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 $(obj)=<sub-dir>" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Tested-by: Gerhard Sittig <gsi@denx.de>
76 lines
2 KiB
Makefile
76 lines
2 KiB
Makefile
#
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# (C) Copyright 2000-2013
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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#########################################################################
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# clean the slate ...
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PLATFORM_RELFLAGS =
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PLATFORM_CPPFLAGS =
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PLATFORM_LDFLAGS =
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#########################################################################
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# Load generated board configuration
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ifeq ($(CONFIG_TPL_BUILD),y)
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# Include TPL autoconf
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sinclude include/tpl-autoconf.mk
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else
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ifeq ($(CONFIG_SPL_BUILD),y)
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# Include SPL autoconf
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sinclude include/spl-autoconf.mk
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else
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# Include normal autoconf
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sinclude include/autoconf.mk
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endif
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endif
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sinclude $(OBJTREE)/include/config.mk
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# Some architecture config.mk files need to know what CPUDIR is set to,
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# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
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# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
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# CPU-specific code.
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CPUDIR=arch/$(ARCH)/cpu/$(CPU)
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ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
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CPUDIR=arch/$(ARCH)/cpu
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endif
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sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules
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sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules
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ifdef SOC
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sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules
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endif
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ifdef VENDOR
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BOARDDIR = $(VENDOR)/$(BOARD)
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else
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BOARDDIR = $(BOARD)
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endif
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ifdef BOARD
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sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules
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endif
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#########################################################################
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RELFLAGS= $(PLATFORM_RELFLAGS)
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OBJCFLAGS += --gap-fill=0xff
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CPPFLAGS = $(KBUILD_CPPFLAGS) $(RELFLAGS)
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CPPFLAGS += $(UBOOTINCLUDE)
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CPPFLAGS += $(NOSTDINC_FLAGS) -pipe $(PLATFORM_CPPFLAGS)
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CFLAGS := $(KBUILD_CFLAGS) $(CPPFLAGS)
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BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
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AFLAGS := $(KBUILD_AFLAGS) $(CPPFLAGS)
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LDFLAGS += $(PLATFORM_LDFLAGS)
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LDFLAGS_FINAL += -Bstatic
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#########################################################################
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export PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
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