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
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 01:43 AM..
 
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esbbcall(9F)						   Kernel Functions for Drivers 					      esbbcall(9F)

NAME
esbbcall - call function when buffer is available SYNOPSIS
#include <sys/stream.h> bufcall_id_t esbbcall(uint_t pri, void (*func)(void *arg), void (arg)); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
pri Priority of allocation request (to be used by allocb(9F) function, called by esbbcall()) func Function to be called when buffer becomes available. arg Argument to func. DESCRIPTION
esbbcall(), like bufcall(9F), serves as a timeout(9F) call of indeterminate length. If esballoc(9F) is unable to allocate a message and data block header to go with its externally supplied data buffer, esbbcall() can be used to schedule the routine func, to be called with the argument arg when a buffer becomes available. func may be a routine that calls esballoc(9F) or it may be another kernel function. RETURN VALUES
On success, a bufcall IDis returned. On failure, 0 is returned. The value returned from a successful call should be saved for possible future use with unbufcall() should it become necessary to cancel the esbbcall() request (as at driver close time). CONTEXT
esbbcall() can be called from user or interrupt context. SEE ALSO
allocb(9F), bufcall(9F), esballoc(9F), timeout(9F), datab(9S), unbufcall(9F) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 18 Feb 98 esbbcall(9F)

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