sqlite3: add option for batch-atomic write support

This allows to build SQLite with support for the batch-atomic write
optimization. It makes use of atomic write support provided by the
underlying file system. Currently, this is only supported on F2FS. It
it does not work with overlayfs.

Signed-off-by: Jan Hoffmann <jan@3e8.eu>

libs/sqlite3/Config-lib.in

@@ -1,6 +1,12 @@
 menu "Configuration"
 	depends on PACKAGE_libsqlite3
 
+config SQLITE3_BATCH_ATOMIC_WRITE
+	bool "Batch-atomic write support"
+	default n
+	help
+	  Enable batch-atomic write optimization (supported only on F2FS).
+
 config SQLITE3_DYNAMIC_EXTENSIONS
 	bool "Dynamic extensions"
 	default y

libs/sqlite3/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=sqlite
 PKG_VERSION:=3330000
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-autoconf-$(PKG_VERSION).tar.gz
 PKG_HASH:=106a2c48c7f75a298a7557bcc0d5f4f454e5b43811cc738b7ca294d6956bbb15
@@ -31,6 +31,7 @@ PKG_FIXUP:=autoreconf
 PKG_INSTALL:=1
 
 PKG_CONFIG_DEPENDS := \
+	CONFIG_SQLITE3_BATCH_ATOMIC_WRITE \
 	CONFIG_SQLITE3_DYNAMIC_EXTENSIONS \
 	CONFIG_SQLITE3_FTS3 \
 	CONFIG_SQLITE3_FTS4 \
@@ -99,7 +100,8 @@ endef
 TARGET_CFLAGS += \
 	-DHAVE_ISNAN \
 	-DHAVE_MALLOC_USABLE_SIZE \
-	-DSQLITE_ENABLE_UNLOCK_NOTIFY
+	-DSQLITE_ENABLE_UNLOCK_NOTIFY \
+	$(if $(CONFIG_SQLITE3_BATCH_ATOMIC_WRITE),-DSQLITE_ENABLE_BATCH_ATOMIC_WRITE)
 
 CONFIGURE_ARGS += \
 	--disable-debug \