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kbuild: change out-of-tree build

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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/Makefile.build 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 <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>
This commit is contained in:
Masahiro Yamada
2014-02-04 17:24:24 +09:00
committed by Tom Rini
parent d958002589
commit 9e4140329e
64 changed files with 611 additions and 743 deletions
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14
examples/standalone/Makefile
View File

@@ -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