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269 lines
7.4 KiB
269 lines
7.4 KiB
====== |
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Kbuild |
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====== |
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Output files |
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============ |
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modules.order |
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------------- |
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This file records the order in which modules appear in Makefiles. This |
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is used by modprobe to deterministically resolve aliases that match |
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multiple modules. |
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modules.builtin |
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--------------- |
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This file lists all modules that are built into the kernel. This is used |
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by modprobe to not fail when trying to load something builtin. |
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modules.builtin.modinfo |
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----------------------- |
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This file contains modinfo from all modules that are built into the kernel. |
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Unlike modinfo of a separate module, all fields are prefixed with module name. |
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Environment variables |
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===================== |
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KCPPFLAGS |
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--------- |
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Additional options to pass when preprocessing. The preprocessing options |
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will be used in all cases where kbuild does preprocessing including |
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building C files and assembler files. |
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KAFLAGS |
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------- |
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Additional options to the assembler (for built-in and modules). |
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AFLAGS_MODULE |
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------------- |
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Additional assembler options for modules. |
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AFLAGS_KERNEL |
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------------- |
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Additional assembler options for built-in. |
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KCFLAGS |
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------- |
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Additional options to the C compiler (for built-in and modules). |
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CFLAGS_KERNEL |
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------------- |
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Additional options for $(CC) when used to compile |
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code that is compiled as built-in. |
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CFLAGS_MODULE |
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------------- |
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Additional module specific options to use for $(CC). |
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LDFLAGS_MODULE |
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-------------- |
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Additional options used for $(LD) when linking modules. |
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HOSTCFLAGS |
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---------- |
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Additional flags to be passed to $(HOSTCC) when building host programs. |
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HOSTCXXFLAGS |
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------------ |
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Additional flags to be passed to $(HOSTCXX) when building host programs. |
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HOSTLDFLAGS |
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----------- |
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Additional flags to be passed when linking host programs. |
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HOSTLDLIBS |
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---------- |
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Additional libraries to link against when building host programs. |
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KBUILD_KCONFIG |
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-------------- |
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Set the top-level Kconfig file to the value of this environment |
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variable. The default name is "Kconfig". |
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KBUILD_VERBOSE |
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-------------- |
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Set the kbuild verbosity. Can be assigned same values as "V=...". |
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See make help for the full list. |
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Setting "V=..." takes precedence over KBUILD_VERBOSE. |
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KBUILD_EXTMOD |
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------------- |
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Set the directory to look for the kernel source when building external |
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modules. |
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Setting "M=..." takes precedence over KBUILD_EXTMOD. |
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KBUILD_OUTPUT |
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------------- |
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Specify the output directory when building the kernel. |
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The output directory can also be specified using "O=...". |
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Setting "O=..." takes precedence over KBUILD_OUTPUT. |
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KBUILD_EXTRA_WARN |
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----------------- |
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Specify the extra build checks. The same value can be assigned by passing |
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W=... from the command line. |
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See `make help` for the list of the supported values. |
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Setting "W=..." takes precedence over KBUILD_EXTRA_WARN. |
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KBUILD_DEBARCH |
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-------------- |
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For the deb-pkg target, allows overriding the normal heuristics deployed by |
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deb-pkg. Normally deb-pkg attempts to guess the right architecture based on |
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the UTS_MACHINE variable, and on some architectures also the kernel config. |
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The value of KBUILD_DEBARCH is assumed (not checked) to be a valid Debian |
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architecture. |
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ARCH |
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---- |
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Set ARCH to the architecture to be built. |
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In most cases the name of the architecture is the same as the |
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directory name found in the arch/ directory. |
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But some architectures such as x86 and sparc have aliases. |
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- x86: i386 for 32 bit, x86_64 for 64 bit |
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- sh: sh for 32 bit, sh64 for 64 bit |
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- sparc: sparc32 for 32 bit, sparc64 for 64 bit |
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CROSS_COMPILE |
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------------- |
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Specify an optional fixed part of the binutils filename. |
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CROSS_COMPILE can be a part of the filename or the full path. |
