Cross-compiler tool prefix can be set in command line, in the environment variable CROSS_COMPILE or in config file, in option CONFIG_COROSS_COMPILE. Also some arch/*/Makefile provides default value.
This patch links config option CONFIG_CROSS_COMPILE and variable CROSS_COMPILE in both directions: environment/command line has higher priority and updates value saved in the config file, config option acts as default value for it. This is especially useful together with option O=dir which allows to create separate directory for each target architecture and kernel flavor: # make O=build/arm ARCH=arm CROSS_COMPILE=arm-none-eabi- defconfig # make -C build/arm Signed-off-by: Konstantin Khlebnikov <[email protected]> --- Makefile | 6 +++++- init/Kconfig | 1 + 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index f648405..1044f40 100644 --- a/Makefile +++ b/Makefile @@ -263,7 +263,11 @@ endif # "make" in the configured kernel build directory always uses that. # Default value for CROSS_COMPILE is not to prefix executables # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile -CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) +ifndef CROSS_COMPILE + CROSS_COMPILE := $(shell $(srctree)/scripts/config \ + --file $(KBUILD_OUTPUT)$(KCONFIG_CONFIG) \ + --if-undef "" --state "CROSS_COMPILE") +endif # Architecture as present in compile.h UTS_MACHINE := $(ARCH) diff --git a/init/Kconfig b/init/Kconfig index e84c642..1c2f621 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -47,6 +47,7 @@ config INIT_ENV_ARG_LIMIT config CROSS_COMPILE string "Cross-compiler tool prefix" + option env="CROSS_COMPILE" help Same as running 'make CROSS_COMPILE=prefix-' but stored for default make runs in this kernel build directory. You don't -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
