df291fa993
Fix typos in the new kbuild.txt file. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
135 lines
4.5 KiB
Plaintext
135 lines
4.5 KiB
Plaintext
Environment variables
|
|
|
|
KCPPFLAGS
|
|
--------------------------------------------------
|
|
Additional options to pass when preprocessing. The preprocessing options
|
|
will be used in all cases where kbuild does preprocessing including
|
|
building C files and assembler files.
|
|
|
|
KAFLAGS
|
|
--------------------------------------------------
|
|
Additional options to the assembler.
|
|
|
|
KCFLAGS
|
|
--------------------------------------------------
|
|
Additional options to the C compiler.
|
|
|
|
KBUILD_VERBOSE
|
|
--------------------------------------------------
|
|
Set the kbuild verbosity. Can be assigned same values as "V=...".
|
|
See make help for the full list.
|
|
Setting "V=..." takes precedence over KBUILD_VERBOSE.
|
|
|
|
KBUILD_EXTMOD
|
|
--------------------------------------------------
|
|
Set the directory to look for the kernel source when building external
|
|
modules.
|
|
The directory can be specified in several ways:
|
|
1) Use "M=..." on the command line
|
|
2) Environmnet variable KBUILD_EXTMOD
|
|
3) Environmnet variable SUBDIRS
|
|
The possibilities are listed in the order they take precedence.
|
|
Using "M=..." will always override the others.
|
|
|
|
KBUILD_OUTPUT
|
|
--------------------------------------------------
|
|
Specify the output directory when building the kernel.
|
|
The output directory can also be specificed using "O=...".
|
|
Setting "O=..." takes precedence over KBUILD_OUTPUT.
|
|
|
|
ARCH
|
|
--------------------------------------------------
|
|
Set ARCH to the architecture to be built.
|
|
In most cases the name of the architecture is the same as the
|
|
directory name found in the arch/ directory.
|
|
But some architectures such as x86 and sparc have aliases.
|
|
x86: i386 for 32 bit, x86_64 for 64 bit
|
|
sparc: sparc for 32 bit, sparc64 for 64 bit
|
|
|
|
CROSS_COMPILE
|
|
--------------------------------------------------
|
|
Specify an optional fixed part of the binutils filename.
|
|
CROSS_COMPILE can be a part of the filename or the full path.
|
|
|
|
CROSS_COMPILE is also used for ccache is some setups.
|
|
|
|
CF
|
|
--------------------------------------------------
|
|
Additional options for sparse.
|
|
CF is often used on the command-line like this:
|
|
|
|
make CF=-Wbitwise C=2
|
|
|
|
INSTALL_PATH
|
|
--------------------------------------------------
|
|
INSTALL_PATH specifies where to place the updated kernel and system map
|
|
images. Default is /boot, but you can set it to other values.
|
|
|
|
|
|
MODLIB
|
|
--------------------------------------------------
|
|
Specify where to install modules.
|
|
The default value is:
|
|
|
|
$(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
|
|
|
|
The value can be overridden in which case the default value is ignored.
|
|
|
|
INSTALL_MOD_PATH
|
|
--------------------------------------------------
|
|
INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
|
|
relocations required by build roots. This is not defined in the
|
|
makefile but the argument can be passed to make if needed.
|
|
|
|
INSTALL_MOD_STRIP
|
|
--------------------------------------------------
|
|
INSTALL_MOD_STRIP, if defined, will cause modules to be
|
|
stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
|
|
the default option --strip-debug will be used. Otherwise,
|
|
INSTALL_MOD_STRIP will used as the options to the strip command.
|
|
|
|
INSTALL_FW_PATH
|
|
--------------------------------------------------
|
|
INSTALL_FW_PATH specifies where to install the firmware blobs.
|
|
The default value is:
|
|
|
|
$(INSTALL_MOD_PATH)/lib/firmware
|
|
|
|
The value can be overridden in which case the default value is ignored.
|
|
|
|
INSTALL_HDR_PATH
|
|
--------------------------------------------------
|
|
INSTALL_HDR_PATH specifies where to install user space headers when
|
|
executing "make headers_*".
|
|
The default value is:
|
|
|
|
$(objtree)/usr
|
|
|
|
$(objtree) is the directory where output files are saved.
|
|
The output directory is often set using "O=..." on the commandline.
|
|
|
|
The value can be overridden in which case the default value is ignored.
|
|
|
|
KBUILD_MODPOST_WARN
|
|
--------------------------------------------------
|
|
KBUILD_MODPOST_WARN can be set to avoid errors in case of undefined
|
|
symbols in the final module linking stage. It changes such errors
|
|
into warnings.
|
|
|
|
KBUILD_MODPOST_NOFINAL
|
|
--------------------------------------------------
|
|
KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
|
|
This is solely useful to speed up test compiles.
|
|
|
|
KBUILD_EXTRA_SYMBOLS
|
|
--------------------------------------------------
|
|
For modules that use symbols from other modules.
|
|
See more details in modules.txt.
|
|
|
|
ALLSOURCE_ARCHS
|
|
--------------------------------------------------
|
|
For tags/TAGS/cscope targets, you can specify more than one arch
|
|
to be included in the databases, separated by blank space. E.g.:
|
|
|
|
$ make ALLSOURCE_ARCHS="x86 mips arm" tags
|