lkml.org 
[lkml]   [2014]   [Sep]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH v2 4/4] kconfig: link CONFIG_CROSS_COMPILE with environment variable
From
Date
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 <koct9i@gmail.com>
---
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


\
 
 \ /
  Last update: 2014-09-01 09:41    [W:0.112 / U:0.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site