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CROSS_COMPILE is also used for ccache in some setups. |
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CF |
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-- |
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Additional options for sparse. |
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CF is often used on the command-line like this:: |
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make CF=-Wbitwise C=2 |
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INSTALL_PATH |
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------------ |
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INSTALL_PATH specifies where to place the updated kernel and system map |
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images. Default is /boot, but you can set it to other values. |
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INSTALLKERNEL |
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------------- |
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Install script called when using "make install". |
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The default name is "installkernel". |
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The script will be called with the following arguments: |
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- $1 - kernel version |
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- $2 - kernel image file |
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- $3 - kernel map file |
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- $4 - default install path (use root directory if blank) |
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The implementation of "make install" is architecture specific |
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and it may differ from the above. |
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INSTALLKERNEL is provided to enable the possibility to |
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specify a custom installer when cross compiling a kernel. |
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MODLIB |
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------ |
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Specify where to install modules. |
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The default value is:: |
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$(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) |
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The value can be overridden in which case the default value is ignored. |
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INSTALL_MOD_PATH |
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---------------- |
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INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory |
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relocations required by build roots. This is not defined in the |
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makefile but the argument can be passed to make if needed. |
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INSTALL_MOD_STRIP |
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----------------- |
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INSTALL_MOD_STRIP, if defined, will cause modules to be |
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stripped after they are installed. If INSTALL_MOD_STRIP is '1', then |
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the default option --strip-debug will be used. Otherwise, |
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INSTALL_MOD_STRIP value will be used as the options to the strip command. |
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INSTALL_HDR_PATH |
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---------------- |
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INSTALL_HDR_PATH specifies where to install user space headers when |
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executing "make headers_*". |
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The default value is:: |
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$(objtree)/usr |
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$(objtree) is the directory where output files are saved. |
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The output directory is often set using "O=..." on the commandline. |
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The value can be overridden in which case the default value is ignored. |
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KBUILD_ABS_SRCTREE |
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-------------------------------------------------- |
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Kbuild uses a relative path to point to the tree when possible. For instance, |
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when building in the source tree, the source tree path is '.' |
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Setting this flag requests Kbuild to use absolute path to the source tree. |
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There are some useful cases to do so, like when generating tag files with |
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absolute path entries etc. |
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KBUILD_SIGN_PIN |
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--------------- |
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This variable allows a passphrase or PIN to be passed to the sign-file |
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utility when signing kernel modules, if the private key requires such. |
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KBUILD_MODPOST_WARN |
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------------------- |
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KBUILD_MODPOST_WARN can be set to avoid errors in case of undefined |
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symbols in the final module linking stage. It changes such errors |
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into warnings. |
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KBUILD_MODPOST_NOFINAL |
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---------------------- |
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KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. |
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This is solely useful to speed up test compiles. |
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KBUILD_EXTRA_SYMBOLS |
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-------------------- |
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For modules that use symbols from other modules. |
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See more details in modules.rst. |
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ALLSOURCE_ARCHS |
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--------------- |
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For tags/TAGS/cscope targets, you can specify more than one arch |
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to be included in the databases, separated by blank space. E.g.:: |
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$ make ALLSOURCE_ARCHS="x86 mips arm" tags |
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To get all available archs you can also specify all. E.g.:: |
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$ make ALLSOURCE_ARCHS=all tags |
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KBUILD_BUILD_TIMESTAMP |
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---------------------- |
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Setting this to a date string overrides the timestamp used in the |
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UTS_VERSION definition (uname -v in the running kernel). The value has to |
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be a string that can be passed to date -d. The default value |
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is the output of the date command at one point during build. |
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KBUILD_BUILD_USER, KBUILD_BUILD_HOST |
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------------------------------------ |
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These two variables allow to override the user@host string displayed during |
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boot and in /proc/version. The default value is the output of the commands |
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whoami and host, respectively. |
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LLVM |
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---- |
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If this variable is set to 1, Kbuild will use Clang and LLVM utilities instead |
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of GCC and GNU binutils to build the kernel.
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