diff --git a/common/commit-mgr.c b/common/commit-mgr.c
index 32766ca8b..7ecde9cb7 100644
--- a/common/commit-mgr.c
+++ b/common/commit-mgr.c
@@ -141,10 +141,7 @@ seaf_commit_from_data (const char *id, char *data, gsize len)
 
         object = json_loadb (data, len, 0, &jerror);
         if (!object) {
-            if (jerror.text)
-                seaf_warning ("Failed to load commit json: %s.\n", jerror.text);
-            else
-                seaf_warning ("Failed to load commit json.\n");
+            seaf_warning ("Failed to load commit json: %s.\n", jerror.text);
             return NULL;
         }
     }
@@ -821,10 +818,7 @@ load_commit (SeafCommitManager *mgr,
 
         object = json_loadb (data, len, 0, &jerror);
         if (!object) {
-            if (jerror.text)
-                seaf_warning ("Failed to load commit json object: %s.\n", jerror.text);
-            else
-                seaf_warning ("Failed to load commit json object.\n");
+            seaf_warning ("Failed to load commit json object: %s.\n", jerror.text);
             goto out;
         }
     }
diff --git a/common/fs-mgr.c b/common/fs-mgr.c
index 8a72c93d2..777dd265e 100644
--- a/common/fs-mgr.c
+++ b/common/fs-mgr.c
@@ -1042,10 +1042,7 @@ seafile_from_json (const char *id, void *data, int len)
     object = json_loadb ((const char *)decompressed, outlen, 0, &error);
     g_free (decompressed);
     if (!object) {
-        if (error.text)
-            seaf_warning ("Failed to load seafile json object: %s.\n", error.text);
-        else
-            seaf_warning ("Failed to load seafile json object.\n");
+        seaf_warning ("Failed to load seafile json object: %s.\n", error.text);
         return NULL;
     }
 
@@ -1515,10 +1512,7 @@ seaf_dir_from_json (const char *dir_id, uint8_t *data, int len)
     object = json_loadb ((const char *)decompressed, outlen, 0, &error);
     g_free (decompressed);
     if (!object) {
-        if (error.text)
-            seaf_warning ("Failed to load seafdir json object: %s.\n", error.text);
-        else
-            seaf_warning ("Failed to load seafdir json object.\n");
+        seaf_warning ("Failed to load seafdir json object: %s.\n", error.text);
         return NULL;
     }
 
@@ -1807,10 +1801,7 @@ parse_metadata_type_json (const char *obj_id, uint8_t *data, int len)
     object = json_loadb ((const char *)decompressed, outlen, 0, &error);
     g_free (decompressed);
     if (!object) {
-        if (error.text)
-            seaf_warning ("Failed to load fs json object: %s.\n", error.text);
-        else
-            seaf_warning ("Failed to load fs json object.\n");
+        seaf_warning ("Failed to load fs json object: %s.\n", error.text);
         return SEAF_METADATA_TYPE_INVALID;
     }
 
@@ -1863,10 +1854,7 @@ fs_object_from_json (const char *obj_id, uint8_t *data, int len)
     object = json_loadb ((const char *)decompressed, outlen, 0, &error);
     g_free (decompressed);
     if (!object) {
-        if (error.text)
-            seaf_warning ("Failed to load fs json object: %s.\n", error.text);
-        else
-            seaf_warning ("Failed to load fs json object.\n");
+        seaf_warning ("Failed to load fs json object: %s.\n", error.text);
         return NULL;
     }
 
diff --git a/common/index/index.c b/common/index/index.c
index f4d9d7a44..31f338442 100644
--- a/common/index/index.c
+++ b/common/index/index.c
@@ -98,20 +98,6 @@ static int verify_hdr(struct cache_header *hdr, unsigned long size)
     return 0;
 }
 
