package/luajit: add option to enable Lua 5.2 compatibility

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
[Thomas: formatting tweaks.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/luajit/Config.in

@@ -36,6 +36,11 @@ config BR2_PACKAGE_PROVIDES_LUAINTERPRETER
 config BR2_PACKAGE_LUAINTERPRETER_ABI_VERSION
 	default "5.1"
 
+config BR2_PACKAGE_LUAJIT_COMPAT52
+	bool "Lua 5.2 compatibility"
+	help
+	  Compile with Lua 5.2 compatibility.
+
 endif
 
 comment "luajit needs a toolchain w/ dynamic library"

package/luajit/luajit.mk

@@ -14,6 +14,10 @@ LUAJIT_INSTALL_STAGING = YES
 
 LUAJIT_PROVIDES = luainterpreter
 
+ifeq ($(BR2_PACKAGE_LUAJIT_COMPAT52),y)
+LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_LUA52COMPAT
+endif
+
 ifeq ($(BR2_STATIC_LIBS),y)
 LUAJIT_BUILDMODE = static
 else
@@ -48,6 +52,7 @@ define LUAJIT_BUILD_CMDS
 		HOST_CFLAGS="$(HOST_CFLAGS)" \
 		HOST_LDFLAGS="$(HOST_LDFLAGS)" \
 		BUILDMODE=$(LUAJIT_BUILDMODE) \
+		XCFLAGS=$(LUAJIT_XCFLAGS) \
 		-C $(@D) amalg
 endef
 
@@ -68,6 +73,7 @@ LUAJIT_POST_INSTALL_TARGET_HOOKS += LUAJIT_INSTALL_SYMLINK
 define HOST_LUAJIT_BUILD_CMDS
 	$(HOST_MAKE_ENV) $(MAKE) PREFIX="$(HOST_DIR)" BUILDMODE=dynamic \
 		TARGET_LDFLAGS="$(HOST_LDFLAGS)" \
+		XCFLAGS=$(LUAJIT_XCFLAGS) \
 		-C $(@D) amalg
 endef