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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

jocamlmktop

JOCAMLMKTOP(1)						      General Commands Manual						    JOCAMLMKTOP(1)

NAME

       jocamlmktop - Building custom toplevel systems

SYNOPSIS

       jocamlmktop [ -v ] [ -cclib libname ] [ -ccopt option ] [ -custom [ -o exec-file ] [ -I lib-dir ] filename ...

DESCRIPTION

       The jocamlmktop(1) command builds JoCaml toplevels that contain user code preloaded at start-up.  The jocamlmktop(1) command takes as argu-
       ment a set of x.cmo and x.cma files, and links them with the object files that implement the JoCaml  toplevel.	If  the  -custom  flag	is
       given, C object files and libraries (.o and .a files) can also be given on the command line and are linked in the resulting toplevel.

OPTIONS

       The following command-line options are recognized by jocamlmktop(1).

       -v     Print the version number of the compiler.

       -cclib -llibname
	      Pass the -llibname option to the C linker when linking in ``custom runtime'' mode (see the corresponding option for jocamlc(1).

       -ccopt Pass  the  given	option	to  the  C  compiler and linker, when linking in ``custom runtime'' mode. See the corresponding option for
	      jocamlc(1).

       -custom
	      Link in ``custom runtime'' mode. See the corresponding option for jocamlc(1).

       -Idirectory
	      Add the given directory to the list of directories searched for compiled interface files (.cmo and .cma).

       -o exec-file
	      Specify the name of the toplevel file produced by the linker.  The default is is a.out.

SEE ALSO

       jocamlc(1).

																    JOCAMLMKTOP(1)
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