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kbuild: remove CONFIG_CROSS_COMPILE support

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Kbuild provides a couple of ways to specify CROSS_COMPILE:

[1] Command line
[2] Environment
[3] arch/*/Makefile (only some architectures)
[4] CONFIG_CROSS_COMPILE

[4] is problematic for the compiler capability tests in Kconfig.
CONFIG_CROSS_COMPILE allows users to change the compiler prefix from
'make menuconfig', etc.  It means, the compiler options would have
to be all re-calculated everytime CONFIG_CROSS_COMPILE is changed.

To avoid complexity and performance issues, I'd like to evaluate
the shell commands statically, i.e. only parsing Kconfig files.

I guess the majority is [1] or [2].  Currently, there are only
5 defconfig files that specify CONFIG_CROSS_COMPILE.
  arch/arm/configs/lpc18xx_defconfig
  arch/hexagon/configs/comet_defconfig
  arch/nds32/configs/defconfig
  arch/openrisc/configs/or1ksim_defconfig
  arch/openrisc/configs/simple_smp_defconfig

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Masahiro Yamada 2018-05-28 18:21:39 +09:00
parent e08d6de4e5
commit f1089c92da
2 changed files with 0 additions and 12 deletions
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3
Makefile
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@ -316,12 +316,9 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
# 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
ARCH ?= $(SUBARCH) ARCH ?= $(SUBARCH)
CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
# Architecture as present in compile.h # Architecture as present in compile.h
UTS_MACHINE := $(ARCH) UTS_MACHINE := $(ARCH)

9
init/Kconfig
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@ -54,15 +54,6 @@ config INIT_ENV_ARG_LIMIT
Maximum of each of the number of arguments and environment Maximum of each of the number of arguments and environment
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 COMPILE_TEST config COMPILE_TEST
bool "Compile also drivers which will not load" bool "Compile also drivers which will not load"
depends on !UML depends on !UML