[Bugs] [Bug 1160709] libgfapi: use versioned symbols in libgfapi.so for compatibility

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1160709



--- Comment #8 from Kaleb KEITHLEY <kkeithle at redhat.com> ---
Here's an example of aliases based on the __DARWIN_ALIAS family of macros
defined in <sys/cdefs.h> on OS X.

================  foo.h  ================

extern int
foo (const char *) __asm("_foo$GFAPI_340");

=========================================

================  foo.c  ================

#include <stdio.h>
#include "foo.h"

int
foo (const char *str)
{
    printf ("%\n", str);
}

================  foo.c  ================

==============  driver.c  ===============

#include "foo.h"

int
main (int argc, char **argv)
{
    return foo ("hello");
}

==============  driver.c  ===============

and then

% nm driver.o
...
               U _foo$GFAPI_340
...

% nm foo.o
...
               T _foo$GFAPI_340
...


N.B. OS X still has the old pre-ELF compiler semantics of prefixing symbols
with '_'. E.g. open(), close(), read(), write(), etc., in a nm dump of libc
you'll see the symbols _open, _close, _read, _write, etc.

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