2019-06-13 01:52:48 +08:00
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======
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Kbuild
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======
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2009-12-07 23:38:33 +08:00
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Output files
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2019-06-13 01:52:48 +08:00
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============
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2009-12-07 23:38:33 +08:00
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modules.order
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2019-06-13 01:52:48 +08:00
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-------------
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2009-12-07 23:38:33 +08:00
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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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2019-06-13 01:52:48 +08:00
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---------------
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2009-12-07 23:38:33 +08:00
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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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2019-04-30 00:11:14 +08:00
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modules.builtin.modinfo
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2019-07-10 00:25:51 +08:00
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-----------------------
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2019-04-30 00:11:14 +08:00
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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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2009-12-07 23:38:33 +08:00
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2008-12-29 20:45:52 +08:00
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Environment variables
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2019-06-13 01:52:48 +08:00
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=====================
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2008-12-29 20:45:52 +08:00
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KCPPFLAGS
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2019-06-13 01:52:48 +08:00
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---------
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2008-12-29 20:45:52 +08:00
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Additional options to pass when preprocessing. The preprocessing options
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2009-01-09 02:59:34 +08:00
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will be used in all cases where kbuild does preprocessing including
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2008-12-29 20:45:52 +08:00
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building C files and assembler files.
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KAFLAGS
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2019-06-13 01:52:48 +08:00
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-------
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kbuild: allow assignment to {A,C,LD}FLAGS_MODULE on the command line
It is now possible to assign options to AS, CC and LD
on the command line - which is only used when building modules.
{A,C,LD}FLAGS_MODULE was all used both in the top-level Makefile
in the arch makefiles, thus users had no way to specify
additional options to AS, CC, LD when building modules
without overriding the original value.
Introduce a new set of variables KBUILD_{A,C,LD}FLAGS_MODULE
that is used by arch specific files and free up
{A,C,LD}FLAGS_MODULE so they can be assigned on
the command line.
All arch Makefiles that used the old variables has been updated.
Note: Previously we had a MODFLAGS variable for both
AS and CC. But in favour of consistency this was dropped.
So in some cases arch Makefile has one assignmnet replaced by
two assignmnets.
Note2: MODFLAGS was not documented and is dropped
without any notice. I do not expect much/any breakage
from this.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Acked-by: Mike Frysinger <vapier@gentoo.org> [blackfin]
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> [avr32]
Signed-off-by: Michal Marek <mmarek@suse.cz>
2010-07-28 23:33:09 +08:00
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Additional options to the assembler (for built-in and modules).
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AFLAGS_MODULE
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2019-06-13 01:52:48 +08:00
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-------------
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2019-07-13 10:45:58 +08:00
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Additional assembler options for modules.
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2008-12-29 20:45:52 +08:00
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2010-07-29 01:11:27 +08:00
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AFLAGS_KERNEL
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2019-06-13 01:52:48 +08:00
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-------------
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2019-07-13 10:45:58 +08:00
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Additional assembler options for built-in.
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2008-12-29 20:45:52 +08:00
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KCFLAGS
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2019-06-13 01:52:48 +08:00
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-------
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kbuild: allow assignment to {A,C,LD}FLAGS_MODULE on the command line
It is now possible to assign options to AS, CC and LD
on the command line - which is only used when building modules.
{A,C,LD}FLAGS_MODULE was all used both in the top-level Makefile
in the arch makefiles, thus users had no way to specify
additional options to AS, CC, LD when building modules
without overriding the original value.
Introduce a new set of variables KBUILD_{A,C,LD}FLAGS_MODULE
that is used by arch specific files and free up
{A,C,LD}FLAGS_MODULE so they can be assigned on
the command line.
All arch Makefiles that used the old variables has been updated.
Note: Previously we had a MODFLAGS variable for both
AS and CC. But in favour of consistency this was dropped.
So in some cases arch Makefile has one assignmnet replaced by
two assignmnets.
Note2: MODFLAGS was not documented and is dropped
without any notice. I do not expect much/any breakage
from this.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Acked-by: Mike Frysinger <vapier@gentoo.org> [blackfin]
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> [avr32]
Signed-off-by: Michal Marek <mmarek@suse.cz>
2010-07-28 23:33:09 +08:00
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Additional options to the C compiler (for built-in and modules).
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2010-07-29 01:11:27 +08:00
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CFLAGS_KERNEL
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2019-06-13 01:52:48 +08:00
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-------------
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2011-03-31 09:57:33 +08:00
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Additional options for $(CC) when used to compile
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2010-07-29 01:11:27 +08:00
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code that is compiled as built-in.
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kbuild: allow assignment to {A,C,LD}FLAGS_MODULE on the command line
It is now possible to assign options to AS, CC and LD
on the command line - which is only used when building modules.
