sqlite: add option to disable fsync

For use-cases in which performance is more important than data integrity.

Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/sqlite/Config.in

@@ -53,4 +53,13 @@ config BR2_PACKAGE_SQLITE_SECURE_DELETE
 	  http://www.sqlite.org/pragma.html#pragma_secure_delete
 	  for additional information.
 
+config BR2_PACKAGE_SQLITE_NO_SYNC
+	bool "Disable fsync"
+	help
+	  By default SQLite forces all database transactions to storage
+	  immediately using fsync() to protect against data loss in case
+	  of power failure.
+	  This option turns this behavior off resulting in higher performance
+	  especially when using slow flash storage.
+
 endif

package/sqlite/sqlite.mk

@@ -33,6 +33,10 @@ ifeq ($(BR2_PACKAGE_SQLITE_SECURE_DELETE),y)
 SQLITE_CFLAGS += -DSQLITE_SECURE_DELETE
 endif
 
+ifeq ($(BR2_PACKAGE_SQLITE_NO_SYNC),y)
+SQLITE_CFLAGS += -DSQLITE_NO_SYNC
+endif
+
 SQLITE_CONF_ENV = CFLAGS="$(TARGET_CFLAGS) $(SQLITE_CFLAGS)"
 
 SQLITE_CONF_OPT = \