Re: Compile Bogons in 2.4.19-rc3 with Caldera OpenLinux 3.1's patched 2.95.2

[Brad Hards <bhards@bigpond.net.au>]

On Wed, 24 Jul 2002 19:16, Russell King wrote:
> On Wed, Jul 24, 2002 at 05:03:52AM -0400, D. A. M. Revok wrote:
> > Oh, fucking great, /usr/include/asm /isn't/ a symlink to
> > /usr/src/linux/include/asm, it's its own directory.
>
> That's 100% correct.  /usr/include/asm and /usr/include/linux are supposed
> to be the kernel headers glibc was compiled with, not the kernel headers
> for the kernel you're trying to build.
I don't think that this is the whole story.

Some applications talk to the kernel (eg via ioctl()). This is related to the 
kernel version that is running (not anything to do with the libs).

In reality, we need three sets of headers:
1. Things that are kernel independent, and depend on the glibc functionality
This is probably /usr/include
2. Things that are related to the kernel that the libs are compiled against
This is probably /usr/include/sys
3. Things that are related to the kernel that is running.
This is probably /usr/include/linux

The hard part is that the applications need to be matched to the kernel
binary API, which is essentially an impossible problem unless you have
a source tree that you recompile whenever you change the kernel 
API (and an API versioning system that tells you which version you 
need for each application).

Brad
-- 
http://conf.linux.org.au. 22-25Jan2003. Perth, Australia. Birds in Black.