hi，
this patch may be have some problem。
bitbake bpftool：
chy@ubuntu:/home/sam/work/qemu-buildsystem/buildsystem3.0/build/qemuarm64/tmp/work-shared/qemuarm64/kernel-source/tools/bpf/bpftool$
make -C
/home/sam/work/qemu-buildsystem/buildsystem3.0/buildsystem/source/kernel/linux-6.1.83/tools/lib/bpf
OUTPUT=/home/sam/work/qemu-buildsystem/buildsystem3.0/build/qemuarm64/tmp/work/qemuarm64-poky-linux/bpftool/1.0-r0/bpftool-1.0/bootstrap/libbpf/
DESTDIR=/home/sam/work/qemu-buildsystem/buildsystem3.0/build/qemuarm64/tmp/work/qemuarm64-poky-linux/bpftool/1.0-r0/bpftool-1.0/bootstrap/libbpf
prefix= ARCH= CROSS_COMPILE= CC=gcc
-isystem/home/sam/work/qemu-buildsystem/buildsystem3.0/build/qemuarm64/tmp/work/qemuarm64-poky-linux/bpftool/1.0-r0/recipe-sysroot-native/usr/include
-O2 -pipe LD=ld AR=ar
/home/sam/work/qemu-buildsystem/buildsystem3.0/build/qemuarm64/tmp/work/qemuarm64-poky-linux/bpftool/1.0-r0/bpftool-1.0/bootstrap/libbpf/libbpf.a
install_headers
make: invalid option -- 'y'
make: invalid option -- '/'
i guss that：
HOSTCC="${BUILD_CC} ${BUILD_CFLAGS}"
should be this：
HOSTCC="${BUILD_CC}
because， HOSTCC is used in ：
$(LIBBPF_BOOTSTRAP): $(wildcard $(BPF_DIR)/*.[ch] $(BPF_DIR)/Makefile) |
$(LIBBPF_BOOTSTRAP_OUTPUT)
echo chy____________1___$(BPF_DIR) _______________________
$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_BOOTSTRAP_OUTPUT) \
DESTDIR=$(LIBBPF_BOOTSTRAP_DESTDIR:/=) prefix= \
ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) $@ install_headers
echo chy____________2__________________________
if HOSTCC= ${BUILD_CC} and ${BUILD_CFLAGS}
it will be err in step make -C ：
make -C
/home/sam/work/qemu-buildsystem/buildsystem3.0/buildsystem/source/kernel/linux-6.1.83/tools/lib/bpf
OUTPUT=/home/sam/work/qemu-buildsystem/buildsystem3.0/build/qemuarm64/tmp/work/qemuarm64-poky-linux/bpftool/1.0-r0/bpftool-1.0/bootstrap/libbpf/
DESTDIR=/home/sam/work/qemu-buildsystem/buildsystem3.0/build/qemuarm64/tmp/work/qemuarm64-poky-linux/bpftool/1.0-r0/bpftool-1.0/bootstrap/libbpf
prefix= ARCH= CROSS_COMPILE= *CC=gcc*
*-isystem/home/sam/work/qemu-buildsystem/buildsystem3.0/build/qemuarm64/tmp/work/qemuarm64-poky-linux/bpftool/1.0-r0/recipe-sysroot-native/usr/include
-O2 -pipe* LD=ld AR=ar
/home/sam/work/qemu-buildsystem/buildsystem3.0/build/qemuarm64/tmp/work/qemuarm64-poky-linux/bpftool/1.0-r0/bpftool-1.0/bootstrap/libbpf/libbpf.a
install_headers
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