凌阳科技|凌阳|大学计划|凌阳大学计划|unsp.com.cn|sunplus|技术论坛|61板|eCos|redboot 菜鸟请教：编译"Hello eCos world"遇到的问题！

Paolo - 2008-5-13 11:54:00

本人是eCos初学者，刚更新了eCosBuildTool工具包，编译"Hello eCos world"遇到问题如下：
输入make命令，显示为：
make: *** No rule to make target 'output/cyg_user_start.elf' , needed by 'all'.
Stop.
请问这是什么问题呢？该如何解决？请各位高手帮帮忙！
我的eCos库为使用工具包中图形编辑工具默认下生成的库default.ecc。makefile文件INSTALL_DIR路径也相应改为：
INSTALL_DIR=/ecos-f/ls/eCos/default-lib/default_install/
应该没有问题啊。另外以前使用老版工具包时我已成功编译了Hello这个例子，可现在用这个新版的为什么不行了？麻烦各位大虾指导！

edababy - 2008-5-13 15:31:00

修改makefile文档:
把其中关于cyg-user_start.elf和cyg_user_start.o的那两行删掉，
编译hello world时没有cyg_user_start.c这个文件。

Paolo - 2008-5-14 10:48:00

按照所说的，把关于cyg-user_start.elf和cyg_user_start.o的那两行删掉，但依然有问题，make后显示为：
make: Nothing to be done for 'all'.
这次是什么问题呢？望高手能继续指教。谢谢！

云里雾里 - 2008-5-14 12:06:00

能不能把你的makefile文件传上来看看.

Paolo - 2008-5-14 15:57:00

makefile文件：
# Originally written by Jonathan Larmour, Red Hat, Inc.
# Modify by lijian (@Sunnorth) for easy building.
# This file is in the public domain and may be used for any purpose

INSTALL_DIR=/ecos-f/ls/eCos/default-lib/default_install/
OUT_DIR=./output

include $(INSTALL_DIR)/include/pkgconf/ecos.mak

XCC = $(ECOS_COMMAND_PREFIX)gcc
XCXX = $(XCC)
XLD = $(XCC)

CFLAGS = -I$(INSTALL_DIR)/include
CXXFLAGS = $(CFLAGS)
LDFLAGS = -nostartfiles -L$(INSTALL_DIR)/lib -Ttarget.ld

.PHONY: all clean

all: $(OUT_DIR) $(BINFILE) $(OBJFILE)

clean:
@echo Cleaning...
@-rm -f $(OUT_DIR)/*

$(OUT_DIR) :
@-mkdir $(OUT_DIR)

$(OUT_DIR)/%.o: %.c
@echo
@echo "Compiling $@..."
@$(XCC) -c -o $(OUT_DIR)/$*.o $(CFLAGS) $(ECOS_GLOBAL_CFLAGS) $<

$(OUT_DIR)/%.o: %.cxx
@echo
@echo "Compiling $@..."
@$(XCXX) -c -o $(OUT_DIR)/$*.o $(CXXFLAGS) $(ECOS_GLOBAL_CFLAGS) $<

$(OUT_DIR)/%.o: %.C
@echo
@echo "Compiling $@..."
@$(XCXX) -c -o $(OUT_DIR)/$*.o $(CXXFLAGS) $(ECOS_GLOBAL_CFLAGS) $<

$(OUT_DIR)/%.o: %.cc
@echo
@echo "Compiling $@..."
@$(XCXX) -c -o $(OUT_DIR)/$*.o $(CXXFLAGS) $(ECOS_GLOBAL_CFLAGS) $<

$(OUT_DIR)/%: $(OUT_DIR)/%.o
@echo "Generating $@..."
@$(XLD) $(LDFLAGS) $(ECOS_GLOBAL_LDFLAGS) -o $@.elf $@.o

$(OUT_DIR)/%.elf: $(OUT_DIR)/% $(INSTALL_DIR)/lib/libextras.a $(INSTALL_DIR)/lib/libtarget.a
@echo
也希望高手能够给解释一下这些语句都是什么意思。

云里雾里 - 2008-5-15 16:12:00

#呵呵,要加上下边红色部分的两行,没有这两行make时就什么都不做了.所以才显示"make: Nothing to be done for 'all' "

# Originally written by Jonathan Larmour, Red Hat, Inc.
# Modify by lijian (@Sunnorth) for easy building.
# This file is in the public domain and may be used for any purpose
INSTALL_DIR=/ecos-f/ecos-build/Test_Proj/default_install
OUT_DIR=./output

