BREW Makefile生成工具功能改进——把中间文件放入独立目录

  BREW自带的Makefile生成工具产生的Makefile，会将中间文件（.o）生成到源代码目录下，这样源代码目录看起来很混乱。但是如果在编译完后删除这些文件，又无法享受到make的只编译改动过的源文件的速度优势。在第二版自己编写的BREW Makefile生成工具里（BMG，BREW Makefile 生成工具的编写），花了些时间解决了这个问题。

 

  目前采用的方式：

 

  .o目标定义为"中间目录/文件名"的形式，例如"objs/foo.c"

  模式规则定义为"objs/%.o : %.c"形式。经试验不能只写成"%.o : %.c",会提示找不到生成目标的规则,可能make的模式匹配规则只是匹配文件名。

  使用GCC生成每个源文件的依赖关系到一个.d文件，再使用sed处理这个文件，给里面的源文件名加上“objs/”前缀

  使用“-include $(OBJS:.o=.d)”命令包含生成的.d文件

  也有其它的更简洁处的处理方式，可参见下面列出的参考文档1

 

  原来使用的是微软的NMake程序，但是它不支持VPATH，编写起来比较麻烦。最后改用GNU Make，但是在Windows上又遇到了路径中斜杠和反斜杠的问题。有的Windows版GNU环境和GNU Make不支持Windows的反斜杠路径表示法，将反斜杠解释成转义反斜杠，导致各种生成失败。现在采用的GNU环境是mingw的msys，GNUWin32的make 3.8.1（Mingw版和cygwin版make目标文件涉及盘符的路径，引号还会解析失败，盘符路径还要写成unix形式）版。除上面的目标文件形式外"objs/foo.c"，均可以使用Windows反斜杠路径。

 

  对于BREW项目，还有一个易错点，elf2mod.x这个GCC链接脚本。当时为了启用编译器优化选项时AEEMod_Load仍能放到mod 0地址处，在链接脚本里写下了这样的语句

"AEEMod*.o"(.text.AEEMod_Load)

  现在.o放到了独立目录，这里也该做修改。例如

"objs/AEEMod*.o"(.text.AEEMod_Load)

 

  下面附上参考资料：

  1.让 GNU Make 把中间文件放到独立目录

  2.GNU Make 下创建目录的问题

3.一个makefile实例

 

TARGET=frame

OBJS=objs/EasyText.o objs/extracter.o objs/graphics.o objs/map.o objs/mapX.o objs/object.o objs/script.o objs/simple_thread.o objs/sprite.o objs/state.o objs/ui.o objs/util.o objs/frame.o objs/AEEAppGen.o objs/AEEModGen.o objs/brew_main.o objs/GCCResolver.o

VPATH=./engine ./game c:/PROGRA~1/BREW31~1.5/sdk/src ./BREW_F~1 $(BMG)

APP_INCLUDES= -I../debug/frame -I./simple_stl -I./engine -I./inc -I$(BREWDIR_3)/inc

DEP_INCLUDES= -I../debug/frame -I./simple_stl -I./engine -I./inc

PRE_DEF=-Dsdf 

 

BREW_HOME      = $(BREWDIR)

BREW_ADDINS    = $(BREWADDINS)

GCC_HOME       = $(GCCHOME)

GCC_LIBPATH    = $(GCCLIBPATH)

 

#-------------------------------------------------------------------------------

# type definitions

#-------------------------------------------------------------------------------

 

EXETYPE=elf

BINARY  =bin

MODULE=mod

 

#-----------------------------------------------------------------------

# Target compile time symbol definitions

#

# Tells the SDK source stuffs that we're building a dynamic app.

#-----------------------------------------------------------------------

 

DYNAPP = -DDYNAMIC_APP

 

#-----------------------------------------------------------------------

# Software tool and environment definitions

#   (PREFIX needs to be set to the location of your gcc cross-compiler

#    and binutils.  STUBTOOL needs to be the path and filename of your

#    copy of makestub)

#-----------------------------------------------------------------------

 

AEESRCPATH = $(BREW_HOME)/src

AEEINCPATH = $(BREW_HOME)/inc

GCC   = $(GCC_HOME)/bin/arm-elf-gcc

GPP   = $(GCC_HOME)/bin/arm-elf-g++

LD   = $(GCC_HOME)/bin/arm-elf-ld

DUMPTOOL   = $(GCC_HOME)/bin/arm-elf-objdump

 

ELF2MODTOOLPATH = $(BREW_ADDINS)/common/bin

ELF2MODTOOL=$(ELF2MODTOOLPATH)/elf2mod.exe

GCCRESOLVEPATH = $(BMG)

#-----------------------------------------------------------------------

# Compiler optimization options

#   -O0 disables compiler optimizations.  Other options probably work as

#     well.  Set to taste.

#-----------------------------------------------------------------------

OPT=-Os

 

#-----------------------------------------------------------------------

# Compiler code generation options

#   Add $(TARG) to the CODE line if you're building a Thumb binary (at

#   the moment, this doesn't work).

#-----------------------------------------------------------------------

END=-mlittle-endian

TARG=-mthumb

CODE=$(END) -fshort-enums -fno-builtin -ffunction-sections -fno-exceptions -fno-unwind-tables -fno-rtti -fshort-wchar

