src目录下的Rules.make文件给出了编译的一些规则，如下：

#

# This file contains rules which are shared between multiple Makefiles.

#

 

#

# False targets.

#

.PHONY: dummy

 

#

# Special variables which should not be exported

#

unexport EXTRA_ASFLAGS

unexport EXTRA_CFLAGS

ifneq "$(ARCH)" "h8300"

unexport EXTRA_LDFLAGS

endif

unexport EXTRA_ARFLAGS

unexport SUBDIRS

unexport SUB_DIRS

unexport ALL_SUB_DIRS

unexport MOD_SUB_DIRS

unexport O_TARGET

unexport O_OBJS

unexport L_OBJS

unexport M_OBJS

unexport MI_OBJS

unexport ALL_MOBJS

# objects that export symbol tables

unexport OX_OBJS

unexport LX_OBJS

unexport MX_OBJS

unexport MIX_OBJS

unexport SYMTAB_OBJS

 

unexport MOD_LIST_NAME

 

include ../dir.config

include $(SRC_DIR)/arch.config

 

#

# Get things started.

#

first_rule: sub_dirs

       $(MAKE) all_targets

 

#

# Common rules

#

INC_DIR = -I$(SRC_DIR)/cal -I$(SRC_DIR)/xml -I$(SRC_DIR)/serial -I$(SRC_DIR)/packet -I$(SRC_DIR)/fifo -I$(SRC_DIR)/ping -I$(SRC_DIR)/interface -I$(SRC_DIR)/public

 

%.o: %.c

       @echo "Compiling..."

       @echo "$<"

       $(CXX) $(INC_DIR) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<

      

%.o: %.cpp

       @echo "Compiling..."

       @echo "$<" 

       $(CXX) $(INC_DIR) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<

      

# Rule to compile a set of .o files into one .o file

#

 

ifeq (.depend,$(wildcard .depend))

include .depend

else

.depend:       fastdep 

endif

 

ifneq ($(O_TARGET),$(O_OBJS))

$(O_TARGET): .depend $(O_OBJS)

       @echo "Linking..."

       @echo $(O_OBJS) " --> " $@

       @$(LD) $(EXTRA_LDFLAGS) -r -o $@ $(O_OBJS)

else

$(O_TARGET): .depend

endif

#

#

#

 

all:   $(O_OBJS)

       echo all

 

all_targets:  $(O_OBJS) $(O_TARGET)

 

#

 

#

# Rule to compile a set of .o files into one .a file

#

ifdef L_TARGET

$(L_TARGET): $(LX_OBJS) $(L_OBJS)

       rm -f $@

       $(AR) $(EXTRA_ARFLAGS) rcs $@ $(LX_OBJS) $(L_OBJS)

endif

 

#

# This make dependencies quickly

#

fastdep: dummy

       @echo "make fastdep"

       if [ -n "$(wildcard *.[chS])" ]; then \

       $(SCRIPTS_DIR)/mkdep *.[chS] > .depend; fi

       if [ -n "$(wildcard *.cpp)" ]; then \

       $(SCRIPTS_DIR)/mkdep *.cpp >> .depend; fi

 

#

# A rule to make subdirectories

#

sub_dirs: dummy

ifdef SUB_DIRS

       set -e; for i in $(SUB_DIRS); do $(MAKE) -C $$i; done

endif

#

# A rule to do nothing

#

dummy:

 

config:

       cd $(ROOT_DIR); make config

 

c clean:

       rm -f *.o

       rm -f *.gdb

       rm -f .depend

       rm -f test

       rm -f core

       rm -f *.elf

       rm -f *.elf2flt 

 

#

# This is useful for testing

#

script:

       $(SCRIPT)

 

run: test

       @echo ... running ...

       @echo `pwd`/test

       @./test

      

#

# This sets version suffixes on exported symbols

# Uses SYMTAB_OBJS

# Separate the object into "normal" objects and "exporting" objects

# Exporting objects are: all objects that define symbol tables

#

 

 

$(MX_OBJS):

       $(CC) $(CFLAGS) -DEXPORT_SYMTAB -c $(@:.o=.c)

 

$(LX_OBJS) $(OX_OBJS):

       $(CC) $(CFLAGS) -DMODVERSIONS -DEXPORT_SYMTAB -c $(@:.o=.c)

 

$(M_OBJS):

ifdef MAKING_MODULES

$(O_OBJS) $(L_OBJS):

endif

 

 

在config 目录下，编写两个和架构有关的文件，对于x86平台，是arch.i386，如下：

.EXPORT_ALL_VARIABLES:

###################################################################

#

# Vendor specific settings

#

 

CONSOLE_BAUD_RATE = 19200

 

###################################################################

#

# The makefiles need to know how to do things in different contexts

# To save some pain we put it all here

#

# First settings we always want for all build

#

 

# ARCH = kernel,  TARGET_ARCH = uClibc

 

MACHINE       = i386

ARCH          = i386

CROSS_COMPILE =