OBJFILE=$(OUT_DIR)/hello.o

BINFILE=$(OUT_DIR)/hello.elf

include $(INSTALL_DIR)/include/pkgconf/ecos.mak
XCC = $(ECOS_COMMAND_PREFIX)gcc
XCXX = $(XCC)
XLD = $(XCC)
CFLAGS = -I$(INSTALL_DIR)/include
CXXFLAGS = $(CFLAGS)
LDFLAGS = -nostartfiles -L$(INSTALL_DIR)/lib -Ttarget.ld
.PHONY: all clean
all: $(OUT_DIR) $(BINFILE) $(OBJFILE)
clean:
@echo Cleaning...
@-rm -f $(OUT_DIR)/*
$(OUT_DIR) :
@-mkdir $(OUT_DIR)
$(OUT_DIR)/%.o: %.c
@echo
@echo "Compiling $@..."
@$(XCC) -c -o $(OUT_DIR)/$*.o $(CFLAGS) $(ECOS_GLOBAL_CFLAGS) $<
$(OUT_DIR)/%.o: %.cxx
@echo
@echo "Compiling $@..."
@$(XCXX) -c -o $(OUT_DIR)/$*.o $(CXXFLAGS) $(ECOS_GLOBAL_CFLAGS) $<
$(OUT_DIR)/%.o: %.C
@echo
@echo "Compiling $@..."
@$(XCXX) -c -o $(OUT_DIR)/$*.o $(CXXFLAGS) $(ECOS_GLOBAL_CFLAGS) $<
$(OUT_DIR)/%.o: %.cc
@echo
@echo "Compiling $@..."
@$(XCXX) -c -o $(OUT_DIR)/$*.o $(CXXFLAGS) $(ECOS_GLOBAL_CFLAGS) $<
$(OUT_DIR)/%: $(OUT_DIR)/%.o
@echo "Generating $@..."
@$(XLD) $(LDFLAGS) $(ECOS_GLOBAL_LDFLAGS) -o $@.elf $@.o
$(OUT_DIR)/%.elf: $(OUT_DIR)/% $(INSTALL_DIR)/lib/libextras.a $(INSTALL_DIR)/lib/libtarget.a
@echo

云里雾里 - 2008-5-15 16:58:00

Makefile说明:

# Originally written by Jonathan Larmour, Red Hat, Inc.
# Modify by lijian (@Sunnorth) for easy building.
# This file is in the public domain and may be used for any purpose

#用eCosconfigtool 编译生成的 eCos库路径
INSTALL_DIR=/ecos-f/ecos-build/Test_Proj/default_install
#输出目录
OUT_DIR=./output
#变量定义
OBJFILE=$(OUT_DIR)/cyg_user_start.o
BINFILE=$(OUT_DIR)/cyg_user_start.elf
# 包含ecos.mak这个文件，它定义了应用程序需要的一些变量和规则
# 比如下边用到的“ECOS_COMMAND_PREFIX”就在ecos.mak上定义，有兴趣可以看看ecos.mak的内容
include $(INSTALL_DIR)/include/pkgconf/ecos.mak
#定义一些变量，并给其赋值，这里是指明编译程序所使用的编译工具为"score-elf-gcc"
XCC = $(ECOS_COMMAND_PREFIX)gcc
XCXX = $(XCC)
XLD = $(XCC)
#用于C C++ 和linker的额外标志，一些参数
CFLAGS = -I$(INSTALL_DIR)/include
CXXFLAGS = $(CFLAGS)
LDFLAGS = -nostartfiles -L$(INSTALL_DIR)/lib -Ttarget.ld
#这句声明 all 和 clean为虚拟目标，而不是文件，如果没有这句make则会当all(或clean)为一个文件而去找这个文件，
#加上".PHONY:"后,make就不会去找all(或clean)这样一个文件了，而上直接找下边这个“all(或clean)”目标
.PHONY: all clean
#作为第一个出现的目标项目，Make会将它作为主要和缺省项目("make"就表示"make all")
#当执行make时，调用$(OUT_DIR)、$(BINFILE)、$(OBJFILE)函数，在OUT_DIR所指定的目
#录下生成BINFILE、OBJFILE所指定的文件
all: $(OUT_DIR) $(BINFILE) $(OBJFILE)
#当执行"make clean"命令时删除 $(OUT_DIR)/目录下的所有文件
clean:
@echo Cleaning...
@-rm -f $(OUT_DIR)/*

#makefile中的函数定义，在makefile中函数和变量的形式相似
$(OUT_DIR) : #执行make时会根据 “all"中的$(OUT_DIR)和OUT_DIR的定义来调用这个函数
@-mkdir $(OUT_DIR)
$(OUT_DIR)/%.o: %.c #执行make时会根据 “all"中的$(OBJFILE)和OBJFILE的定义来调用这个函数
@echo
@echo "Compiling $@..."
@$(XCC) -c -o $(OUT_DIR)/$*.o $(CFLAGS) $(ECOS_GLOBAL_CFLAGS) $<
$(OUT_DIR)/%.o: %.cxx
@echo
@echo "Compiling $@..."
@$(XCXX) -c -o $(OUT_DIR)/$*.o $(CXXFLAGS) $(ECOS_GLOBAL_CFLAGS) $<
$(OUT_DIR)/%.o: %.C
@echo
@echo "Compiling $@..."
@$(XCXX) -c -o $(OUT_DIR)/$*.o $(CXXFLAGS) $(ECOS_GLOBAL_CFLAGS) $<
$(OUT_DIR)/%.o: %.cc
@echo
@echo "Compiling $@..."
@$(XCXX) -c -o $(OUT_DIR)/$*.o $(CXXFLAGS) $(ECOS_GLOBAL_CFLAGS) $<
$(OUT_DIR)/%: $(OUT_DIR)/%.o
@echo "Generating $@..."
@$(XLD) $(LDFLAGS) $(ECOS_GLOBAL_LDFLAGS) -o $@.elf $@.o

#执行make时会根据 “all"中的$(BINFILE)和BINFILE的定义来调用这个函数
$(OUT_DIR)/%.elf: $(OUT_DIR)/% $(INSTALL_DIR)/lib/libextras.a $(INSTALL_DIR)/lib/libtarget.a
@echo

关于makefile的一些详细信息请参考“跟我一起写makefile”：
http://bbs.unsp.com/attachment.aspx?attachmentid=330

凌阳科技大学计划论坛