-static inline size_t estimate_cache_size(size_t ondisk_size, unsigned int entries)
-{
-    long per_entry;
-
-    per_entry = sizeof(struct cache_entry) - sizeof(struct ondisk_cache_entry);
-
-    /*
-     * Alignment can cause differences. This should be "alignof", but
-     * since that's a gcc'ism, just use the size of a pointer.
-     */
-    per_entry += sizeof(void *);
-    return ondisk_size + entries*per_entry;
-}
-
 static int convert_from_disk(struct ondisk_cache_entry *ondisk, struct cache_entry **ce)
 {
     size_t len;
@@ -478,20 +464,6 @@ void mark_all_ce_unused(struct index_state *index)
 }
 
 
-static int is_empty_blob_sha1(const unsigned char *sha1)
-{
-    /* static const unsigned char empty_blob_sha1[20] = { */
-    /*     0xe6,0x9d,0xe2,0x9b,0xb2,0xd1,0xd6,0x43,0x4b,0x8b, */
-    /*     0x29,0xae,0x77,0x5a,0xd8,0xc2,0xe4,0x8c,0x53,0x91 */
-    /* }; */
-
-    static const unsigned char empty_blob_sha1[20] = {
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0
-    };
-    return !hashcmp(sha1, empty_blob_sha1);
-}
-
 static int ce_match_stat_basic(struct cache_entry *ce, SeafStat *st)
 {
     unsigned int changed = 0;
@@ -1949,38 +1921,6 @@ static void ce_smudge_racily_clean_entry(struct cache_entry *ce)
 }
 #endif
 
-static int ce_write_entry(WriteIndexInfo *info, int fd, struct cache_entry *ce)
-{
-    int size = ondisk_ce_size(ce);
-    struct ondisk_cache_entry *ondisk = calloc(1, size);
-    char *name;
-    int result;
-
-    ondisk->ctime.sec = htonl((unsigned int)ce->ce_ctime.sec);
-    ondisk->mtime.sec = htonl((unsigned int)ce->ce_mtime.sec);
-    ondisk->dev  = htonl(ce->ce_dev);
-    ondisk->ino  = htonl(ce->ce_ino);
-    ondisk->mode = htonl(ce->ce_mode);
-    ondisk->uid  = htonl(ce->ce_uid);
-    ondisk->gid  = htonl(ce->ce_gid);
-    ondisk->size = hton64(ce->ce_size);
-    hashcpy(ondisk->sha1, ce->sha1);
-    ondisk->flags = htons(ce->ce_flags);
-    /* if (ce->ce_flags & CE_EXTENDED) { */
-    /*     struct ondisk_cache_entry_extended *ondisk2; */
-    /*     ondisk2 = (struct ondisk_cache_entry_extended *)ondisk; */
-    /*     ondisk2->flags2 = htons((ce->ce_flags & CE_EXTENDED_FLAGS) >> 16); */
-    /*     name = ondisk2->name; */
-    /* } */
-    /* else */
-    name = ondisk->name;
-    memcpy(name, ce->name, ce_namelen(ce));
-
-    result = ce_write(info, fd, ondisk, size);
-    free(ondisk);
-    return result;
-}
-
 static int ce_write_entry2(WriteIndexInfo *info, int fd, struct cache_entry *ce)
 {
     int size = ondisk_ce_size2(ce);
diff --git a/daemon/clone-mgr.c b/daemon/clone-mgr.c
index aaca3c7e9..7d8497f55 100644
--- a/daemon/clone-mgr.c
+++ b/daemon/clone-mgr.c
@@ -554,11 +554,7 @@ load_more_info_cb (sqlite3_stmt *stmt, void *data)
     more_info = (const char *)sqlite3_column_text (stmt, 0);
     object = json_loads (more_info, 0, &jerror);
     if (!object) {
-        if (jerror.text)
-            seaf_warning ("Failed to load more sync info from json: %s.\n", jerror.text);
-        else
-            seaf_warning ("Failed to load more sync info from json.\n");
-
+        seaf_warning ("Failed to load more sync info from json: %s.\n", jerror.text);
         return FALSE;
     }
         
