mirror of
https://git.codelinaro.org/clo/qsdk/oss/boot/u-boot-2016.git
synced 2026-03-10 03:07:16 +01:00
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 $(obj)=<sub-dir>" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Tested-by: Gerhard Sittig <gsi@denx.de>
79 lines
2.4 KiB
Makefile
79 lines
2.4 KiB
Makefile
#
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# (C) Copyright 2000-2006
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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ifdef FTRACE
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CFLAGS += -finstrument-functions -DFTRACE
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endif
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extra-y := hello_world
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extra-$(CONFIG_SMC91111) += smc91111_eeprom
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extra-$(CONFIG_SMC911X) += smc911x_eeprom
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extra-$(CONFIG_SPI_FLASH_ATMEL) += atmel_df_pow2
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extra-$(CONFIG_MPC5xxx) += interrupt
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extra-$(CONFIG_8xx) += test_burst timer
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extra-$(CONFIG_8260) += mem_to_mem_idma2intr
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extra-$(CONFIG_PPC) += sched
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#
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# Some versions of make do not handle trailing white spaces properly;
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# leading to build failures. The problem was found with GNU Make 3.80.
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# Using 'strip' as a workaround for the problem.
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#
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ELF := $(strip $(extra-y))
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extra-y += $(addsuffix .srec,$(extra-y)) $(addsuffix .bin,$(extra-y))
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clean-files := $(extra-) $(addsuffix .srec,$(extra-)) $(addsuffix .bin,$(extra-))
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COBJS := $(ELF:=.o)
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LIB = $(obj)/libstubs.o
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LIBAOBJS-$(CONFIG_PPC) += ppc_longjmp.o ppc_setjmp.o
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LIBAOBJS-$(CONFIG_8xx) += test_burst_lib.o
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LIBAOBJS := $(LIBAOBJS-y)
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LIBCOBJS = stubs.o
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LIBOBJS = $(addprefix $(obj)/,$(LIBAOBJS) $(LIBCOBJS))
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SRCS := $(COBJS:.o=.c) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S)
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OBJS := $(addprefix $(obj)/,$(COBJS))
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ELF := $(addprefix $(obj)/,$(ELF))
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gcclibdir := $(shell dirname `$(CC) -print-libgcc-file-name`)
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# For PowerPC there's no need to compile standalone applications as a
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# relocatable executable. The relocation data is not needed, and
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# also causes the entry point of the standalone application to be
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# inconsistent.
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ifeq ($(ARCH),powerpc)
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AFLAGS := $(filter-out $(RELFLAGS),$(AFLAGS))
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CFLAGS := $(filter-out $(RELFLAGS),$(CFLAGS))
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CPPFLAGS := $(filter-out $(RELFLAGS),$(CPPFLAGS))
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endif
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# We don't want gcc reordering functions if possible. This ensures that an
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# application's entry point will be the first function in the application's
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# source file.
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CFLAGS += $(call cc-option,-fno-toplevel-reorder)
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#########################################################################
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$(LIB): $(LIBOBJS)
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$(call cmd_link_o_target, $(LIBOBJS))
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$(ELF):
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$(obj)/%: $(obj)/%.o $(LIB)
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$(LD) $(LDFLAGS) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \
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-o $@ -e $(SYM_PREFIX)$(notdir $(<:.o=)) $< $(LIB) \
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-L$(gcclibdir) -lgcc
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$(obj)/%.srec: $(obj)/%
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$(OBJCOPY) -O srec $< $@ 2>/dev/null
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$(obj)/%.bin: $(obj)/%
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$(OBJCOPY) -O binary $< $@ 2>/dev/null
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