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kernel/linux-imx6_3.14.28/arch/arc/Makefile 4.27 KB
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  #
  # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU General Public License version 2 as
  # published by the Free Software Foundation.
  #
  
  UTS_MACHINE := arc
  
  ifeq ($(CROSS_COMPILE),)
  CROSS_COMPILE := arc-linux-uclibc-
  endif
  
  KBUILD_DEFCONFIG := fpga_defconfig
  
  cflags-y	+= -mA7 -fno-common -pipe -fno-builtin -D__linux__
  
  ifdef CONFIG_ARC_CURR_IN_REG
  # For a global register defintion, make sure it gets passed to every file
  # We had a customer reported bug where some code built in kernel was NOT using
  # any kernel headers, and missing the r25 global register
  # Can't do unconditionally because of recursive include issues
  # due to <linux/thread_info.h>
  LINUXINCLUDE	+=  -include ${src}/arch/arc/include/asm/current.h
  endif
  
  upto_gcc42    :=  $(call cc-ifversion, -le, 0402, y)
  upto_gcc44    :=  $(call cc-ifversion, -le, 0404, y)
  atleast_gcc44 :=  $(call cc-ifversion, -ge, 0404, y)
  atleast_gcc48 :=  $(call cc-ifversion, -ge, 0408, y)
  
  cflags-$(atleast_gcc44)			+= -fsection-anchors
  
  cflags-$(CONFIG_ARC_HAS_LLSC)		+= -mlock
  cflags-$(CONFIG_ARC_HAS_SWAPE)		+= -mswape
  cflags-$(CONFIG_ARC_HAS_RTSC)		+= -mrtsc
  cflags-$(CONFIG_ARC_DW2_UNWIND)		+= -fasynchronous-unwind-tables
  
  # By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
  ifeq ($(atleast_gcc48),y)
  cflags-$(CONFIG_ARC_DW2_UNWIND)		+= -gdwarf-2
  endif
  
  ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
  # Generic build system uses -O2, we want -O3
  cflags-y  += -O3
  endif
  
  # small data is default for elf32 tool-chain. If not usable, disable it
  # This also allows repurposing GP as scratch reg to gcc reg allocator
  disable_small_data := y
  cflags-$(disable_small_data)		+= -mno-sdata -fcall-used-gp
  
  cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= -mbig-endian
  ldflags-$(CONFIG_CPU_BIG_ENDIAN)	+= -EB
  
  # STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
  # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
  # --build-id w/o "-marclinux". Default arc-elf32-ld is OK
  ldflags-$(upto_gcc44)			+= -marclinux
  
  ARC_LIBGCC				:= -mA7
  cflags-$(CONFIG_ARC_HAS_HW_MPY)		+= -multcost=16
  
  ifndef CONFIG_ARC_HAS_HW_MPY
  	cflags-y	+= -mno-mpy
  
  # newlib for ARC700 assumes MPY to be always present, which is generally true
  # However, if someone really doesn't want MPY, we need to use the 600 ver
  # which coupled with -mno-mpy will use mpy emulation
  # With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
  # e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
  
  	ifeq ($(upto_gcc42),y)
  		ARC_LIBGCC	:= -marc600
  		cflags-y	+= -multcost=30
  	endif
  endif
  
  LIBGCC	:= $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name)
  
  # Modules with short calls might break for calls into builtin-kernel
  KBUILD_CFLAGS_MODULE	+= -mlong-calls
  
  # Finally dump eveything into kernel build system
  KBUILD_CFLAGS	+= $(cflags-y)
  KBUILD_AFLAGS	+= $(KBUILD_CFLAGS)
  LDFLAGS		+= $(ldflags-y)
  
  head-y		:= arch/arc/kernel/head.o
  
  # See arch/arc/Kbuild for content of core part of the kernel
  core-y		+= arch/arc/
  
  # w/o this dtb won't embed into kernel binary
  core-y		+= arch/arc/boot/dts/
  
  core-$(CONFIG_ARC_PLAT_FPGA_LEGACY)	+= arch/arc/plat-arcfpga/
  core-$(CONFIG_ARC_PLAT_TB10X)		+= arch/arc/plat-tb10x/
  
  drivers-$(CONFIG_OPROFILE)	+= arch/arc/oprofile/
  
  libs-y		+= arch/arc/lib/ $(LIBGCC)
  
  boot		:= arch/arc/boot
  
  #default target for make without any arguements.
  KBUILD_IMAGE	:= bootpImage
  
  all:	$(KBUILD_IMAGE)
  bootpImage: vmlinux
  
  boot_targets += uImage uImage.bin uImage.gz
  
  $(boot_targets): vmlinux
  	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
  
  %.dtb %.dtb.S %.dtb.o: scripts
  	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
  
  dtbs: scripts
  	$(Q)$(MAKE) $(build)=$(boot)/dts dtbs
  
  archclean:
  	$(Q)$(MAKE) $(clean)=$(boot)
  
  # Hacks to enable final link due to absence of link-time branch relexation
  # and gcc choosing optimal(shorter) branches at -O3
  #
  # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
  # However lib/decompress_inflate.o (.init.text) calls
  # zlib_inflate_workspacesize (.text) causing relocation errors.
  # Thus forcing all exten calls in this file to be long calls
  export CFLAGS_decompress_inflate.o = -mmedium-calls
  export CFLAGS_initramfs.o = -mmedium-calls
  ifdef CONFIG_SMP
  export CFLAGS_core.o = -mmedium-calls
  endif