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235 lines
8.1 KiB
235 lines
8.1 KiB
Output files |
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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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Environment variables |
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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 module specific options to use for $(AS). |
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AFLAGS_KERNEL |
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-------------------------------------------------- |
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Additional options for $(AS) when used for assembler |
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code for code that is compiled as 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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LDFLAGS_vmlinux |
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-------------------------------------------------- |
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Additional options passed to final link of vmlinux. |
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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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The directory can be specified in several ways: |
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1) Use "M=..." on the command line |
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2) Environment variable KBUILD_EXTMOD |
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3) Environment variable SUBDIRS |
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The possibilities are listed in the order they take precedence. |
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Using "M=..." will always override the others. |
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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_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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sparc: sparc 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/$(KERNELRELEASE) |
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The value can be overridden in which case the default value is ignored. |
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INSTALL_MOD_PATH |
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-------------------------------------------------- |
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INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory |
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relocations required by build roots. This is not defined in the |
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makefile but the argument can be passed to make if needed. |
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INSTALL_MOD_STRIP |
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-------------------------------------------------- |
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INSTALL_MOD_STRIP, if defined, will cause modules to be |
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stripped after they are installed. If INSTALL_MOD_STRIP is '1', then |
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the default option --strip-debug will be used. Otherwise, |
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INSTALL_MOD_STRIP value will be used as the options to the strip command. |
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INSTALL_FW_PATH |
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-------------------------------------------------- |
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INSTALL_FW_PATH specifies where to install the firmware blobs. |
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The default value is: |
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$(INSTALL_MOD_PATH)/lib/firmware |
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The value can be overridden in which case the default value is ignored. |
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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_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.txt. |
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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_ENABLE_EXTRA_GCC_CHECKS |
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-------------------------------------------------- |
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If enabled over the make command line with "W=1", it turns on additional |
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gcc -W... options for more extensive build-time checking. |
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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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KBUILD_LDS |
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-------------------------------------------------- |
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The linker script with full path. Assigned by the top-level Makefile. |
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KBUILD_VMLINUX_INIT |
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-------------------------------------------------- |
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All object files for the init (first) part of vmlinux. |
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Files specified with KBUILD_VMLINUX_INIT are linked first. |
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KBUILD_VMLINUX_MAIN |
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-------------------------------------------------- |
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All object files for the main part of vmlinux. |
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KBUILD_VMLINUX_INIT and KBUILD_VMLINUX_MAIN together specify |
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all the object files used to link vmlinux.
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