Copy from Linux Kernel (with a few adjustments in comments).
Signed-off-by: Masahiro Yamada yamada.m@jp.panasonic.com ---
Kconfig | 9 +++++++++ Makefile | 20 ++++++++++++++------ 2 files changed, 23 insertions(+), 6 deletions(-)
diff --git a/Kconfig b/Kconfig index 4e383d2..1bf488e 100644 --- a/Kconfig +++ b/Kconfig @@ -41,6 +41,15 @@ config TPL prompt "Build TPL image" if !SPL_BUILD default y if TPL_BUILD
+config CROSS_COMPILE + string "Cross-compiler tool prefix" + depends on !SPL_BUILD + help + Same as running 'make CROSS_COMPILE=prefix-' but stored for + default make runs in this U-Boot build directory. You don't + need to set this unless you want the configured U-Boot build + directory to select the cross-compiler automatically. + endmenu # General setup
source "arch/Kconfig" diff --git a/Makefile b/Makefile index 8953922..440defd 100644 --- a/Makefile +++ b/Makefile @@ -188,12 +188,20 @@ HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' | \
export HOSTARCH HOSTOS
-######################################################################### - -# set default to nothing for native builds -ifeq ($(HOSTARCH),$(ARCH)) -CROSS_COMPILE ?= -endif +# Cross compiling and selecting different set of gcc/bin-utils +# --------------------------------------------------------------------------- +# +# CROSS_COMPILE specify the prefix used for all executables used +# during compilation. Only gcc and related bin-utils executables +# are prefixed with $(CROSS_COMPILE). +# CROSS_COMPILE can be set on the command line +# make CROSS_COMPILE=ia64-linux- +# 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 +# Note: Some architectures assign CROSS_COMPILE in their arch/*/config.mk +CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
KCONFIG_CONFIG ?= .config export KCONFIG_CONFIG