kbuild: add "cross_tools" target to build tools for the target
Programs in tools/ directory are usually built for the host.
But some of them (mkimage, dumpimge, gen_eth_addr, etc.) are
useful on the target OS too.
Actually, prior to Kbuild, U-Boot could build tools for
the target like follows:
$ make <target_board>_config
$ export CROSS_COMPILE=<cross_gcc_prefix>
$ make HOSTCC=${CROSS_COMPILE}gcc HOSTSTRIP=${CROSS_COMPILE}strip tools
In Kbuild, we can no longer replace HOSTCC at the command line.
In order to get back that feature, this commit adds "cross-tools" target.
Usage:
Build tools for the host
$ make CROSS_COMPILE=<cross_gcc_prefix> tools
Build tools for the target
$ make CROSS_COMPILE=<cross_gcc_prefix> cross_tools
Besides, "make cross_tools" strip tools programs because we
generally expect smaller storages on embedded systems.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Reported-by: Heiko Schocher <hs@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Tom Rini <trini@ti.com>
Tested-by: Heiko Schocher <hs@denx.de>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/tools/Makefile b/tools/Makefile
index dcd49f8..8fccc65 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -191,3 +191,15 @@
# Let clean descend into subdirs
subdir- += env
+
+ifneq ($(CROSS_BUILD_TOOLS),)
+HOSTCC = $(CC)
+
+quiet_cmd_crosstools_strip = STRIP $^
+ cmd_crosstools_strip = $(STRIP) $^; touch $@
+$(obj)/.strip: $(call objectify,$(filter $(always),$(hostprogs-y)))
+ $(call cmd,crosstools_strip)
+
+always += .strip
+endif
+clean-files += .strip