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https://github.com/Fishwaldo/u-boot.git
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9e4140329e
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 $(obj)=<sub-dir>" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Tested-by: Gerhard Sittig <gsi@denx.de>
62 lines
1.9 KiB
Makefile
62 lines
1.9 KiB
Makefile
#
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# (C) Copyright 2007 Semihalf
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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ifdef FTRACE
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CFLAGS += -finstrument-functions -DFTRACE
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endif
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ifeq ($(ARCH),powerpc)
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LOAD_ADDR = 0x40000
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endif
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ifeq ($(ARCH),arm)
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LOAD_ADDR = 0x1000000
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endif
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# Resulting ELF and binary exectuables will be named demo and demo.bin
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extra-y = demo
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# Source files located in the examples/api directory
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SOBJ_FILES-y += crt0.o
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COBJ_FILES-y += demo.o
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COBJ_FILES-y += glue.o
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COBJ_FILES-y += libgenwrap.o
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# Source files which exist outside the examples/api directory
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EXT_COBJ_FILES-y += lib/crc32.o
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EXT_COBJ_FILES-y += lib/ctype.o
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EXT_COBJ_FILES-y += lib/div64.o
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EXT_COBJ_FILES-y += lib/string.o
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EXT_COBJ_FILES-y += lib/time.o
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EXT_COBJ_FILES-y += lib/vsprintf.o
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EXT_SOBJ_FILES-$(CONFIG_PPC) += arch/powerpc/lib/ppcstring.o
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# Create a list of source files so their dependencies can be auto-generated
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SRCS += $(addprefix $(SRCTREE)/,$(EXT_COBJ_FILES-y:.o=.c))
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SRCS += $(addprefix $(SRCTREE)/,$(EXT_SOBJ_FILES-y:.o=.S))
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SRCS += $(addprefix $(SRCTREE)/examples/api/,$(COBJ_FILES-y:.o=.c))
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SRCS += $(addprefix $(SRCTREE)/examples/api/,$(SOBJ_FILES-y:.o=.S))
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# Create a list of object files to be compiled
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OBJS += $(addprefix $(obj)/,$(SOBJ_FILES-y))
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OBJS += $(addprefix $(obj)/,$(COBJ_FILES-y))
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OBJS += $(addprefix $(obj)/,$(notdir $(EXT_COBJ_FILES-y)))
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OBJS += $(addprefix $(obj)/,$(notdir $(EXT_SOBJ_FILES-y)))
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#########################################################################
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$(obj)/demo: $(OBJS)
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$(LD) --gc-sections -Ttext $(LOAD_ADDR) -o $@ $^ $(PLATFORM_LIBS)
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$(obj)/demo.bin: $(obj)/demo
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$(OBJCOPY) -O binary $< $@ 2>/dev/null
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# Rule to build generic library C files
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$(addprefix $(obj)/,$(notdir $(EXT_COBJ_FILES-y))): $(obj)/%.o: $(SRCTREE)/lib/%.c
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$(CC) -g $(CFLAGS) -c -o $@ $<
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# Rule to build architecture-specific library assembly files
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$(addprefix $(obj)/,$(notdir $(EXT_SOBJ_FILES-y))): $(obj)/%.o: $(SRCTREE)/arch/$(ARCH)/lib/%.S
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$(CC) -g $(CFLAGS) -c -o $@ $<
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