@@ -1323,11 +1319,7 @@ add_task_common (SeafCloneManager *mgr,
 
         object = json_loads (more_info, 0, &jerror);
         if (!object) {
-            if (jerror.text)
-                seaf_warning ("Failed to load more sync info from json: %s.\n", jerror.text);
-            else
-                seaf_warning ("Failed to load more sync info from json.\n");
-
+            seaf_warning ("Failed to load more sync info from json: %s.\n", jerror.text);
             clone_task_free (task);
             return NULL;
         }
diff --git a/daemon/merge-recursive.c b/daemon/merge-recursive.c
index 44263fc69..caf082433 100644
--- a/daemon/merge-recursive.c
+++ b/daemon/merge-recursive.c
@@ -381,38 +381,6 @@ static int remove_file(struct merge_options *o, int clean,
     return 0;
 }
 
-inline static int file_exists(const char *f)
-{
-    SeafStat sb;
-    return (seaf_stat (f, &sb) == 0);
-}
-
-#if 0
-static int would_lose_untracked(struct index_state *index, const char *path, const char *real_path)
-{
-    int pos = index_name_pos(index, path, strlen(path));
-
-    if (pos < 0)
-        pos = -1 - pos;
-    while (pos < index->cache_nr &&
-           !strcmp(path, index->cache[pos]->name)) {
-        /*
-         * If stage #0, it is definitely tracked.
-         * If it has stage #2 then it was tracked
-         * before this merge started.  All other
-         * cases the path was not tracked.
-         */
-        switch (ce_stage(index->cache[pos])) {
-        case 0:
-        case 2:
-            return 0;
-        }
-        pos++;
-    }
-    return file_exists(real_path);
-}
-#endif
-
 static int create_leading_directories(int base_len,
                                       const char *path, char **new_path,
                                       const char *conflict_suffix,
diff --git a/daemon/processors/sendfs-v2-proc.c b/daemon/processors/sendfs-v2-proc.c
index 8228df1f6..3a8aa1d46 100644
--- a/daemon/processors/sendfs-v2-proc.c
+++ b/daemon/processors/sendfs-v2-proc.c
@@ -200,6 +200,7 @@ calculate_send_object_list (void *vdata)
     TransferTask *task = proc->tx_task;
 
     SeafBranch *local = NULL, *master = NULL;
+    SeafCommit *local_head = NULL, *master_head = NULL;
     local = seaf_branch_manager_get_branch (seaf->branch_mgr, task->repo_id, "local");
     if (!local) {
         seaf_warning ("Branch local not found for repo %.8s.\n", task->repo_id);
@@ -213,7 +214,6 @@ calculate_send_object_list (void *vdata)
         goto out;
     }
 
-    SeafCommit *local_head = NULL, *master_head = NULL;
     local_head = seaf_commit_manager_get_commit (seaf->commit_mgr,
                                                  task->repo_id, task->repo_version,
                                                  local->commit_id);
diff --git a/daemon/repo-mgr.c b/daemon/repo-mgr.c
index dc6a7b700..3a9817864 100644
--- a/daemon/repo-mgr.c
+++ b/daemon/repo-mgr.c
@@ -1084,6 +1084,7 @@ seaf_repo_manager_is_ignored_hidden_file (const char *filename)
     return FALSE;
 }
 
+#ifdef WIN32
 static inline gboolean
 has_trailing_space_or_period (const char *path)
 {
@@ -1094,6 +1095,7 @@ has_trailing_space_or_period (const char *path)
 
     return FALSE;
 }
+#endif
 
 typedef enum IgnoreReason {
     IGNORE_REASON_END_SPACE_PERIOD = 0,
@@ -2139,8 +2141,6 @@ add_path_to_index (SeafRepo *repo, struct index_state *istate,
                    GList **scanned_dirs, gint64 *total_size, GQueue **remain_files,
                    LockedFileSet *fset)
 {
-    SeafStat st;
-
     /* If we've recursively scanned the parent directory, don't need to scan
      * any files under it any more.
      */
@@ -4167,13 +4167,6 @@ print_index (struct index_state *istate)
 }
 #endif
 
