From 9e4140329ee9a787d0f96ac2829d618d47f7973f Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Tue, 4 Feb 2014 17:24:24 +0900 Subject: kbuild: change out-of-tree build This commit changes the working directory where the build process occurs. Before this commit, build process occurred under the source tree for both in-tree and out-of-tree build. That's why we needed to add $(obj) prefix to all generated files in makefiles like follows: $(obj)u-boot.bin: $(obj)u-boot Here, $(obj) is empty for in-tree build, whereas it points to the output directory for out-of-tree build. And our old build system changes the current working directory with "make -C " syntax when descending into the sub-directories. On the other hand, Kbuild uses a different idea to handle out-of-tree build and directory descending. The build process of Kbuild always occurs under the output tree. When "O=dir/to/store/output/files" is given, the build system changes the current working directory to that directory and restarts the make. Kbuild uses "make -f $(srctree)/scripts/Makefile.build obj=" syntax for descending into sub-directories. (We can write it like "make $(obj)=" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada Tested-by: Gerhard Sittig --- arch/nds32/config.mk | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/nds32') diff --git a/arch/nds32/config.mk b/arch/nds32/config.mk index e93e3a8..550f8a4 100644 --- a/arch/nds32/config.mk +++ b/arch/nds32/config.mk @@ -10,7 +10,7 @@ CROSS_COMPILE ?= nds32le-linux- -CONFIG_STANDALONE_LOAD_ADDR = 0x300000 -T nds32.lds +CONFIG_STANDALONE_LOAD_ADDR = 0x300000 -T $(srctree)/$(src)/nds32.lds PLATFORM_RELFLAGS += -fno-strict-aliasing -fno-common -mrelax PLATFORM_RELFLAGS += -gdwarf-2 -- cgit v1.1 From 7c8278a866122ef6c1201b94cd602f98cc649a2f Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Tue, 4 Feb 2014 17:24:25 +0900 Subject: kbuild: add dummy obj-y to create built-in.o We are going to switch over to Kbuild in upcoming commits. Each makefile must have non-empty obj- or obj-y to generate built-in.o on Kbuild. Signed-off-by: Masahiro Yamada --- arch/nds32/cpu/n1213/Makefile | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/nds32') diff --git a/arch/nds32/cpu/n1213/Makefile b/arch/nds32/cpu/n1213/Makefile index bb3550e..206d304 100644 --- a/arch/nds32/cpu/n1213/Makefile +++ b/arch/nds32/cpu/n1213/Makefile @@ -9,4 +9,7 @@ # SPDX-License-Identifier: GPL-2.0+ # +# necessary to create built-in.o +obj- := __dummy__.o + extra-y = start.o -- cgit v1.1