Makefile Help

This is a discussion on Makefile Help within the Tech Board forums, part of the Community Boards category; Hello again guys. I would just like to ask for some help regarding the makefile I used for the inttohex ...

  1. #1
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    Makefile Help

    Hello again guys. I would just like to ask for some help regarding the makefile I used for the inttohex program. It would not work and it would just say Missing separator. Stop..

    Hope somebody could help. Here's the makefile:

    Code:
    # makefile for exercise on linked lists, files, searching and sorting
    CC=gcc
    CFLAGS=-g -W -Wall -I.
    OBJECTS=inttohex.o
    HEADERS=
    PROGNAME=inttohex
    
    $(PROGNAME): $(OBJECTS)
            $(CC) $(CFLAGS) $(OBJECTS) -o $(PROGNAME)
    
    inttohex.o: inttohex.c $(HEADERS)
            $(CC) -c $(CFLAGS) -o inttohex.o
    
    
    .PHONY: clean ctags
    
    tags: ctags
    
    ctags:
            ctags -R
    
    clean:
            rm -rf $(OBJECTS) $(PROGNAME)

  2. #2
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    That's because you're using spaces instead of tabs in lines where command has to be executed. For example
    Code:
            $(CC) $(CFLAGS) $(OBJECTS) -o $(PROGNAME)
    must be indented with tab not with 8 spaces.
    Beside this, in the line
    Code:
            $(CC) -c $(CFLAGS) -o inttohex.o
    you are not giving the source file to the compiler, so it cannot compile. Add inttohex.c after -c flag:
    Code:
             $(CC) -c inttohex.c $(CFLAGS) -o inttohex.o
    Maybe there are more errors, that's what I saw immediately.

  3. #3
    Frequently Quite Prolix dwks's Avatar
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    You shouldn't need to pass -r to rm, because I don't think it's going to be passed any directories.

    Also, there is an implicit rule to compile .c files into .o files, so you can just use this:
    Code:
    inttohex.o: inttohex.c $(HEADERS)
    leaving out the "$(CC) -c $(CFLAGS) -o inttohex.o".
    dwk

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  4. #4
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    Moved to Tech Board since it does not directly concern C programming.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
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