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From wrote:
> Just out of curiosity, what would happen with redirection if your source
> tree for 'the currently running kernel' version happens to be configured
> for a different 'the currently running kernel', perhaps a machine of a
> foreign arch that you are cross-compiling for?

Two choices:
1) try to find an alternative. If there's none, fail.
2) make the corresponding asm or asm/arch branch available (non-trivial
and maybe not desirable)

> I do this: I use ONE machine to compile kernels for five: four i386 and
> one SUN4C. My other machines don't even HAVE /usr/src/linux, so where does
> this redirection leave them?

Depends on your distribution: if it doesn't install any kernel-specific
headers, you wouldn't be able to compile programs requiring anything
beyond what it provided by your libc. Otherwise, there could be a
default location (such as /usr/src/linux is a default location now).

The main advantage of a script would be that one could easily compile
for multiple kernels, e.g. with

export TARGET_KERNEL=2.0.4

Even if your system is running 2.4.13-test1.

The architecture could be obtained from the tree or the tree could be
picked based on the architecture. This is a policy decision that could
be hidden in the script.

- Werner

/ Werner Almesberger, ICA, EPFL, CH /
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