{A,C,LD}FLAGS_MODULE was all used both in the top-level Makefile
in the arch makefiles, thus users had no way to specify
additional options to AS, CC, LD when building modules
without overriding the original value.
Introduce a new set of variables KBUILD_{A,C,LD}FLAGS_MODULE
that is used by arch specific files and free up
{A,C,LD}FLAGS_MODULE so they can be assigned on
the command line.
All arch Makefiles that used the old variables has been updated.
Note: Previously we had a MODFLAGS variable for both
AS and CC. But in favour of consistency this was dropped.
So in some cases arch Makefile has one assignmnet replaced by
two assignmnets.
Note2: MODFLAGS was not documented and is dropped
without any notice. I do not expect much/any breakage
from this.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Acked-by: Mike Frysinger <vapier@gentoo.org> [blackfin]
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> [avr32]
Signed-off-by: Michal Marek <mmarek@suse.cz>
2010-07-28 23:33:09 +08:00
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CFLAGS_MODULE
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2019-06-13 01:52:48 +08:00
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-------------
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2011-03-31 09:57:33 +08:00
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Additional module specific options to use for $(CC).
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kbuild: allow assignment to {A,C,LD}FLAGS_MODULE on the command line
It is now possible to assign options to AS, CC and LD
on the command line - which is only used when building modules.
{A,C,LD}FLAGS_MODULE was all used both in the top-level Makefile
in the arch makefiles, thus users had no way to specify
additional options to AS, CC, LD when building modules
without overriding the original value.
Introduce a new set of variables KBUILD_{A,C,LD}FLAGS_MODULE
that is used by arch specific files and free up
{A,C,LD}FLAGS_MODULE so they can be assigned on
the command line.
All arch Makefiles that used the old variables has been updated.
Note: Previously we had a MODFLAGS variable for both
AS and CC. But in favour of consistency this was dropped.
So in some cases arch Makefile has one assignmnet replaced by
two assignmnets.
Note2: MODFLAGS was not documented and is dropped
without any notice. I do not expect much/any breakage
from this.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Acked-by: Mike Frysinger <vapier@gentoo.org> [blackfin]
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> [avr32]
Signed-off-by: Michal Marek <mmarek@suse.cz>
2010-07-28 23:33:09 +08:00
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LDFLAGS_MODULE
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2019-06-13 01:52:48 +08:00
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--------------
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kbuild: allow assignment to {A,C,LD}FLAGS_MODULE on the command line
It is now possible to assign options to AS, CC and LD
on the command line - which is only used when building modules.
{A,C,LD}FLAGS_MODULE was all used both in the top-level Makefile
in the arch makefiles, thus users had no way to specify
additional options to AS, CC, LD when building modules
without overriding the original value.
Introduce a new set of variables KBUILD_{A,C,LD}FLAGS_MODULE
that is used by arch specific files and free up
{A,C,LD}FLAGS_MODULE so they can be assigned on
the command line.
All arch Makefiles that used the old variables has been updated.
Note: Previously we had a MODFLAGS variable for both
AS and CC. But in favour of consistency this was dropped.
So in some cases arch Makefile has one assignmnet replaced by
two assignmnets.
Note2: MODFLAGS was not documented and is dropped
without any notice. I do not expect much/any breakage
from this.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Acked-by: Mike Frysinger <vapier@gentoo.org> [blackfin]
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> [avr32]
Signed-off-by: Michal Marek <mmarek@suse.cz>
2010-07-28 23:33:09 +08:00
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Additional options used for $(LD) when linking modules.
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2008-12-29 20:45:52 +08:00
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2018-07-10 08:46:02 +08:00
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HOSTCFLAGS
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2019-06-13 01:52:48 +08:00
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----------
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2018-07-10 08:46:02 +08:00
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Additional flags to be passed to $(HOSTCC) when building host programs.
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HOSTCXXFLAGS
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2019-06-13 01:52:48 +08:00
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------------
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2018-07-10 08:46:02 +08:00
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Additional flags to be passed to $(HOSTCXX) when building host programs.
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HOSTLDFLAGS
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2019-06-13 01:52:48 +08:00
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-----------
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2018-07-10 08:46:02 +08:00
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Additional flags to be passed when linking host programs.
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HOSTLDLIBS
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2019-06-13 01:52:48 +08:00
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----------
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2018-07-10 08:46:02 +08:00
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Additional libraries to link against when building host programs.
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2022-02-02 05:35:42 +08:00
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.. _userkbuildflags:
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USERCFLAGS
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----------
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Additional options used for $(CC) when compiling userprogs.
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USERLDFLAGS
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-----------
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Additional options used for $(LD) when linking userprogs. userprogs are linked
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with CC, so $(USERLDFLAGS) should include "-Wl," prefix as applicable.
