external: Add clang

Author: mpe

external/clang/.gitignore

@@ -0,0 +1,2 @@
+clang.tar.xz
+install

external/clang/Makefile

@@ -0,0 +1,30 @@
+help:
+	@echo "clang"
+	@echo "Available targets:"
+	@echo "  download       # download and unpack clang"
+	@echo ""
+
+VERSION := 14.0.0
+
+clang.tar.xz:
+	wget --no-verbose -O $@.tmp https://github.com/llvm/llvm-project/releases/download/llvmorg-$(VERSION)/clang+llvm-$(VERSION)-powerpc64le-linux-rhel-7.9.tar.xz
+	mv $@.tmp $@
+
+install/bin/clang: clang.tar.xz
+	rm -rf install
+	tar -xf clang.tar.xz
+	mv clang+llvm-* install
+
+download: install/bin/clang
+
+prepare: download
+
+build:
+
+clean:
+	@:
+
+distclean: clean
+	rm -rf install clang.tar.xz
+
+.PHONY: download prepare build clean distclean help