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https://github.com/brain-hackers/u-boot-brain
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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>
20 lines
588 B
Makefile
20 lines
588 B
Makefile
#
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# (C) Copyright 2000-2002
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# (C) Copyright 2011
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# Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
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# Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
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#
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# SPDX-License-Identifier: GPL-2.0+
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CROSS_COMPILE ?= nds32le-linux-
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CONFIG_STANDALONE_LOAD_ADDR = 0x300000 -T $(srctree)/$(src)/nds32.lds
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PLATFORM_RELFLAGS += -fno-strict-aliasing -fno-common -mrelax
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PLATFORM_RELFLAGS += -gdwarf-2
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PLATFORM_CPPFLAGS += -DCONFIG_NDS32 -D__nds32__ -G0 -ffixed-10 -fpie
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LDFLAGS_u-boot = --gc-sections --relax
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