Mac OS X and environ

[Stephen Norum <snorum@slac.stanford.edu>]

Hello,

I ran into a missing symbol in EPICS base on Mac OS X.  Starting in  
Mac OS X 10.5 (Leopard), shared libraries and bundles don't have  
direct access to environ (man environ).

> Shared libraries and bundles don't have direct access to environ,  
> which is only available to the loader ld(1) when a complete program  
> is being linked. The environment routines can still be used, but if  
> direct access to environ is needed, the _NSGetEnviron() routine,  
> defined in <crt_externs.h>, can be used to retrieve the address of  
> environ at runtime.

http://developer.apple.com/documentation/Darwin/Reference/Manpages/man7/environ.7.html


I copied libCom's osdEnv.c to base/src/libCom/osi/os/Darwin and added  
the following:

/* Starting in Mac OS X 10.5 (Leopard), shared libraries and
 * bundles don't have direct access to environ (man environ).
 *
 * Define environ as (*_NSGetEnviron())
 */
#include <crt_externs.h>
#define environ (*_NSGetEnviron())


Everything seems to work fine with this change and it has been  
committed to the trunk and R3-14-2_branch by Eric Norum.



Stephen