[openwrt/openwrt] build: fix bpf toolchain dependency for qosify

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/6738820bf637fd705ea7e61acf4f694e1bcda313

commit 6738820bf637fd705ea7e61acf4f694e1bcda313
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Nov 1 18:40:03 2021 +0100

    build: fix bpf toolchain dependency for qosify
    
    Add hidden symbols to fix defaults with CONFIG_DEVEL unset
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 include/bpf.mk                         |  2 ++
 package/network/config/qosify/Makefile |  2 +-
 toolchain/Config.in                    | 13 +++++++++++++
 tools/Makefile                         |  2 +-
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/include/bpf.mk b/include/bpf.mk
index 3dc65c7685..5211ec4434 100644
--- a/include/bpf.mk
+++ b/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),)
diff --git a/package/network/config/qosify/Makefile b/package/network/config/qosify/Makefile
index 28dedf874d..a7532d2906 100644
--- a/package/network/config/qosify/Makefile
+++ b/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
diff --git a/toolchain/Config.in b/toolchain/Config.in
index 1515135806..b8b4cfeb88 100644
--- a/toolchain/Config.in
+++ b/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
diff --git a/tools/Makefile b/tools/Makefile
index f070692942..ad8eeb31a4 100644
--- a/tools/Makefile
+++ b/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