowlevel.h>
+void foo()
+{
+        struct fuse_file_info fi;
+        fi.cache_readdir = 1;
+}])
+],
+[cache_readdir=1],
+[cache_readdir=0])
+CFLAGS=$old_CFLAGS
+LDFLAGS=$old_LDFLAGS
+
+AC_DEFINE_UNQUOTED([HAVE_FUSE_CACHE_READDIR], $cache_readdir, [Define if libfuse is available])
+
+
 AC_FUNC_ERROR_AT_LINE
 AC_FUNC_MALLOC
 AC_CHECK_FUNCS([open_by_handle_at error memset strdup copy_file_range])
diff --git a/main.c b/main.c
index 4b6b19e..45c3505 100644
--- a/main.c
+++ b/main.c
@@ -1744,7 +1744,9 @@ ovl_opendir (fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
   if (get_timeout (lo) > 0)
     {
       fi->keep_cache = 1;
+#if HAVE_FUSE_CACHE_READDIR
       fi->cache_readdir = 1;
+#endif
     }
   fuse_reply_open (req, fi);
   return;