path: root/examples/standalone
diff options
authorMasahiro Yamada <>2014-02-04 17:24:24 +0900
committerTom Rini <>2014-02-19 11:07:50 -0500
commit9e4140329ee9a787d0f96ac2829d618d47f7973f (patch)
tree6a40432f6f6723ba9ac5309076af17aec3bc0a9b /examples/standalone
parentd958002589cb724907e8d4360d546403d1e6b7d8 (diff)
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 <sub-dir>" 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/ obj=<sub-dir>" syntax for descending into sub-directories. (We can write it like "make $(obj)=<sub-dir>" 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 <>
Diffstat (limited to 'examples/standalone')
1 files changed, 7 insertions, 7 deletions
diff --git a/examples/standalone/Makefile b/examples/standalone/Makefile
index 1f8d70ce8a..a6819f7792 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, $(LIBOBJS))
-$(obj)%: $(obj)%.o $(LIB)
+$(obj)/%: $(obj)/%.o $(LIB)
-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
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