autobuild_mac80211_release/0010-add-llvm_bpf-toolchain.patch

diff --git a/target/Makefile b/target/Makefile
index 7ad26c71..83f9c4b0 100644
--- a/target/Makefile
+++ b/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
diff --git a/toolchain/Config.in b/toolchain/Config.in
index 6dda9af9..221e25f2 100644
--- a/toolchain/Config.in
+++ b/toolchain/Config.in
@@ -37,6 +37,39 @@ menuconfig TARGET_OPTIONS
 
 		  Most people will answer N.
 
+	choice BPF_TOOLCHAIN
+		prompt "BPF toolchain" if DEVEL
+		default BPF_TOOLCHAIN_BUILD_LLVM if BUILDBOT
+		default BPF_TOOLCHAIN_PREBUILT if HAS_PREBUILT_LLVM_TOOLCHAIN
+		default BPF_TOOLCHAIN_NONE
+
+		config BPF_TOOLCHAIN_NONE
+			bool "None"
+
+		config BPF_TOOLCHAIN_PREBUILT
+			bool "Use prebuilt LLVM toolchain"
+			depends on HAS_PREBUILT_LLVM_TOOLCHAIN
+			select USE_LLVM_PREBUILT
+
+		config BPF_TOOLCHAIN_HOST
+			select USE_LLVM_HOST
+			bool "Use host LLVM toolchain"
+
+		config BPF_TOOLCHAIN_BUILD_LLVM
+			select USE_LLVM_BUILD
+			bool "Build LLVM toolchain for eBPF"
+			help
+			  If enabled, a LLVM toolchain for building eBPF binaries will be built.
+			  If this is not enabled, eBPF packages can only be built if the host
+			  has a suitable toolchain
+	endchoice
+
+	config BPF_TOOLCHAIN_HOST_PATH
+		string
+		depends on BPF_TOOLCHAIN_HOST
+		prompt "Host LLVM toolchain path (prefix)" if DEVEL
+		default "/usr/local/opt/llvm" if HOST_OS_MACOS
+		default ""
 
 menuconfig EXTERNAL_TOOLCHAIN
 	bool
@@ -259,6 +292,26 @@ config GDB
 	help
 	  Enable if you want to build the gdb.
 
+config HAS_BPF_TOOLCHAIN
+	bool
+
+config HAS_PREBUILT_LLVM_TOOLCHAIN
+	def_bool $(shell, [ -f llvm-bpf/.llvm-version ] && echo y || echo n)
+
+config USE_LLVM_HOST
+	select HAS_BPF_TOOLCHAIN
+	bool
+
+config USE_LLVM_PREBUILT
+	select HAS_BPF_TOOLCHAIN
+	default y if !DEVEL && !BUILDBOT && HAS_PREBUILT_LLVM_TOOLCHAIN
+	bool
+
+config USE_LLVM_BUILD
+	default y if !DEVEL && BUILDBOT
+	select HAS_BPF_TOOLCHAIN
+	bool
+
 config USE_GLIBC
 	default y if !TOOLCHAINOPTS && !EXTERNAL_TOOLCHAIN && !NATIVE_TOOLCHAIN && (arc)
 	bool
diff --git a/tools/Makefile b/tools/Makefile
index 29309ec4..84f984dd 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -37,6 +37,7 @@ tools-$(CONFIG_TARGET_mxs) += elftosb sdimage
 tools-$(CONFIG_TARGET_tegra) += cbootimage cbootimage-configs
 tools-$(CONFIG_USES_MINOR) += kernel2minor
 tools-$(CONFIG_USE_SPARSE) += sparse
+tools-$(CONFIG_USE_LLVM_BUILD) += llvm-bpf
 tools-y += openssl
 tools-y += aesgcm
 
@@ -59,6 +60,7 @@ $(curdir)/libelf/compile := $(curdir)/libtool/compile
 $(curdir)/libressl/compile := $(curdir)/pkgconf/compile
 $(curdir)/libtool/compile := $(curdir)/m4/compile $(curdir)/autoconf/compile $(curdir)/automake/compile $(curdir)/missing-macros/compile
 $(curdir)/lzma-old/compile := $(curdir)/zlib/compile
+$(curdir)/llvm-bpf/compile := $(curdir)/cmake/compile
 $(curdir)/make-ext4fs/compile := $(curdir)/zlib/compile
 $(curdir)/missing-macros/compile := $(curdir)/autoconf/compile
 $(curdir)/mkimage/compile += $(curdir)/libressl/compile
diff --git a/tools/llvm-bpf/Makefile b/tools/llvm-bpf/Makefile
index 527b3578..53b7347a 100644
--- a/tools/llvm-bpf/Makefile
+++ b/tools/llvm-bpf/Makefile
@@ -26,7 +26,7 @@ include $(INCLUDE_DIR)/cmake.mk
 
 LLVM_BPF_PREFIX = llvm-bpf-$(PKG_VERSION).$(HOST_OS)-$(HOST_ARCH)
 
-CMAKE_HOST_INSTALL_PREFIX = $(STAGING_DIR_HOST)/$(LLVM_BPF_PREFIX)
+HOST_BUILD_PREFIX = $(STAGING_DIR_HOST)/$(LLVM_BPF_PREFIX)
 
 CMAKE_HOST_OPTIONS += \
 	-DLLVM_ENABLE_BINDINGS=OFF \
@@ -46,7 +46,7 @@ define Host/Install
 	$(Host/Install/Default)
 	ln -s $(LLVM_BPF_PREFIX) $(STAGING_DIR_HOST)/llvm-bpf
 	STRIP_KMOD= PATCHELF= STRIP=strip $(SCRIPT_DIR)/rstrip.sh $(STAGING_DIR_HOST)/llvm-bpf
-	echo "$(PKG_VERSION)" > $(CMAKE_HOST_INSTALL_PREFIX)/.llvm-version
+	echo "$(PKG_VERSION)" > $(HOST_BUILD_PREFIX)/.llvm-version
 endef
 
 define Host/Uninstall