makefile.sparc64

本源码是将述嵌入式LINUX驱动程序例程

# This material is inherited from the Linux Makefile: arch/sparc64/Makefile:
#
# Makefile for the architecture dependent flags and dependencies on the
# 64-bit Sparc.
#
# Copyright (C) 1996,1998 David S. Miller ([e-mail])
# Copyright (C) 1998 Jakub Jelinek ([e-mail])


CC		:= $(shell if gcc -m64 -S -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo gcc; else echo sparc64-linux-gcc; fi )

NEW_GCC := $(shell if $(CC) -m64 -mcmodel=medlow -S -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo y; else echo n; fi; )
NEW_GAS := $(shell if $(LD) --version 2>&1 | grep 'elf64_sparc' > /dev/null; then echo y; else echo n; fi)
UNDECLARED_REGS := $(shell if $(CC) -c -x assembler /dev/null -Wa,--help | grep undeclared-regs > /dev/null; then echo y; else echo n; fi; )

export NEW_GCC

ifneq ($(NEW_GAS),y)
AS		= sparc64-linux-as
LD		= sparc64-linux-ld
NM		= sparc64-linux-nm
AR		= sparc64-linux-ar
RANLIB		= sparc64-linux-ranlib
else
AS		:= $(AS) -64
LD		:= $(LD) -m elf64_sparc
endif
ELFTOAOUT	= elftoaout
ifneq ($(UNDECLARED_REGS),y)
CC_UNDECL	=
else
CC_UNDECL	= -Wa,--undeclared-regs
AS		:= $(AS) --undeclared-regs
endif

#
# Uncomment the first CFLAGS if you are doing kgdb source level
# debugging of the kernel to get the proper debugging information.

#CFLAGS := $(CFLAGS) -g -pipe -fcall-used-g5 -fcall-used-g7 
ifneq ($(NEW_GCC),y)
  CFLAGS := $(CFLAGS) -pipe -mno-fpu -mtune=ultrasparc -mmedlow \
	    -ffixed-g4 -fcall-used-g5 -fcall-used-g7 -Wno-sign-compare
else
  CFLAGS := $(CFLAGS) -m64 -pipe -mno-fpu -mcpu=ultrasparc -mcmodel=medlow \
	    -ffixed-g4 -fcall-used-g5 -fcall-used-g7 -Wno-sign-compare \
	    $(CC_UNDECL)
  AFLAGS += -m64 -mcpu=ultrasparc $(CC_UNDECL)
endif

# Uncomment this to get spinlock/rwlock debugging on SMP.
# DEBUG_SPINLOCK = 1

ifdef CONFIG_SMP
  ifdef DEBUG_SPINLOCK
    CFLAGS += -DSPIN_LOCK_DEBUG
    AFLAGS += -DSPIN_LOCK_DEBUG
  endif
endif