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author | Rob Landley <rob@landley.net> | 2007-10-16 23:31:16 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:43:05 -0700 |
commit | 451ad114c6d8c5d39fd41d886fe87179d012ac73 (patch) | |
tree | 48fad4816938f4113df89ee13b6aa4205fef740d /Documentation/make | |
parent | 1ee052253c780493fa8814c1fe83e87494ae694d (diff) | |
download | lwn-451ad114c6d8c5d39fd41d886fe87179d012ac73.tar.gz lwn-451ad114c6d8c5d39fd41d886fe87179d012ac73.zip |
Documentation/make/headers_install.txt
Some documentation for "make headers_install".
Signed-off-by: Rob Landley <rob@landley.net>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/make')
-rw-r--r-- | Documentation/make/headers_install.txt | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/make/headers_install.txt b/Documentation/make/headers_install.txt new file mode 100644 index 000000000000..f2481cabffcb --- /dev/null +++ b/Documentation/make/headers_install.txt @@ -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 +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: + + 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 +<dwmw2@infradead.org>. |