pkg: initial import of lwIP package

Makefile.dep

@@ -354,6 +354,11 @@ ifneq (,$(filter posix_semaphore,$(USEMODULE)))
   USEMODULE += xtimer
 endif
 
+ifneq (,$(filter lwip,$(USEMODULE)))
+  USEPKG += lwip
+  USEMODULE += lwip_core
+endif
+
 ifneq (,$(filter sema,$(USEMODULE)))
   USEMODULE += xtimer
 endif

pkg/lwip/Makefile

+PKG_NAME=lwip
+PKG_URL=git://git.savannah.nongnu.org/lwip.git
+PKG_VERSION=fd4a109ffa6513b28a0c780a952cef1110423717
+PKG_BUILDDIR ?= $(BINDIRBASE)/pkg/$(BOARD)/$(PKG_NAME)
+
+.PHONY: all
+
+all: git-download
+	$(MAKE) -C $(PKG_BUILDDIR)
+
+include $(RIOTBASE)/pkg/pkg.mk

pkg/lwip/Makefile.include

+INCLUDES += -I$(RIOTBASE)/pkg/lwip/include \
+            -I$(BINDIRBASE)/pkg/$(BOARD)/lwip/src/include

pkg/lwip/doc.txt

+/**
+ * @defgroup pkg_lwip   lwIP network stack
+ * @ingroup pkg
+ * @brief   Provides the lwIP network stack
+ * @see     http://savannah.nongnu.org/projects/lwip/
+ */