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https://github.com/brain-hackers/u-boot-brain
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cca4e4aec1
U-Boot Makefiles contain a number of tests for compiler features etc. which so far are executed again and again. On some architectures (especially ARM) this results in a large number of calls to gcc. This patch makes sure to run such tests only once, thus largely reducing the number of "execve" system calls. Example: number of "execve" system calls for building the "P2020DS" (Power Architecture) and "qong" (ARM) boards, measured as: -> strace -f -e trace=execve -o /tmp/foo ./MAKEALL <board> -> grep execve /tmp/foo | wc -l Before: After: Reduction: ================================== P2020DS 20555 15205 -26% qong 31692 14490 -54% As a result, built times are significantly reduced, typically by 30...50%. Signed-off-by: Wolfgang Denk <wd@denx.de> Cc: Andy Fleming <afleming@gmail.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Albert Aribaud <albert.aribaud@free.fr> cc: Graeme Russ <graeme.russ@gmail.com> cc: Mike Frysinger <vapier@gentoo.org> Tested-by: Graeme Russ <graeme.russ@gmail.com> Tested-by: Matthias Weisser <weisserm@arcor.de> Tested-by: Sanjeev Premi <premi@ti.com> Tested-by: Simon Glass <sjg@chromium.org> Tested-by: Macpaul Lin <macpaul@gmail.com> Acked-by: Mike Frysinger <vapier@gentoo.org>
119 lines
3.7 KiB
Makefile
119 lines
3.7 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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# See file CREDITS for list of people who contributed to this
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# project.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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#
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include $(TOPDIR)/config.mk
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ELF-$(ARCH) :=
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ELF-$(BOARD) :=
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ELF-$(CPU) :=
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ELF-y := hello_world
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ELF-$(CONFIG_SMC91111) += smc91111_eeprom
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ELF-$(CONFIG_SMC911X) += smc911x_eeprom
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ELF-$(CONFIG_SPI_FLASH_ATMEL) += atmel_df_pow2
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ELF-i386 += 82559_eeprom
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ELF-mpc5xxx += interrupt
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ELF-mpc8xx += test_burst timer
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ELF-mpc8260 += mem_to_mem_idma2intr
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ELF-ppc += sched
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ELF-oxc += eepro100_eeprom
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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 $(ELF-y) $(ELF-$(ARCH)) $(ELF-$(BOARD)) $(ELF-$(CPU)))
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SREC := $(addsuffix .srec,$(ELF))
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BIN := $(addsuffix .bin,$(ELF))
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COBJS := $(ELF:=.o)
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LIB = $(obj)libstubs.o
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LIBAOBJS-$(ARCH) :=
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LIBAOBJS-$(CPU) :=
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LIBAOBJS-ppc += $(ARCH)_longjmp.o $(ARCH)_setjmp.o
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LIBAOBJS-mpc8xx += test_burst_lib.o
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LIBAOBJS := $(LIBAOBJS-$(ARCH)) $(LIBAOBJS-$(CPU))
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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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BIN := $(addprefix $(obj),$(BIN))
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SREC := $(addprefix $(obj),$(SREC))
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gcclibdir := $(shell dirname `$(CC) -print-libgcc-file-name`)
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CPPFLAGS += -I..
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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_NTR := $(call cc-option,-fno-toplevel-reorder)
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CFLAGS += $(CFLAGS_NTR)
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all: $(obj).depend $(OBJS) $(LIB) $(SREC) $(BIN) $(ELF)
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#########################################################################
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$(LIB): $(obj).depend $(LIBOBJS)
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$(call cmd_link_o_target, $(LIBOBJS))
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$(ELF):
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$(obj)%: $(obj)%.o $(LIB)
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$(LD) -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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$(SREC):
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$(obj)%.srec: $(obj)%
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$(OBJCOPY) -O srec $< $@ 2>/dev/null
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$(BIN):
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$(obj)%.bin: $(obj)%
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$(OBJCOPY) -O binary $< $@ 2>/dev/null
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#########################################################################
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# defines $(obj).depend target
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include $(SRCTREE)/rules.mk
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sinclude $(obj).depend
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#########################################################################
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