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https://github.com/brain-hackers/u-boot-brain
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026f9cf24f
Kbuild brought about many advantages for us but a significant
performance regression was reported by Simon Glass.
After some discussions and analysis, it turned out
its main cause is in $(call cc-option,...).
Historically, U-Boot parses all config.mk
(arch/*/config.mk and board/*/config.mk)
every time descending into subdirectories.
That means cc-options are evaluated over and over again.
$(call cc-option,...) is useful but costly.
So we want to evaluate them only in ./Makefile
and spl/Makefile and export compiler flags.
This commit changes the build system as follows:
- Modify scripts/Makefile.build to not include config.mk
Instead, add $(PLATFORM_CPPFLAGS) to asflags-y, ccflags-y,
cppflags-y.
- Export many variables
Going forward, Kbuild will not parse config.mk files
when it descends into subdirectories.
If we want to set variables in config.mk and use them
in subdirectories, they must be exported.
This is the list of variables to get exported:
PLATFORM_CPPFLAGS
CPUDIR
BOARDDIR
OBJCOPYFLAGS
LDFLAGS
LDFLAGS_FINAL
(used in nand_spl/board/*/*/Makefile)
CONFIG_STANDALONE_LOAD_ADDR
(used in examples/standalone/Makefile)
SYM_PREFIX
(used in examples/standalone/Makefile)
RELFLAGS
(used in examples/standalone/Makefile)
- Delete CPPFLAGS
This variable has been replaced with PLATFORM_CPPFLAGS
- Copy gcclibdir from example/standalone/Makefile
to arch/sparc/config.mk
The reference in CONFIG_STANDALONE_LOAD_ADDR must be
resolved before it is exported.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Reported-by: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org> [on Sandbox]
Tested-by: Stephen Warren <swarren@nvidia.com> [on Tegra]
78 lines
2.5 KiB
Makefile
78 lines
2.5 KiB
Makefile
#
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# (C) Copyright 2000-2006
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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extra-y := hello_world
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extra-$(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 = $(obj)/libstubs.o
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LIBOBJS-$(CONFIG_PPC) += ppc_longjmp.o ppc_setjmp.o
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LIBOBJS-$(CONFIG_8xx) += test_burst_lib.o
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LIBOBJS-y += stubs.o
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.SECONDARY: $(call objectify,$(COBJS))
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targets += $(patsubst $(obj)/%,%,$(LIB)) $(COBJS) $(LIBOBJS-y)
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LIBOBJS := $(addprefix $(obj)/,$(LIBOBJS-y))
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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 ($(CONFIG_PPC),y)
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PLATFORM_CPPFLAGS := $(filter-out $(RELFLAGS),$(PLATFORM_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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ccflags-y += $(call cc-option,-fno-toplevel-reorder)
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#########################################################################
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quiet_cmd_link_lib = LD $@
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cmd_link_lib = $(LD) $(ld_flags) -r -o $@ $(filter $(LIBOBJS), $^)
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$(LIB): $(LIBOBJS) FORCE
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$(call if_changed,link_lib)
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quiet_cmd_link_elf = LD $@
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cmd_link_elf = $(LD) $(LDFLAGS) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \
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-o $@ -e $(SYM_PREFIX)$(@F) $< $(LIB) -L$(gcclibdir) -lgcc
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$(ELF): $(obj)/%: $(obj)/%.o $(LIB) FORCE
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$(call if_changed,link_elf)
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$(obj)/%.srec: OBJCOPYFLAGS := -O srec
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$(obj)/%.srec: $(obj)/% FORCE
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$(call if_changed,objcopy)
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$(obj)/%.bin: OBJCOPYFLAGS := -O binary
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$(obj)/%.bin: $(obj)/% FORCE
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$(call if_changed,objcopy)
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