提交 84336466 编写于 作者: R Roland McGrath 提交者: Michal Marek

kconfig CROSS_COMPILE option

This adds CROSS_COMPILE as a kconfig string so you can store it in
.config.  Then you can use plain "make" in the configured kernel build
directory to do the right cross compilation without setting the
command-line or environment variable every time.

With this, you can set up different build directories for different kernel
configurations, whether native or cross-builds, and then use the simple:

	make -C /build/dir M=module-source-dir

idiom to build modules for any given target kernel, indicating which one
by nothing but the build directory chosen.

I tried a version that defaults the string with env="CROSS_COMPILE" so
that in a "make oldconfig" with CROSS_COMPILE in the environment you can
just hit return to store the way you're building it.  But the kconfig
prompt for strings doesn't give you any way to say you want an empty
string instead of the default, so I punted that.
Signed-off-by: NRoland McGrath <roland@redhat.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Anibal Monsalve Salazar <anibal@debian.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NMichal Marek <mmarek@suse.cz>
上级 4b024242
...@@ -183,11 +183,14 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \ ...@@ -183,11 +183,14 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
# CROSS_COMPILE can be set on the command line # CROSS_COMPILE can be set on the command line
# make CROSS_COMPILE=ia64-linux- # make CROSS_COMPILE=ia64-linux-
# Alternatively CROSS_COMPILE can be set in the environment. # Alternatively CROSS_COMPILE can be set in the environment.
# A third alternative is to store a setting in .config so that plain
# "make" in the configured kernel build directory always uses that.
# Default value for CROSS_COMPILE is not to prefix executables # Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
export KBUILD_BUILDHOST := $(SUBARCH) export KBUILD_BUILDHOST := $(SUBARCH)
ARCH ?= $(SUBARCH) ARCH ?= $(SUBARCH)
CROSS_COMPILE ?= CROSS_COMPILE ?=
CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
# Architecture as present in compile.h # Architecture as present in compile.h
UTS_MACHINE := $(ARCH) UTS_MACHINE := $(ARCH)
......
...@@ -76,6 +76,14 @@ config INIT_ENV_ARG_LIMIT ...@@ -76,6 +76,14 @@ config INIT_ENV_ARG_LIMIT
variables passed to init from the kernel command line. variables passed to init from the kernel command line.
config CROSS_COMPILE
string "Cross-compiler tool prefix"
help
Same as running 'make CROSS_COMPILE=prefix-' but stored for
default make runs in this kernel build directory. You don't
need to set this unless you want the configured kernel build
directory to select the cross-compiler automatically.
config LOCALVERSION config LOCALVERSION
string "Local version - append to kernel release" string "Local version - append to kernel release"
help help
......
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