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2018-07-05 10:47:39 +08:00
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KBUILD_KCONFIG
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2019-06-13 01:52:48 +08:00
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--------------
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2018-07-05 10:47:39 +08:00
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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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2008-12-29 20:45:52 +08:00
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KBUILD_VERBOSE
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2019-06-13 01:52:48 +08:00
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--------------
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2009-01-09 02:59:34 +08:00
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Set the kbuild verbosity. Can be assigned same values as "V=...".
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2019-06-13 01:52:48 +08:00
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2008-12-29 20:45:52 +08:00
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See make help for the full list.
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2019-06-13 01:52:48 +08:00
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2008-12-29 20:45:52 +08:00
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Setting "V=..." takes precedence over KBUILD_VERBOSE.
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KBUILD_EXTMOD
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2019-06-13 01:52:48 +08:00
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-------------
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2008-12-29 20:45:52 +08:00
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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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2019-06-13 01:52:48 +08:00
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2018-11-20 23:04:18 +08:00
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Setting "M=..." takes precedence over KBUILD_EXTMOD.
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2008-12-29 20:45:52 +08:00
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KBUILD_OUTPUT
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2019-06-13 01:52:48 +08:00
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-------------
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2008-12-29 20:45:52 +08:00
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Specify the output directory when building the kernel.
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2019-06-13 01:52:48 +08:00
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2010-08-06 02:23:11 +08:00
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The output directory can also be specified using "O=...".
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2019-06-13 01:52:48 +08:00
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2009-01-09 02:59:34 +08:00
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Setting "O=..." takes precedence over KBUILD_OUTPUT.
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2008-12-29 20:45:52 +08:00
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2019-09-01 00:25:55 +08:00
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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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2010-12-13 01:39:40 +08:00
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KBUILD_DEBARCH
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2019-06-13 01:52:48 +08:00
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--------------
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2010-12-13 01:39:40 +08:00
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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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2008-12-29 20:45:52 +08:00
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ARCH
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2019-06-13 01:52:48 +08:00
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----
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2008-12-29 20:45:52 +08:00
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Set ARCH to the architecture to be built.
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2019-06-13 01:52:48 +08:00
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2008-12-29 20:45:52 +08:00
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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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2019-06-13 01:52:48 +08:00
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2009-01-09 02:59:34 +08:00
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But some architectures such as x86 and sparc have aliases.
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2019-06-13 01:52:48 +08:00
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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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2008-12-29 20:45:52 +08:00
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CROSS_COMPILE
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2019-06-13 01:52:48 +08:00
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-------------
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2008-12-29 20:45:52 +08:00
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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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2010-02-17 16:45:33 +08:00
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CROSS_COMPILE is also used for ccache in some setups.
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2008-12-29 20:45:52 +08:00
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CF
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2019-06-13 01:52:48 +08:00
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--
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2008-12-29 20:45:52 +08:00
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Additional options for sparse.
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2019-06-13 01:52:48 +08:00
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CF is often used on the command-line like this::
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2008-12-29 20:45:52 +08:00
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make CF=-Wbitwise C=2
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INSTALL_PATH
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2019-06-13 01:52:48 +08:00
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------------
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2008-12-29 20:45:52 +08:00
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INSTALL_PATH specifies where to place the updated kernel and system map
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2009-01-09 02:59:34 +08:00
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images. Default is /boot, but you can set it to other values.
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2008-12-29 20:45:52 +08:00
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2009-07-21 03:37:11 +08:00
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INSTALLKERNEL
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2019-06-13 01:52:48 +08:00
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-------------
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2009-07-21 03:37:11 +08:00
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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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2019-07-10 00:25:51 +08:00
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2019-06-13 01:52:48 +08:00
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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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- $4 - default install path (use root directory if blank)
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2009-07-21 03:37:11 +08:00
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2010-08-06 02:23:11 +08:00
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The implementation of "make install" is architecture specific
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2009-07-21 03:37:11 +08:00
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and it may differ from the above.
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INSTALLKERNEL is provided to enable the possibility to
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specify a custom installer when cross compiling a kernel.
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2008-12-29 20:45:52 +08:00
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MODLIB
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2019-06-13 01:52:48 +08:00
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------
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2008-12-29 20:45:52 +08:00
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Specify where to install modules.
