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 $(obj)=" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada Tested-by: Gerhard Sittig --- board/cray/L1/Makefile | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'board/cray') diff --git a/board/cray/L1/Makefile b/board/cray/L1/Makefile index 5f6c690b7c..6aae9fa62f 100644 --- a/board/cray/L1/Makefile +++ b/board/cray/L1/Makefile @@ -9,8 +9,8 @@ obj-y = L1.o flash.o obj-y += init.o obj-y += bootscript.o -$(obj)bootscript.c: $(obj)bootscript.image - od -t x1 -v -A x $^ | awk -f x2c.awk > $@ +$(obj)/bootscript.c: $(obj)/bootscript.image + od -t x1 -v -A x $^ | awk -f $(srctree)/$(src)/x2c.awk > $@ -$(obj)bootscript.image: $(src)bootscript.hush $(src)Makefile - -$(OBJTREE)/tools/mkimage -A ppc -O linux -T script -C none -a 0 -e 0 -n bootscript -d $(src)bootscript.hush $@ +$(obj)/bootscript.image: $(src)/bootscript.hush + -$(OBJTREE)/tools/mkimage -A ppc -O linux -T script -C none -a 0 -e 0 -n bootscript -d $< $@ -- cgit