From: Eric Long <i@hack3r.moe>
Date: Fri, 9 Aug 2024 16:42:34 +0000 (+0800)
Subject: bpftool: add host build
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=21b155e0ff457131515ef7ee525d734b547fb0ba;p=openwrt%2Fstaging%2Fblocktrron.git

bpftool: add host build

Besides probing BPF information in running system, bpftool is also used in
generating skeleton, dumping BTF, etc. that is widely used in modern BPF
development. Make it available as a host tool so that we can use it in
package build.

Tested build targeting malta/le on Arch Linux x86_64. bpftools currently
does not support processing cross-endian BPF objects, so big-endian host
is needed to build for big-endian targets using bpftools.

Signed-off-by: Eric Long <i@hack3r.moe>
Link: https://github.com/openwrt/openwrt/pull/16122
Signed-off-by: Robert Marko <robimarko@gmail.com>
---

diff --git a/package/network/utils/bpftool/Makefile b/package/network/utils/bpftool/Makefile
index 45f8904d8d..f2726d1896 100644
--- a/package/network/utils/bpftool/Makefile
+++ b/package/network/utils/bpftool/Makefile
@@ -22,8 +22,11 @@ PKG_BUILD_FLAGS:=no-mips16 gc-sections lto
 PKG_BUILD_PARALLEL:=1
 PKG_INSTALL:=1
 
+HOST_BUILD_PARALLEL:=1
+
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/nls.mk
+include $(INCLUDE_DIR)/host-build.mk
 
 define Package/bpftool/Default
   SECTION:=net
@@ -88,5 +91,30 @@ define Package/bpftool-$(BUILD_VARIANT)/install
 		$(1)/usr/libexec/bpftool-$(BUILD_VARIANT)
 endef
 
+HOST_MAKE_FLAGS += \
+	OUTPUT="$(HOST_BUILD_DIR)/" \
+	prefix="/usr" \
+	$(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='') \
+	check_feat=0 \
+	feature-clang-bpf-co-re=0 \
+	feature-libbfd=1 \
+	feature-llvm=0 \
+	feature-libcap=0 \
+	feature-disassembler-four-args=1 \
+	feature-disassembler-init-styled=1
+
+HOST_MAKE_PATH = src
+
+define Host/Install
+	$(INSTALL_DIR) $(STAGING_DIR_HOST)/usr/sbin
+	$(INSTALL_BIN) $(HOST_BUILD_DIR)/bpftool \
+		$(STAGING_DIR_HOST)/usr/sbin/bpftool
+endef
+
+define Host/Clean
+	rm -f $(STAGING_DIR_HOST)/usr/sbin/bpftool
+endef
+
 $(eval $(call BuildPackage,bpftool-full))
 $(eval $(call BuildPackage,bpftool-minimal))
+$(eval $(call HostBuild))