linking .o from another directory with makefile

This is a discussion on linking .o from another directory with makefile within the Linux Programming forums, part of the Platform Specific Boards category; Good evening. I can't link getch.o from /mainop to a makefile in /getanumber Code: make: *** No rule to make ...

  1. #1
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    linking .o from another directory with makefile

    Good evening. I can't link getch.o from /mainop to a makefile in /getanumber

    Code:
    make: *** No rule to make target `getch.o', needed by `maingetanumber'.  Stop.
    Code:
    maingetanumber : getanumber.o getch.o
        gcc -I ../mainop -o maingetanumber getanumber.o getch.o -Wall -pedantic
    
    getanumber.o : getanumber.c
        gcc -I ../headers -c getanumber.c

  2. #2
    Captain Crash brewbuck's Avatar
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    Without seeing your directory structure I can't be sure, but can't you just write this?

    Code:
    maingetanumber : getanumber.o ../mainop/getch.o
        gcc -I ../mainop -o $@ $^ -Wall -pedantic
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

  3. #3
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    Here's the tree:

    Code:
    ├── atof_version
    ├── atof_version.c
    ├── atof_version.c~
    ├── bitwise
    ├── bitwise.c
    ├── bitwise.c~
    ├── calc.h~
    ├── calc.h.gch
    ├── displaygraphics.h
    ├── displaygraphics.h~
    ├── getanumber
    │   ├── getanumber.c
    │   ├── getanumber.c~
    │   ├── getanumber.o
    │   ├── makefile
    │   └── makefile~
    ├── getanumber.c~
    ├── getanumber.h~
    ├── getch.c~
    ├── getop.c~
    ├── headers
    │   ├── calc.h
    │   └── getanumber.h
    ├── histogram_lengthwords.c
    ├── histogram_lengthwords.c~
    ├── longereightychar.c
    ├── macro_swap
    ├── macro_swap.c
    ├── macro_swap.c~
    ├── mainop
    │   ├── getch.c
    │   ├── getch.c~
    │   ├── getch.o
    │   ├── getop.c
    │   ├── getop.c~
    │   ├── getop.o
    │   ├── mainop.c
    │   ├── mainop.c~
    │   ├── mainop.o
    │   ├── makefile
    │   ├── makefile~
    │   ├── Makefile~
    │   ├── simplecalc
    │   ├── stack.c
    │   ├── stack.c~
    │   └── stack.o
    ├── mainop.c~
    ├── op.c~
    ├── stack.c~
    ├── stringindex
    ├── stringindex.c
    ├── stringindex.c~
    ├── str_reverse
    ├── str_reverse.c
    ├── str_reverse.c~
    ├── strtohex
    ├── strtohex.c
    ├── strtohex.c~
    ├── wordperline
    ├── wordperline.c
    └── wordperline.c~

  4. #4
    Programming Wraith GReaper's Avatar
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    Where do you call make from? File names have to be relative to the makefiles position.
    Devoted my life to programming...

  5. #5
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    Quote Originally Posted by GReaper View Post
    Where do you call make from? File names have to be relative to the makefiles position.
    I'm calling make from the getanumber dir.

  6. #6
    Programming Wraith GReaper's Avatar
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    Quote Originally Posted by loaded View Post
    I'm calling make from the getanumber dir.
    So, obviously, getch.o( and everything else not in that directory ), need to be prefixed with the relative or absolute path, eg:
    ../mainop/getch.o
    Devoted my life to programming...

  7. #7
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    Quote Originally Posted by GReaper View Post
    So, obviously, getch.o( and everything else not in that directory ), need to be prefixed with the relative or absolute path, eg:
    ../mainop/getch.o
    Sorry, I didn't understand. You mean I need to include all the .c? but I just need the .o of getch.c since the getanumber.c only use two functions from this source. Hum, the header calc.h declares the functions of getch.c and the others functions that are inside mainop directory. Still, I'd like to compile getch only.

    I tried some variations but it didn't work. gcc -I ../mainop -o maingetanumber getanumber.o -include ../mainop/getch.o -Wall -pedantic

    Code:
     
      maingetanumber : getanumber.o getch.o
        gcc -include ../mainop/getch.o -o maingetanumber getanumber.o -Wall -pedantic
    
    getanumber.o : getanumber.c
        gcc -I ../headers -c getanumber.c
    Code:
     
      maingetanumber : getanumber.o getch.o
         gcc -I ../mainop -o maingetanumber getanumber.o ../mainop/getch.o -Wall -pedantic
     
     getanumber.o : getanumber.c
         gcc -I ../headers -c getanumber.c
    Code:
    gcc -I ../mainop -o maingetanumber getanumber.o -include ../mainop/getch.o -Wall -pedantic

  8. #8
    - - - - - - - - oogabooga's Avatar
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    it didn't work
    That's not much information. Did you get the same error as before?

    Do you need a rule in the makefile for getch.o?
    Code:
    getch.o : getch.c ../headers/calc.h
        gcc -I ../headers -c getch.c
    If getanumber.c includes calc.h then calc.h should also be a dependency for getanumber.c.

    And it might be easier if your makefile was at the top level instead of in mainop.
    The cost of software maintenance increases with the square of the programmer's creativity. - Robert D. Bliss

  9. #9
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    Thank you for your help and sorry I forgot to write main earlier. An error showed me this:

    Code:
    /usr/lib/gcc/x86_64-linux-gnu/4.4.3/../../../../lib/crt1.o: In function `_start':
    (.text+0x20): undefined reference to `main'
    collect2: ld returned 1 exit status
    make: *** [maingetanumber] Error 1
    This code did the trick:

    Code:
    getanumberprog : getanumber.o ../mainop/getch.o maingetanumber.o
        gcc -o progetanumber maingetanumber.o getanumber.o ../mainop/getch.o -Wall -pedantic
    
    maingetanumber.o : maingetanumber.c
        gcc -I ../headers -c maingetanumber.c
    
    getanumber.o : getanumber.c
        gcc -I ../headers -c getanumber.c
    I even didn't need to create another getch.o .
    Last edited by loaded; 06-19-2012 at 10:38 PM.

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