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Full Discussion: Linker errors linking to .a files on OS X
Top Forums Programming Linker errors linking to .a files on OS X Post 302928580 by MarshallBanana on Friday 12th of December 2014 11:36:40 PM
Old 12-13-2014
Linker errors linking to .a files on OS X
Basically my problem is that when I try to compile anything using ./configure && make, it fails because of linker errors. I can reproduce the behavior I'm getting as follows:

I have the two following files

main.c:
Code:
#include <stdio.h>

extern void func(void);

int
main(int argc, char **argv)
{
    printf("Before func\n");
    func();
    return 0;
}

func.c:
Code:
#include <stdio.h>

void
func(void)
{
    printf("In func\n");
}

If I do the commands
Code:
gcc -c func.c
gcc -c main.c
ar rc func.a func.o
gcc -o test main.o func.a

I get the output
Code:
ld: warning: ignoring file func.a, file was built for archive which is not the architecture being linked (x86_64): func.a
Undefined symbols for architecture x86_64:
  "_func", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

Any idea what I should do?
Last edited by MarshallBanana; 12-13-2014 at 12:43 AM..
 

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LEARN ABOUT DEBIAN

fltk-config

fltk-config(1)						      General Commands Manual						    fltk-config(1)

NAME

       fltk-config - script to get information about the installed version of fltk.

SYNOPSIS

       fltk-config  [  --prefix  [=DIR]  ] [ --exec-prefix [=DIR] ] [ --version ] [ --api-version ] [ --use-gl ] [ --use-images ] [ --use-glut ] [
       --cc ] [ --cxx ] [ --cflags ] [ --cxxflags ] [ --ldflags ] [ --ldstaticflags ] [ --libs ] [ -Dname[=value] ] [ -g ] [ --compile program.cxx
       ]

DESCRIPTION

       fltk-config is a utility script that can be used to get information about the current version of FLTK that is installed on the system, what
       compiler and linker options to use when building FLTK-based applications, and to build simple FLTK applications.

       The following options are supported:

       --api-version
	    Displays the current FLTK API version number, e.g. "1.1".

       --cc

       --cxx
	    Displays the C/C++ compiler that was used to compile FLTK.

       --cflags

       --cxxflags
	    Displays the C/C++ compiler options to use when compiling source files that use FLTK.

       --compile program.cxx
	    Compiles the source file program.cxx into program.	This option implies "--post program".

       -g
	    Enables debugging information when compiling with the --compile option.

       --ldflags
	    Displays the linker options to use when linking a FLTK application.

       --ldstaticflags
	    Displays the linker options to use when linking a FLTK application to the static FLTK libraries.

       --libs
	    Displays the full path to the FLTK library files, to be used for dependency checking.

       --use-gl
	    Enables OpenGL support.

       --use-glut
	    Enables GLUT support.

       --use-images
	    Enables image file support.

       --version
	    Displays the current FLTK version number, e.g. "1.1.0".

SEE ALSO

       fluid(1), fltk(3)
       FLTK Programming Manual
       FLTK Web Site, http://www.fltk.org/

AUTHORS

       Bill Spitzak and others.

6 February 2007 						Fast Light Tool Kit						    fltk-config(1)
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