tools/llvm-bpf: move tarball packing to target/llvm-bpf

This ensures that the tarball is regenerated after make clean or after switching
to a different target

Signed-off-by: Felix Fietkau <nbd@nbd.name>

target/Makefile

@@ -7,9 +7,14 @@
 curdir:=target
 
 $(curdir)/subtargets:=install
-$(curdir)/builddirs:=linux sdk imagebuilder toolchain
+$(curdir)/builddirs:=linux sdk imagebuilder toolchain llvm-bpf
 $(curdir)/builddirs-default:=linux
-$(curdir)/builddirs-install:=linux $(if $(CONFIG_SDK),sdk) $(if $(CONFIG_IB),imagebuilder) $(if $(CONFIG_MAKE_TOOLCHAIN),toolchain)
+$(curdir)/builddirs-install:=\
+	linux \
+	$(if $(CONFIG_SDK),sdk) \
+	$(if $(CONFIG_IB),imagebuilder) \
+	$(if $(CONFIG_MAKE_TOOLCHAIN),toolchain) \
+	$(if $(CONFIG_SDK_LLVM_BPF),llvm-bpf)
 
 $(curdir)/sdk/install:=$(curdir)/linux/install
 $(curdir)/imagebuilder/install:=$(curdir)/linux/install

target/llvm-bpf/Makefile

@@ -0,0 +1,29 @@
+#
+# Copyright (C) 2021 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+override MAKEFLAGS=
+
+LLVM_VERSION := $(shell cat $(STAGING_DIR_HOST)/llvm-bpf/.llvm-version)
+
+LLVM_BPF_PREFIX := llvm-bpf-$(LLVM_VERSION).$(HOST_OS)-$(HOST_ARCH)
+LLVM_TAR := $(BIN_DIR)/$(LLVM_BPF_PREFIX).tar.xz
+
+$(LLVM_TAR): $(HOST_STAMP_INSTALLED)
+	tar -C $(STAGING_DIR_HOST) \
+		-I '$(STAGING_DIR_HOST)/bin/xz -7e -T$(if $(filter 1,$(NPROC)),2,0)' \
+		-cf $@.tmp llvm-bpf $(LLVM_BPF_PREFIX)
+	mv $@.tmp $@
+
+download:
+prepare:
+compile: $(LLVM_TAR)
+install: compile
+
+clean:
+	rm -f $(LLVM_TAR)