Аппаратные переменные make

PREFIX  = /path/to/your/cross-compiler/gnu-solaris
TARGET  = powerpc-eabi
 
CC = $(PREFIX)/bin/$(TARGET)-gcc
LD = $(PREFIX)/bin/$(TARGET)-gcc
OBJCOPY = $(PREFIX)/bin/$(TARGET)-objcopy
OBJDUMP = $(PREFIX)/bin/$(TARGET)-objdump
 
#
# Define locations for the text and data code sections. The bss
# gets tacked on to the end of the data by the linker script,
# don't worry about it.
#
 
# define this to move from the default of 0xFFF00000
# IMAGE_TEXT_START = 0xFFC00000
 
# where do you want the text to execute? Define this to move
# from 0x00000000
# TEXT_START = 0x00000000
 
# the data section location defaults to the end of the text section,
# so define these only if you want it in a specific place
# ex. If you're using a real ROM, you need to specify a DATA_START
# that is in RAM so you can actually write to the data space.
#
# IMAGE_DATA_START = 0xFFF40000
# DATA_START = 0x00050000
 
# define options for compilation
# add -gdwarf for debug
# CFLAGS = -gdwarf
 
# define options for linkage. Prevent the inclusion of standard start
# code and libraries.
LDFLAGS = -fno-builtin -nostartfiles -nodefaultlibs -T ld.script
 
ifdef IMAGE_TEXT_START
LDFLAGS += -Wl,--defsym,TEXT_START=$(TEXT_START) \
        -Wl,--defsym,IMAGE_TEXT_START=$(IMAGE_TEXT_START)
endif
 
ifdef IMAGE_DATA_START
 
LDFLAGS += -Wl,--defsym,DATA_START=$(DATA_START) \
        -Wl,--defsym,IMAGE_DATA_START=$(IMAGE_DATA_START)
endif
 
# define options for the objdump
DUMPFLAGS = --syms --disassemble-all
 
# list C modules to link with the init code here
C_SRC = test.c
C_OBJS = $(C_SRC:.c=.o)
 
# use variables to refer to init code in case it changes
PPCINIT = ppcinit.o
PPCINIT_DEP = reg_defs.h ppcinit.h ppcinit.S
 
#
# define build targets
#
 
all: go.srec
 
clean:
    rm *.o *.elf *.srec *.dump *.i
 
# build s-record with init code and c files linked together
go.srec: $(C_OBJS) $(PPCINIT)
    $(LD) $(LDFLAGS) -o go.elf $(PPCINIT) $(C_OBJS)
    $(OBJDUMP) $(DUMPFLAGS) go.elf > go.dump
    $(OBJCOPY) -O srec -R .comment go.elf go.srec
 
# compile init code
$(PPCINIT): $(PPCINIT_DEP)
    $(CC) $(CFLAGS) -c -x assembler-with-cpp $*.S
 
# handle compilation of C files
%.o:%.c
    $(CC) $(CFLAGS) -c $<