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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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PMKPC(1)						    BSD General Commands Manual 						  PMKPC(1)

NAME
pmkpc -- Packages metainformation management tool. SYNOPSIS
pmkpc [options] [modules] DESCRIPTION
pmkpc is a tool that gathers metainformation about installed libraries that provide pkg-config data files. It aims to be an alternative to the pkg-config tool. OPTIONS
The options are as follows: --version Display compatibility version relative to pkgconfig. --atleast-pkgconfig-version Check if compatibility version is at least equal or greater than the version provided as an argument. --modversion Display the version of the given library modules using one line for each version. --atleast-version Check if each module version is at least equal or greater than the version provided as an argument. --exact-version Check if each module version is equal to the version provided as an argument. --max-version Check if each module version is at least equal or smaller than the version provided as an argument. --exists Check if given library modules exists. --cflags Display pre-processor and compiler flags for given library modules. Duplicates values are automatically removed. --cflags-only-I Enable output filtering of compiler flags and keep include path. See output filtering section. --cflags-only-other Enable output filtering of compiler flags and keep other flags than include path. See output filtering section. --libs Display linker flags for given library modules. Duplicate values are automatically removed. --libs_only_l Enable output filtering of linker flags and keep library linking flags. See output filtering section. --libs_only_L Enable output filtering of linker flags and keep library path flags. See output filtering section. --libs_only_other Enable output filtering of linker flags and keep other flags than library linking and path flags. See output filtering section. --help Only for compatibility with pkg-config. Refers to this man page. --usage Display usage. --list-all Display all module names and descriptions. The following options have not been implemented yet: --uninstalled --debug --variable --define-variable --print-errors --silence-errors --errors-to-stdout OUTPUT FILTERING
As pkg-config has no standard specifications we determinated its behavior from pkg-config man page. The result is that filtering options can be accumulated. The default behavior is like if all filtering options were enabled. FILES
pmkcfgtool.dat config tool specific data. SEE ALSO
pkg-config(1) HISTORY
Initialy pmk was using pkg-config in a sub shell. Further, internal support was developed to improve the speed of data gathering. While studying the code of pkg-config we discovered some chunks of code that were unsafe (malloc return unchecked, use of strcpy without any check, ...). Knowing that, we decided to try to do a safer implementation and pmkpc was born. AUTHORS
Damien Couderc and Xavier Santolaria. BSD
January 20, 2004 BSD
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