mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
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 $(obj)=<sub-dir>" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Tested-by: Gerhard Sittig <gsi@denx.de>
42 lines
1.1 KiB
Makefile
42 lines
1.1 KiB
Makefile
#
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# U-boot - Makefile
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#
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# Copyright (c) 2005-2008 Analog Device Inc.
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#
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# (C) Copyright 2000-2006
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# Licensed under the GPL-2 or later.
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#
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extra-y := init.elf
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extra-y += initcode.o
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extra-y += start.o
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obj-y := interrupt.o cache.o
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obj-y += cpu.o
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obj-y += gpio.o
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obj-y += interrupts.o
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obj-$(CONFIG_JTAG_CONSOLE) += jtag-console.o
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obj-y += os_log.o
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obj-y += reset.o
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obj-y += traps.o
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extra-y += check_initcode
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# make sure our initcode (which goes into LDR) does not
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# have relocs or external references
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$(obj)/initcode.o: CFLAGS += -fno-function-sections -fno-data-sections
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READINIT = env LC_ALL=C $(CROSS_COMPILE)readelf -s $<
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$(obj)/check_initcode: $(obj)/initcode.o
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ifneq ($(CONFIG_BFIN_BOOT_MODE),BFIN_BOOT_BYPASS)
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@if $(READINIT) | grep '\<GLOBAL\>.*\<UND\>' ; then \
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echo "$< contains external references!" 1>&2 ; \
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exit 1 ; \
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fi
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endif
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$(obj)/init.lds: $(src)/init.lds.S
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$(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P $^ -o $@
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$(obj)/init.elf: $(obj)/init.lds $(obj)/init.o $(obj)/initcode.o
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$(LD) $(LDFLAGS) -T $^ -o $@
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