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2019-06-13 01:52:48 +08:00
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The default value is::
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2008-12-29 20:45:52 +08:00
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$(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
|
2019-06-13 01:52:48 +08:00
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|
----------------
|
2008-12-29 20:45:52 +08:00
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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
|
2019-06-13 01:52:48 +08:00
|
|
|
-----------------
|
2008-12-29 20:45:52 +08:00
|
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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,
|
2011-01-09 15:59:49 +08:00
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|
INSTALL_MOD_STRIP value will be used as the options to the strip command.
|
2008-12-29 20:45:52 +08:00
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|
INSTALL_HDR_PATH
|
2019-06-13 01:52:48 +08:00
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|
|
----------------
|
2009-01-09 02:59:34 +08:00
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|
INSTALL_HDR_PATH specifies where to install user space headers when
|
2008-12-29 20:45:52 +08:00
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|
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executing "make headers_*".
|
2019-06-13 01:52:48 +08:00
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|
The default value is::
|
2008-12-29 20:45:52 +08:00
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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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|
|
2019-07-06 11:07:13 +08:00
|
|
|
KBUILD_ABS_SRCTREE
|
|
|
|
--------------------------------------------------
|
|
|
|
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
|
|
|
|
absolute path entries etc.
|
|
|
|
|
2015-07-21 04:16:28 +08:00
|
|
|
KBUILD_SIGN_PIN
|
2019-06-13 01:52:48 +08:00
|
|
|
---------------
|
2015-07-21 04:16:28 +08:00
|
|
|
This variable allows a passphrase or PIN to be passed to the sign-file
|
|
|
|
utility when signing kernel modules, if the private key requires such.
|
|
|
|
|
2008-12-29 20:45:52 +08:00
|
|
|
KBUILD_MODPOST_WARN
|
2019-06-13 01:52:48 +08:00
|
|
|
-------------------
|
2009-01-09 02:59:34 +08:00
|
|
|
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.
|
2008-12-29 20:45:52 +08:00
|
|
|
|
2009-01-09 02:59:34 +08:00
|
|
|
KBUILD_MODPOST_NOFINAL
|
2019-06-13 01:52:48 +08:00
|
|
|
----------------------
|
2008-12-29 20:45:52 +08:00
|
|
|
KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
|
2009-01-09 02:59:34 +08:00
|
|
|
This is solely useful to speed up test compiles.
|
2008-12-29 20:45:52 +08:00
|
|
|
|
|
|
|
KBUILD_EXTRA_SYMBOLS
|
2019-06-13 01:52:48 +08:00
|
|
|
--------------------
|
2009-01-09 02:59:34 +08:00
|
|
|
For modules that use symbols from other modules.
|
2020-03-12 06:50:44 +08:00
|
|
|
See more details in modules.rst.
|
2009-01-05 14:57:03 +08:00
|
|
|
|
|
|
|
ALLSOURCE_ARCHS
|
2019-06-13 01:52:48 +08:00
|
|
|
---------------
|
2009-01-09 02:59:34 +08:00
|
|
|
For tags/TAGS/cscope targets, you can specify more than one arch
|
2019-06-13 01:52:48 +08:00
|
|
|
to be included in the databases, separated by blank space. E.g.::
|
2009-01-05 14:57:03 +08:00
|
|
|
|
|
|
|
$ make ALLSOURCE_ARCHS="x86 mips arm" tags
|
2010-03-02 23:57:52 +08:00
|
|
|
|
2019-06-13 01:52:48 +08:00
|
|
|
To get all available archs you can also specify all. E.g.::
|
2010-03-02 23:57:52 +08:00
|
|
|
|
|
|
|
$ make ALLSOURCE_ARCHS=all tags
|
2011-03-01 16:35:29 +08:00
|
|
|
|
2011-04-05 20:32:30 +08:00
|
|
|
KBUILD_BUILD_TIMESTAMP
|
2019-06-13 01:52:48 +08:00
|
|
|
----------------------
|
2011-04-05 20:32:30 +08:00
|
|
|
Setting this to a date string overrides the timestamp used in the
|
2011-04-01 05:16:42 +08:00
|
|
|
UTS_VERSION definition (uname -v in the running kernel). The value has to
|
|
|
|
be a string that can be passed to date -d. The default value
|
2011-04-05 20:32:30 +08:00
|
|
|
is the output of the date command at one point during build.
|
|
|
|
|
|
|
|
KBUILD_BUILD_USER, KBUILD_BUILD_HOST
|
2019-06-13 01:52:48 +08:00
|
|
|
------------------------------------
|
2011-04-05 20:32:30 +08:00
|
|
|
These two variables allow to override the user@host string displayed during
|
|
|
|
boot and in /proc/version. The default value is the output of the commands
|
|
|
|
whoami and host, respectively.
|
2020-04-08 09:36:23 +08:00
|
|
|
|
|
|
|
LLVM
|
|
|
|
----
|
|
|
|
If this variable is set to 1, Kbuild will use Clang and LLVM utilities instead
|
|
|
|
of GCC and GNU binutils to build the kernel.
|