build: fix bpf toolchain dependency for qosify

Add hidden symbols to fix defaults with CONFIG_DEVEL unset

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

include/bpf.mk

@@ -1,3 +1,5 @@
+BPF_DEPENDS := @HAS_BPF_TOOLCHAIN
+
 ifneq ($(CONFIG_BPF_TOOLCHAIN_HOST),)
   BPF_TOOLCHAIN_HOST_PATH:=$(call qstrip,$(CONFIG_BPF_TOOLCHAIN_HOST_PATH))
   ifneq ($(BPF_TOOLCHAIN_HOST_PATH),)

package/network/config/qosify/Makefile

@@ -29,7 +29,7 @@ define Package/qosify
   CATEGORY:=Kernel modules
   SUBMENU:=Network Support
   TITLE:=A simple QoS solution based eBPF + CAKE
-  DEPENDS:=+libbpf +libubox +libubus +kmod-sched-cake +tc-full @!BPF_TOOLCHAIN_NONE
+  DEPENDS:=+libbpf +libubox +libubus +kmod-sched-cake +tc-full $(BPF_DEPENDS)
 endef
 
 define Build/Compile

toolchain/Config.in

@@ -46,9 +46,11 @@ menuconfig TARGET_OPTIONS
 			bool "None"
 
 		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.
@@ -292,6 +294,17 @@ config GDB_PYTHON
 	help
 	  Enable the python bindings for GDB to allow using python in the gdb shell.
 
+config HAS_BPF_TOOLCHAIN
+	bool
+
+config USE_LLVM_HOST
+	select HAS_BPF_TOOLCHAIN
+	bool
+
+config USE_LLVM_BUILD
+	select HAS_BPF_TOOLCHAIN
+	bool
+
 config USE_GLIBC
 	default y if !TOOLCHAINOPTS && !EXTERNAL_TOOLCHAIN && !NATIVE_TOOLCHAIN && (arc)
 	bool

tools/Makefile

@@ -35,7 +35,7 @@ tools-$(CONFIG_TARGET_mxs) += elftosb sdimage
 tools-$(CONFIG_TARGET_tegra) += cbootimage cbootimage-configs
 tools-$(CONFIG_USES_MINOR) += kernel2minor
 tools-$(CONFIG_USE_SPARSE) += sparse
-tools-$(CONFIG_BPF_TOOLCHAIN_BUILD_LLVM) += llvm-bpf
+tools-$(CONFIG_USE_LLVM_BUILD) += llvm-bpf
 
 # builddir dependencies
 $(curdir)/autoconf/compile := $(curdir)/m4/compile