makefile

   1 export topdir =$(shell pwd)
   2 include ./djyos/port/arch.def
   3
   4 #在此列出所有包含源文件的子目录名，子目录的子目录不必列出
   5 subdir = djyos app
   6
   7 #'('和$之间不能有空格
   8 ifeq ($(MAKECMDGOALS),boot_rom) #编译初始化硬件部分，适合仿真器调试
   9     target = boot_rom
  10     op =
  11     dbg = -gdwarf-2 -Dboot
  12 endif
  13
  14 #'('和'$'之间不能有空格
  15 ifeq ($(MAKECMDGOALS),)
  16     target = debug
  17     op =
  18     dbg = -gdwarf-2 -Ddebug
  19 endif
  20
  21 #加载和运行都在ram，但必须有boot_rom支持。先编译boot_rom，再
  22 #编译debug_ram，把boot_rom写入flash后，上电执行，然后用仿真器调入debug_ram.elf调试。
  23 ifeq ($(MAKECMDGOALS),debug)
  24     target = debug
  25     op =
  26     dbg = -gdwarf-2 -Ddebug
  27 endif
  28
  29 #烧录到flash中，运行时内置bootloader把代码cp到ram中运行
  30 #'('和$之间不能有空格
  31 ifeq ($(MAKECMDGOALS),run_inram)
  32     target = run_inram
  33     op =-O2
  34     dbg =
  35 endif
  36
  37 #烧录到flash中，并且直接在flash中运行
  38 #'('和$之间不能有空格
  39 ifeq ($(MAKECMDGOALS),run_inflash)   #加载和运行都在flash
  40     target = run_inflash
  41     op =-O2
  42     dbg =
  43 endif
  44
  45 export target
  46 export CC = arm-elf-gcc
  47 export AS = arm-elf-gcc
  48 export objcopy = arm-elf-objcopy -I elf32-littlearm -O binary
  49 export size = arm-elf-size
  50 export incdir =-I$(topdir)/djyos/include -I$(topdir)/djyos/port/include
  51
  52 export sub_make = @make --no-print-directory
  53 export CFLAGS  = -c -mcpu=$(CPU) -Wall $(dbg) $(op) -nostartfiles -std=gnu99 #-pedantic
  54 export ASFLAGS = -c -mcpu=$(CPU) -Wall $(dbg) $(op)    #-feliminate-dwarf2-dups
  55 export LDFLAGS = -mcpu=$(CPU) -Wall -nostartfiles -lm -lc
  56
  57 debug \
  58 run_inram \
  59 run_inflash \
  60 boot_rom: rm_obj_list $(subdir)     #rm_obj_list $(subdir)的书写顺序不能颠倒
  61         $(sub_make) -f make_ld $(MAKECMDGOALS)
  62
  63 #rom_obj、preload_obj、sysload_obj、critical_obj这几个连接指示用的变量在各子目录
  64 #中生成并保存在ld_obj文件中，这里删除之，以便重新生成该文件
  65 .PHONY: rm_obj_list
  66 rm_obj_list:
  67         rm -f ld_obj_list
  68
  69 #进入各子目录编译，子目录中除编译该目录下的源文件成.o外，还按该目录下各文件的
  70 #加载属性生成ld_obj文件
  71 .PHONY: $(subdir)
  72 $(subdir) :
  73         $(sub_make) -C $@ $(MAKECMDGOALS)
  74
  75 .PHONY: clean
  76 clean:$(subdir)
  77         rm -f *.ld ld_obj_list
  78