On Sat, Apr 09, 2011 at 03:58:11PM +0000, Ned Deily wrote:
> By the way, since you've asked about it before, 
> MACOSX_DEPLOYMENT_TARGET is a standard feature of the Apple gcc 
> tool chain and is used to support builds for multiple versions.  
> See -mmacosx-version-min in the OS X man (1) gcc and 
> http://developer.apple.com/library/mac/#documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html

P.S.:
Thank you for this information. 
You know, we here (and i personally too) don't fiddle around 
with this, because there is no time left over for such things.

We have discovered flags which work (especially hairy for ld(1) 
and dynamic libraries and concurrent installs), wrote a bunch of 
Perl configure scripts which use '$^O eq' and, for performance, 
&$COMPILE_PTF($TCC, $TEXE, 'sysdeps/generic/x86/cnf.cpuid.c'), 
and try to realize the rest with good coding style. 
No '.weak' and other maybe object file format dependend stuff 
around here.

And i just wanted to try Mac OS once, so i bought a MacBook. 
It looks beautiful and fancontrol is automatic and fantastic and 
i try hard to forget that i'm looking at OpenGL and myriads of 
floating-point calculations.

But i was out of this game once i've written an OGG player (there 
was none and no /dev/whatever accessible here), trying AudioUnit 
and CoreAudio, which confirm something in an event handler and 
have forgotten it after that returns.  And then there was a crash 
and i discovered that Mazzoni's Audacity includes comments on this 
crash in the Mac OS sources from a *long* time ago. 
And so i decided that i don't want to do Apple, and lucky me 
i don't need to make money with doing so nonetheless.

And now i think you have the complete picture on that. 
Thanks again.
:)