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I got the impression a while back that using "/usr/src/linux" causes problem and you shouldn't use it as a link. I am only seeing everyone using links to "/usr/src/linux". Has someone changed their mind?
There's nothing actually wrong with having /usr/src/linux be a link to the source tree it just isn't the canonical location anymore (that's /lib/modules/`uname -r`/build). I generally build kernels in /usr/src/linux-`uname -r` with /usr/src/linux being a symlink to the current kernel. It's quicker to type and I know what it means however scripts shouldn't use it as there's no guarantee that it exists or is correct (the /lib/modules path is created by kernel makefiles (make modules_install I think) and so is (almost) guaranteed to be correct).
I generally go by what the README in my source files says. Like for making the kernel:
When compiling the kernel all output files will per default be
stored together with the kernel source code.
Using the option "make O=output/dir" allow you to specify an alternate
place for the output files (including .config).
kernel source code: /usr/src/linux-2.6.N
build directory: /home/name/build/kernel
To configure and build the kernel use:
make O=/home/name/build/kernel menuconfig
sudo make O=/home/name/build/kernel modules_install install
Please note: If the 'O=output/dir' option is used then it must be
used for all invocations of make.
the prohabition against using /usr/src/linux is something old
once a glibc developer practice of having some of the user space includes as symlinks to i think /usr/src/linux/asm or something got mistakenly bled into some distributions..
this caused the kernel developers to freak out and declare /usr/src/linux as a wrong thing
since /usr/src/linux is something left over from the very begining of building linux systems people sometimes associate these old wrongs with /usr/src/linux itself
there are still to this day especially solaris style builds and third paty junk like nvidia drivers that look for currently running linux kernel headers in /usr/src/linux so it can be a big help to have it there
just make sure if you use it you keep it current with what kernel you are running
on modern systems /usr/src/linux is not a problem
often people say scripts from outside Linux circles shouldn't use it but they do and it causes no harm so i don't see the problem.
a box without /usr/src/linux well just feels like some preconfigured appliance used to deliver adds to it's user ala M$