BuildingKernel3.2Stretch.md

+# Based on: https://wiki.debian.org/HowToCrossBuildAnOfficialDebianKernelPackage
+
+# install requisite packages
+```
+apt-get install \
+  unifdef \
+  cpio \
+  rsync \
+  fakeroot \
+  git \
+  kernel-wedge \
+  quilt \
+  ccache
+```
+
+# clone repository
+```
+git clone -n https://git.ligo.org/cds-packaging/debian-kernel-rtcds.git debian-kernel
+cd debian-kernel
+```
+
+# list all tags
+```
+git tag -l
+```
+
+# starting from a release is a good idea
+# perhaps using uname -a to see what you're running now?
+```
+#git checkout -b wheezy-3.2.96-3 debian/3.2.96-3
+git checkout ligo/rtcds-3.2
+```
+
+# get whole git repo from internet, more than 1GB and may need hours to finish
+```
+git clone https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable ../linux-stable
+```
+
+# generate DFSG compatible kernel source
+```
+debian/bin/genorig.py ../linux-stable
+```
+
+# generate debian/control
+```
+debian/bin/gencontrol.py
+```
+
+# install a few build bits needed (per debian/control file)
+```
+mk-build-deps -ri
+```
+
+# This triplet is defined in
+#   `https://anonscm.debian.org/cgit/kernel/linux.git/tree/debian/config/<ARCH>/`
+# and its sub-directories.
+# Here is just an example
+```
+ARCH=amd64
+FEATURESET=rtcds
+FLAVOUR=none
+```
+
+# fix up PATH
+```
+export $(dpkg-architecture -a$ARCH)`
+export PATH=/usr/lib/ccache:$PATH
+```
+
+# Build profiles is from: https://anonscm.debian.org/cgit/kernel/linux.git/tree/debian/README.source
+```
+export DEB_BUILD_PROFILES="nopython nodoc pkg.linux.notools"
+```
+
+# Enable build in parallel
+```
+export MAKEFLAGS="-j$(($(nproc)*2))"
+```
+
+# Disable -dbg (debug) package is only possible when distribution="UNRELEASED" in debian/changelog
+```
+export DEBIAN_KERNEL_DISABLE_DEBUG=
+[ "$(dpkg-parsechangelog --show-field Distribution)" = "UNRELEASED" ] &&
+  export DEBIAN_KERNEL_DISABLE_DEBUG=yes
+```
+
+# build the orig/source tarballs
+```
+fakeroot make -f debian/rules clean
+fakeroot make -f debian/rules orig
+fakeroot make -f debian/rules source
+```
+
+# set up build tree
+```
+fakeroot make -f debian/rules.gen setup_${ARCH}_${FEATURESET}
+```
+
+# ... and run the build
+```
+fakeroot make -f debian/rules.gen binary-arch_${ARCH}_${FEATURESET}
+```
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