how to build kernel-firmware and kernel-doc RPMs from Red Hat EL6 kernel.spec files ?

From: Jason Vas Dias
Date: Mon Sep 22 2014 - 08:48:12 EST

Sorry for this newbie question, but its been a while since I built the
kernel from the Red Hat source RPMs, and there appears to be no way to
build the kernel-firmware-*.noarch.rpm RPM package without
modifying the spec file, which contains :
l# we don't want a .config file when building firmware: it just
confuses the build system
%define build_firmware \
mv .config .config.firmware_save \
make INSTALL_FW_PATH=$RPM_BUILD_ROOT/lib/firmware firmware_install \
mv .config.firmware_save .config

When intending to build the kernel-doc and kernel-firmware noarch
RPMs, after the
x86_64 RPMs have successfully built, with:
$ rpmbuild --target=noarch --rebuild $path_to_kernel_srpm --define
'_with_docs 1' --define '_with_firmware 1' --define '_without_perf 1' ...
this fails :
+ cd ${BUILDROOT}/lib/modules/
+ ln -s kabi-rhel65 kabi-current
+ mv .config .config.firmware_save
+ make INSTALL_FW_PATH=${BUILDROOT}/lib/firmware firmware_install
scripts/kconfig/conf -s arch/x86/Kconfig
*** You have not yet configured your kernel!
*** (missing kernel config file ".config")
*** Please run some configurator (e.g. "make oldconfig" or
*** "make menuconfig" or "make xconfig").
${BUILD}/scripts/kconfig/Makefile:30: recipe for target 'silentoldconfig' failed
make[2]: *** [silentoldconfig] Error 1
${BUILD}/Makefile:484: recipe for target 'silentoldconfig' failed
make[1]: *** [silentoldconfig] Error 2
IHEX firmware/iwlwifi-105-6.ucode
make[1]: *** No rule to make target '${BUILDROOT}/lib/firmware/./',
needed by '${BUILDROOT}/lib/firmware/iwlwifi-105-6.ucode'. Stop.
Makefile:1112: recipe for target 'firmware_install' failed
make: *** [firmware_install] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.3a7tvf (%install)
(with the $BUILD and $BUILDROOT strings representing actual paths).

So I have to edit that bit of the .spec file to be:
%define build_firmware \
make INSTALL_FW_PATH=$RPM_BUILD_ROOT/lib/firmware firmware_install
and then I can 'rpmbuild --target -ba $path_to_modified_spec_file' OK and
the firmware and documentation RPMs are produced OK .

Has anyone found a way of avoiding having to edit the Red Hat RPM spec file
in this manner to enable building noarch kernel-doc and kernel-firmware RPMs ?
This happens with every RHEL-6.4 kernel I've built so far :

Incidentally, anyone found a way to build the Red Hat RPMs without
"--define '_with_perf 0'" ?
It seems this causes the build to look for libunwind and the Android
SDK headers,
which are not part of the kernel's BuildRequires .

Thanks in advance for any helpful replies, best Regards,
Jason Vas Dias
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