pkg: add support for Elk tiny JS engine

pkg/Kconfig

@@ -14,6 +14,7 @@ rsource "cn-cbor/Kconfig"
 rsource "driver_atwinc15x0/Kconfig"
 rsource "driver_bme680/Kconfig"
 rsource "driver_sx126x/Kconfig"
+rsource "elk/Kconfig"
 rsource "emlearn/Kconfig"
 rsource "fff/Kconfig"
 rsource "gemmlowp/Kconfig"

pkg/elk/Kconfig

@@ -0,0 +1,11 @@
+# Copyright (c) 2021 Inria
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+config PACKAGE_ELK
+    bool "Elk: a tiny Javascript engine"
+    select MODULE_PRINTF_FLOAT
+    depends on !HAS_ARCH_AVR8
+    depends on TEST_KCONFIG

pkg/elk/Makefile

@@ -0,0 +1,13 @@
+PKG_NAME=elk
+PKG_URL=https://github.com/cesanta/elk
+PKG_VERSION=1eab37bd9041d93a0bdfcd4335b2dcdba1076c67  # 2.1.0
+PKG_LICENSE=GPLv2
+
+include $(RIOTBASE)/pkg/pkg.mk
+
+CFLAGS += -Wno-format-nonliteral
+CFLAGS += -Wno-pedantic
+CFLAGS += -Wno-unused-parameter
+
+all:
+	$(QQ)"$(MAKE)" -C $(PKG_SOURCE_DIR) -f $(CURDIR)/$(PKG_NAME).mk

pkg/elk/Makefile.dep

@@ -0,0 +1,5 @@
+# For numeric values, Elk uses float string formatting...
+USEMODULE += printf_float
+
+# Blacklist AVR8 since printing float is not well supported on these platforms
+FEATURES_BLACKLIST += arch_avr8

pkg/elk/Makefile.include

@@ -0,0 +1 @@
+INCLUDES += -I$(PKGDIRBASE)/elk

pkg/elk/doc.txt

@@ -0,0 +1,11 @@
+/**
+ * @defgroup pkg_elk   Elk: a tiny Javascript engine
+ * @ingroup  pkg
+ * @brief    Elk is a tiny embeddable JavaScript engine that implements a small but usable subset of ES6
+ *
+ * # License
+ *
+ * Licensed under GPLv2 + Commercial
+ *
+ * @see      https://github.com/cesanta/elk
+ */

pkg/elk/elk.mk

@@ -0,0 +1,3 @@
+MODULE = elk
+
+include $(RIOTBASE)/Makefile.base