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https://github.com/AsahiLinux/u-boot
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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>
55 lines
1.7 KiB
Makefile
55 lines
1.7 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 $(TOPDIR)/config.mk
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ifneq ($(OBJTREE),$(SRCTREE))
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$(shell mkdir -p $(obj)drivers/epic $(obj)drivers/i2c)
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endif
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LIB = $(obj)lib$(CPU).o
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START = start.o
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COBJS = traps.o cpu.o cpu_init.o interrupts.o speed.o \
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drivers/epic/epic1.o drivers/i2c/i2c.o pci.o
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COBJS_LN = bedbug_603e.o
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SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c) $(addprefix $(obj),$(COBJS_LN:.o=.c))
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OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS) $(COBJS_LN))
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START := $(addprefix $(obj),$(START))
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all: $(obj).depend $(START) $(LIB)
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$(LIB): $(OBJS)
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$(call cmd_link_o_target, $(OBJS))
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$(obj)bedbug_603e.c:
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ln -sf $(src)../mpc8260/bedbug_603e.c $(obj)bedbug_603e.c
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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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