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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>
83 lines
2.6 KiB
Makefile
83 lines
2.6 KiB
Makefile
#
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# (C) Copyright 2000-2002
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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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CROSS_COMPILE ?= arm-linux-
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ifndef CONFIG_STANDALONE_LOAD_ADDR
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ifeq ($(SOC),omap3)
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CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
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else
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CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
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endif
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endif
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PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__
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# Explicitly specifiy 32-bit ARM ISA since toolchain default can be -mthumb:
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PF_CPPFLAGS_ARM := $(call cc-option,-marm,)
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# Try if EABI is supported, else fall back to old API,
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# i. e. for example:
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# - with ELDK 4.2 (EABI supported), use:
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# -mabi=aapcs-linux -mno-thumb-interwork
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# - with ELDK 4.1 (gcc 4.x, no EABI), use:
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# -mabi=apcs-gnu -mno-thumb-interwork
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# - with ELDK 3.1 (gcc 3.x), use:
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# -mapcs-32 -mno-thumb-interwork
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PF_CPPFLAGS_ABI := $(call cc-option,\
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-mabi=aapcs-linux -mno-thumb-interwork,\
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$(call cc-option,\
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-mapcs-32,\
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$(call cc-option,\
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-mabi=apcs-gnu,\
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)\
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) $(call cc-option,-mno-thumb-interwork,)\
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)
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PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
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# For EABI, make sure to provide raise()
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ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
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# This file is parsed many times, so the string may get added multiple
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# times. Also, the prefix needs to be different based on whether
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# CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
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# before adding the correct one.
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ifdef CONFIG_SPL_BUILD
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PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \
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$(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
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else
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PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \
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$(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
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endif
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endif
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ifdef CONFIG_SYS_LDSCRIPT
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# need to strip off double quotes
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LDSCRIPT := $(subst ",,$(CONFIG_SYS_LDSCRIPT))
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else
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LDSCRIPT := $(SRCTREE)/$(CPUDIR)/u-boot.lds
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endif
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# needed for relocation
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ifndef CONFIG_NAND_SPL
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LDFLAGS_u-boot += -pie
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endif
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