On 04/08/07, Rob Landley <[email protected]> wrote:
> From: Rob Landley <[email protected]>
>
> Signed-off-by: Rob Landley <[email protected]>
>
> Some documentation for "make headers_install".
>
> ---
>
> Earlier discussion was at http://lkml.org/lkml/2007/6/22/7 and I
> believe I've responded to all of David's comments.
>
> --- /dev/null 2007-04-23 10:59:00.000000000 -0500
> +++ linux-2.6/Documentation/make/headers_install.txt 2007-08-04 13:04:51.000000000 -0500
> @@ -0,0 +1,46 @@
> +Exporting kernel headers for use by userspace
> +=============================================
> +
> +The "make headers_install" command exports the kernel's header files in a
> +form suitable for use by userspace programs.
> +
> +The linux kernel's exported header files describe the API for user space
> +programs attempting to use kernel services. These kernel header files are
> +used by the system's C library (such as glibc or uClibc) to define available
> +system calls, as well as constants and structures to be used with these
> +system calls. The C library's header files include the kernel header files
> +from the "linux" subdirectory. The system's libc headers are usually
> +installed at the default location /usr/include and the kernel headers in
> +subdirectories under that (most notably /usr/include/linux and
> +/usr/include/asm).
> +
> +Kernel headers are backwards compatible, but not forwards compatible. This
Perhaps change the text "are backwards compatible" into "try very hard
to be backwards compatible" ... ?
> +means that a program built against a C library using older kernel headers
> +should run on a newer kernel (although it may not have access to new
> +features), but a program built against newer kernel headers may not work on an
> +older kernel.
> +
> +The "make headers_install" command can be run in the top level directory of the
> +kernel source code (or using a standard out-of-tree build). It takes two
> +optional arguments:
> +
> + make headers_install ARCH=i386 INSTALL_HDR_PATH=/usr/include
> +
> +ARCH indicates which architecture to produce headers for, and defaults to the
> +current architecture. The linux/asm directory of the exported kernel headers
> +is platform-specific, to see a complete list of supported architectures use
> +the command:
how about s/"the command"/"the following command from inside a kernel
source tree"/ ?
> +
> + ls -d include/asm-* | sed 's/.*-//'
> +
> +INSTALL_HDR_PATH indicates where to install the headers. It defaults to
> +"./usr/include".
> +
> +The command "make headers_install_all" exports headers for all architectures
> +simultaneously. (This is mostly of interest to distribution maintainers,
> +who create an architecture-independent tarball from the resulting include
> +directory.) Remember to provide the appropriate linux/asm directory via "mv"
> +or "ln -s" before building a C library with headers exported this way.
> +
> +The kernel header export infrastructure is maintained by David Woodhouse
> +<[email protected]>.
>
Overall, looks good.
Acked by: Jesper Juhl <[email protected]>
--
Jesper Juhl <[email protected]>
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