Add EXTRAVERSION to Kernel Build Instructions

[bdubbs@…]

When we build the kernel, we are overlooking a technique that could help a lot of users: using the EXTRAVERSION variable in the kernel's main Makefile.

VERSION=2.4.22 DATE=date +-%Y%m%d make CC=/opt/gcc-2.95.3/bin/gcc EXTRAVERSION=-lfs$DATE dep make CC=/opt/gcc-2.95.3/bin/gcc EXTRAVERSION=-lfs$DATE bzImage make CC=/opt/gcc-2.95.3/bin/gcc EXTRAVERSION=-lfs$DATE modules make CC=/opt/gcc-2.95.3/bin/gcc EXTRAVERSION=-lfs$DATE modules_install

cp arch/i386/boot/bzImage /boot/linux-${VERSION}-lfs${DATE} cp System.map /boot/System.map-${VERSION}-lfs${DATE}

Add

<note>By using the EXTRAVERSION, the you can do multiple builds of the same kernel version without overwriting previous builds. The modules are preserved. Also, the version number is embedded so that <userinput>uname -r</userinput> gives the matching value and allows the system to automatically find its first choice for <filename>System.map</filename> &mdash; <filename>System.map-uname -r.</filename></note>

[jeremy@…]

This is something we can talk about for the next version of LFS.

[greg@…]

I'll repeat what I said on the list. This is quite a nifty idea. But I feel not suitable for the book. I think it's more suited to a hint.

[gerard@…]

I agree with others, this is a bit too much for the book. I prefer if we stick to the basics of installation. Bruce, would you mind, though, writing a hint about this? Might be good to reference that hint in the book if nothing else?