dist/tools: add support for flatc compiler

dist/tools/flatc/.gitignore

@@ -0,0 +1,2 @@
+flatc
+bin

dist/tools/flatc/Makefile

@@ -0,0 +1,28 @@
+PKG_NAME=flatc
+PKG_URL=https://github.com/google/flatbuffers
+PKG_VERSION=9e7e8cbe9f675123dd41b7c62868acad39188cae
+PKG_LICENSE=Apache2.0
+
+PKG_BUILDDIR=$(CURDIR)/bin
+
+# manually set some RIOT env vars, so this Makefile can be called stand-alone
+RIOTBASE ?= $(CURDIR)/../../..
+RIOTTOOLS ?= $(CURDIR)/..
+GITCACHE ?= $(RIOTTOOLS)/git/git-cache
+
+CMAKE_OPTIONS = \
+    -DCMAKE_BUILD_TYPE=Release       \
+    -DFLATBUFFERS_BUILD_TESTS=OFF    \
+    -DFLATBUFFERS_BUILD_FLATHASH=OFF \
+    -DFLATBUFFERS_BUILD_FLATLIB=OFF  \
+    #
+
+include $(RIOTBASE)/pkg/pkg.mk
+
+all:
+	@cd "$(PKG_BUILDDIR)" && env -i PATH="$(PATH)" cmake -G "Unix Makefiles" $(CMAKE_OPTIONS) .
+	"$(MAKE)" -C "$(PKG_BUILDDIR)"
+	@mv "$(PKG_BUILDDIR)"/flatc $(CURDIR)/flatc
+
+distclean::
+	@rm -f $(CURDIR)/flatc

makefiles/tools/targets.inc.mk

@@ -34,3 +34,8 @@ $(RIOTTOOLS)/setsid/setsid: $(RIOTTOOLS)/setsid/Makefile
 	@echo "[INFO] setsid binary not found - building it from source now"
 	@make -C $(RIOTTOOLS)/setsid
 	@echo "[INFO] setsid binary successfully built!"
+
+$(RIOTTOOLS)/flatc/flatc: $(RIOTTOOLS)/flatc/Makefile
+	@echo "[INFO] flatc binary not found - building it from source now"
+	make -C $(RIOTTOOLS)/flatc
+	@echo "[INFO] flatc binary successfully built!"