Makefile错误信息

Question

我是Stack Overflow的新手。我目前很难解决一个简单的问题。

在我shell/目录中，我有：

CVS/ 
include/ 
Makefile 
obj 
src 

试图直接目标文件时，要建在obj，但会出现我的问题，当我运行make用下面的代码：

# Beginning of Makefile 
OBJS = obj/shutil.o obj/parser.o obj/sshell.o 
HEADER_FILES = include/shell.h include/parser.h 
EXECUTABLE = simpleshell 
CFLAGS = -Wall 
CC = gcc 
# End of configuration options 

#What needs to be built to make all files and dependencies 
all: $(EXECUTABLE) 

#Create the main executable 
$(EXECUTABLE): $(OBJS) 
     $(CC) -o $(EXECUTABLE) $(OBJS) 

#Recursively build object files 
%.o: %.c 
     $(CC) $(CFLAGS) -c -o $@ $< 

#Define dependencies for objects based on header files 
#We are overly conservative here, parser.o should depend on parser.h only 
$(OBJS) : $(HEADER_FILES) 

clean: 
     -rm -f $(EXECUTABLE) obj/*.o 
run: $(EXECUTABLE) 
     ./$(EXECUTABLE) 

tarball: 
     -rm -f $(EXECUTABLE) obj/*.o 
     (cd .. ; tar czf Kevin_Fairchild_a3.tar.z shell) 

# End of Makefile 

我收到此错误：

gcc -o simpleshell obj/shutil.o obj/parser.o obj/sshell.o 
gcc: obj/shutil.o: No such file or directory 
gcc: obj/parser.o: No such file or directory 
gcc: obj/sshell.o: No such file or directory 
gcc: no input files 
make: *** [simpleshell] Error 1 

我错过了什么简单的片段？我将继续研究和了解的Makefile

Answer 1

麻烦的是，该模式规则

%.o: %.c 
    ... 

实际上并不符合你想要做什么。源文件实际上是src/shutil.c，所以这个规则不适合。所有Make看到的是这个规则：

$(OBJS) : $(HEADER_FILES) 

没有命令，所以请做出结论，没有必要的行动。然后它继续执行simpleshell的规则，该规则因为对象不在那里而失败。

试试这个：

obj/%.o: src/%.c 
    $(CC) $(CFLAGS) -c -o $@ $< 

有更复杂的变化，一旦这么多的工作。

Answer 2

补充说，简单的修改，这是我在这里发帖之前最初尝试，即

obj/%.o: src/%.c 

我收到这个错误，所以原本我后虽然是别的东西。

gcc -Wall -c -o obj/shutil.o 
src/shutil.c 
src/shutil.c:14:19: error: shell.h: No such file or directory 
src/shutil.c: In function ‘signal_c_init’: 
src/shutil.c:72: error: ‘waitchildren’ undeclared (first use in this function) 
src/shutil.c:72: error: (Each undeclared identifier is reported only once 
src/shutil.c:72: error: for each function it appears in.) 
src/shutil.c: In function ‘checkbackground’: 
src/shutil.c:90: warning: implicit declaration of function ‘striptrailingchar’ 
src/shutil.c: At top level: 
src/shutil.c:101: warning: conflicting types for ‘striptrailingchar’ 
src/shutil.c:90: note: previous implicit declaration of ‘striptrailingchar’ was here 
make: *** [obj/shutil.o] Error 1` 

感谢您的快速回复！