When I did a `git clean` I noticed that `tools/bpf/bpftool/vmlinux`
existed but the failure appeared to look like the file was expected
under `debian/build/tools-perarch/tools/bpf/bpftool/vmlinux`. With this
hacky patch I managed to get the build to complete:
```
diff --git a/debian/rules.d/2-binary-arch.mk b/debian/rules.d/2-binary-arch.mk
index 986a18d7abac9..398e6dc3a3434 100644
--- a/debian/rules.d/2-binary-arch.mk
+++ b/debian/rules.d/2-binary-arch.mk
@@ -666,6 +666,9 @@ ifeq ($(do_tools_perf),true)
$(kmake) prefix=/usr NO_LIBTRACEEVENT=1
HAVE_CPLUS_DEMANGLE_SUPPORT=1 CROSS_COMPILE=$(CROSS_COMPILE) NO_LIBPERL=1
WERROR=0
endif
ifeq ($(do_tools_bpftool),true)
+ if [ -f $(CURDIR)/tools/bpf/bpftool/vmlinux ] && ! [ -f
$(builddirpa)/tools/bpf/bpftool/vmlinux ] ; then \
+ ln $(CURDIR)/tools/bpf/bpftool/vmlinux
$(builddirpa)/tools/bpf/bpftool/vmlinux ; \
+ fi
mv $(builddirpa)/tools/bpf/bpftool/vmlinux $(builddirpa)/vmlinux
$(kmake) NO_LIBTRACEEVENT=1 CROSS_COMPILE=$(CROSS_COMPILE) -C
$(builddirpa)/tools/bpf/bpftool
rm -f $(builddirpa)/vmlinux
```
I don't know if using an alternate output path somehow interacts with
this method to find the vmlinux file, i.u. a file is found in one place
so it is not rebuilt but that place is not the same that 2-binary-
arch.mk expects. Makefiles are not my speciality though so likely I've
just found a working bodge:)
```
VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
$(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
../../../vmlinux \
/sys/kernel/btf/vmlinux )libbpf/ \
/boot/vmlinux-$(shell uname -r)
VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
```
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https://bugs.launchpad.net/bugs/2047683
Title:
Kernel build fails on debian/build/tools-
perarch/tools/bpf/bpftool/vmlinux
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