-static inline void
-print_time (const char *desc, GTimeVal *s, GTimeVal *e)
-{
-    seaf_message ("%s: %lu\n", desc,
-                  (e->tv_sec*G_USEC_PER_SEC+e->tv_usec - (s->tv_sec*G_USEC_PER_SEC+s->tv_usec))/1000);
-}
-
 char *
 seaf_repo_index_commit (SeafRepo *repo, const char *desc,
                         gboolean is_force_commit,
@@ -7485,18 +7478,6 @@ save_repo_property (SeafRepoManager *manager,
     pthread_mutex_unlock (&manager->priv->db_lock);
 }
 
-inline static gboolean is_peer_relay (const char *peer_id)
-{
-    CcnetPeer *peer = ccnet_get_peer(seaf->ccnetrpc_client, peer_id);
-
-    if (!peer)
-        return FALSE;
-
-    gboolean is_relay = string_list_is_exists(peer->role_list, "MyRelay");
-    g_object_unref (peer);
-    return is_relay;
-}
-
 int
 seaf_repo_manager_set_repo_relay_id (SeafRepoManager *mgr,
                                      SeafRepo *repo,
diff --git a/daemon/sync-mgr.c b/daemon/sync-mgr.c
index ce1e4087e..ffd500db4 100644
--- a/daemon/sync-mgr.c
+++ b/daemon/sync-mgr.c
@@ -3331,8 +3331,10 @@ seaf_sync_manager_get_path_sync_status (SeafSyncManager *mgr,
 
     /* If the repo is in error, all files in it should show no sync status. */
     sync_info = get_sync_info (mgr, repo_id);
-    if (sync_info && sync_info->in_error)
-        return SYNC_STATUS_NONE;
+    if (sync_info && sync_info->in_error) {
+        ret = SYNC_STATUS_NONE;
+        goto out;
+    }
 
     pthread_mutex_lock (&mgr->priv->paths_lock);
 
diff --git a/daemon/transfer-mgr.c b/daemon/transfer-mgr.c
index 60069de53..cc49fd554 100644
--- a/daemon/transfer-mgr.c
+++ b/daemon/transfer-mgr.c
@@ -406,18 +406,6 @@ transfer_task_with_proc_failure (TransferTask *task,
     }
 }
 
-inline static gboolean is_peer_relay (const char *peer_id)
-{
-    CcnetPeer *peer = ccnet_get_peer(seaf->ccnetrpc_client, peer_id);
-
-    if (!peer)
-        return FALSE;
-
-    gboolean is_relay = string_list_is_exists(peer->role_list, "MyRelay");
-    g_object_unref (peer);
-    return is_relay;
-}
-
 /*
  * Transfer Manager.
  */
diff --git a/daemon/wt-monitor-macos.c b/daemon/wt-monitor-macos.c
index c5e4d7851..195e696f0 100644
--- a/daemon/wt-monitor-macos.c
+++ b/daemon/wt-monitor-macos.c
@@ -236,11 +236,9 @@ stream_callback (ConstFSEventStreamRef streamRef,
                       const FSEventStreamEventId eventIds[])
 {
     RepoWatchInfo *info;
-    char *repo_id;
     SeafWTMonitor *monitor = (SeafWTMonitor *)clientCallBackInfo;
     SeafWTMonitorPriv *priv = monitor->priv;
     char **paths = (char **)eventPaths;
-    char *dir;
 
     info = g_hash_table_lookup (priv->info_hash, (gpointer)(long)streamRef);
     if (!info) {