 

#-----------------------------------------------------------------------

# Include file search path options

#   (change this to point to where the BREW SDK headers are located)

#-----------------------------------------------------------------------

 

INC=-I$(AEEINCPATH) -I$(GCC_LIBPATH)/include -I$(GCC_HOME)/arm-elf/include $(APP_INCLUDES)

 

#-----------------------------------------------------------------------

# Library search path options

#   (You can change this to point to where your interworking version of 

#    libgcc.a resides)

#-----------------------------------------------------------------------

LIBDIRS = -L$(GCC_LIBPATH)

 

#-----------------------------------------------------------------------

# Nothing below here (except for the dependencies at the bottom of the

#  file) should need to be changed for a reasonably normal compilation.

#-----------------------------------------------------------------------

 

#-----------------------------------------------------------------------

# Processor architecture options

# Sets the designated target processor for this applet.

# Currently, all BREW phones use the ARM 7t chip

#-----------------------------------------------------------------------

CPU=-mcpu=arm7tdmi

 

#-----------------------------------------------------------------------

# ARM Procedure Call Standard (APCS) options

# -fPIC             sets posititon independent code.  Other option: -fpic

# -mthumb-interwork enables switching between ARM and Thumb code

# -mapcs-frame      runs on systems with the frame ptr. specified in the

# APCS

#-----------------------------------------------------------------------

ROPI=

INTRWK=-mthumb-interwork

APCS=-mapcs-frame $(ROPI) $(INTRWK)

 

#-----------------------------------------------------------------------

# Compiler output options

# -c sets object file output only

#-----------------------------------------------------------------------

OUT=-c

 

#-----------------------------------------------------------------------

# Compiler/assembler debug Options

#   -g is the standard flag to leave debugging information in the

#   object files.

#-----------------------------------------------------------------------

DBG=-g

 

#-----------------------------------------------------------------------

# Linker Options

# -o sets the output filename

#-----------------------------------------------------------------------

LINK_CMD  = -Ttext 0 --emit-relocs -entry AEEMod_Load -o

LIBS=-lc -lgcc

 

#-----------------------------------------------------------------------

# HEXTOOL Options

#-----------------------------------------------------------------------

BINFORMAT = -O binary

 

#-----------------------------------------------------------------------

# Compiler flag definitions

#-----------------------------------------------------------------------

CFLAGS0 =$(OUT) $(DYNAPP) $(CPU) $(APCS) $(CODE) $(DBG)

CFLAGS =$(CFLAGS0) $(OPT) $(PRE_DEF)

 

#-----------------------------------------------------------------------

# Linker flag definitions

#-----------------------------------------------------------------------

LDFLAGS =$(LIBDIRS) --script $(GCCRESOLVEPATH)/elf2mod_objs.x

 

#-----------------------------------------------------------------------

# Default target

#-----------------------------------------------------------------------

default: $(TARGET).$(MODULE)

 

#-----------------------------------------------------------------------

# All target

#-----------------------------------------------------------------------

 

.DELETE_ON_ERROR:

 

all: $(TARGET).$(MODULE)

 

-include $(OBJS:.o=.d)

 

objs/%.o : %.c | objs

@echo ---------------------------------------------------------------

@echo 编译C文件 $<

$(GCC) $(CFLAGS) $(INC) -c $< -o $@

@$(GCC) -MM -isystem$(AEEINCPATH) $(CFLAGS) $(DEP_INCLUDES) $< -o objs/$*.d.tmp

@sed -e 's|.*/.o:|$@:|' objs/$*.d.tmp > objs/$*.d

@rm objs/$*.d.tmp

@echo ---------------------------------------------------------------

 

objs/%.o : %.cpp | objs

@echo ---------------------------------------------------------------

@echo 编译C++文件 $<

$(GPP) $(CFLAGS) $(INC) -c $< -o $@

@$(GPP) -MM -isystem$(AEEINCPATH) $(CFLAGS) $(DEP_INCLUDES) $< -o objs/$*.d.tmp

@sed -e 's|.*/.o:|$@:|' objs/$*.d.tmp > objs/$*.d

@rm objs/$*.d.tmp

@echo ---------------------------------------------------------------

 

objs:

@echo ---------------------------------------------------------------

@echo 建立目标文件目录

@mkdir $@

@echo ---------------------------------------------------------------

#-----------------------------------------------------------------------

# Targets for making the actual binary

#-----------------------------------------------------------------------

 

APP_OBJS = $(OBJS)

 

$(TARGET).$(EXETYPE) :  $(APP_OBJS)

$(LD) $(LINK_CMD) $(TARGET).$(EXETYPE) $(LDFLAGS) /

$(APP_OBJS) $(LIBS) $(LINK_ORDER)

 

$(TARGET).$(MODULE) :   $(TARGET).$(EXETYPE)

$(ELF2MODTOOL) $(TARGET).$(EXETYPE) $(TARGET).$(MODULE)

 

#-----------------------------------------------------------------------

# Cleanup 

#-----------------------------------------------------------------------

 

APP_DEPS = $(OBJS:.o=.d)

 

clean:

del -f $(APP_OBJS) $(APP_DEPS) $(TARGET).$(EXETYPE) $(TARGET).$(MODULE)