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compiling makefile - error

This is a discussion on compiling makefile - error within the C Programming forums, part of the General Programming Boards category; hi , I've a problem compiling my makefile. the additional files are enclosed. the error I get: $make ./main gcc ...

  1. #1
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    Feb 2013
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    Cool compiling makefile - error

    hi ,

    I've a problem compiling my makefile.
    the additional files are enclosed.

    the error I get:
    $make ./main
    gcc -ggdb main.c
    /tmp/ccPIxwjP.o: In function `main':
    /home/ilan/Embedded_linux/Lesson-2-Makefiles/lesson-2.1/main.c:6: undefined reference to `func1'
    /home/ilan/Embedded_linux/Lesson-2-Makefiles/lesson-2.1/main.c:7: undefined reference to `func2'
    collect2: error: ld returned 1 exit status
    make: *** [main.o] Error 1
    $


    Code:
    my make file:
    
    main : main.o file1.o file2.o
        gcc -ggdb main.o file1.o file2.o -o gdb-main 
    
    main.o : main.c file1.h file2.h
        gcc -ggdb main.c
    
    file1.o:file1.c file1.h
        gcc -ggdb file1.c
    
    file2.o:file2.c file2.h
        gcc -ggdb file2.c
    
    
    PHONY : clean
    
    clean :
        rm *.o
    thanks
    Ilan
    Attached Files Attached Files

  2. #2
    Stoned Witch Barney McGrew's Avatar
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    ./main isn't a rule in your makefile. You want “make main”.

  3. #3
    and the hat of wrongness Salem's Avatar
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    Code:
    main : main.o file1.o file2.o
        gcc -ggdb main.o file1.o file2.o -o gdb-main
     
    main.o : main.c file1.h file2.h
        gcc -c -ggdb main.c
     
    file1.o:file1.c file1.h
        gcc -c -ggdb file1.c
     
    file2.o:file2.c file2.h
        gcc -c -ggdb file2.c
    Your compiled target should have the same name as your make rule.
    Compiling a .c file to a .o file needs the -c flag.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  4. #4
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    fixed to :
    main : main.o file1.o file2.o
    gcc -ggdb -c main.o file1.o file2.o -o gdb-main

    main.o : main.c file1.h file2.h
    gcc -ggdb -c main.c

    file1.o:file1.c file1.h
    gcc -ggdb -c file1.c

    file2.o:file2.c file2.h
    gcc -ggdb -c file2.c


    PHONY : clean

    clean :
    rm *.o

    the error:

    $make ./main
    gcc -ggdb -c main.c
    gcc -ggdb -c file1.c
    gcc -ggdb -c file2.c
    gcc -ggdb -c main.o file1.o file2.o -o gdb-main
    gcc: warning: main.o: linker input file unused because linking not done
    gcc: warning: file1.o: linker input file unused because linking not done
    gcc: warning: file2.o: linker input file unused because linking not done
    $
    $

  5. #5
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    Take a close look at Salem's post. You only need the -c flag when compiling a .c file into a .o file (the compilation proper phase). You don't need it when combining your .o files into the final executable (the linking phase).
    Code:
    main : main.o file1.o file2.o
    gcc -ggdb -c main.o file1.o file2.o -o gdb-main
    Remove the -c parameter from that one line only.
    Salem likes this.

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