From: Gregory Bell on gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/3738#note_2400785759
For RPM_VMLINUX_H vmlinux.h is being output here
`tools/bpf/bpftool/bootstrap/bpftool btf dump file vmlinux format c >
$RPM_BUILD_ROOT/$DevelDir/vmlinux.h` previously no build would see it when
checking this condition so RPM_VMLINUX_H was always an empty variable
```
if [ -f $DevelDir/vmlinux.h ]; then
RPM_VMLINUX_H=$DevelDir/vmlinux.h
```
Context for where vmlinux.h is generated:
```
%if %{with_debuginfo}
# Generate vmlinux.h and put it to kernel-devel path
# zfcpdump build does not have btf anymore
if [ "$Variant" != "zfcpdump" ]; then
%{log_msg "Build the bootstrap bpftool to generate vmlinux.h"}
# Build the bootstrap bpftool to generate vmlinux.h
export BPFBOOTSTRAP_CFLAGS=$(echo "%{__global_compiler_flags}" | sed
-r "s/\-specs=[^\ ]+\/redhat-annobin-cc1//")
export BPFBOOTSTRAP_LDFLAGS=$(echo "%{__global_ldflags}" | sed -r
"s/\-specs=[^\ ]+\/redhat-annobin-cc1//")
CFLAGS="" LDFLAGS="" make EXTRA_CFLAGS="${BPFBOOTSTRAP_CFLAGS}"
EXTRA_CXXFLAGS="${BPFBOOTSTRAP_CFLAGS}"
EXTRA_LDFLAGS="${BPFBOOTSTRAP_LDFLAGS}" %{?make_opts} %{?clang_make_opts} V=1
-C tools/bpf/bpftool bootstrap
tools/bpf/bpftool/bootstrap/bpftool btf dump file vmlinux format c >
$RPM_BUILD_ROOT/$DevelDir/vmlinux.h
fi
%endif
```
For bpftool in RHEL-10.0 there is an
[issue](https://issues.redhat.com/browse/RHEL-70466?filter=-1) when building
bpftool that is resolved if we pass the already built bpftool (built in the
section above). I liked this solution because it fixed and optimized it.
--
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