Makefile文件：没有规则，使目标 [英] Makefile: no rule to make target

问题描述

我一直在寻找这个网站的解决方案，并也尝试谷歌有一段时间了，但不知何故，我无法得到它的工作。

I was looking for a solution on this site and also tried google for some time now, but somehow I can't get it to work.

我的来源应该是在src目录和目标文件将在OBJ目录。现在，我尝试创建一个简单的makefie但我要么得到一个错误，没有规则，或者我不能使它工作使用的目录。

My source should be in the src directory and the object files would be in the obj directory. Now I try to create a simple makefie but I either get an error that there is no rule, or I can't make it work to use the directories.

CC = /usr/bin/gcc
CXXFLAGS =  -O2 -g -Wall -fmessage-length=0

SRC:=       nohupshd.cpp \
            task.cpp

OBJ:=       nohupshd.o \
            task.o

OBJDIR:=        obj
SRCDIR:=        src

DEP:=       src/task.h
LIBS:=

TARGET:=    nohupshd

all:    $(TARGET)

$(TARGET):  $(OBJ)
    $(CC) -o $(TARGET) $(OBJ) $(LIBS)

clean:
    rm -f $(OBJ) $(TARGET)

变式1：

$(OBJDIR)/%.o: $(SRCDIR)/%.cpp
    $(CC) -S $(SRCDIR)/$< -o $(OBJDIR)/$@
    $(CC) -c $(SRCDIR)/$< -o $(OBJDIR)/$@

变1A：

%.o: %.cpp
    $(CC) -S $(SRCDIR)/$< -o $(OBJDIR)/$@
    $(CC) -c $(SRCDIR)/$< -o $(OBJDIR)/$@

当我使用这个模式，我总是得到一个错误，没有规则nohupshd.o打造。

When I use this pattern I always get an error that there is no rule for nohupshd.o to build.

变型2：

$(OBJ) : $(OBJDIR)/%.o: $(SRCDIR)/%.cpp
    $(CC) -S $(SRCDIR)/$< -o $(OBJDIR)/$@
    $(CC) -c $(SRCDIR)/$< -o $(OBJDIR)/$@

当我使用这个变量，我可以看到，它试图建立的，但我得到的错误说，文件的.o不适合目标模式。

When I use this variant, I can see that it tries to build, but I get errors saying that "file".o doesn't fit the target pattern.

的另一个问题是$＆下;不给我的信号源名称。据几个网站应该，但我可以在输出中，没有什么看的，所以我怎么能解决这个问题？

Another issue is that "$<" doesn't give me the source name. According to several sites it should, but I can see in the output that there is nothing, so how can I fix this?

更新：

在此期间我的最新版本是这样的：

In the meantime my newest version looks like this:

$(OBJDIR)/$(OBJ) : $(OBJDIR)/%.o : $(SRCDIR)/%.cpp
    $(CC) -S $< -o $(OBJDIR)/`basename $@ .o`.asm
    $(CC) -c $< -o $@

这现在管理编制的第一个objectfile（nohupshd.o），但是当make试图做第二个文件失败再次说：目标task.o不匹配模式

This now manages to compile the first objectfile (nohupshd.o) but when make tries to do the second file it fails again saying: target 'task.o' doesn't match a pattern.

推荐答案

所以最后我发现了如何写这个makefile，为我的错误的exaplanation答案看我标记为正确答案的帖子：

So finally I found the answer on how to write this makefile, for an exaplanation of my mistakes look at the posting I marked as correct answer:

由此产生的Makefile看起来像这样，和我完整性它张贴在这里，包括头文件的依赖关系（去掉ASM的部分，如果你不需要'时间）：

The resulting makefile looks like this, and for completeness I post it here including dependencies for header files (remove the ASM parts if you don't need 'em):

.SUFFIXES:
.SUFFIXES: .o .cpp
.SUFFIXES: .o .d

CC := g++
LNK:= ar
CXXFLAGS =  -O2 -g -Wall -fmessage-length=0

OBJDIR:=        obj
SRCDIR:=        src
HDIR:=      include

INCLUDE_PATHS:= -Iinclude -Iinclude/interfaces -Iinclude/support

CPP_FILES := propertyfile/propertyfile.cpp \
            propertyfile/propertyitem.cpp \
            propertyfile/propertyfactory.cpp

OBJ :=  $(patsubst %.cpp,$(OBJDIR)/%.o, $(CPP_FILES))
SRC :=  $(patsubst %.cpp,$(SRCDIR)/%.o, $(CPP_FILES))
ASM :=      $(patsubst %.cpp, $(OBJDIR)/$*.asm, $(CPP_FILES))

LIBS:=      

TARGET:=    libsupport.a

all:    $(TARGET)

$(TARGET):  $(OBJ)
    @echo "Linking..."
    @$(LNK) rvs $(TARGET) $(OBJ)
    @cp $(TARGET) ../lib
    @cp -r include ..

clean:
    rm -f $(OBJ) $(ASM) $(TARGET)

-include $(patsubst %.cpp,$(OBJDIR)/%.d, $(CPP_FILES))

$(OBJDIR)/%.o: $(SRCDIR)/%.cpp $(OBJDIR)/%.d 
    @mkdir -p `dirname $@`
    $(CC) $(CXXFLAGS) -S $< -o $(OBJDIR)/$*.asm $(INCLUDE_PATHS)
    $(CC) $(CXXFLAGS) -c $< -o $@ $(INCLUDE_PATHS)

$(OBJDIR)/%.d: $(SRCDIR)/%.cpp 
    $(CC) $(CXXFLAGS) -MM -MT $@ -MF $(OBJDIR)/$*.d -c $< $(INCLUDE_PATHS)  

我希望这可以帮助其他用户。我发现所有的例子都是要么简单的极端和独立，并没有列出多个文件规则的一部分，但并没有真正解释它是如何工作的，或非常复杂，我找不到它如何能帮助我。

I hope this helps other user. All examples that I found were either extremly simple and listed multiple files individually and not part of a rule, but didn't really explain how it works, or were so complicated that I couldn't find out how it can help me.

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