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 --- examples/standalone/Makefile | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'examples/standalone') diff --git a/examples/standalone/Makefile b/examples/standalone/Makefile index 1f8d70c..a6819f7 100644 --- a/examples/standalone/Makefile +++ b/examples/standalone/Makefile @@ -31,7 +31,7 @@ clean-files := $(extra-) $(addsuffix .srec,$(extra-)) $(addsuffix .bin,$(extra- COBJS := $(ELF:=.o) -LIB = $(obj)libstubs.o +LIB = $(obj)/libstubs.o LIBAOBJS-$(CONFIG_PPC) += ppc_longjmp.o ppc_setjmp.o LIBAOBJS-$(CONFIG_8xx) += test_burst_lib.o @@ -39,11 +39,11 @@ LIBAOBJS := $(LIBAOBJS-y) LIBCOBJS = stubs.o -LIBOBJS = $(addprefix $(obj),$(LIBAOBJS) $(LIBCOBJS)) +LIBOBJS = $(addprefix $(obj)/,$(LIBAOBJS) $(LIBCOBJS)) SRCS := $(COBJS:.o=.c) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S) -OBJS := $(addprefix $(obj),$(COBJS)) -ELF := $(addprefix $(obj),$(ELF)) +OBJS := $(addprefix $(obj)/,$(COBJS)) +ELF := $(addprefix $(obj)/,$(ELF)) gcclibdir := $(shell dirname `$(CC) -print-libgcc-file-name`) @@ -67,13 +67,13 @@ $(LIB): $(LIBOBJS) $(call cmd_link_o_target, $(LIBOBJS)) $(ELF): -$(obj)%: $(obj)%.o $(LIB) +$(obj)/%: $(obj)/%.o $(LIB) $(LD) $(LDFLAGS) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \ -o $@ -e $(SYM_PREFIX)$(notdir $(<:.o=)) $< $(LIB) \ -L$(gcclibdir) -lgcc -$(obj)%.srec: $(obj)% +$(obj)/%.srec: $(obj)/% $(OBJCOPY) -O srec $< $@ 2>/dev/null -$(obj)%.bin: $(obj)% +$(obj)/%.bin: $(obj)/% $(OBJCOPY) -O binary $< $@ 2>/dev/null -- cgit v1.1