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 --- post/lib_powerpc/fpu/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'post') diff --git a/post/lib_powerpc/fpu/Makefile b/post/lib_powerpc/fpu/Makefile index a7aa5bcb7e..c720a26f61 100644 --- a/post/lib_powerpc/fpu/Makefile +++ b/post/lib_powerpc/fpu/Makefile @@ -18,7 +18,7 @@ obj-y += darwin-ldouble.o CFLAGS := $(shell echo $(CFLAGS) | sed s/-msoft-float//) CFLAGS += -mhard-float -fkeep-inline-functions -$(addprefix $(obj),$(obj-y)): $(obj)%.o: %.c +$(addprefix $(obj)/,$(obj-y)): $(obj)/%.o: $(src)/%.c $(CC) $(ALL_CFLAGS) -o $@.fp $< -c $(OBJCOPY) -R .gnu.attributes $@.fp $@ rm -f $@.fp -- cgit